CN113465442B - Method and system for determining energy consumption of cooling tower - Google Patents
Method and system for determining energy consumption of cooling tower Download PDFInfo
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- CN113465442B CN113465442B CN202110727730.1A CN202110727730A CN113465442B CN 113465442 B CN113465442 B CN 113465442B CN 202110727730 A CN202110727730 A CN 202110727730A CN 113465442 B CN113465442 B CN 113465442B
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- 238000001816 cooling Methods 0.000 title claims abstract description 443
- 238000005265 energy consumption Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 44
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 189
- 230000017525 heat dissipation Effects 0.000 claims description 30
- 238000004364 calculation method Methods 0.000 claims description 29
- 238000005057 refrigeration Methods 0.000 abstract description 8
- 239000000498 cooling water Substances 0.000 description 14
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- 238000010586 diagram Methods 0.000 description 5
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
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Abstract
The invention relates to the technical field of refrigeration control, in particular to a method and a system for determining energy consumption of a cooling tower, and aims to solve the problems that the energy consumption of a cooling system deviates and an optimal running state cannot be achieved due to the fact that the energy consumption of the cooling tower cannot be accurately calculated. The method for determining the cooling tower acquires the actual running frequency of the fan according to the real-time heat radiation performance utilization rate of the cooling tower, and further acquires the fan shaft power and the fan running efficiency so as to acquire the actual motor power of the cooling tower. According to the invention, the actual operating frequency of the fan of the cooling tower can be obtained according to the real-time heat radiation performance of the cooling tower, the energy consumption of the cooling tower is further accurately calculated, and the cooling system can be accurately controlled according to the energy consumption of the cooling tower, so that the cooling system works in an optimal state.
Description
Technical Field
The invention relates to the technical field of refrigeration control, in particular to a method and a system for determining energy consumption of a cooling tower.
Background
At present, a cold water system is generally adopted in public buildings, and in order to realize more energy-saving and efficient operation of the cold water system, a refrigeration machine room control system usually performs prejudgment calculation of refrigeration operation logic and operation scheme. For example, the refrigerating machine room comprises 4 water chilling units, 4 chilled water pumps, 4 cooling water pumps and 4 cooling towers, and when the load rate is 50%, 3 starting schemes exist: in order to realize the lowest carbon operation, the control system calculates and compares the comprehensive energy consumption of 3 schemes, in the calculation process, the water chilling unit can accurately predict according to the load rate, the chilled water outlet temperature, the cooling water inlet temperature and the like, the chilled water pump and the cooling water pump can accurately predict the water pump energy consumption according to the water flow change, but the cooling tower is influenced by the comprehensive factors such as the operation number, the water flow, the wet bulb temperature, the cooling water inlet and outlet temperature, the fan frequency and the like, and the operation energy consumption cannot be accurately calculated all the time.
The energy consumption of the cooling tower is generally predicted in the industry by adopting a step calculation mode, for example, the wet bulb temperature is more than or equal to 26 ℃ and is operated according to 50Hz, the wet bulb temperature is more than or equal to 22 ℃ and the wet bulb temperature is less than 26 ℃ and is operated according to 40 Hz. However, the calculation mode is influenced by historical experience of manufacturers, and has large energy consumption difference from the actual operation process, so that the energy consumption of the cooling tower cannot be accurately calculated. The water outlet temperature of the cooling tower, the flow of the cooling water pump and the energy consumption of the water chilling unit are further influenced, so that the running energy consumption of the refrigeration machine room is deviated and the optimal running state cannot be achieved.
Accordingly, there is a need in the art for a new cooling tower energy consumption determination scheme to address the above-described problems.
Disclosure of Invention
In order to overcome the defects, namely to solve the problems that the energy consumption of the cooling tower cannot be accurately calculated, so that the energy consumption of the cooling system deviates and the optimal running state cannot be achieved, the invention provides a method and a system for determining the energy consumption of the cooling tower.
In a first aspect, the present invention provides a cooling tower energy consumption determining method applied to a cooling system comprising a cooling tower and a water chiller, the method comprising:
respectively acquiring real-time water flow and maximum water flow of the cooling tower according to the running number and temperature information of the cooling tower in a running state, and acquiring the real-time heat radiation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow;
acquiring the actual operating frequency of a fan of the cooling tower according to the real-time heat radiation performance utilization rate and the maximum operating frequency of the fan of the cooling tower;
Obtaining fan shaft power of the cooling tower according to the real-time heat radiation performance utilization rate and rated motor power of the cooling tower, and obtaining fan operation efficiency of the cooling tower according to the actual fan operation frequency and the maximum fan operation frequency;
acquiring the actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency and the operation number;
and determining the energy consumption of the cooling tower according to the actual motor power.
In one technical scheme of the cooling tower energy consumption determining method, the step of acquiring the real-time water flow of the cooling tower according to the running number and temperature information of the cooling tower in the running state comprises the following steps:
According to the total heat dissipation capacity of the cooling system, the water inlet and outlet temperature difference of the cooling tower and the number of operation stations of the cooling tower, calculating the real-time water flow of the cooling tower according to the following formula:
Wherein q Real time is the real-time water flow of the cooling tower, deltaT But is instead provided with is the water inlet and outlet temperature difference of the cooling tower, and m is the number of the cooling towers;
Q Heat dissipation is the electric power corresponding to the total heat dissipation capacity of the cooling system
Q Heat dissipation ＝Q Cooling capacity +Q Power of ,Q Cooling capacity is the electric power corresponding to the total cooling capacity of the cooling system, and Q Power of is the unit power of the water chilling unit;
and/or
The step of acquiring the maximum water flow of the cooling tower according to the running number and temperature information of the cooling tower in the running state comprises the following steps:
According to the outdoor real-time wet bulb temperature, the water flow and the approximation attenuation coefficient of the cooling tower under the rated working condition, calculating the maximum water flow of the cooling tower according to the following formula:
Wherein q Maximum value is the maximum water flow of the cooling tower, ζ is the approximation attenuation coefficient, which is a constant determined according to the difference between the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower, q is the water flow of the cooling tower under the rated working condition, and T w is the outdoor real-time wet bulb temperature;
and/or
The step of acquiring the real-time heat radiation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow comprises the following steps:
according to the real-time water flow and the maximum water flow, calculating the real-time heat radiation performance utilization rate according to the following formula:
S＝q Real time /q Maximum value
s is the utilization rate of the real-time heat radiation performance of the cooling tower.
