CN108488972B - Control method of cooling tower auxiliary ground source heat pump system optimized according to four states - Google Patents
Control method of cooling tower auxiliary ground source heat pump system optimized according to four states Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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Abstract
The invention discloses a control method of a cooling tower auxiliary ground source heat pump system optimized according to four states, and relates to the technical field of ground source heat pump system control. The method comprises the following four states of control: after the cooling time of the buried pipe system reaches 860 hours, loading a cooling tower connected with the screw type ground source heat pump unit; when the inlet water temperature of the condensation end of the screw type ground source heat pump unit lasts for 5min and exceeds 37 ℃, loading a cooling tower connected with a centrifugal water chilling unit; when the outlet water temperature of the condenser of the screw type ground source heat pump unit lasts for 5min and is lower than 30 ℃, unloading a cooling tower connected with the screw type ground source heat pump unit; and when the water temperature at the outlet of the condenser of the centrifugal water chilling unit is lower than 32 ℃ for 5min, starting a cooling tower connected with the screw type ground source heat pump unit. The invention ensures the cold-heat balance of the soil in the region of the underground system by using the constant temperature control strategy on the basis of the timing control, improves the operation efficiency and the service life of the system, and reduces the energy consumption.
Description
Technical Field
The invention belongs to the technical field of control of ground source heat pump systems, and particularly relates to a control method of a cooling tower auxiliary ground source heat pump system optimized according to four states.
Background
In the ground source heat pump system, the loads in winter and summer are not equal, the heat load of the air conditioner in winter is obviously lower than the cold load of the air conditioner in summer, if the ground source heat pump system of the buried pipe heat exchanger is only used, the phenomenon that the temperature of soil is continuously increased can occur, the cold-heat balance of the soil is seriously influenced, the efficiency of the running ground source heat pump system can also be reduced, and the main way for relieving the main phenomenon is to increase auxiliary heat dissipation equipment so that the whole ground source heat pump system is more perfect. For a parallel cooling tower ground source heat pump system, a cooling tower is connected with a buried pipe system in parallel, and three operation modes of the ground source heat pump system can be realized through regulating and controlling corresponding butterfly valves, namely a cooling tower independent operation mode, a buried pipe independent operation mode and a cooling tower and buried pipe simultaneous operation mode. The cooling tower operates independently mainly when the temperature of soil around the buried pipe continuously rises and needs time to recover and transition seasons, and the independent operation mode of the buried pipe and the simultaneous operation mode of the cooling tower and the buried pipe can preferentially operate mainly in summer. Generally, in an actual project, related workers can reasonably call the three operation modes according to the actual operation condition of the ground source heat pump system, and the effects of high efficiency and energy saving of the whole system are achieved.
At present, the control strategy for the cooling tower mainly has the following three modes:
(1) the constant temperature control mainly takes the temperature of inlet (outlet) water of the ground source heat pump unit as a judgment value for opening and closing the cooling tower, when the temperature is higher than the judgment value, the cooling tower is opened for auxiliary heat dissipation, otherwise, the cooling tower is closed, and the buried pipe system operates independently;
(2) the temperature difference control mainly takes the difference value between the inlet (outlet) temperature of the ground source heat pump unit and the outdoor dry (wet) ball temperature as the judgment value for opening and closing the cooling tower, when the judgment value is higher than the judgment value, the cooling tower is opened for auxiliary heat dissipation, and when the judgment value is lower than the judgment value, the cooling tower is closed;
(3) and timing control, namely calculating the auxiliary heat dissipation time of the cooling tower in one year according to design, and then opening and closing the cooling tower according to the set time.
For temperature control and temperature difference control, mainly because the cooling capacity of the underground heat exchange system can not meet the requirement, the cooling tower is started to carry out auxiliary heat dissipation, the effect of peak regulation is achieved, but the cold and heat balance of the soil can not be ensured; the timing control is simple and easy to implement, and is beneficial to controlling the cold and heat balance of the soil. Therefore, the control method of the cooling tower auxiliary ground source heat pump system optimized according to four states is provided, and the cold-heat balance of soil and the high-efficiency and energy-saving of the system are achieved by using a constant-temperature control strategy on the basis of timing control.
