CN107062550A - A kind of water chilling unit control method - Google Patents
A kind of water chilling unit control method Download PDFInfo
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- CN107062550A CN107062550A CN201710279889.5A CN201710279889A CN107062550A CN 107062550 A CN107062550 A CN 107062550A CN 201710279889 A CN201710279889 A CN 201710279889A CN 107062550 A CN107062550 A CN 107062550A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 129
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000001816 cooling Methods 0.000 claims abstract description 98
- 238000005057 refrigeration Methods 0.000 claims abstract description 67
- 230000009466 transformation Effects 0.000 claims description 21
- 230000009467 reduction Effects 0.000 claims description 14
- 238000009833 condensation Methods 0.000 claims description 8
- 230000005494 condensation Effects 0.000 claims description 8
- 238000004134 energy conservation Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 8
- 239000003507 refrigerant Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
-
- 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
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Air Conditioning Control Device (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a kind of water chilling unit control method, in Tewo ＞ TewodUnit starting up during+Td, selects the operational mode entered：As Tao ＞ TewodK1 and during compressor fault-free, unit enters refrigeration mode；Work as Taod≤ Tao ＜ TewodK1 and during compressor fault-free, unit enters refrigeration plus natural cooling pattern；As Tao≤TaodK2 or during faulty compressor, unit enters complete natural cooling pattern；Therefore, the water chilling unit control method of the present invention, judged by the relation to leaving water temperature Tewo, environment temperature Tao, return difference temperature Td, select the operational mode entered, so that the control of unit is more accurate, fluctuating temperature is smaller, makes full use of natural cooling, requirement of the user to water temperature is met while energy-conservation, user experience is improved.
Description
Technical field
It is to be related to a kind of water chilling unit control method specifically the invention belongs to air-conditioning technical field.
Background technology
The natural type of cooling is widely used in air conditioner refrigerating technically because it saves and cleaned, and is particularly needing
On the air-conditioning of year round cooling, it is more widely applied.
The air-cooled natural cooling unit existed currently on the market, relies primarily on single ambient temperature conditions selection operation mould
, there is the problem of control is not accurate in formula, progress patten transformation, and also not high to the utilization rate in natural cooling water route, it is impossible to reach
More preferable energy-saving effect.
The content of the invention
The invention provides a kind of water chilling unit control method, control is accurate, fluctuating temperature is small.
In order to solve the above technical problems, the present invention is achieved using following technical proposals：
A kind of water chilling unit control method, the handpiece Water Chilling Units include compressor, condenser, condensation fan, evaporator, are arranged on
Natural cooling coil pipe, water inlet pipe, the outlet pipe of condenser side；The water inlet pipe connects the evaporator by the first control valve
Water inlet；The water inlet pipe connects the water inlet of the natural cooling coil pipe, the natural cooling disk by the second control valve
The delivery port of pipe connects the water inlet of the evaporator；The delivery port connection outlet pipe of the evaporator；
The control method includes：
Obtain the leaving water temperature Tewo of evaporator water outlet；
In Tewo ＞ TewodDuring+Td, unit starting up selects operational mode：
As Tao ＞ Tewod- K1 and during compressor fault-free, unit enters refrigeration mode：First control valve is opened, the second control
Valve closing, compressor operating, fan operation；
Work as Taod≤ Tao ＜ Tewod- K1 and during compressor fault-free, unit enters refrigeration plus natural cooling pattern：First control
Valve closing processed, the second control valve unlatching, compressor operating, fan operation；
As Tao≤Taod- K2 or during faulty compressor, unit enters complete natural cooling pattern：The closing of first control valve,
Second control valve unlatching, compressor shutdown, fan operation；
Wherein, TewodFor target temperature value, TaodFor patten transformation setting value, Td is return difference temperature, and Tao is environment temperature,
K1, K2 are the constant more than 0.
Further, described when selecting operational mode, the control method also includes：
If the given threshold of Tao >=first, and continue setting time, and compressor fault-free, then unit enters precooling pattern：First
Control valve closing, the second control valve unlatching, compressor operating, fan operation；
During precooling mode operation, if the given thresholds of Tao ＜ second, and continue setting time, then precooling pattern is exited, is entered
Enter refrigeration mode：The unlatching of first control valve, the second control valve closing, compressor operating, fan operation；Wherein, Tewod- K1 ＜
Second the first given thresholds of given threshold ＜.
Further, in refrigeration mode running：If Taod≤ Tao ＜ Tewod- K3, then operational mode conversion
For refrigeration plus natural cooling pattern：The closing of first control valve, the second control valve unlatching, compressor operating, fan operation；If Tewo
＜ Tewod- Td, then compressor emergency shutdown；Wherein, K3 is constant, and K3 ＞ K1.
Further, during refrigeration plus natural cooling mode operation：
If Tao≤Taod- K2 or compressor are faulty, then operational mode is converted to complete natural cooling pattern：First control
Valve closing, the second control valve unlatching, compressor shutdown, fan operation；
If Tao ＞ Tewod- K4, then operational mode be converted to refrigeration mode：First control valve is opened, the second control valve is closed,
Compressor operating, fan operation；
If Tewo ＜ TewodDuring-Td, then compressor emergency shutdown；
Wherein, K4 is constant more than 0, and K4 ＜ K1.