In one technical scheme of the cooling tower energy consumption determining method, the step of obtaining the actual operating frequency of the fan of the cooling tower according to the real-time heat dissipation performance utilization rate and the maximum operating frequency of the fan of the cooling tower includes:
according to the real-time heat radiation performance utilization rate and the maximum operating frequency of the fan, calculating the actual operating frequency of the fan according to the following formula:
F＝S×f
wherein F is the actual operating frequency of the fan, and F is the maximum operating frequency of the fan.
In one technical scheme of the cooling tower energy consumption determining method, the step of obtaining the fan shaft power of the cooling tower according to the real-time heat dissipation performance utilization rate and the rated motor power of the cooling tower includes:
According to the real-time heat radiation performance utilization rate, the rated motor power and the motor capacity reserve coefficient of the cooling tower, calculating the fan shaft power of the cooling tower according to the following formula:
Wherein K is fan shaft power of the cooling tower, N is rated motor power of the cooling tower, and alpha is a motor capacity reserve coefficient of the cooling tower;
and/or
The step of obtaining the fan operation efficiency of the cooling tower according to the actual operation frequency of the fan and the maximum operation frequency of the fan comprises the following steps:
According to the actual operating frequency of the fan and the maximum operating frequency of the fan of the cooling tower, calculating the operating efficiency of the fan of the cooling tower according to the following formula:
n＝0.9-(f-F)×0.01
And n is the fan operation efficiency of the cooling tower.
In one technical scheme of the cooling tower energy consumption determining method, the step of obtaining the actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency and the operation number includes:
according to the fan shaft power, the fan operation efficiency and the operation number, calculating the actual motor power of the cooling tower according to the following formula:
Wherein Q Tower column is the actual motor power of the cooling tower.
In a second aspect, the present invention provides a cooling tower energy consumption determination system for use in a cooling system comprising a cooling tower and a chiller, the system comprising:
the cooling tower cooling system comprises a cooling performance utilization rate acquisition module, a cooling performance control module and a cooling performance control module, wherein the cooling performance utilization rate acquisition module is configured to acquire real-time water flow and maximum water flow of a cooling tower according to the number of running cooling towers in a running state and temperature information respectively, and acquire the real-time cooling performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow;
the fan actual operation frequency acquisition module is configured to acquire the fan actual operation frequency of the cooling tower according to the real-time heat radiation performance utilization rate and the maximum fan operation frequency of the cooling tower;
The fan operation efficiency acquisition module is configured to acquire fan shaft power of the cooling tower according to the real-time heat radiation performance utilization rate and rated motor power of the cooling tower, and acquire fan operation efficiency of the cooling tower according to the actual fan operation frequency and the maximum fan operation frequency;
An actual motor power acquisition module configured to acquire an actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency, and the number of operations;
An energy consumption determination module configured to determine an energy consumption of the cooling tower based on the actual motor power.
In one technical scheme of the cooling tower energy consumption determining system, the heat radiation performance utilization rate obtaining module comprises a real-time water flow obtaining unit and/or a maximum water flow obtaining unit and/or a heat radiation performance utilization rate calculating unit:
The real-time water flow obtaining unit is configured to calculate the real-time water flow of the cooling tower according to the total heat dissipation capacity of the cooling system, the water inlet and outlet temperature difference of the cooling tower and the running number of the cooling tower and the following formula:
Wherein q Real time is the real-time water flow of the cooling tower, deltaT But is instead provided with is the water inlet and outlet temperature difference of the cooling tower, and m is the number of the cooling towers;
Q Heat dissipation is the electric power corresponding to the total heat dissipation capacity of the cooling system
Q Heat dissipation ＝Q Cooling capacity +Q Power of ,Q Cooling capacity is the electric power corresponding to the total cooling capacity of the cooling system, and Q Power of is the unit power of the water chilling unit;
The maximum water flow obtaining unit is configured to calculate the maximum water flow of the cooling tower according to the outdoor real-time wet bulb temperature, the water flow of the cooling tower under the rated working condition and the approximation attenuation coefficient and the following formula:
Wherein q Maximum value is the maximum water flow of the cooling tower, ζ is the approximation attenuation coefficient, which is a constant determined according to the difference between the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower, q is the water flow of the cooling tower under the rated working condition, and T w is the outdoor real-time wet bulb temperature;
The heat radiation performance utilization ratio calculating unit is configured to calculate the real-time heat radiation performance utilization ratio according to the real-time water flow and the maximum water flow according to the following formula:
S＝q Real time /q Maximum value
s is the utilization rate of the real-time heat radiation performance of the cooling tower.
In one aspect of the cooling tower energy consumption determining system, the fan actual operation frequency obtaining module is further configured to calculate the fan actual operation frequency according to the following steps:
according to the real-time heat radiation performance utilization rate and the maximum operating frequency of the fan, calculating the actual operating frequency of the fan according to the following formula:
F＝S×f
wherein F is the actual operating frequency of the fan, and F is the maximum operating frequency of the fan.