Disclosure of Invention
The invention aims to provide a control method of a cooling tower auxiliary ground source heat pump system optimized according to four states, which comprises the steps of installing an energy meter on a buried pipe water inlet main pipeline in the ground source heat pump system, monitoring heat discharged in summer and heat taken out in winter every year, continuously modifying the control time of a cooling tower in the next year according to the difference value of the heat in summer and the heat in winter, and using a constant temperature control strategy on the basis of timing control, namely obtaining the working time of the cooling tower in the whole year through calculation to enable the cooling tower to operate under the control of constant temperature in a fixed time period.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a control method of a cooling tower auxiliary ground source heat pump system optimized according to four states, which adopts a supervisory host to control the following four states: the first state: after the cooling time of the local buried pipe system reaches 860 hours, loading a cooling tower and a cooling tower circulating water pump which are connected with the screw type ground source heat pump unit, and independently using the cooling tower for cooling operation; and a second state: when the inlet water temperature of the condensation end of the screw type ground source heat pump unit lasts for 5min and exceeds 37 ℃, loading a cooling tower system connected with the centrifugal water chilling unit; and a third state: when the outlet water temperature of the condenser of the screw type ground source heat pump unit lasts for 5min and is lower than 30 ℃, unloading a cooling tower system connected with the screw type ground source heat pump unit; and a fourth state: and when the water temperature at the outlet of the condenser of the centrifugal water chilling unit is lower than 32 ℃ for 5min, starting a cooling tower system connected with the screw type ground source heat pump unit.
Further, the control of the four states is applied to a parallel cooling tower ground source heat pump system with the cooling tower and the buried pipe connected in parallel.
Further, the method for loading the cooling tower connected with the screw type ground source heat pump unit and the cooling tower circulating water pump in the first state comprises the following steps: SS 00: the two screw type ground source heat pump units operate simultaneously; SS 01: closing the screw type ground source heat pump unit: after the cooling time of the buried pipe system reaches 860 hours, the supervision host sends an instruction to stop the screw type ground source heat pump unit; SS 02: closing a screw type ground source side cooling water pump: after the screw type ground source heat pump unit is shut down and three minutes of delay, the corresponding ground source side cooling water pump with the longest running time is shut down; SS 03: closing a cooling water butterfly valve: after the cooling water pump at the ground source side is closed, closing the corresponding cooling water butterfly valve; SS 04: closing the air conditioner freezing water pump: after the cooling water butterfly valve is closed, closing the corresponding air conditioner chilled water pump with the longest operation time; SS 05: closing an air conditioner chilled water butterfly valve: after the air-conditioning chilled water pump is closed, closing a corresponding air-conditioning chilled water butterfly valve; SS 06: and (3) opening a cooling water butterfly valve: after the air-conditioning chilled water butterfly valve is closed, the cooling water electric butterfly valve is opened; SS 07: starting a cooling tower side cooling water pump: after the cooling water butterfly valve is correctly opened, the cooling water pump with the shortest running time at the side of the cooling tower is started; SS 08: closing the ground source side cooling water pump: after a cooling tower side cooling water pump is started, a ground source side cooling water pump corresponding to the screw type ground source heat pump unit is closed; SS 09: closing a cooling water butterfly valve: after the cooling water pump at the ground source side is closed, closing the corresponding cooling water butterfly valve; SS 10: butterfly valve closing the ground source side water collector: after closing the corresponding cooling water butterfly valve, closing the butterfly valve of the water collecting and distributing device on the ground source side; and when the supervision host receives feedback that the butterfly valve of the ground source side water collecting and distributing device is normally closed, the supervision host smoothly completes all steps of opening the cooling tower connected with the screw type ground source heat pump unit, and the cooling tower is independently used for cooling.
Further, the method for loading the cooling tower system connected with the centrifugal water chilling unit in the second state comprises the following steps: s001: and (3) opening a cooling water butterfly valve: when the inlet water temperature of the condensation end of the screw type ground source heat pump unit lasts for 5min and exceeds 37 ℃, the monitoring host sends a command to open a cooling water butterfly valve; s002: starting a side water pump of the cooling tower: after the cooling water butterfly valve is correctly opened, a cooling tower side water pump is started; s003: opening an air conditioner chilled water butterfly valve: after a water pump on the side of the cooling tower is correctly started, an air conditioner chilled water butterfly valve corresponding to the centrifugal water chilling unit is started; s004: starting an air conditioner freezing water pump: after the air-conditioning chilled water butterfly valve is correctly opened, opening the air-conditioning chilled water pump with the shortest accumulated running time; s005: starting a centrifugal water chilling unit: after the air conditioner refrigerating water pump is correctly started, starting a centrifugal water chilling unit; and when the monitoring host receives the feedback of the normal starting of the centrifugal water chilling unit, all steps of loading the cooling tower system connected with the centrifugal water chilling unit are smoothly completed.