Further, during complete natural cooling mode operation：
If Tao ＞ Taod+ K5, then operational mode, which is converted to, freezes plus natural cooling pattern：First control valve is closed, the second control
Valve unlatching processed, compressor operating, fan operation；
If Tewo ＜ TewodDuring-Td, then compressor emergency shutdown；Wherein, K5 is the constant more than 0.
It is preferred that, in handpiece Water Chilling Units running：
Obtain Compressor Discharge Pressure Pd；
Judge whether Pd is more than or equal to setting exhaust pressure value；
If so, then controlling the closing of the first control valve, the second control valve unlatching, compressor operating, fan operation.
Further, in handpiece Water Chilling Units running：
Obtain Compressor Discharge Pressure Pd, pressure of inspiration(Pi) Ps；
Absolute pressure is calculated than Pr=Pd/Ps；
Judge whether Pr is more than or equal to the first setting pressure ratio value；
If so, then controlling the closing of the first control valve, the second control valve unlatching, compressor operating, fan operation.
Further, unit is in complete natural cooling pattern, according to Tewo and TewodDifference and Tewo change
Change trend adjustment rotation speed of fan.
Further, it is described according to Tewo and TewodDifference and Tewo variation tendency adjust blower fan rotating speed,
Specifically include：
（1）In Tewo- TewodDuring >=the first setting temperature difference, rotation speed of fan is improved；
（2）In the second setting temperature difference ＜ Tewo- TewodDuring≤the first setting temperature difference,
If Tewo variation tendency is is gradually reduced, rotation speed of fan is constant；
If Tewo variation tendency is vibration, rotation speed of fan is improved；
（3）In the 3rd setting temperature difference ＜ Tewo- TewodDuring≤the second setting temperature difference, rotation speed of fan is constant；
（4）In the 4th setting temperature difference ＜ Tewo- TewodDuring≤the three setting temperature difference,
If Tewo variation tendency is is gradually reduced or vibrated, rotation speed of fan reduction；
If Tewo variation tendency is gradually increases, rotation speed of fan is constant；
（5）In Tewo- TewodDuring≤the four setting temperature difference, then fan parking.
Further, unit is adjusted in refrigeration mode, refrigeration plus natural cooling pattern according to Compressor Discharge Pressure Pd
Whole rotation speed of fan：
（1）When Pd ＜ first set pressure, blower fan operates setting time with the first setting speed, then fan parking；
（2）When first sets pressure≤setting pressure of Pd ＜ second, blower fan is operated with the first setting speed；
（3）When second sets pressure≤setting pressure of Pd ＜ the 3rd,
If Pr >=second sets pressure ratio value, rotation speed of fan is constant；
If Pr ＜ second set pressure ratio value, rotation speed of fan reduction；
（4）When the 3rd sets pressure≤setting pressure of Pd ＜ the 4th,
If Pr >=second sets pressure ratio value, rotation speed of fan is improved；
If Pr ＜ second set pressure ratio value, rotation speed of fan reduction, until Pr >=second sets pressure ratio value；
（5）During Pd >=the 4th setting pressure, blower fan is operated with maximum (top) speed；
Wherein, absolute pressure is than Pr=Compressor Discharge Pressure Pd/ pressures of inspiration(Pi) Ps.
Compared with prior art, advantages and positive effects of the present invention are：The water chilling unit control method of the present invention,
Tewo ＞ TewodUnit starting up during+Td, selects the operational mode entered：As Tao ＞ Tewod- K1 and compressor is without reason
During barrier, unit enters refrigeration mode；Work as Taod≤ Tao ＜ Tewod- K1 and during compressor fault-free, unit enter refrigeration plus from
Right refrigerating mode；As Tao≤Taod- K2 or during faulty compressor, unit enters complete natural cooling pattern；Therefore, this hair
Bright water chilling unit control method, is judged, selection by the relation to leaving water temperature Tewo, environment temperature Tao, return difference temperature Td
The operational mode of entrance so that the control of unit is more accurate, and fluctuating temperature is smaller, makes full use of natural cooling, in energy-conservation
Requirement of the user to water temperature is met simultaneously, improves user experience.
After the embodiment that the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more clear
Chu.
Brief description of the drawings
Fig. 1 is the structural representation of handpiece Water Chilling Units in water chilling unit control method proposed by the invention；
Fig. 2 is the flow chart of one embodiment of water chilling unit control method proposed by the invention；
Fig. 3 is the flow chart of refrigeration mode in Fig. 2；
Fig. 4 is the flow chart of refrigeration plus natural cooling pattern in Fig. 2；
Fig. 5 is the flow chart of natural cooling pattern in Fig. 2.
Reference：
1st, compressor；2 condensers；3rd, condensation fan；4th, evaporator；5th, natural cooling coil pipe；6th, water inlet pipe；7th, outlet pipe；V1、
First control valve；V2, the second control valve.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below with reference to drawings and examples,
The present invention is described in further detail.
