CN114322134A - Natural cooling air conditioning unit and control method thereof - Google Patents
Natural cooling air conditioning unit and control method thereof Download PDFInfo
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- CN114322134A CN114322134A CN202111554295.3A CN202111554295A CN114322134A CN 114322134 A CN114322134 A CN 114322134A CN 202111554295 A CN202111554295 A CN 202111554295A CN 114322134 A CN114322134 A CN 114322134A
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- 238000001816 cooling Methods 0.000 title claims abstract description 122
- 238000004378 air conditioning Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 146
- 239000007788 liquid Substances 0.000 claims description 12
- 238000005057 refrigeration Methods 0.000 abstract description 12
- 239000003507 refrigerant Substances 0.000 description 15
- 238000007710 freezing Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 239000002352 surface water Substances 0.000 description 4
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention provides a natural cooling air conditioning unit and a control method thereof, wherein a compressor of the unit is respectively connected with a condenser and an evaporator, a first control valve is arranged on a pipeline for connecting the condenser and the evaporator, an inlet and an outlet of an air source heat exchanger and an inlet and an outlet of a water source heat exchanger are respectively connected with an outlet and an inlet of the natural cooling heat exchanger through connecting pipelines, a second control valve is arranged on a connecting pipeline between the inlet of the air source heat exchanger and the outlet of the natural cooling heat exchanger, a third control valve is arranged on a connecting pipeline between the inlet of the water source heat exchanger and the outlet of the natural cooling heat exchanger, a water inlet of the evaporator is connected with a water outlet of the natural cooling heat exchanger through a connecting pipeline, a water inlet of the natural cooling heat exchanger is connected with a water return port on a user side, and a water outlet of the evaporator is connected with a water supply port on the user side. The invention can utilize various cold sources and can switch among different cold sources, thereby widening the operation range of natural cooling refrigeration, and being more energy-saving and efficient.
Description
Technical Field
The invention relates to the technical field of natural cooling air conditioning unit control, in particular to a natural cooling air conditioning unit and a control method thereof.
Background
At present, natural cooling air conditioning units in the prior art can utilize a natural cooling source for refrigeration, but can only utilize a single natural cooling source.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a natural cooling air conditioning unit and a control method thereof, which can utilize various cold sources and can switch between different cold sources, thereby widening the operating range of natural cooling refrigeration, and leading the unit to be more energy-saving and efficient.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a natural cooling air conditioning unit comprises a compressor, a condenser, an evaporator, an air source heat exchanger, a natural cooling heat exchanger and a water source heat exchanger, wherein the compressor is respectively connected with the condenser and the evaporator, a first control valve is arranged on a pipeline for connecting the condenser and the evaporator, an inlet and an outlet of the air source heat exchanger and an inlet and an outlet of the water source heat exchanger are respectively connected with an outlet and an inlet of the natural cooling heat exchanger through connecting pipelines, a second control valve is arranged on a connecting pipeline between the inlet of the air source heat exchanger and the outlet of the natural cooling heat exchanger, a third control valve is arranged on a connecting pipeline between the inlet of the water source heat exchanger and the outlet of the natural cooling heat exchanger, a water inlet of the evaporator is mutually connected with a water outlet of the natural cooling heat exchanger through a connecting pipeline, a water inlet of the natural cooling heat exchanger is connected with a water return port on a user side, the water outlet of the evaporator is connected with a water supply port at the user side.
According to the natural cooling air conditioning unit, various cold sources are utilized, wherein the cold sources comprise an air cold source and a water source for refrigeration, namely, cold in low-temperature air can be utilized by an air source heat exchanger, cold in surface water or underground water can be utilized by a water source heat exchanger, secondary refrigerant in the air source heat exchanger exchanges heat with low-temperature air in the environment, then the cold is transmitted to a user in a natural cooling heat exchanger, the secondary refrigerant in the water source heat exchanger exchanges heat with the surface water or the underground water, then the cold is transmitted to the user, and the operation range of using the natural cooling refrigeration is widened by switching among different cold sources through a control valve, so that the unit is more energy-saving and efficient.
With respect to the above technical solution, further improvements as described below can be made.
In a preferred embodiment, a fan is provided adjacent to the condenser.
Through setting up the fan, can strengthen intraductal high temperature high pressure refrigerant and environment heat transfer, make the high pressure in the fin condenser reduce to reduce condensation temperature.