Further, the method for unloading the cooling tower system connected with the screw type ground source heat pump unit in the third state comprises the following steps: s01: closing the screw type ground source heat pump unit: when the outlet water temperature of the condenser of the screw type ground source heat pump unit lasts for 5min and is lower than 30 ℃, the supervisory host sends an instruction to stop the screw type ground source heat pump unit; s02: closing the air conditioner freezing water pump: after the screw type ground source heat pump unit is closed and delayed for 3 minutes, closing the corresponding air conditioner refrigeration water pump; s03: closing an air conditioner chilled water butterfly valve: after the air-conditioning chilled water pump, closing a corresponding air-conditioning chilled water butterfly valve; s04: and (3) closing a cooling tower side water pump: after the air conditioner chilled water butterfly valve is closed, closing the corresponding cooling tower side water pump with the longest accumulated running time; s05: closing a cooling water butterfly valve: after the water pump at the side of the cooling tower is closed, closing the corresponding cooling water butterfly valve; and when the monitoring host receives the feedback that the cooling water butterfly valve is normally closed, all the steps of unloading the cooling tower system connected with the screw type ground source heat pump unit are smoothly completed.
Further, in the fourth state, the method for starting the cooling tower system connected with the screw type ground source heat pump unit comprises the following steps: the method comprises the following steps: and (3) opening a cooling water butterfly valve: when the outlet water temperature of the condenser of the centrifugal water chilling unit is lower than 32 ℃ for 5min, the monitoring host sends a command to open a cooling water butterfly valve; step two: starting a side water pump of the cooling tower: after the cooling water butterfly valve is correctly opened, starting a cooling tower side water pump with the shortest accumulated running time; step three: opening an air conditioner chilled water butterfly valve: after a water pump at the side of the cooling tower is correctly started, an air-conditioning chilled water butterfly valve corresponding to the screw type ground source heat pump unit is started; step four: starting an air conditioner freezing water pump: after the air-conditioning chilled water butterfly valve is correctly opened, opening the air-conditioning chilled water pump with the shortest accumulated running time; step five: starting the screw type ground source heat pump unit: after the air conditioner freezing water pump is correctly started, the supervision host sends an instruction to start the screw type ground source heat pump unit; step six: closing the centrifugal water chilling unit: after the screw type ground source heat pump unit is started, the monitoring host sends out an instruction to stop the centrifugal water chilling unit; step seven: closing the air conditioner freezing water pump: after the centrifugal water chilling unit is closed and delayed for 3 minutes, closing the corresponding air conditioner refrigeration water pump; step eight: closing an air conditioner chilled water butterfly valve: after the air-conditioning chilled water pump is closed, closing a corresponding air-conditioning chilled water butterfly valve; step nine: and (3) closing a cooling tower side water pump: after the air conditioner chilled water butterfly valve is closed, closing the corresponding cooling tower side water pump; step ten: closing a cooling water butterfly valve: after the cooling tower side water pump is closed, the cooling water butterfly valve is closed; and when the monitoring host receives the feedback that the cooling water butterfly valve is normally closed, the whole step of starting the cooling tower system connected with the screw type ground source heat pump unit is smoothly completed.
The invention has the following beneficial effects:
the invention monitors the heat discharged in summer and the heat taken out in winter every year by installing an energy meter on the main water inlet pipeline of the buried pipe in the ground source heat pump system, continuously modifies the control time of the cooling tower in the next year according to the difference value of the heat in summer and winter, and uses a constant temperature control strategy on the basis of timing control, namely obtains the working time of the cooling tower in the whole year by calculation, so that the cooling tower runs under the control of constant temperature in a fixed period of time, thereby ensuring the cold-heat balance of the soil in the region of the buried system, improving the running efficiency and the service life of the system and reducing the energy consumption.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a state-control method of the present invention;
FIG. 2 is a flow chart of a state two control method according to the present invention;
FIG. 3 is a flow chart of a state three control method of the present invention;
FIG. 4 is a flow chart of a state four control method of the present invention;
fig. 5 is a schematic structural diagram of a ground source heat pump system of the parallel cooling tower of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention is a control method of a cooling tower auxiliary ground source heat pump system optimized according to four states, the invention is applied to a parallel cooling tower ground source heat pump system with a cooling tower and a buried pipe connected in parallel, the structural schematic diagram of the parallel cooling tower ground source heat pump system is shown in figure 5, and three operation modes of the ground source heat pump system can be realized by adjusting and controlling corresponding butterfly valves, namely a cooling tower independent operation mode, a buried pipe independent operation mode and a cooling tower and buried pipe simultaneous operation mode; the cooling tower operates independently mainly when the temperature of soil around the buried pipe is continuously raised and needs time to recover and transition seasons, and the buried pipe independent operation mode and the cooling tower and buried pipe simultaneous operation mode can preferentially operate mainly in summer; generally, in an actual project, related workers can reasonably call the three operation modes according to the actual operation condition of the ground source heat pump system, and the effects of high efficiency and energy saving of the whole system are achieved. The ground source heat pump system of the parallel cooling tower is used, the cooling tower can independently operate when the outdoor wet bulb temperature is low, the heat of the soil around the buried pipe can have enough dissipation time, and the heat balance of the soil is maintained. Moreover, the soil temperature in the later period of summer is raised to be very high, the required cold load is low at the moment, if the underground pipe system is continuously used, the service life of the underground pipe system is shortened, the integral operation efficiency of the ground source heat pump system is reduced, the optimal effect cannot be achieved, and the problem can be effectively solved by using the independent operation mode of the cooling tower at the moment.