The present embodiment proposes a kind of water chilling unit control method, and handpiece Water Chilling Units mainly include compressor 1, condenser 2, cold
Solidifying blower fan 3, evaporator 4, the natural cooling coil pipe 5 for being arranged on the side of condenser 2, water inlet pipe 6, outlet pipe 7；Water inlet pipe 6 passes through
The water inlet of first control valve V1 connections evaporator 4；Water inlet pipe 6 is entered by the second control valve V2 connection natural coolings coil pipe 5
The mouth of a river, the delivery port of natural cooling coil pipe 5 connects the water inlet of evaporator 4；The delivery port connection outlet pipe 7 of evaporator 4, referring to
Shown in Fig. 1.
First control valve V1 and the second control valve V2 can also be realized by a triple valve.The He of natural cooling coil pipe 5
Condenser 2 is finned heat exchanger, V-shaped, and natural cooling coil pipe 5 is in the outside of condenser 2.
The water chilling unit control method of the present embodiment specifically includes following step, shown in Figure 2.
Step S1：Obtain the leaving water temperature Tewo of evaporator water outlet.
Leaving water temperature Tewo now, is in the feelings that compressor is not actuated, condensation fan is not actuated, V1 is opened, V2 is closed
Gathered under condition.
Step S2：Judge whether Tewo ＞ Tewod +Td。
If so, then performing step S3：Unit starting up, selects operational mode.
Tewo is the leaving water temperature of evaporator, TewodIt is target temperature value, i.e. temperature needed for user terminal, Td is return difference temperature
Degree, Tewo ＞ Tewod+ Td is the necessary condition of unit starting.Because unit control purpose be evaporator leaving water temperature
Tewo=Tewod+ Td, if Tewo≤Tewod+ Td, then need not start unit.
Return difference temperature Td（Alternatively referred to as compensation temperature）Design be to compensate for temperature losses, meet user uses water temperature
Degree, because water is after evaporator comes out, just reaches user terminal, water temperature is damaged in pipeline by outlet pipe and one section of pipeline
Consumption, for example, the water temperature T ewo that user wantsd12 DEG C, if water from evaporator come out after water temperature T ewo be 12 DEG C, water temperature is in pipe
2 DEG C are lost in road, after pipeline reaches user terminal, water temperature is 10 DEG C, user's requirement is not reached thus, not reaching unit will
The effect of control.Therefore, return difference temperature Td is designed, to supplement the temperature losses in pipeline, user's user's request is met.
Therefore, start-up command and Tewo ＞ Tewo are being receiveddDuring+Td, unit starting up obtains handpiece Water Chilling Units place
The environment temperature Tao in space, selects the operational mode entered.
Step S4：As Tao ＞ Tewod- K1 and during compressor fault-free, unit enters refrigeration mode：First control valve V1
Unlatching, the second control valve V2 closings, compressor operating, fan operation.
Unit starting enter refrigeration mode detailed process be：After unit starting → 1s → V1 open, V2 closings → 180s
Afterwards → water pump is opened（Water circulation starts）After → 30s current detection → 90s → compressor operating, fan operation.30s current are examined
Survey, be in order to prevent water pump open after water-carrying capacity it is too small, cause evaporator refrigerant side evaporating temperature too low, and then cause unit
Evaporator water side part nest pool is freezed, and damages evaporator.
Water in water inlet pipe enters evaporator through V1, and heat exchange, water temperature reduction, from evaporation are carried out with the refrigerant in evaporator
Device delivery port is discharged, and user terminal is delivered to through outlet pipe, after user terminal carries out heat exchange, subsequently into water inlet pipe, is followed successively
Ring.
In the present embodiment, rotation speed of fan is adjusted according to Compressor Discharge Pressure Pd, adds capacity adjustment scope, water temperature
Fluctuation is small, and energy-saving effect is more preferably.
Step S5：Work as Taod≤ Tao ＜ Tewod- K1 and during compressor fault-free, unit enters refrigeration plus natural cooling mould
Formula：First control valve V1 closings, the second control valve V2 unlatchings, compressor operating, fan operation.
Unit starting enters refrigeration plus the detailed process of natural cooling pattern is：After unit starting → 1s → V1 close, V2
After unlatching → 180s → water pump opening（Waterway circulating starts）After → 30s current detection → 90s → compressor operating, blower fan fortune
OK.
Water in water inlet pipe enters natural cooling coil pipe 5 through V2, and carrying out water temperature after heat exchange with air reduces, and enters back into steaming
The refrigerant sent out in device, with evaporator carries out heat exchange, and water temperature further reduces, reduces unit load, reached energy-saving effect.
Water route is exchanged heat by natural cooling coil pipe 5 and evaporator, has not only saved but also reached the purpose of reduction water temperature.I.e. natural cooling is carried
For a part of cold, remaining cold is produced by compressor start, and compressor can meet refrigeration requirement without full-speed operation, now
The power nor full-load power of compressor, play the purpose for subtracting consumption energy-conservation.
In the present embodiment, rotation speed of fan is adjusted according to Compressor Discharge Pressure Pd, adds capacity adjustment scope, water temperature
Fluctuation is small, and energy-saving effect is more preferably.
Step S6：As Tao≤Taod- K2 or during faulty compressor, unit enters complete natural cooling pattern：First
Control valve V1 closings, the second control valve V2 unlatchings, compressor shutdown, fan operation.
Unit starting enter complete natural cooling pattern detailed process be：After unit starting → 1s → V1 is closed, V2 is opened
Open → 180s after → water pump open（Waterway circulating starts）After → 30s current detection → 90s → compressor is not run, blower fan is transported
OK.