Further, in a preferred embodiment, the air source heat exchanger is adjacent to the condenser and shares a set of fans with the condenser.
Through sharing a set of fan, not only can simplify the structure of whole natural cooling air conditioning unit and save the cost, can also strengthen the heat transfer of secondary refrigerant and low temperature environment in the air source heat exchanger, increase the heat transfer volume, make the exit temperature among the air source heat exchanger reduce.
Further, in a preferred embodiment, the condenser comprises at least two sets and the air source heat exchanger comprises at least two sets.
Through corresponding multiunit condenser and the air source heat exchanger of setting up, can improve the suitability of whole natural cooling unit to a very big degree.
Further, in a preferred embodiment, a connection line between the inlet of the air source heat exchanger and the outlet of the natural cooling heat exchanger is interconnected with a connection line between the inlet of the water source heat exchanger and the outlet of the natural cooling heat exchanger, and a connection line between the outlet of the air source heat exchanger and the inlet of the natural cooling heat exchanger is interconnected with a connection line between the outlet of the water source heat exchanger and the inlet of the natural cooling heat exchanger.
Through the converging connection among the pipelines, the structure of the internal pipeline can be further simplified, the cost is saved, and the control is convenient.
Further, in a preferred embodiment, a one-way valve is arranged on a connecting pipeline between the outlet of the air source heat exchanger and the inlet of the natural cooling heat exchanger.
Through setting up the check valve, can effectively avoid the secondary refrigerant to flow back and influence the heat transfer effect of whole unit at the circulation in-process.
Further, in a preferred embodiment, a liquid pump is arranged on a connecting pipeline between the outlet of the natural cooling heat exchanger and the inlet of the air source heat exchanger and the inlet of the water source heat exchanger.
Through setting up the liquid pump, can effectively improve the work efficiency of whole unit.
Specifically, in a preferred embodiment, the first control valve is an expansion valve, and the second control valve and the third control valve are both solenoid valves.
The control valves with various structures can ensure the convenience and the reliability of switching of each cold source of the unit to a great extent.
The control method of the natural cooling air conditioning unit in the second aspect of the present invention is implemented by the natural cooling air conditioning unit, and includes the following steps: s01, when the temperature difference between the water inlet temperature of the natural cooling heat exchanger and the water inlet temperature of the water source heat exchanger is not larger than a first preset temperature, and the temperature difference between the water outlet temperature supplied by the evaporator to a user and the environment temperature is not larger than a second preset temperature, the first control valve is opened, and the second control valve and the third control valve are closed; s02, when the temperature difference between the water inlet temperature of the natural cooling heat exchanger and the water inlet temperature of the water source heat exchanger is larger than a first preset temperature, and the temperature difference between the water outlet temperature supplied by the evaporator to a user and the environment temperature is not larger than a second preset temperature, closing the first control valve and the second control valve, and opening the third control valve;
s03, when the temperature difference between the water inlet temperature of the natural cooling heat exchanger and the water inlet temperature of the water source heat exchanger is not larger than a first preset temperature, and the temperature difference between the water outlet temperature supplied by the evaporator to a user and the environment temperature is larger than a second preset temperature, closing the first control valve and the third control valve, and opening the second control valve; and S04, when the temperature difference between the water inlet temperature of the natural cooling heat exchanger and the water inlet temperature of the water source heat exchanger is larger than a first preset temperature, and the temperature difference between the water outlet temperature supplied by the evaporator to a user and the ambient temperature is larger than a second preset temperature, closing the first control valve, and opening the second control valve and the third control valve.
Specifically, according to the control method of the natural cooling air conditioning unit, when the temperature difference between the inlet water temperature of the natural cooling heat exchanger and the inlet water temperature of the water source heat exchanger is not greater than the first preset temperature, and the temperature difference between the outlet water temperature supplied by the evaporator to the user and the ambient temperature is not greater than the second preset temperature, the natural cooling side is not operated, and only the refrigerant cooling side is operated. The unit natural cooling side operation mode has three kinds:
water source only: when the environment temperature is higher, the available cold quantity in the air source is less, but the water source temperature is lower and stable, and the cold quantity of the water source can be utilized to refrigerate by using the water source heat exchanger;
adding a water source into an air source: when the ambient temperature is reduced and the air source temperature and the water source temperature are both low, the refrigeration capacity in the air source and the water source can be utilized simultaneously for refrigeration, and at the moment, the air source heat exchanger and the water source heat exchanger are both operated;
air source only: the ambient temperature continues to be reduced to the freezing point accessory, the freezing risk exists on the water source side, the cold energy in the water source cannot be utilized at the moment, the flow path of the water source heat exchanger is closed, the air source temperature is very low, and the high refrigerating capacity and energy efficiency can be realized by directly utilizing the air source.