The method comprises the steps of determining the opening mode of a cooling tower to ensure that the heat discharged into soil in summer and winter of the whole ground source heat pump system is equal to the heat taken out, mainly comprising constant temperature control, temperature difference control and timing control on the cooling tower, calculating the time for opening the cooling tower for auxiliary heat dissipation in one year according to design, then opening and closing the cooling tower according to the set time for constant temperature control and temperature difference control, mainly starting the cooling tower for auxiliary heat dissipation when the cooling capacity of an underground heat exchange system does not meet the requirement to achieve the effect of peak regulation, but cannot ensure the cold-heat balance of the soil, ensuring the cold-heat balance of the soil by using the constant temperature control strategy on the basis of the timing control, namely calculating the working time of the cooling tower all year around, and enabling the cooling tower to run under the constant temperature control in a fixed time period, the cold-heat balance of the soil and the high efficiency and energy conservation of the system are achieved, and the annual running time of the cooling tower is calculated by adopting the following formula:
in the formula: cfc-heat pump refrigeration correction factor;
Cfh-heat pump heat supply correction factor;
Qccooling water heat release amount W under the operation of the system under the summer rated working condition;
Qh-the heat absorption capacity, W, of the cooling water in winter when operating at nominal operating conditions;
c1-the specific heat capacity of the circulating fluid, J/(kg. DEG C);
m*-mass flow of the circulating fluid, kg/s;
range-temperature fluctuation Range, deg.C;
EFLHc-equivalent full load time, h, in refrigeration mode;
EFLHhequivalent full load time in heating mode, h.
Wherein, Cfc、CfhSelecting according to the table 1-1, wherein the refrigeration coefficient EER of the ground source heat pump unit is 5.0, and the heat supply coefficient COP is 4.0;
Qcrefrigerating capacity 1365KW, Q of heat-taking pump sethTaking the heating capacity 1410KW of the heat pump unit;
c1specific heat capacity of water taking is 4.2J/(kg DEG C), m*Taking the flow of the circulating water
Range takes a temperature fluctuation amplitude value of 5 ℃;
EFLHcequivalent full load time, EFLH in refrigeration modehThe equivalent full load time in the heating mode is 1200h and 900h respectively.
TABLE 1-1 Heat Pump correction factor
The annual running time of the cooling tower is about 323h, which is calculated by substituting the required data into a formula, starting from 6 months per year, the cooling time of one ground source heat pump unit using the buried pipe system and the running time of two ground source heat pump units simultaneously using the buried pipe system are respectively and automatically recorded by taking the day as a period, the running time of the two ground source heat pump units is converted into the running time of the two ground source heat pump units according to half of the running time of one ground source heat pump unit, and according to the climate of cold winter and hot summer and the working time (7: 30-17: 30) of most of enterprises and public institutions, the air conditioning system runs for 120 days (6 months-9 months) in summer, runs for 90 days (12 months-2 months) in winter and runs for 10 hours every day; in order to ensure the heat balance of soil, the ground source heat pump unit which is cooled by a soil source is preferentially used for refrigeration in summer, the operation is preferentially carried out for 86 days, 10 hours every day, the operation of a cooling tower is 34 days, 10 hours every day, and the use of the cooling tower and a circulating water pump of the cooling tower is stopped after 10 months every year, the invention adopts a supervisory host computer to carry out the following four states of control:
the first state: after the cooling time of the local buried pipe system reaches 860 hours, loading a cooling tower connected with a screw type ground source heat pump unit (RT-2) and a cooling tower circulating water pump, and independently using the cooling tower for cooling operation; and a second state: when the inlet water temperature of the condensation end of the screw type ground source heat pump unit (RT-2) lasts for 5min and exceeds 37 ℃, loading a cooling tower system connected with the centrifugal water chilling unit (RT-3); and a third state: when the outlet water temperature of the condenser of the screw type ground source heat pump unit (RT-2) lasts for 5min and is lower than 30 ℃, unloading a cooling tower system connected with the screw type ground source heat pump unit (RT-2); and a fourth state: and when the water temperature at the outlet of the condenser of the centrifugal water chilling unit (RT-3) is continuously kept for 5min and is lower than 32 ℃, starting a cooling tower system connected with the screw type ground source heat pump unit (RT-2), and circularly reciprocating the processes.