Water in water inlet pipe enters natural cooling coil pipe 5 through V2, and carrying out water temperature after heat exchange with air reduces, and enters back into steaming
Device is sent out, from the discharge of evaporator delivery port, user terminal is delivered to through outlet pipe.Water route is changed by natural cooling coil pipe 5 completely
Heat, reaches the purpose of energy-conservation.That is, whole refrigeration requirements can be just met by the natural cooling of natural cooling coil pipe 5, made full use of
Natural cooling, energy-saving consumption-reducing.
In the present embodiment, according to Tewo and TewodDifference and Tewo variation tendency adjustment rotation speed of fan, increase
Capacity adjustment scope, fluctuating temperature is small, and energy-saving effect is more preferably.
In the present embodiment, TaodFor patten transformation setting value, span is -5~10；TewodFor target temperature value,
Span is 12~20；Td is return difference temperature, and span is 2~5；K1, K2 are the constant more than 0.
The water chilling unit control method of the present embodiment, in Tewo ＞ TewodUnit starting up during+Td, what selection entered
Operational mode：As Tao ＞ Tewod- K1 and during compressor fault-free, unit enters refrigeration mode；Work as Taod≤ Tao ＜ Tewod
- K1 and during compressor fault-free, unit enters refrigeration plus natural cooling pattern；As Tao≤Taod- K2 or compressor are faulty
When, unit enters complete natural cooling pattern；Therefore, the water chilling unit control method of the present embodiment, by leaving water temperature
Tewo, environment temperature Tao, return difference temperature Td relation judge, select the operational mode entered so that the control of unit is more smart
Really, fluctuating temperature is smaller, makes full use of natural cooling, and requirement of the user to water temperature is met while energy-conservation, and improving user makes
With experience.
In the present embodiment, K1=3, K2=1.I.e.：
As Tao ＞ Tewod- 3 and during compressor fault-free, unit enters refrigeration mode；
Work as Taod≤ Tao ＜ Tewod- 3 and during compressor fault-free, into refrigeration plus natural cooling pattern；
As Tao≤Taod- 1 or during faulty compressor, unit enters complete natural cooling pattern.
In the present embodiment, in order to avoid alarm for high voltage, in the operational mode that unit starting, selection enter, the control
Method processed also includes：
Step S7：If the given threshold of Tao >=first, and continue setting time（Such as 10 minutes）, and compressor fault-free, then unit
Into precooling pattern：First control valve V1 closings, the second control valve V2 unlatchings, compressor operating, fan operation, according to compressor
Pressure at expulsion Pd adjusts rotation speed of fan；Water route enters natural cooling coil pipe 5, and the gas flow temperature of natural cooling coil pipe 5 is passed through in reduction,
And then reducing condensation temperature, it is to avoid there is alarm for high voltage under high circumstance temperature in unit, it is ensured that the normal operation of unit.
Step S8：During precooling mode operation, if the given thresholds of Tao ＜ second, and continue setting time（Such as 10 points
Clock）, then precooling pattern is exited, into refrigeration mode：First control valve V1 unlatchings, the second control valve V2 closings, compressor operating,
Fan operation.
In the present embodiment, Tewod- K1 ＜ the second given threshold the first given thresholds of ＜, such as the first given threshold are 43
DEG C, the second given threshold is 41 DEG C.
By setting precooling pattern, when environment temperature Tao is higher（Such as larger than 43 DEG C）, water route enters natural cooling coil pipe
5, the gas flow temperature of natural cooling coil pipe 5 is passed through in reduction, and then reduces condensation temperature, it is to avoid unit high pressure occurs under high circumstance temperature
Alarm.
When unit is in normal course of operation, according to the difference of environment temperature, the conversion of operational mode is carried out, both ensures to steam
The leaving water temperature of device is sent out, natural cooling is made full use of again, the purpose of energy-conservation is reached.
First, in refrigeration mode running, comprising the following steps that for patten transformation is carried out according to environment temperature Tao, joined
As shown in Figure 3：
Step S41：If Taod≤ Tao ＜ Tewod- K3, then unit progress patten transformation, is converted to refrigeration by refrigeration mode and adds
Natural cooling pattern：First control valve V1 closings, the second control valve V2 unlatchings, compressor operating, fan operation.In water inlet pipe
Water enters natural cooling coil pipe 5 through V2, and carrying out water temperature after heat exchange with air reduces, and evaporator is entered back into, in evaporator
Refrigerant carries out heat exchange, and water temperature further reduces, reduces unit load, reached energy-saving effect.
Wherein, K3 is constant, and K3 ＞ K1, such as K1=3, K3=5.
When environment temperature Tao changes, patten transformation is carried out, not only saves but also ensures leaving water temperature, and leaving water temperature is fluctuated
It is small.
In the present embodiment, it can be seen that the condition of refrigeration plus natural cooling pattern is converted to by refrigeration mode（Taod≤
Tao ＜ Tewod-K3）, into refrigeration plus the condition of natural cooling pattern during with unit starting（Taod≤ Tao ＜ Tewod-K1）
Difference, K3 ＞ K1（Such as K1=3, K3=5）, this is due in starting up, and environment temperature Tao is more slightly higher to can guarantee that unit is suitable
Profit start, it is to avoid low pressure alarming；In patten transformation, environment temperature Tao is more slightly lower, fluctuating temperature when can guarantee that patten transformation
It is small.