Specifically, in a preferred embodiment, the first preset temperature is 4-6 ℃ and the second preset temperature is 4-6 ℃.
The first preset temperature and the second preset temperature are controlled within the range, so that the control accuracy and the stability and the reliability of the whole unit can be effectively ensured.
Compared with the prior art, the invention has the advantages that: the multiple cold sources can be utilized, the switching among different cold sources can be realized, the running range of natural cooling refrigeration is widened, and the unit is more energy-saving and efficient.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
fig. 1 schematically shows the overall framework principle of the free cooling air conditioning unit according to an embodiment of the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained in detail with reference to the figures and the embodiments without thereby limiting the scope of protection of the invention.
Fig. 1 schematically shows the overall framework principle of a free cooling air conditioning unit 10 according to an embodiment of the present invention. Wherein, the directions of arrows respectively show the corresponding refrigerant circuit, the refrigerating medium circuit, the user water supply circuit and the natural cold water circuit in each circulation route.
Example 1
As shown in fig. 1, a natural cooling air conditioning unit 10 according to an embodiment of the present invention includes a compressor 1, a condenser 2, an evaporator 3, an air source heat exchanger 4, a natural cooling heat exchanger 5, and a water source heat exchanger 6, wherein the compressor 1 is connected to the condenser 2 and the evaporator 3, a first control valve 7 is disposed on a pipeline connecting the condenser 2 and the evaporator 3, an inlet and an outlet of the air source heat exchanger 4 and an inlet and an outlet of the water source heat exchanger 6 are connected to each other through a connecting pipeline corresponding to an outlet and an inlet of the natural cooling heat exchanger 5, a second control valve 8 is disposed on a connecting pipeline between the inlet of the air source heat exchanger 4 and the outlet of the natural cooling heat exchanger 5, a third control valve 9 is disposed on a connecting pipeline between the inlet of the water source heat exchanger 6 and the outlet of the natural cooling heat exchanger 5, a water inlet of the evaporator 3 is connected to a water outlet of the natural cooling heat exchanger 5 through a connecting pipeline, the water inlet of the natural cooling heat exchanger 5 is connected with the user side water return port, and the water outlet of the evaporator 3 is connected with the user side water supply port.
According to the natural cooling air conditioning unit provided by the embodiment of the invention, various cold sources are utilized, wherein the natural cooling air conditioning unit comprises an air cold source and a water source for refrigeration, namely, the cold energy in low-temperature air can be utilized by an air source heat exchanger, the cold energy of surface water or underground water can be utilized by a water source heat exchanger, the secondary refrigerant in the air source heat exchanger exchanges heat with the low-temperature air in the environment, then the cold energy is transmitted to a user in a natural cooling heat exchanger, the secondary refrigerant in the water source heat exchanger exchanges heat with the surface water or the underground water, then the cold energy is transmitted to the user, and the operation range of using the natural cooling refrigeration is widened by switching among different cold sources through a control valve, so that the unit is more energy-saving and efficient.
As shown in fig. 1, further, in the present embodiment, a check valve 101 is provided on a connection line between the outlet of the air source heat exchanger 4 and the inlet of the natural cooling heat exchanger 5. Through setting up the check valve, can effectively avoid the secondary refrigerant to flow back and influence the heat transfer effect of whole unit at the circulation in-process. Further, in the present embodiment, a liquid pump 102 is provided on a connection line between the outlet of the natural cooling heat exchanger 5 and the inlet of the air source heat exchanger 4 and the inlet of the water source heat exchanger 6. Through setting up the liquid pump, can effectively improve the work efficiency of whole unit. Specifically, in the present embodiment, the first control valve 7 is an expansion valve, and the second control valve 8 and the third control valve 9 are both solenoid valves. The control valves with various structures can ensure the convenience and the reliability of switching of each cold source of the unit to a great extent.