In one technical scheme of the cooling tower energy consumption determining system, the fan operation efficiency obtaining module comprises a shaft power obtaining unit and/or a fan operation efficiency obtaining unit:
The shaft power obtaining unit is configured to calculate the fan shaft power according to the real-time heat radiation performance utilization ratio, the rated motor power, and a motor capacity reserve coefficient of the cooling tower according to the following formula:
Wherein K is fan shaft power of the cooling tower, N is rated motor power of the cooling tower, and alpha is a motor capacity reserve coefficient of the cooling tower;
The fan operation efficiency obtaining unit is configured to calculate the fan operation efficiency of the cooling tower according to the actual fan operation frequency and the maximum fan operation frequency of the cooling tower according to the following formula:
n＝0.9-(f-F)×0.01
And n is the fan operation efficiency of the cooling tower.
In one aspect of the cooling tower energy consumption determination system, the energy consumption determination module is further configured to obtain the actual motor power of the cooling tower according to the following steps:
according to the fan shaft power, the fan operation efficiency and the operation number, calculating the actual motor power of the cooling tower according to the following formula:
Wherein Q Tower column is the actual motor power of the cooling tower.
The technical scheme provided by the invention has at least one or more of the following beneficial effects:
In the technical scheme of implementing the invention, the real-time water flow and the maximum water flow of the cooling tower are obtained according to the number of operating stations and the temperature information of the cooling tower in an operating state, the real-time heat radiation performance utilization rate of the cooling tower is obtained according to the real-time water flow and the maximum water flow of the cooling tower, the actual fan operating frequency of the cooling tower is obtained according to the real-time heat radiation performance utilization rate and the maximum fan operating frequency of the cooling tower, the fan shaft power of the cooling tower is obtained according to the real-time heat radiation performance utilization rate and the rated motor power of the cooling tower, the fan operating efficiency of the cooling tower is obtained according to the actual fan operating frequency and the maximum fan operating frequency, and the actual motor power of the cooling tower is further obtained according to the fan shaft power, the fan operating efficiency and the number of operating stations of the cooling tower, and the energy consumption of the cooling tower is determined according to the actual motor power of the cooling tower. Based on the steps, the actual running frequency of the fan of the cooling tower can be obtained according to the real-time heat radiation performance of the cooling tower, the energy consumption of the cooling tower is further accurately calculated, and the cooling system can be accurately controlled according to the energy consumption of the cooling tower, so that the cooling system works in an optimal state.
Drawings
The present disclosure will become more readily understood with reference to the accompanying drawings. As will be readily appreciated by those skilled in the art: the drawings are for illustrative purposes only and are not intended to limit the scope of the present invention. Wherein:
FIG. 1 is a schematic flow diagram of the main steps of a cooling tower energy consumption determination method according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a cooling system composition according to one embodiment of the invention;
FIG. 3 is a schematic block diagram of the main structure of a cooling tower energy consumption determination system according to an embodiment of the present invention.
Detailed Description
Some embodiments of the invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, a "module," "processor" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, or software components, such as program code, or a combination of software and hardware. The processor may be a central processor, a microprocessor, a digital signal processor, or any other suitable processor. The processor has data and/or signal processing functions. The processor may be implemented in software, hardware, or a combination of both. Non-transitory computer readable storage media include any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, and the like. The term "a and/or B" means all possible combinations of a and B, such as a alone, B alone or a and B. The term "at least one A or B" or "at least one of A and B" has a meaning similar to "A and/or B" and may include A alone, B alone or A and B. The singular forms "a", "an" and "the" include plural referents.
At present, the cold supply system usually performs prejudgment calculation of operation logic and operation scheme during operation, in order to realize lower-carbon and environment-friendly operation, the energy consumption of alternative operation scheme is generally calculated and compared, and the actual operation scheme is selected according to the result of calculation and comparison. In the process of energy consumption calculation, the water chilling unit can accurately predict according to load rate, chilled water outlet temperature, cooling water inlet temperature and the like, and the chilled water pump and the cooling water pump can accurately predict the energy consumption of the water pump according to water flow change, but the cooling tower is influenced by comprehensive factors such as the number of running stations, water flow, wet bulb temperature, cooling water inlet and outlet temperature, fan frequency and the like, and the operation energy consumption cannot be accurately calculated all the time. Stepped wet bulb temperature calculation methods are commonly used in the industry, such as wet bulb temperature greater than or equal to 26 ℃ and operating at 50Hz, wet bulb temperature greater than or equal to 22 ℃ and less than 26 ℃ and operating at 40 Hz. However, the energy consumption calculation result of the cooling tower obtained by the method is obtained only by experience, and the difference between the energy consumption calculation result and the actual operation is large, so that the operation energy consumption of the whole cooling system deviates and the cooling system cannot operate in the optimal operation state of the cooling system.
In an embodiment of the present invention, a cooling tower energy consumption determining method is provided to solve the above-mentioned problems.
Referring to fig. 1, fig. 1 is a schematic flow chart of main steps of a cooling tower energy consumption determining method according to an embodiment of the present invention. As shown in fig. 1, the cooling tower energy consumption determining method in the embodiment of the invention is applied to a cooling system comprising a cooling tower and a water chiller, as shown in fig. 2, fig. 2 is a schematic diagram of a cooling system according to an embodiment of the invention, wherein the cooling system comprises a cooling tower, a cooling water pump, a magnetic suspension water chiller and a chilled water pump. The magnetic suspension water chilling unit controls water to enter a cooling tower for cooling, cooling water output by the cooling tower enters a cooling water pump, and the cooling water returns to the magnetic suspension water chilling unit through the cooling water pump. Meanwhile, the magnetic suspension water chilling unit also controls water to enter the load side, and the water flowing through the load side is frozen by the chilled water pump and then returns to the magnetic suspension water chilling unit. The cooling tower energy consumption determining method in this embodiment includes the steps of:
step S101: and respectively acquiring real-time water flow and maximum water flow of the cooling tower according to the running number and temperature information of the cooling tower in the running state, and acquiring the real-time heat radiation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow.