Step S42：If Tewo ＜ TewodDuring-Td, then compressor emergency shutdown.
In Tewo ＜ TewodDuring-Td, illustrate that user terminal indoor load is too low, without the indoor load short time of starting shooting
It is interior to rise very high, therefore shut down for the purpose of energy-conservation.
2nd, during refrigeration plus natural cooling mode operation, the specific step of patten transformation is carried out according to environment temperature Tao
It is rapid as follows, it is shown in Figure 4：
Step S51：If Tao≤Taod- K2, or compressor break down, then unit carries out patten transformation, by refrigeration plus certainly
Right refrigerating mode is converted to complete natural cooling pattern：First control valve V1 is closed, the second control valve V2 is opened, compressor stops
Machine, fan operation.Water in water inlet pipe enters natural cooling coil pipe 5 through V2, and carrying out water temperature after heat exchange with air reduces, then enters
Enter evaporator, from the discharge of evaporator delivery port, user terminal is delivered to through outlet pipe.Water route is entered by natural cooling coil pipe 5 completely
Row heat exchange, reaches the purpose of energy-conservation.
Unit is after refrigeration plus natural cooling patten transformation are complete natural cooling pattern, and the adjustment of rotation speed of fan switchs to root
According to Tewo and TewodDifference and Tewo variation tendency be adjusted；Because now compressor is out of service, row
Atmospheric pressure Pd is gradually reduced, if continuing to adjust rotation speed of fan according to pressure at expulsion Pd, blower fan will slow down and finally shut down.
Step S52：If Tao ＞ Tewod- K4, then unit progress patten transformation, adds natural cooling patten transformation by refrigeration
For refrigeration mode：First control valve V1 unlatchings, the second control valve V2 closings, compressor operating, fan operation.Water in water inlet pipe
Enter evaporator through V1, heat exchange, water temperature reduction, from the discharge of evaporator delivery port, through water outlet are carried out with the refrigerant in evaporator
Pipe is delivered to user terminal.
Wherein, K4 is constant more than 0, and K4 ＜ K1, such as K1=3, K4=1, K2=1.
In the present embodiment, it can be seen that by the condition of refrigeration plus natural cooling patten transformation for refrigeration mode（Tao ＞
Tewod- K4）, into the condition of refrigeration mode during with unit starting（Tao ＞ Tewod-K1）Difference, K4 ＜ K1（Such as K1=3,
K4=1）, unit starting enter refrigeration mode requirement environment temperature Tao it is relatively low, refrigeration plus natural cooling patten transformation for refrigeration
The environment temperature Tao of pattern requirement is higher；The higher ability of environment temperature Tao switchs to refrigeration mode by refrigeration plus natural cooling pattern,
That, while environment temperature Tao is higher, pressure at expulsion is big because the ability of possible utilization natural cooling big to the greatest extent, compression function compared with
Fast loading.
Step S53：If Tewo ＜ TewodDuring-Td, then compressor emergency shutdown.
3rd, during complete natural cooling mode operation, the specific steps of patten transformation are carried out according to environment temperature Tao
It is as follows, it is shown in Figure 5：
Step S61：If Tao ＞ Taod+ K5, then unit progress patten transformation, is added by complete natural cooling patten transformation for refrigeration
Natural cooling pattern：First control valve V1 closings, the second control valve V2 unlatchings, compressor operating, fan operation.In water inlet pipe
Water enters natural cooling coil pipe 5 through V2, and carrying out water temperature after heat exchange with air reduces, and evaporator is entered back into, in evaporator
Refrigerant carries out heat exchange, and water temperature further reduces, reduces unit load, reached energy-saving effect.
K5 is the constant more than 0, such as K5=4.
As can be seen that being refrigeration plus the condition of natural cooling pattern by complete natural cooling patten transformation（Tao ＞ Taod +
K5）, by refrigeration mode be converted to refrigeration plus natural cooling pattern condition（Taod≤ Tao ＜ Tewod-K3）, unit starting when
Into refrigeration plus the condition of natural cooling pattern（Taod≤ Tao ＜ Tewod-K1）It is different, Taod+ K5 ＜ Tewod- K3 ＜
Tewod- K1,（K1=3, K3=5, K5=4）；The environment temperature Tao highests required when refrigeration plus natural cooling pattern are launched into,
Ensure that evaporator evaporation temperature is higher during the compressor start of unit, it is to avoid compressor is more easy to start while low pressure alarming；By
The environment temperature Tao required when complete natural cooling patten transformation is refrigeration plus natural cooling pattern is minimum, it is ensured that operation reclaimed water
Temperature fluctuation is smaller；The environment temperature Tao required when being converted to refrigeration plus natural cooling pattern by refrigeration mode size is occupy
State therebetween, it is smaller also for fluctuating temperature in guarantee operation.
Step S62：If Tewo ＜ TewodDuring-Td, then compressor emergency shutdown.