Further, as shown in fig. 1, in the present embodiment, a fan 103 is provided at a position close to the condenser 2. Through setting up the fan, can strengthen intraductal high temperature high pressure refrigerant and environment heat transfer, make the high pressure in the fin condenser reduce to reduce condensation temperature. Further, in the present embodiment, the air source heat exchanger 4 is close to the condenser 2 and shares a set of fans 103 with the condenser 2, and the air source heat exchanger 4 is symmetrically arranged on both sides of the condenser 2 in an inclined manner. Through a set of fan of sharing, not only can simplify the structure of whole natural cooling air conditioning unit and save the cost, can also strengthen the heat transfer of secondary refrigerant and low temperature environment in the air source heat exchanger, increase the heat transfer volume, make the exit temperature among the air source heat exchanger reduce, the air source heat exchanger of symmetrical arrangement can increase heat exchange efficiency to a very big extent, improves the suitability of unit. Further, in the present embodiment, the condenser 2 includes at least two sets, and the air source heat exchanger 4 includes at least two sets. Through corresponding multiunit condenser and the air source heat exchanger of setting up, can improve the suitability of whole natural cooling unit to a very big degree.
Further, as shown in fig. 1, in the present embodiment, the connection line between the inlet of the air source heat exchanger 4 and the outlet of the natural cooling heat exchanger 5 is interconnected with the connection line between the inlet of the water source heat exchanger 6 and the outlet of the natural cooling heat exchanger 5, and the connection line between the outlet of the air source heat exchanger 4 and the inlet of the natural cooling heat exchanger 5 is interconnected with the connection line between the outlet of the water source heat exchanger 6 and the inlet of the natural cooling heat exchanger 5. Through the converging connection among the pipelines, the structure of the internal pipeline can be further simplified, the cost is saved, and the control is convenient.
Preferably, in the present embodiment, the water source heat exchanger 6 includes any one of a cooling tower, an indirect evaporation heat exchanger, and a heat pipe.
Example 2
As shown in fig. 1, the method for controlling a natural cooling air conditioning unit according to an embodiment of the present invention is implemented by using the natural cooling air conditioning unit 10 described above, and includes the following steps: s01, when the temperature difference between the inlet water temperature of the natural cooling heat exchanger 5 and the inlet water temperature of the water source heat exchanger 6 is not larger than a first preset temperature, and the temperature difference between the outlet water temperature supplied by the evaporator 3 and the environment temperature is not larger than a second preset temperature, the first control valve 7 is opened, and the second control valve 8 and the third control valve 9 are closed; s02, when the temperature difference between the inlet water temperature of the natural cooling heat exchanger 5 and the inlet water temperature of the water source heat exchanger 6 is larger than a first preset temperature, and the temperature difference between the outlet water temperature supplied by the evaporator 3 to a user and the environment temperature is not larger than a second preset temperature, closing the first control valve 7 and the second control valve 8, and opening the third control valve 9; s03, when the temperature difference between the inlet water temperature of the natural cooling heat exchanger 5 and the inlet water temperature of the water source heat exchanger 6 is not larger than a first preset temperature, and the temperature difference between the outlet water temperature supplied by the evaporator 3 to a user and the environment temperature is larger than a second preset temperature, closing the first control valve 7 and the third control valve 9, and opening the second control valve 8; s04, when the temperature difference between the temperature of the inlet water of the natural cooling heat exchanger 5 and the temperature of the inlet water of the water source heat exchanger 6 is greater than a first preset temperature, and the temperature difference between the temperature of the outlet water supplied to the user by the evaporator 3 and the ambient temperature is greater than a second preset temperature, the first control valve 7 is closed, and the second control valve 8 and the third control valve 9 are opened. Specifically, in the present embodiment, the first preset temperature is 4 to 6 ℃, particularly preferably 5 ℃, and the second preset temperature is 4 to 6 ℃, particularly preferably 5 ℃. The first preset temperature and the second preset temperature are controlled within the range, so that the control accuracy and the stability and the reliability of the whole unit can be effectively ensured.