In this embodiment, the real-time water flow and the maximum water flow of the cooling tower are obtained according to the number of running cooling towers in the running state and the temperature information, and the real-time heat dissipation performance utilization rate of the cooling tower is further obtained according to the real-time water flow and the maximum water flow of the cooling tower.
Step S102: and acquiring the actual operating frequency of the fan of the cooling tower according to the real-time heat radiation performance utilization rate and the maximum operating frequency of the fan of the cooling tower.
In this embodiment, the actual operating frequency of the fan of the cooling tower is obtained according to the real-time heat dissipation performance utilization rate and the maximum operating frequency of the fan of the cooling tower obtained in step S101.
Step S103: and obtaining the fan shaft power of the cooling tower according to the real-time heat radiation performance utilization rate and the rated motor power of the cooling tower, and obtaining the fan operation efficiency of the cooling tower according to the actual operation frequency of the fan and the maximum operation frequency of the fan.
In this embodiment, the fan shaft power of the cooling tower is obtained according to the implementation heat dissipation performance utilization rate and the rated motor power of the cooling tower obtained in step S101, and the fan operation efficiency of the cooling tower is obtained according to the actual operation frequency of the fan and the maximum operation frequency of the fan obtained in step S102.
Step S104: and obtaining the actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency and the operation number.
In the present embodiment, the actual motor power of the cooling tower is obtained according to the fan shaft power and the fan operation efficiency obtained in step S103 and the number of operation stages of the cooling tower.
Step S105: and determining the energy consumption of the cooling tower according to the actual motor power.
In the present embodiment, the energy consumption of cooling is determined from the actual motor power of the cooling tower obtained in step S104.
Based on the steps S101-S105, the embodiment of the invention obtains the real-time water flow and the maximum water flow of the cooling tower according to the running number and the temperature information of the cooling tower in the running state, obtains the real-time heat radiation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow of the cooling tower, obtains the actual fan running frequency of the cooling tower according to the real-time heat radiation performance utilization rate and the maximum fan running frequency of the cooling tower, obtains the fan shaft power of the cooling tower according to the real-time heat radiation performance utilization rate and the rated motor power of the cooling tower, obtains the fan running efficiency of the cooling tower according to the actual fan running frequency and the maximum fan running frequency, obtains the actual motor power of the cooling tower according to the fan shaft power, the fan running efficiency and the running number of the cooling tower, and determines the energy consumption of the cooling tower according to the actual motor power of the cooling tower. Based on the steps, the actual running frequency of the fan of the cooling tower can be obtained according to the real-time heat radiation performance of the cooling tower, the energy consumption of the cooling tower is further accurately calculated, and the cooling system can be accurately controlled according to the energy consumption of the cooling tower, so that the cooling system works in an optimal state.
The above steps S101 to S104 are further described below.
In one implementation of step S101 according to the embodiment of the present invention, step S101 may include the following steps:
According to the total heat dissipation capacity of the cooling system, the water inlet and outlet temperature difference of the cooling tower and the running number of the cooling tower, calculating the real-time water flow of the cooling tower according to the following formula (1):
The meaning of each parameter in formula (1) is: q Real time is the real-time water flow of the cooling tower, deltaT But is instead provided with is the water inlet and outlet temperature difference of the cooling tower, and m is the number of the cooling towers in operation;
Q Heat dissipation is electric power corresponding to total heat dissipation capacity of the cooling system, Q Heat dissipation ＝Q Cooling capacity +Q Power of ,Q Cooling capacity is electric power corresponding to total heat dissipation capacity of the cooling system, and Q Power of is unit power of the water chilling unit.
In the present embodiment, the electric power (unit: kW) corresponding to the total heat radiation amount of the cooling system is the sum of the electric power (unit: kW) corresponding to the total heat radiation amount of the cooling system and the unit power (unit: kW) of the chiller. And calculating the real-time water flow (unit: m 3/h) of the cooling tower according to the electric power corresponding to the total heat dissipation capacity of the cooling system, the water inlet and outlet temperature difference of the cooling tower and the running number of the cooling tower. As an example, the cooling tower inlet and outlet water temperature difference Δt But is instead provided with =5℃.
In one implementation of step S101 according to the embodiment of the present invention, step S101 may include the following steps:
According to the outdoor real-time wet bulb temperature, the water flow and the approximation degree attenuation coefficient of the cooling tower under the rated working condition, calculating the maximum water flow of the cooling tower according to the following formula (2):
The meaning of each parameter in formula (2) is: q Maximum value is the maximum water flow of the cooling tower, ζ is the approximation attenuation coefficient, which is a constant determined according to the difference between the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower, q is the water flow of the cooling tower under the rated working condition, and T w is the outdoor real-time wet bulb temperature.
In the embodiment, the performance of the cooling tower is changed in real time under the influence of the outdoor real-time wet bulb temperature, the outdoor real-time wet bulb temperature T w (unit:. Degree. C.) is required to be measured in real time, and the maximum water flow (unit: m 3/h) of the cooling tower under the current working condition is calculated according to the water flow q (unit: m 3/h) of the cooling tower under the rated working condition and the approximation degree attenuation coefficient xi. The wet bulb temperature refers to the temperature of a system when the air in the system reaches a saturated state and the system reaches thermal equilibrium because a large amount of water is in contact with limited wet air under an adiabatic condition and the latent heat required by water evaporation is completely derived from sensible heat released by the temperature reduction of the wet air. The approximation degree is the difference value between the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower. The approximation decay coefficient ζ is a constant determined according to a difference between the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower. For example, ζ=1 when the approximation degree is 4 ℃, ζ=0.8 when the approximation degree is 3 ℃, and ζ=1.15 when the approximation degree is 5 ℃.