In the present embodiment,, can collect and process machine exhaust pressure in order to avoid alarm for high voltage in handpiece Water Chilling Units running
Power Pd, controls unit operation according to Pd size, specifically includes：In unit running process, Compressor Discharge Pressure Pd is obtained,
Judge whether Pd is more than or equal to setting exhaust pressure value；If so, then controlling the first control valve V1 closings, the second control valve V2 to open
Open, compressor operating, fan operation, rotation speed of fan according to Pd carry out rotational speed regulation.Water route enters natural cooling coil pipe 5, reduction
By the gas flow temperature of natural cooling coil pipe 5, and then reduce condensation temperature, it is to avoid unit alarm for high voltage occurs under high circumstance temperature.
In the present embodiment, set exhaust pressure value to avoid causing unit to damage because Pd is excessive as 1.6, both, avoid again
Maloperation, influence unit is caused normally to run because Pd is too small.
As another preferred design of the present embodiment, in order to avoid alarm for high voltage, it can be controlled according to Pr size
Unit operation, is specifically included：In handpiece Water Chilling Units running, Compressor Discharge Pressure Pd, pressure of inspiration(Pi) Ps are obtained；Calculate exhausted
To pressure ratio Pr=Pd/Ps, judge whether Pr is more than or equal to the first setting pressure ratio value；If so, then control the first control valve V1 to close,
Second control valve V2 unlatchings, compressor operating, fan operation, rotation speed of fan carry out rotational speed regulation according to Pd.Water route enters nature
The gas flow temperature of natural cooling coil pipe 5 is passed through in cooling coil 5, reduction, and then reduces condensation temperature, it is to avoid unit is under high circumstance temperature
There is alarm for high voltage.
In the present embodiment, first set pressure ratio value and avoid causing unit to damage because Pr is excessive as 4.8, both, avoid again
Maloperation, influence unit is caused normally to run because Pr is too small.
In the present embodiment, the adjustment of rotational speed logic of blower fan includes two kinds：One be in complete natural cooling pattern, according to
Tewo and TewodDifference and Tewo variation tendency adjustment rotation speed of fan, two be refrigeration mode, refrigeration plus natural cooling
In pattern, rotation speed of fan is adjusted according to Compressor Discharge Pressure Pd.
Blower fan is the control of 0-10V d. c. voltage signals, and rotation speed of fan is divided into 14 grades according to voltage signal, specific as follows：
| Blower fan gear | Output voltage V | Rotation speed of fan rpm |
| 0 | 0 | 0 |
| 1 | 1 | 135 |
| 2 | 1.5 | 185 |
| 3 | 2 | 230 |
| 4 | 2.5 | 275 |
| 5 | 3 | 320 |
| 6 | 3.5 | 373 |
| 7 | 4 | 430 |
| 8 | 4.5 | 485 |
| 9 | 5 | 550 |
| 10 | 6 | 634 |
| 11 | 7 | 740 |
| 12 | 8 | 850 |
| 13 | 9 | 960 |
| 14 | 10 | 1082 |
After unit starting up enters complete natural cooling pattern, according to Tewo and TewodDifference and Tewo change
Trend adjustment rotation speed of fan, is specifically included：
（1）In Tewo- TewodDuring >=the first setting temperature difference, rotation speed of fan is improved.
For example, first sets the temperature difference as 2 DEG C, rotation speed of fan is improved according to the 120s speed for improving a gear.
（2）In the second setting temperature difference ＜ Tewo- TewodDuring≤the first setting temperature difference,
If Tewo variation tendency is is gradually reduced, i.e., leaving water temperature is gradually reduced, then rotation speed of fan is constant；
If Tewo variation tendency is vibration, i.e., fluctuated above and below leaving water temperature, then rotation speed of fan improves a gear.
（3）In the 3rd setting temperature difference ＜ Tewo- TewodDuring≤the second setting temperature difference, rotation speed of fan is constant.
（4）In the 4th setting temperature difference ＜ Tewo- TewodDuring≤the three setting temperature difference,
If Tewo variation tendency is is gradually reduced or vibrated, i.e., leaving water temperature is gradually reduced or fluctuated up and down, then rotation speed of fan
Reduce a gear；
If Tewo variation tendency is gradually increases, i.e., leaving water temperature is gradually increasing, then rotation speed of fan is constant.
（5）In Tewo- TewodDuring≤the four setting temperature difference, then fan parking.
In the present embodiment, first set the temperature difference as 2 DEG C, second set the temperature difference as the 0, the 3rd set the temperature difference as -0.5 DEG C,
4th -2 DEG C of the temperature difference of setting.
Pass through the above-mentioned adjustment to rotation speed of fan, it is to avoid evaporator leaving water temperature is fluctuated, and improves the stabilization of leaving water temperature
Property.
In the operation of refrigeration mode and refrigeration plus natural cooling pattern, and refrigeration plus natural mode switch to complete nature
After pattern, rotation speed of fan is adjusted according to Compressor Discharge Pressure Pd, it is to avoid leaving water temperature is fluctuated, and improves the stabilization of leaving water temperature
Property, specifically include：
（1）When Pd ＜ first set pressure, blower fan operates setting time with the first setting speed, then fan parking.
For example, first sets pressure as 0.35MPa, blower fan is with the 1st grade of rotating speed（Such as 135rpm）Operating 1 minute, Ran Houting
Machine.
（2）When first sets pressure≤setting pressure of Pd ＜ second, blower fan is operated with the first setting speed.