Specifically, according to the control method of the natural cooling air conditioning unit in the embodiment of the present invention, when the temperature difference between the inlet water temperature of the natural cooling heat exchanger 5 and the inlet water temperature of the water source heat exchanger 6 is not greater than the first preset temperature, and the temperature difference between the outlet water temperature supplied to the user by the evaporator 3 and the ambient temperature is not greater than the second preset temperature, the natural cooling side is not operated, and only the refrigerant cooling side is operated. The unit natural cooling side operation mode has three kinds:
water source only: when the ambient temperature is higher, the available cold capacity in the air source is less, but the water source temperature is lower and stable, the cold capacity of the water source can be utilized at the moment, the water source heat exchanger 6 is used for refrigerating, and the natural cooling side flow path is as follows: liquid pump 102 → third control valve 9 → water source heat exchanger 6 → natural cooling heat exchanger 5;
adding a water source into an air source: ambient temperature reduces, and when air source and water source temperature were all lower, can utilize the cold volume refrigeration in air source and the water source simultaneously, and air source heat exchanger 4 and water source heat exchanger 6 all run this moment, and the side flow path of natural cooling is: liquid pump 102 → second control valve 8 → air source heat exchanger 4 → check valve 101 → natural cooling heat exchanger 5, liquid pump 102 → third control valve 9 → water source heat exchanger 6 → natural cooling heat exchanger 5;
air source only: ambient temperature continues to reduce to the freezing point annex, and the water source side has the risk of freezing, can't utilize the cold volume in the water source this moment, closes 6 flow paths of water source heat exchanger, and air source temperature is very low, directly utilizes the air source can realize higher refrigerating output and efficiency, and the natural cooling side flow path is this moment: second control valve 8 → air source heat exchanger 4 → check valve 101 → natural cooling heat exchanger 5.
The specific cold source switching method comprises the following steps:
setting the outlet water temperature tws (outlet water temperature for users) -ambient temperature thj of the shell and tube of the evaporator 3 by the air source natural cooling opening temperature difference delta tf; wherein, tws is a settable parameter, the default is 7 ℃, and thj is a detection parameter;
water source natural cooling opening temperature difference Δ ts is water inlet temperature (backwater temperature from user side) twj of natural cooling heat exchanger 5 — water inlet temperature (water inlet temperature obtained from outside) ts of water source heat exchanger 6; wherein twj and ts are detection parameters;
when delta ts is less than or equal to 5 ℃ and delta tf is less than or equal to 5 ℃, the natural cooling side of the unit does not run, the liquid pump 102 is closed, the fan 103 is controlled by the compressor side, and the second control valve 8 and the third control valve 9 are kept closed; the fan 103 is started to enhance the heat exchange between the high-temperature and high-pressure refrigerant in the tube and the environment, so that the high pressure in the finned condenser 2 is reduced, and the condensation temperature is reduced.
When delta ts is more than 5 ℃ and delta tf is less than or equal to 5 ℃, the unit enters a water source natural cooling mode, the liquid pump 102 is started, the fan 103 is closed, the second control valve 8 is kept closed, and the third control valve 9 is started;
when delta ts is less than or equal to 5 ℃ and delta tf is more than 5 ℃, the unit enters an air source natural cooling mode, the liquid pump 102 and the fan 103 are started, the second control valve 8 is started, and the third control valve 9 is kept closed; the fan 103 is started to enhance the heat exchange between the secondary refrigerant in the air source heat exchanger 4 and the low-temperature environment, so that the heat exchange amount is increased, and the outlet temperature in the air source heat exchanger 4 is reduced.
When delta ts is more than 5 ℃ and delta tf is more than 5 ℃, the unit enters an air source water adding source natural cooling mode, the liquid pump 102 and the fan 103 are started, the second control valve 8 is started, and the third control valve 9 is started; in the mode, the compressor 1 is not started, the fan 103 does not play any role in the condenser 2, and the effect of enhancing heat exchange can be played for the air source heat exchanger 4.
According to the embodiment, the natural cooling air conditioning unit and the control method thereof can utilize various cold sources and can switch among different cold sources, the operation range of natural cooling refrigeration is widened, and the unit is more energy-saving and efficient.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A natural cooling air conditioning unit is characterized by comprising a compressor, a condenser, an evaporator, an air source heat exchanger, a natural cooling heat exchanger and a water source heat exchanger; wherein,
the compressor is respectively connected with the condenser and the evaporator, and a first control valve is arranged on a pipeline connecting the condenser and the evaporator;
the inlet and the outlet of the air source heat exchanger and the inlet and the outlet of the water source heat exchanger are mutually connected through connecting pipelines corresponding to the outlet and the inlet of the natural cooling heat exchanger, and a second control valve is arranged on a connecting pipeline between the inlet of the air source heat exchanger and the outlet of the natural cooling heat exchanger; a third control valve is arranged on a connecting pipeline between the inlet of the water source heat exchanger and the outlet of the natural cooling heat exchanger;
the water inlet of the evaporator is connected with the water outlet of the natural cooling heat exchanger through a connecting pipeline, the water inlet of the natural cooling heat exchanger is connected with the user side water return port, and the water outlet of the evaporator is connected with the user side water supply port.