As an example, the rated operation is an operation in which the temperature of water entering and exiting the cooling tower is 37 ℃/32 ℃ respectively, with T w =28 ℃.
For example, when the outdoor real-time wet bulb temperature T w is 27 ℃, the water inlet and outlet temperature of the cooling tower is 35 ℃/30 ℃, the approximation degree is 3 ℃, the approximation degree coefficient is 0.8, and the water flow rate of the cooling tower under the rated working condition is 100m 3/h, q Maximum value ＝0.8×100×0.9528-27＝76m3/h can be calculated by adopting the formula (2).
In one implementation of step S101 according to the embodiment of the present invention, step S101 may include the following steps:
According to the real-time water flow and the maximum water flow, calculating the utilization rate of the real-time heat radiation performance according to the following formula (3):
S＝q Real time /q Maximum value (3)
s in the formula (3) is the utilization rate of the real-time heat radiation performance of the cooling tower.
In the present embodiment, the real-time heat radiation performance utilization rate S (unit:%) of the cooling tower is calculated from the real-time water flow rate and the maximum water flow rate of the cooling tower. When S is more than 100%, the value of S takes 100%.
In one implementation of step S102 in the embodiment of the present invention, step S102 may include the following steps:
according to the real-time heat radiation performance utilization rate and the maximum operating frequency of the fan, calculating the actual operating frequency of the fan according to the following formula (4):
F＝S×f (4)
the meaning of each parameter in formula (4) is: f is the actual operating frequency of the fan, and F is the maximum operating frequency of the fan.
In the present embodiment, the actual operating frequency (unit: hz) of the blower is calculated from the real-time heat radiation performance utilization rate and the maximum operating frequency of the blower. As an example, the maximum operating frequency of the blower is 50Hz.
In one implementation of step S103 in the embodiment of the present invention, step S103 may include the following steps:
according to the real-time heat radiation performance utilization rate, the rated motor power and the motor capacity reserve coefficient of the cooling tower, calculating the fan shaft power of the cooling tower according to the following formula (5):
The meaning of each parameter in formula (5) is: k is fan shaft power of the cooling tower, N is rated motor power of the cooling tower, and alpha is motor capacity reserve coefficient of the cooling tower;
In this embodiment, when the motor is used, since overload may occur when the fan is operated, the rated motor power is generally higher than the shaft power for safety, and there is redundancy in the rated motor power of the cooling tower, which is generally represented by a motor capacity reserve coefficient α, and a ratio of the rated motor power to the shaft power is the motor capacity reserve coefficient. And calculating the fan shaft power of the cooling tower according to the implementation heat radiation performance utilization rate, the rated motor power and the motor capacity reserve coefficient of the cooling tower. As an example, the motor capacity reserve factor α is 1.1.
In one implementation of step S103 in the embodiment of the present invention, step S103 may include the following steps:
According to the actual operating frequency of the fan and the maximum operating frequency of the fan of the cooling tower, calculating the operating efficiency of the fan of the cooling tower according to the following formula (6):
n＝0.9-(f-F)×0.01 (6)
n in the formula (6) is the fan operation efficiency of the cooling tower.
In the embodiment, the fan operation efficiency of the cooling tower is different under different frequencies according to the fan performance, and the fan operation efficiency (unit:%) can be calculated according to the actual operation frequency of the fan and the maximum operation frequency of the fan.
In one implementation of step S104 of the embodiment of the present invention, step S104 may include the following steps:
according to the fan shaft power, the fan operation efficiency and the operation number, calculating the actual motor power of the cooling tower according to the following formula (7):
Q Tower column in equation (7) is the actual motor power of the cooling tower.
In the present embodiment, the actual motor power (unit: kW) of the cooling tower is calculated from the cooling tower fan shaft power, the fan operation efficiency, and the number of operations.
According to the steps, the energy consumption in different cooling tower operation modes can be calculated.
In one example, the cooling system comprises 4 800RT water chilling units, 4 chilled water pumps, 4 cooling water pumps and 4 cooling towers of 22.5kW, wherein the water flow q of the cooling towers under the rated working condition is 750m 3/h, the water inlet and outlet temperature difference of the cooling towers is controlled according to 5 ℃, the maximum operating frequency of a fan is 50Hz, and the motor capacity reserve coefficient of the cooling towers is 1.1. Wherein 800RT is the meaning of 800 tons; the cold ton, also called freezing ton, is a refrigeration unit, and represents the refrigeration power required by 1 ton of 0 ℃ saturated water to freeze to 0 ℃ ice in 24 hours, and represents the refrigeration capacity of a water chiller.
When the load rate of the cooling system is 50%, the chiller has 3 operation schemes, namely 2, 3 and 4 running schemes, and the calculation is performed only by taking the starting scheme for running the 2 chiller as an example, and the calculation process of the other two operation schemes is similar to the calculation process of the operation scheme for running the 2 chiller, and is not repeated here.
When 2 water chilling units are arranged, the electric power Q Cooling capacity corresponding to the total cooling capacity of the cooling system is 5627kW, the unit power Q Power of of the water chilling unit is 866kW, and the electric power corresponding to the total heat dissipation capacity of the power system is:
Q Heat dissipation ＝Q Cooling capacity +Q Power of ＝5627+866＝6493kW
The minimum water flow rate of the cooling tower is 30% (settable), namely 750 x 0.3=225 m 3/h. At this time, the number of the cooling towers is 2, and the real-time water flow of the cooling towers obtained by calculation according to the formula (1) is as follows:
Q Real time ＝372m3/h when the number of the operation towers is 3, and q Real time ＝279m3/h when the number of the operation towers is 4.