As shown in figure 1, the method for loading the cooling tower connected with the screw type ground source heat pump unit and the cooling tower circulating water pump in the first state comprises the following steps: SS 00: two screw type ground source heat pump units (RT-1 and RT-2) run simultaneously; SS 01: closing the screw type ground source heat pump unit (RT-1): after the cooling time of the buried pipe system reaches 860 hours, the supervision host sends an instruction to stop the screw type ground source heat pump unit (RT-1); SS 02: and (3) turning off screw type ground source side cooling water pumps (PCD-1, PCD-2 and PCD-3): after the screw type ground source heat pump unit (RT-1) is closed and three minutes is delayed, the corresponding ground source side cooling water pump with the longest operation time is closed; SS 03: closing a cooling water butterfly valve: after the cooling water pump at the ground source side is closed, closing the corresponding cooling water butterfly valve; SS 04: and (3) turning off the air conditioner refrigerating water pump (PCH-1, PCH-2 and PCH-3): after the cooling water butterfly valve is closed, closing the corresponding air conditioner chilled water pump with the longest operation time; SS 05: closing an air conditioner chilled water butterfly valve: after the air-conditioning chilled water pump is closed, closing a corresponding air-conditioning chilled water butterfly valve; SS 06: and (3) starting a cooling water butterfly valve (on the CT-1 side of the cooling tower): after the air-conditioning chilled water butterfly valve is closed, the electric butterfly valve of cooling water (on the side of a cooling tower (CT-1)) is opened; SS 07: starting cooling water pumps (PCD-4 and PCD-5) on the side of the cooling tower (CT-1): after the cooling water butterfly valve is correctly opened, the cooling water pump with the shortest running time at the side of the cooling tower (CT-1) is started; SS 08: and (3) turning off the ground source side cooling water pumps (PCD-1, PCD-2 and PCD-3): after a cooling water pump at the side of the cooling tower (CT-1) is started, a ground source side cooling water pump corresponding to the screw type ground source heat pump unit (RT-2) is closed; SS 09: closing a cooling water butterfly valve: after the cooling water pump at the ground source side is closed, closing the corresponding cooling water butterfly valve; SS 10: butterfly valve closing the ground source side water collector: after closing the corresponding cooling water butterfly valve, closing the butterfly valve of the water collecting and distributing device on the ground source side; and when the supervisory host receives feedback that the butterfly valve of the ground source side water collecting and distributing device is normally closed, the supervisory host smoothly completes all steps of opening the cooling tower connected with the screw type ground source heat pump unit (RT-2), and the cooling tower is independently used for cooling.
As shown in fig. 2, the method for loading the cooling tower system connected with the centrifugal chiller in the second state comprises the following steps: s001: and (3) starting a cooling water (cooling tower side CT-2) butterfly valve: when the inlet water temperature of the condensation end of the screw type ground source heat pump unit lasts for 5min and exceeds 37 ℃, the monitoring host sends a command to open a cooling water (CT-2 at the side of the cooling tower) butterfly valve; s002: starting a cooling tower side (CT-2) water pump (PCD-6, PCD-7): after a butterfly valve of cooling water (on the cooling tower side (CT-2)) is correctly opened, a water pump on the cooling tower side (CT-2) is started; s003: opening an air conditioner chilled water butterfly valve: after a water pump at the side of the cooling tower (CT-2) is correctly started, an air-conditioning chilled water butterfly valve corresponding to a centrifugal water chilling unit (RT-3) is started; s004: turning on air conditioner chilled water pumps (PC-1, PC-2): after the air-conditioning chilled water butterfly valve is correctly opened, opening the air-conditioning chilled water pump with the shortest accumulated running time; s005: starting a centrifugal water chilling unit (RT-3): after the air conditioner freezing water pump is correctly started, starting a centrifugal water chilling unit (RT-3); and when the monitoring host receives the feedback of the normal starting of the centrifugal water chilling unit, all steps of loading the cooling tower system connected with the centrifugal water chilling unit are smoothly completed.