2. The free-cooling air conditioning unit set forth in claim 1, wherein a fan is located adjacent to the condenser.
3. The free-cooling air conditioning unit set forth in claim 2, wherein said air source heat exchanger is adjacent said condenser and shares a set of fans with said condenser.
4. A naturally cooling air conditioning unit as set forth in any one of claims 1 to 3 wherein said condenser comprises at least two sets and said air source heat exchanger comprises at least two sets.
5. The free-cooling air conditioning unit according to any one of claims 1 to 3, wherein a connection line between the inlet of the air source heat exchanger and the outlet of the free-cooling heat exchanger is interconnected with a connection line between the inlet of the water source heat exchanger and the outlet of the free-cooling heat exchanger;
and a connecting pipeline between the outlet of the air source heat exchanger and the inlet of the natural cooling heat exchanger is mutually connected with a connecting pipeline between the outlet of the water source heat exchanger and the inlet of the natural cooling heat exchanger.
6. The free-cooling air conditioning unit according to any one of claims 1 to 3, wherein a check valve is provided on a connection line between the outlet of the air source heat exchanger and the inlet of the free-cooling heat exchanger.
7. The free-cooling air conditioning unit according to any one of claims 1 to 3, wherein a liquid pump is provided on a connection pipeline between the outlet of the free-cooling heat exchanger and the inlet of the air source heat exchanger and the inlet of the water source heat exchanger.
8. The free-cooling air conditioning unit according to any one of claims 1 to 3, wherein the first control valve is an expansion valve, and the second control valve and the third control valve are both solenoid valves.
9. A method for controlling a free-cooling air conditioning unit, implemented by the free-cooling air conditioning unit according to any one of claims 1 to 8, characterized by comprising the steps of:
s01, when the temperature difference between the water inlet temperature of the natural cooling heat exchanger and the water inlet temperature of the water source heat exchanger is not larger than a first preset temperature, and the temperature difference between the water outlet temperature supplied by the evaporator to a user and the environment temperature is not larger than a second preset temperature, the first control valve is opened, and the second control valve and the third control valve are closed;
s02, when the temperature difference between the water inlet temperature of the natural cooling heat exchanger and the water inlet temperature of the water source heat exchanger is larger than a first preset temperature, and the temperature difference between the water outlet temperature supplied by the evaporator to a user and the environment temperature is not larger than a second preset temperature, closing the first control valve and the second control valve, and opening the third control valve;
s03, when the temperature difference between the water inlet temperature of the natural cooling heat exchanger and the water inlet temperature of the water source heat exchanger is not larger than a first preset temperature, and the temperature difference between the water outlet temperature supplied by the evaporator to a user and the environment temperature is larger than a second preset temperature, closing the first control valve and the third control valve, and opening the second control valve;
and S04, when the temperature difference between the water inlet temperature of the natural cooling heat exchanger and the water inlet temperature of the water source heat exchanger is larger than a first preset temperature, and the temperature difference between the water outlet temperature supplied by the evaporator to a user and the ambient temperature is larger than a second preset temperature, closing the first control valve, and opening the second control valve and the third control valve.
10. The control method of the natural cooling air conditioning unit according to claim 9, wherein the first preset temperature is 4-6 ℃ and the second preset temperature is 4-6 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111554295.3A CN114322134A (en) | 2021-12-17 | 2021-12-17 | Natural cooling air conditioning unit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111554295.3A CN114322134A (en) | 2021-12-17 | 2021-12-17 | Natural cooling air conditioning unit and control method thereof |
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| CN114322134A true CN114322134A (en) | 2022-04-12 |
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| CN202111554295.3A Pending CN114322134A (en) | 2021-12-17 | 2021-12-17 | Natural cooling air conditioning unit and control method thereof |
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- 2021-12-17 CN CN202111554295.3A patent/CN114322134A/en active Pending
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