For example, the first setting pressure 0.35MPa, the second setting pressure 0.55MPa, rotation speed of fan reduces by one according to 20s
The speed reduction of gear, drops to first grade of rotating speed（Such as 135rpm）, with first grade of rotation speed operation.
（3）When second sets pressure≤setting pressure of Pd ＜ the 3rd,
If Pr >=second sets pressure ratio value, rotation speed of fan is constant；
If Pr ＜ second set pressure ratio value, rotation speed of fan is reduced according to the 20s speed for reducing a gear.
（4）When the 3rd sets pressure≤setting pressure of Pd ＜ the 4th,
If Pr >=second sets pressure ratio value, rotation speed of fan is improved according to the 20s speed for improving a gear；
If Pr ＜ second set pressure ratio value, rotation speed of fan is reduced according to the 20s speed for reducing a gear, until Pr >=the second
Set pressure ratio value.
（5）During Pd >=the 4th setting pressure, rotation speed of fan brings up to maximum (top) speed immediately from current rotating speed（Such as the 14th grade,
1082 rpm）Operating.
Wherein, absolute pressure is than Pr=Compressor Discharge Pressure Pd/ pressures of inspiration(Pi) Ps.
In the present embodiment, the first setting pressure 0.35MPa, the second setting pressure 0.55MPa, the 3rd setting pressure
0.85MPa, the 4th setting pressure 1.35MPa, second sets pressure ratio value as 1.9.
Pass through the above-mentioned adjustment to rotation speed of fan, it is to avoid evaporator leaving water temperature is fluctuated, and improves the stabilization of leaving water temperature
Property.
The water chilling unit control method of the present embodiment, in unit starting up, by leaving water temperature Tewo, environment temperature
Tao, return difference temperature Td judgement are spent, the operational mode entered is selected so that the control of unit is more accurate, while energy-conservation
Meet requirement of the user to water temperature；In unit normal course of operation, the switching of operational mode is carried out according to environment temperature Tao,
Both the leaving water temperature of evaporator had been ensured, and had reduced the fluctuation of leaving water temperature, natural cooling is made full use of again, the mesh of energy-saving consumption-reducing is reached
's.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although with reference to foregoing reality
Apply example the present invention is described in detail, for the person of ordinary skill of the art, can still implement to foregoing
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic；And these are changed or replaced
Change, the essence of appropriate technical solution is departed from the spirit and scope of claimed technical solution of the invention.
Claims (10)
1. a kind of water chilling unit control method, it is characterised in that：The handpiece Water Chilling Units include compressor, condenser, condensation fan,
Evaporator, natural cooling coil pipe, water inlet pipe, the outlet pipe for being arranged on condenser side；
The water inlet pipe connects the water inlet of the evaporator by the first control valve；The water inlet pipe is connected by the second control valve
The water inlet of the natural cooling coil pipe is connect, the delivery port of the natural cooling coil pipe connects the water inlet of the evaporator；Institute
State the delivery port connection outlet pipe of evaporator；
The control method includes：
Obtain the leaving water temperature Tewo of evaporator water outlet；
In Tewo ＞ TewodDuring+Td, unit starting up selects operational mode：
As Tao ＞ Tewod- K1 and during compressor fault-free, unit enters refrigeration mode：First control valve is opened, the second control
Valve closing, compressor operating, fan operation；
Work as Taod≤ Tao ＜ Tewod- K1 and during compressor fault-free, unit enters refrigeration plus natural cooling pattern：First control
Valve closing processed, the second control valve unlatching, compressor operating, fan operation；
As Tao≤Taod- K2 or during faulty compressor, unit enters complete natural cooling pattern：The closing of first control valve,
Second control valve unlatching, compressor shutdown, fan operation；
Wherein, TewodFor target temperature value, TaodFor patten transformation setting value, Td is return difference temperature, and Tao is environment temperature, K1,
K2 is the constant more than 0.
2. control method according to claim 1, it is characterised in that：It is described select operational mode when, the controlling party
Method also includes：
If the given threshold of Tao >=first, and continue setting time, and compressor fault-free, then unit enters precooling pattern：First
Control valve closing, the second control valve unlatching, compressor operating, fan operation；
During precooling mode operation, if the given thresholds of Tao ＜ second, and continue setting time, then precooling pattern is exited, is entered
Enter refrigeration mode：The unlatching of first control valve, the second control valve closing, compressor operating, fan operation；
Wherein, Tewod- K1 ＜ the second given threshold the first given thresholds of ＜.
3. control method according to claim 1, it is characterised in that：In refrigeration mode running：
If Taod≤ Tao ＜ Tewod- K3, then operational mode, which is converted to, freezes plus natural cooling pattern：The closing of first control valve,
Second control valve unlatching, compressor operating, fan operation；
If Tewo ＜ Tewod- Td, then compressor emergency shutdown；
Wherein, K3 is constant, and K3 ＞ K1.
4. control method according to claim 1, it is characterised in that：During refrigeration plus natural cooling mode operation：
If Tao≤Taod- K2 or compressor are faulty, then operational mode is converted to complete natural cooling pattern：First control valve
Closing, the second control valve unlatching, compressor shutdown, fan operation；
If Tao ＞ Tewod- K4, then operational mode be converted to refrigeration mode：First control valve is opened, the second control valve is closed,
Compressor operating, fan operation；
If Tewo ＜ TewodDuring-Td, then compressor emergency shutdown；
Wherein, K4 is constant more than 0, and K4 ＜ K1.