The cooling towers have 3 operating schemes, namely 2 cooling towers, 3 cooling towers and 4 cooling towers, which need to be calculated separately for the 3 schemes, and here the following calculation is performed only by taking the 3 rd cooling tower operating scheme (4 cooling towers are operated) as an example, wherein m=4, q Real time ＝279m3/h. The method for determining the 2 cooling towers and the 3 cooling tower schemes is similar to the method for determining the energy consumption of the 4 cooling tower schemes, and will not be repeated here.
At this time, the outdoor real-time wet bulb temperature is 27 ℃, the cooling tower approximation degree is 3 ℃, and the maximum water flow of a single cooling tower is calculated by adopting a formula (2):
further, the heat radiation performance utilization rate of the cooling tower is calculated by adopting the formula (3):
the actual operating frequency of the fan of the cooling tower is calculated by adopting the formula (4):
F＝S×f＝49％×50＝24.5Hz
The fan shaft power of the cooling tower is calculated by adopting the formula (5):
The fan operation efficiency of the cooling tower is calculated by adopting the formula (6):
n＝0.9-(f-F)×0.01＝0.9-(50-24.5)×0.01＝64.5％
the actual motor power of the cooling tower is calculated by adopting the formula (7):
According to the above calculation method, calculation results of operating 2 cooling towers and operating 3 cooling tower schemes can be obtained, respectively. As shown in table 1, table 1 is the energy consumption calculation result of the cooling tower of the 3 operation schemes of the cooling tower when the 2 water chiller units are operated, and further according to the calculation method, the energy consumption calculation result of the cooling tower when the 3 water chiller units are operated and the 4 water chiller units are operated can be obtained respectively, as shown in table 2 and table 3, table 2 is the energy consumption calculation result of the cooling tower of the 3 operation schemes of the cooling tower when the 3 water chiller units are operated, and table 3 is the energy consumption calculation result of the cooling tower of the 3 operation schemes of the cooling tower when the 4 water chiller units are operated.
Table 1: when 2 water chilling units are operated, the energy consumption calculation results of the cooling towers of 3 operation schemes of the cooling towers
Table 2: when 3 water chilling units are operated, the energy consumption calculation results of the cooling towers of 3 operation schemes of the cooling towers
Table 3: when 4 water chilling units are operated, the energy consumption calculation results of the cooling towers of the 3 operation schemes of the cooling towers
According to the calculation results, under the condition that the load rate of the cooling system is 50%, the optimal energy consumption effect can be achieved by operating 4 cooling towers in all three operation schemes of the water chilling unit. Therefore, according to the calculation result, 4 cooling towers of the cooling system can be controlled to perform variable frequency control, and fine adjustment of the actual operating frequency of a fan of the cooling tower is performed according to the approximation degree, so that the cooling system is operated in an optimal matching state. Further, it can be seen that the decoupling control of the number of running water chilling units and the number of running cooling towers can be realized by applying the cooling tower energy consumption determining method provided by the embodiment of the invention.
It should be noted that, although the foregoing embodiments describe the steps in a specific order, it will be understood by those skilled in the art that, in order to achieve the effects of the present invention, the steps are not necessarily performed in such an order, and may be performed simultaneously (in parallel) or in other orders, and these variations are within the scope of the present invention.
Further, the invention also provides a cooling tower energy consumption determining system.
Referring to fig. 3, fig. 3 is a main block diagram of a cooling tower energy consumption determining system according to an embodiment of the present invention. As shown in fig. 3, in the present embodiment, the cooling tower energy consumption determining system is applied to a cooling system including a cooling tower and a water chiller, and the cooling tower energy consumption determining system may include a heat radiation performance utilization rate obtaining module, a fan actual operation frequency obtaining module, a fan operation efficiency obtaining module, an actual motor power obtaining module, and an energy consumption determining module. The heat radiation performance utilization rate obtaining module may be configured to obtain the real-time water flow and the maximum water flow of the cooling tower according to the number of running cooling towers in the running state and the temperature information, and obtain the real-time heat radiation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow. The fan actual operating frequency acquisition module may be configured to acquire the fan actual operating frequency of the cooling tower based on the real-time heat sink utilization and the fan maximum operating frequency of the cooling tower. The fan operating efficiency obtaining module may be configured to obtain a fan shaft power of the cooling tower according to the real-time heat radiation performance utilization rate and the rated motor power of the cooling tower, and obtain a fan operating efficiency of the cooling tower according to the fan actual operating frequency and the fan maximum operating frequency. The actual motor power acquisition module may be configured to acquire the actual motor power of the cooling tower based on the fan shaft power, the fan operating efficiency, and the number of operating units. The energy consumption determination module may be configured to determine the energy consumption of the cooling tower based on the actual motor power.
In one embodiment, the heat sink utilization acquisition module may include a real-time water flow acquisition unit. The real-time water flow rate obtaining unit may be configured to calculate the real-time water flow rate of the cooling tower according to the method shown in the foregoing formula (1) according to the total heat dissipation capacity of the cooling system, the inlet-outlet water temperature difference of the cooling tower, and the number of operations of the cooling tower.
In one embodiment, the heat sink utilization acquisition module may include a maximum water flow acquisition unit. The maximum water flow obtaining unit may be configured to calculate the maximum water flow of the cooling tower according to the outdoor real-time wet bulb temperature, the water flow of the cooling tower under the rated working condition and the approximation attenuation coefficient, and according to the method shown in the foregoing formula (2).