As shown in fig. 3, the method for unloading the cooling tower system connected with the screw type ground source heat pump unit in the state three comprises the following steps: s01: closing the screw type ground source heat pump unit (RT-2): when the outlet water temperature of the condenser of the screw type ground source heat pump unit lasts for 5min and is lower than 30 ℃, the supervisory host sends an instruction to stop the screw type ground source heat pump unit (RT-2); s02: closing the air conditioner freezing water pump: after the screw type ground source heat pump unit (RT-2) is closed and delayed for 3 minutes, the corresponding air conditioner refrigeration water pump is closed; s03: closing an air conditioner chilled water butterfly valve: after the air-conditioning chilled water pump, closing a corresponding air-conditioning chilled water butterfly valve; s04: the cooling tower side (CT-1) water pump is turned off: after the air-conditioning chilled water butterfly valve is closed, closing a corresponding cooling tower side (CT-1) water pump with the longest accumulated running time; s05: closing a cooling water butterfly valve: after a water pump at the side (CT-1) of the cooling tower is closed, closing a corresponding cooling water butterfly valve; and when the monitoring host receives the feedback that the cooling water butterfly valve is normally closed, all the steps of unloading the cooling tower system connected with the screw type ground source heat pump unit are smoothly completed.
As shown in fig. 4, in the state four, the method for starting the cooling tower system connected with the screw type ground source heat pump unit comprises the following steps: the method comprises the following steps: and (3) starting a cooling water (cooling tower side CT-1) butterfly valve: when the outlet water temperature of a condenser of a centrifugal water chilling unit (RT-3) lasts for 5min and is lower than 32 ℃, a monitoring host sends a command to open a butterfly valve of cooling water (CT-1 on the side of a cooling tower); step two: starting a cooling tower side (CT-1) water pump (PCD-4, PCD-5): after a cooling water (cooling tower side CT-1) butterfly valve is correctly opened, a cooling tower side (CT-1) water pump with the shortest accumulated running time is started; step three: opening an air conditioner chilled water butterfly valve: after a water pump at the side of a cooling tower (CT-1) is correctly started, an air-conditioning chilled water butterfly valve corresponding to a screw type ground source heat pump unit (RT-2) is started; step four: turning on an air conditioner chilled water pump (PCD-4 or PCD-5): after the air-conditioning chilled water butterfly valve is correctly opened, opening the air-conditioning chilled water pump with the shortest accumulated running time; step five: starting a screw type ground source heat pump unit (RT-2): after the air conditioner freezing water pump is correctly started, the supervision host sends an instruction to start the screw type ground source heat pump unit (RT-2); step six: closing the centrifugal chiller (RT-3): after the screw type ground source heat pump unit (RT-2) is started, the supervision host sends an instruction to stop the centrifugal water chilling unit (RT-3); step seven: turning off air conditioner chilled water pumps (PC-1, PC-2): after the centrifugal water chilling unit (RT-3) is closed and delayed for 3 minutes, closing the corresponding air-conditioning chilled water pump; step eight: closing an air conditioner chilled water butterfly valve: after the air-conditioning chilled water pump is closed, closing a corresponding air-conditioning chilled water butterfly valve; step nine: and (3) turning off cooling tower side (CT-2) water pumps (PCD-6 and PCD-7): after the air-conditioning chilled water butterfly valve is closed, closing a corresponding cooling tower side (CT-2) water pump; step ten: closing a cooling water (cooling tower side CT-2) butterfly valve: after a cooling tower side (CT-2) water pump is closed, a cooling water (cooling tower side CT-2) butterfly valve is closed; and when the monitoring host receives the feedback that the butterfly valve of the cooling water (the cooling tower side CT-2) is normally closed, the whole step of starting the cooling tower system connected with the screw type ground source heat pump unit is smoothly completed.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (2)
1. A control method of a cooling tower auxiliary ground source heat pump system optimized according to four states is characterized in that a supervisory host is adopted to control the following four states:
the first state: after the cooling time of the local buried pipe system reaches 860 hours, loading a cooling tower and a cooling tower circulating water pump which are connected with the screw type ground source heat pump unit, and independently using the cooling tower for cooling operation;
and a second state: when the inlet water temperature of the condensation end of the screw type ground source heat pump unit lasts for 5min and exceeds 37 ℃, loading a cooling tower system connected with the centrifugal water chilling unit;