5. control method according to claim 1, it is characterised in that：During complete natural cooling mode operation：
If Tao ＞ Taod+ K5, then operational mode, which is converted to, freezes plus natural cooling pattern：First control valve is closed, the second control
Valve unlatching, compressor operating, fan operation；
If Tewo ＜ TewodDuring-Td, then compressor emergency shutdown；
Wherein, K5 is the constant more than 0.
6. control method according to claim 1, it is characterised in that：In handpiece Water Chilling Units running：
Obtain Compressor Discharge Pressure Pd；
Judge whether Pd is more than or equal to setting exhaust pressure value；
If so, then controlling the closing of the first control valve, the second control valve unlatching, compressor operating, fan operation.
7. control method according to claim 1, it is characterised in that：In handpiece Water Chilling Units running：
Obtain Compressor Discharge Pressure Pd, pressure of inspiration(Pi) Ps；
Absolute pressure is calculated than Pr=Pd/Ps；
Judge whether Pr is more than or equal to the first setting pressure ratio value；
If so, then controlling the closing of the first control valve, the second control valve unlatching, compressor operating, fan operation.
8. control method according to claim 1, it is characterised in that：Unit in complete natural cooling pattern, according to
Tewo and TewodDifference and Tewo variation tendency adjustment rotation speed of fan.
9. control method according to claim 8, it is characterised in that：It is described according to Tewo and TewodDifference and Tewo
Variation tendency adjust blower fan rotating speed, specifically include：
（1）In Tewo- TewodDuring >=the first setting temperature difference, rotation speed of fan is improved；
（2）In the second setting temperature difference ＜ Tewo- TewodDuring≤the first setting temperature difference,
If Tewo variation tendency is is gradually reduced, rotation speed of fan is constant；
If Tewo variation tendency is vibration, rotation speed of fan is improved；
（3）In the 3rd setting temperature difference ＜ Tewo- TewodDuring≤the second setting temperature difference, rotation speed of fan is constant；
（4）In the 4th setting temperature difference ＜ Tewo- TewodDuring≤the three setting temperature difference,
If Tewo variation tendency is is gradually reduced or vibrated, rotation speed of fan reduction；
If Tewo variation tendency is gradually increases, rotation speed of fan is constant；
（5）In Tewo- TewodDuring≤the four setting temperature difference, then fan parking.
10. control method according to claim 1, it is characterised in that：Unit is in refrigeration mode, refrigeration plus natural cooling mould
In formula, rotation speed of fan is adjusted according to Compressor Discharge Pressure Pd：
（1）When Pd ＜ first set pressure, blower fan operates setting time with the first setting speed, then fan parking；
（2）When first sets pressure≤setting pressure of Pd ＜ second, blower fan is operated with the first setting speed；
（3）When second sets pressure≤setting pressure of Pd ＜ the 3rd,
If Pr >=second sets pressure ratio value, rotation speed of fan is constant；
If Pr ＜ second set pressure ratio value, rotation speed of fan reduction；
（4）When the 3rd sets pressure≤setting pressure of Pd ＜ the 4th,
If Pr >=second sets pressure ratio value, rotation speed of fan is improved；
If Pr ＜ second set pressure ratio value, rotation speed of fan reduction, until Pr >=second sets pressure ratio value；
（5）During Pd >=the 4th setting pressure, blower fan is operated with maximum (top) speed；
Wherein, absolute pressure is than Pr=Compressor Discharge Pressure Pd/ pressures of inspiration(Pi) Ps.
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| CN110736276A (en) * | 2019-10-21 | 2020-01-31 | 无锡职业技术学院 | Control method of natural cooling refrigeration systems |
| CN110953778A (en) * | 2019-12-17 | 2020-04-03 | 重庆美的通用制冷设备有限公司 | Control method and system of refrigeration equipment, refrigeration equipment and readable storage medium |
| CN111536672A (en) * | 2020-04-10 | 2020-08-14 | 珠海格力电器股份有限公司 | Water chilling unit and control method thereof |
| CN111637611A (en) * | 2020-05-18 | 2020-09-08 | 珠海格力电器股份有限公司 | Water chilling unit control method and device, storage medium and water chilling unit |
| CN112178872A (en) * | 2020-09-18 | 2021-01-05 | 珠海格力电器股份有限公司 | Water chilling unit control method and device and water chilling unit |
| CN114136033A (en) * | 2021-11-25 | 2022-03-04 | 珠海格力电器股份有限公司 | Natural cooling system working mode switching method and system and natural cooling system |
| CN114198889A (en) * | 2021-12-17 | 2022-03-18 | 珠海格力电器股份有限公司 | Air-cooled chiller system, control method thereof, controller and storage medium |
| CN117128626A (en) * | 2023-07-21 | 2023-11-28 | 江森自控日立万宝空调(广州)有限公司 | Self-adaptive adjusting method for cooling mode of natural cooling air conditioning unit |
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Effective date of registration: 20201116 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR-CONDITIONING ELECTRONIC Co.,Ltd. Patentee after: Haier Smart Home Co., Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR-CONDITIONING ELECTRONIC Co.,Ltd. |