In one embodiment, the heat radiation performance utilization ratio acquisition module may include a heat radiation performance utilization ratio calculation unit. The heat radiation performance utilization ratio calculating unit may be configured to calculate the real-time heat radiation performance utilization ratio according to the method shown in the foregoing equation (3) from the real-time water flow and the maximum water flow.
In one embodiment, the fan actual operating frequency acquisition module may be further configured to calculate the fan actual operating frequency as follows:
and (3) calculating the actual operating frequency of the fan according to the real-time heat radiation performance utilization rate and the maximum operating frequency of the fan and the method shown in the formula (4).
In one embodiment, the fan operating efficiency acquisition module may include a shaft power acquisition unit. The shaft power obtaining unit may be configured to calculate the fan shaft power according to the method shown in the foregoing equation (5) based on the real-time heat radiation performance utilization, the rated motor power, and the motor capacity reserve coefficient of the cooling tower.
In one embodiment, the fan operation efficiency acquisition module may include a fan operation efficiency acquisition unit. The fan operation efficiency obtaining unit may be configured to calculate the fan operation efficiency of the cooling tower according to the method shown in the foregoing equation (6) based on the actual fan operation frequency and the maximum fan operation frequency of the cooling tower.
In one embodiment, the energy consumption determination module may be further configured to calculate the actual motor power of the cooling tower according to the steps of:
And calculating the actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency and the operation number and the method shown in the formula (7).
The foregoing cooling tower energy consumption determining system is used for executing the embodiment of the cooling tower energy consumption determining method shown in fig. 1, and the technical principles of the two embodiments, the technical problems to be solved and the technical effects to be produced are similar, and those skilled in the art can clearly understand that, for convenience and brevity of description, the specific working process and the related description of the cooling tower energy consumption determining system may refer to the description of the embodiment of the cooling tower energy consumption determining method, and will not be repeated herein.
It will be appreciated by those skilled in the art that the present invention may implement all or part of the above-described methods according to the above-described embodiments, or may be implemented by means of a computer program for instructing relevant hardware, where the computer program may be stored in a computer readable storage medium, and where the computer program may implement the steps of the above-described embodiments of the method when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device, medium, usb disk, removable hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier wave signals, telecommunications signals, software distribution media, and the like capable of carrying the computer program code. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
Further, it should be understood that, since the respective modules are merely set to illustrate the functional units of the apparatus of the present invention, the physical devices corresponding to the modules may be the processor itself, or a part of software in the processor, a part of hardware, or a part of a combination of software and hardware. Accordingly, the number of individual modules in the figures is merely illustrative.
Those skilled in the art will appreciate that the various modules in the apparatus may be adaptively split or combined. Such splitting or combining of specific modules does not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solution after splitting or combining falls within the protection scope of the present invention.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (10)
1. A cooling tower energy consumption determination method, characterized by being applied to a cooling system comprising a cooling tower and a water chiller, the method comprising:
respectively acquiring real-time water flow and maximum water flow of the cooling tower according to the running number and temperature information of the cooling tower in a running state, and acquiring the real-time heat radiation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow;
acquiring the actual operating frequency of a fan of the cooling tower according to the real-time heat radiation performance utilization rate and the maximum operating frequency of the fan of the cooling tower;
Obtaining fan shaft power of the cooling tower according to the real-time heat radiation performance utilization rate and rated motor power of the cooling tower, and obtaining fan operation efficiency of the cooling tower according to the actual fan operation frequency and the maximum fan operation frequency;
acquiring the actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency and the operation number;
determining the energy consumption of the cooling tower according to the actual motor power;
the step of acquiring the real-time water flow of the cooling tower according to the running number and temperature information of the cooling tower in the running state comprises the following steps:
According to the total heat dissipation capacity of the cooling system, the water inlet and outlet temperature difference of the cooling tower and the number of operation stations of the cooling tower, calculating the real-time water flow of the cooling tower according to the following formula:
Wherein q Real time is the real-time water flow of the cooling tower, deltaT But is instead provided with is the water inlet and outlet temperature difference of the cooling tower, and m is the number of the cooling towers;
Q Heat dissipation is the electric power corresponding to the total heat dissipation capacity of the cooling system
Q Heat dissipation ＝Q Cooling capacity +Q Power of ,Q Cooling capacity is the electric power corresponding to the total cooling capacity of the cooling system, and Q Power of is the unit power of the water chilling unit;
And
The step of acquiring the maximum water flow of the cooling tower according to the running number and temperature information of the cooling tower in the running state comprises the following steps:
According to the outdoor real-time wet bulb temperature, the water flow and the approximation attenuation coefficient of the cooling tower under the rated working condition, calculating the maximum water flow of the cooling tower according to the following formula:
Wherein q Maximum value is the maximum water flow of the cooling tower, ζ is the approximation attenuation coefficient, which is a constant determined according to the difference between the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower, q is the water flow of the cooling tower under the rated working condition, and T # is the outdoor real-time wet bulb temperature.
2. The cooling tower energy consumption determining method according to claim 1, wherein,
The step of acquiring the real-time heat radiation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow comprises the following steps:
according to the real-time water flow and the maximum water flow, calculating the real-time heat radiation performance utilization rate according to the following formula:
S＝q Real time /q Maximum value
s is the utilization rate of the real-time heat radiation performance of the cooling tower.
3. The cooling tower energy consumption determination method according to claim 2, wherein the step of obtaining the actual operating frequency of the fan of the cooling tower from the real-time heat radiation performance utilization rate and the maximum operating frequency of the fan of the cooling tower includes:
according to the real-time heat radiation performance utilization rate and the maximum operating frequency of the fan, calculating the actual operating frequency of the fan according to the following formula:
F＝S×f
wherein F is the actual operating frequency of the fan, and F is the maximum operating frequency of the fan.