and a third state: when the outlet water temperature of the condenser of the screw type ground source heat pump unit lasts for 5min and is lower than 30 ℃, unloading a cooling tower system connected with the screw type ground source heat pump unit;
and a fourth state: when the outlet water temperature of the condenser of the centrifugal water chilling unit is lower than 32 ℃ for 5min, a cooling tower system connected with the screw type ground source heat pump unit is started;
the method for loading the cooling tower connected with the screw type ground source heat pump unit and the cooling tower circulating water pump in the first state comprises the following steps:
SS 00: the two screw type ground source heat pump units operate simultaneously;
SS 01: closing the screw type ground source heat pump unit: after the cooling time of the buried pipe system reaches 860 hours, the supervision host sends an instruction to stop the screw type ground source heat pump unit;
SS 02: closing a screw type ground source side cooling water pump: after the screw type ground source heat pump unit is shut down and three minutes of delay, the corresponding ground source side cooling water pump with the longest running time is shut down;
SS 03: closing a cooling water butterfly valve: after the cooling water pump at the ground source side is closed, closing the corresponding cooling water butterfly valve;
SS 04: closing the air conditioner freezing water pump: after the cooling water butterfly valve is closed, closing the corresponding air conditioner chilled water pump with the longest operation time;
SS 05: closing an air conditioner chilled water butterfly valve: after the air-conditioning chilled water pump is closed, closing a corresponding air-conditioning chilled water butterfly valve;
SS 06: and (3) opening a cooling water butterfly valve: after the air conditioner chilled water butterfly valve is closed, the cooling water butterfly valve is opened;
SS 07: starting a cooling tower side cooling water pump: after the cooling water butterfly valve is correctly opened, the cooling water pump with the shortest running time at the side of the cooling tower is started;
SS 08: closing the ground source side cooling water pump: after a cooling tower side cooling water pump is started, a ground source side cooling water pump corresponding to the screw type ground source heat pump unit is closed;
SS 09: closing a cooling water butterfly valve: after the cooling water pump at the ground source side is closed, closing the corresponding cooling water butterfly valve;
SS 10: butterfly valve closing the ground source side water collector: after closing the corresponding cooling water butterfly valve, closing the butterfly valve of the water collecting and distributing device on the ground source side;
when the supervision host receives feedback that the butterfly valve of the ground source side water collecting and distributing device is normally closed, all steps of opening the cooling tower connected with the screw type ground source heat pump unit are smoothly completed, and the cooling tower is independently used for cooling;
the method for loading the cooling tower system connected with the centrifugal water chilling unit in the second state comprises the following steps:
s001: and (3) opening a cooling water butterfly valve: when the inlet water temperature of the condensation end of the screw type ground source heat pump unit lasts for 5min and exceeds 37 ℃, the monitoring host sends a command to open a cooling water butterfly valve;
s002: starting a side water pump of the cooling tower: after the cooling water butterfly valve is correctly opened, a cooling tower side water pump is started;
s003: opening an air conditioner chilled water butterfly valve: after a water pump on the side of the cooling tower is correctly started, an air conditioner chilled water butterfly valve corresponding to the centrifugal water chilling unit is started;
s004: starting an air conditioner freezing water pump: after the air-conditioning chilled water butterfly valve is correctly opened, opening the air-conditioning chilled water pump with the shortest accumulated running time;
s005: starting a centrifugal water chilling unit: after the air conditioner refrigerating water pump is correctly started, starting a centrifugal water chilling unit;
when the supervision host receives the feedback of the normal starting of the centrifugal chiller, all steps of loading the cooling tower system connected with the centrifugal chiller are smoothly completed;
the method for unloading the cooling tower system connected with the screw type ground source heat pump unit in the third state comprises the following steps:
s01: closing the screw type ground source heat pump unit: when the outlet water temperature of the condenser of the screw type ground source heat pump unit lasts for 5min and is lower than 30 ℃, the supervisory host sends an instruction to stop the screw type ground source heat pump unit;
s02: closing the air conditioner freezing water pump: after the screw type ground source heat pump unit is closed and delayed for 3 minutes, closing the corresponding air conditioner refrigeration water pump;
s03: closing an air conditioner chilled water butterfly valve: after the air-conditioning chilled water pump, closing a corresponding air-conditioning chilled water butterfly valve;
s04: and (3) closing a cooling tower side water pump: after the air conditioner chilled water butterfly valve is closed, closing the corresponding cooling tower side water pump with the longest accumulated running time;
s05: closing a cooling water butterfly valve: after the water pump at the side of the cooling tower is closed, closing the corresponding cooling water butterfly valve;
when the monitoring host receives the feedback that the cooling water butterfly valve is normally closed, all steps of unloading the cooling tower system connected with the screw type ground source heat pump unit are smoothly completed;
in the fourth state, the method for starting the cooling tower system connected with the screw type ground source heat pump unit comprises the following steps:
the method comprises the following steps: and (3) opening a cooling water butterfly valve: when the outlet water temperature of the condenser of the centrifugal water chilling unit is lower than 32 ℃ for 5min, the monitoring host sends a command to open a cooling water butterfly valve;
step two: starting a side water pump of the cooling tower: after the cooling water butterfly valve is correctly opened, starting a cooling tower side water pump with the shortest accumulated running time;
step three: opening an air conditioner chilled water butterfly valve: after a water pump at the side of the cooling tower is correctly started, an air-conditioning chilled water butterfly valve corresponding to the screw type ground source heat pump unit is started;
step four: starting an air conditioner freezing water pump: after the air-conditioning chilled water butterfly valve is correctly opened, opening the air-conditioning chilled water pump with the shortest accumulated running time;
step five: starting the screw type ground source heat pump unit: after the air conditioner freezing water pump is correctly started, the supervision host sends an instruction to start the screw type ground source heat pump unit;
step six: closing the centrifugal water chilling unit: after the screw type ground source heat pump unit is started, the monitoring host sends out an instruction to stop the centrifugal water chilling unit;
step seven: closing the air conditioner freezing water pump: after the centrifugal water chilling unit is closed and delayed for 3 minutes, closing the corresponding air conditioner refrigeration water pump;
step eight: closing an air conditioner chilled water butterfly valve: after the air-conditioning chilled water pump is closed, closing a corresponding air-conditioning chilled water butterfly valve;
step nine: and (3) closing a cooling tower side water pump: after the air conditioner chilled water butterfly valve is closed, closing the corresponding cooling tower side water pump;
step ten: closing a cooling water butterfly valve: after the cooling tower side water pump is closed, the cooling water butterfly valve is closed; and when the monitoring host receives the feedback that the cooling water butterfly valve is normally closed, the whole step of starting the cooling tower system connected with the screw type ground source heat pump unit is smoothly completed.
2. The method for controlling the cooling tower auxiliary ground source heat pump system optimized according to the four states of claim 1, wherein the four state control is applied to a parallel cooling tower ground source heat pump system with the cooling tower connected in parallel with the ground pipe.
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| JPH11281203A (en) * | 1998-01-27 | 1999-10-15 | Nkk Corp | Soil heat source heat pump system and its operation method |
| JP2008209042A (en) * | 2007-02-26 | 2008-09-11 | Masahiro Izutsu | Heat pump type air conditioning system, heat pump type hot water supply system, and heat pump type air conditioning-hot water supply integrative system |
| CN201081471Y (en) * | 2007-08-16 | 2008-07-02 | 天津泰达热泵工程技术有限公司 | Optimized control device for cooling tower assisted soil source heat pump cooling system |
| CN201589356U (en) * | 2010-01-14 | 2010-09-22 | 北京依科瑞德地源科技有限责任公司 | Novel GSHP air-conditioning system |
| CN102155829B (en) * | 2011-03-29 | 2013-06-12 | 浙江建设职业技术学院 | Adaptive heat balance control system of ground source heat pump |
| CN202792751U (en) * | 2012-09-27 | 2013-03-13 | 山东中瑞新能源科技有限公司 | Buried pipe and control system of cooling tower ground source heat pump compound system |
| CN205037480U (en) * | 2015-09-24 | 2016-02-17 | 宝莲华新能源技术（上海）有限公司 | Parallelly connected combined -type air conditioning's of earth source heat pump and cooling tower automatic control system |
| CN105135575A (en) * | 2015-09-24 | 2015-12-09 | 宝莲华新能源技术（上海）有限公司 | Automatic control system for ground source heat pump and cooling tower parallel connection combined type air conditioner |
| CN106016532A (en) * | 2016-05-23 | 2016-10-12 | 东南大学 | Ground source heat pump system and starting and stopping control method of cooling towers |
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