4. The cooling tower energy consumption determination method according to claim 3, wherein the step of "obtaining the fan shaft power of the cooling tower from the real-time heat radiation performance utilization rate and the rated motor power of the cooling tower" includes:
According to the real-time heat radiation performance utilization rate, the rated motor power and the motor capacity reserve coefficient of the cooling tower, calculating the fan shaft power of the cooling tower according to the following formula:
Wherein K is fan shaft power of the cooling tower, N is rated motor power of the cooling tower, and alpha is a motor capacity reserve coefficient of the cooling tower;
and/or
The step of obtaining the fan operation efficiency of the cooling tower according to the actual operation frequency of the fan and the maximum operation frequency of the fan comprises the following steps:
According to the actual operating frequency of the fan and the maximum operating frequency of the fan of the cooling tower, calculating the operating efficiency of the fan of the cooling tower according to the following formula:
n＝0.9-(f-F)×0.01
And n is the fan operation efficiency of the cooling tower.
5. The cooling tower energy consumption determination method according to claim 4, wherein the step of obtaining the actual motor power of the cooling tower from the fan shaft power, the fan operation efficiency, and the number of operations includes:
according to the fan shaft power, the fan operation efficiency and the operation number, calculating the actual motor power of the cooling tower according to the following formula:
Wherein Q Tower column is the actual motor power of the cooling tower.
6. A cooling tower energy consumption determination system for use in a cooling system comprising a cooling tower and a chiller, the system comprising:
the cooling tower cooling system comprises a cooling performance utilization rate acquisition module, a cooling performance control module and a cooling performance control module, wherein the cooling performance utilization rate acquisition module is configured to acquire real-time water flow and maximum water flow of a cooling tower according to the number of running cooling towers in a running state and temperature information respectively, and acquire the real-time cooling performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow;
the fan actual operation frequency acquisition module is configured to acquire the fan actual operation frequency of the cooling tower according to the real-time heat radiation performance utilization rate and the maximum fan operation frequency of the cooling tower;
The fan operation efficiency acquisition module is configured to acquire fan shaft power of the cooling tower according to the real-time heat radiation performance utilization rate and rated motor power of the cooling tower, and acquire fan operation efficiency of the cooling tower according to the actual fan operation frequency and the maximum fan operation frequency;
An actual motor power acquisition module configured to acquire an actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency, and the number of operations;
An energy consumption determination module configured to determine an energy consumption of the cooling tower based on the actual motor power;
the heat radiation performance utilization rate acquisition module comprises a real-time water flow acquisition unit, a maximum water flow acquisition unit and a heat radiation performance utilization rate calculation unit:
The real-time water flow obtaining unit is configured to calculate the real-time water flow of the cooling tower according to the total heat dissipation capacity of the cooling system, the water inlet and outlet temperature difference of the cooling tower and the running number of the cooling tower and the following formula:
Wherein q Real time is the real-time water flow of the cooling tower, deltaT But is instead provided with is the water inlet and outlet temperature difference of the cooling tower, and m is the number of the cooling towers;
Q Heat dissipation is the electric power corresponding to the total heat dissipation capacity of the cooling system
Q Heat dissipation ＝Q Cooling capacity +Q Power of ,Q Cooling capacity is the electric power corresponding to the total cooling capacity of the cooling system, and Q Power of is the unit power of the water chilling unit;
The maximum water flow obtaining unit is configured to calculate the maximum water flow of the cooling tower according to the outdoor real-time wet bulb temperature, the water flow of the cooling tower under the rated working condition and the approximation attenuation coefficient and the following formula:
Wherein q Maximum value is the maximum water flow of the cooling tower, ζ is the approximation attenuation coefficient, which is a constant determined according to the difference between the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower, q is the water flow of the cooling tower under the rated working condition, and T # is the outdoor real-time wet bulb temperature.
7. The cooling tower energy consumption determination system according to claim 6, wherein,
The heat radiation performance utilization ratio calculating unit is configured to calculate the real-time heat radiation performance utilization ratio according to the real-time water flow and the maximum water flow according to the following formula:
S＝q Real time /q Maximum value
s is the utilization rate of the real-time heat radiation performance of the cooling tower.
8. The cooling tower energy consumption determination system of claim 7, wherein the fan actual operating frequency acquisition module is further configured to calculate the fan actual operating frequency as follows:
according to the real-time heat radiation performance utilization rate and the maximum operating frequency of the fan, calculating the actual operating frequency of the fan according to the following formula:
F＝S×f
wherein F is the actual operating frequency of the fan, and F is the maximum operating frequency of the fan.
9. The cooling tower energy consumption determination system of claim 8, wherein the fan operating efficiency acquisition module comprises a shaft power acquisition unit and/or a fan operating efficiency acquisition unit:
The shaft power obtaining unit is configured to calculate the fan shaft power according to the real-time heat radiation performance utilization ratio, the rated motor power, and a motor capacity reserve coefficient of the cooling tower according to the following formula:
Wherein K is fan shaft power of the cooling tower, N is rated motor power of the cooling tower, and alpha is a motor capacity reserve coefficient of the cooling tower;
The fan operation efficiency obtaining unit is configured to calculate the fan operation efficiency of the cooling tower according to the actual fan operation frequency and the maximum fan operation frequency of the cooling tower according to the following formula:
n＝0.9-(f-F)×0.01
And n is the fan operation efficiency of the cooling tower.
10. The cooling tower energy consumption determination system of claim 9, wherein the energy consumption determination module is further configured to obtain the actual motor power of the cooling tower according to the steps of:
according to the fan shaft power, the fan operation efficiency and the operation number, calculating the actual motor power of the cooling tower according to the following formula:
Wherein Q Tower column is the actual motor power of the cooling tower.
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