CN115711498A - Air conditioning unit and control method thereof - Google Patents
Air conditioning unit and control method thereof Download PDFInfo
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- CN115711498A CN115711498A CN202211494421.5A CN202211494421A CN115711498A CN 115711498 A CN115711498 A CN 115711498A CN 202211494421 A CN202211494421 A CN 202211494421A CN 115711498 A CN115711498 A CN 115711498A
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- 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
Abstract
The invention discloses an air conditioning unit and a control method thereof. The air conditioning unit includes: the first branch is communicated with a refrigerant outlet of the hot water heat exchanger through a first branch, communicated with an S port of a four-way valve through a first branch, respectively communicated with a gas suction pipe of a compressor and a refrigerant outlet of a chilled water heat exchanger through a second branch, and communicated with a refrigerant inlet of the chilled water heat exchanger through a third branch; one end of the second branch is communicated with a refrigerant outlet pipeline of the hot water heat exchanger, and the other end of the second branch is communicated with a pipeline connected with a first port A of the air-cooled heat exchanger; and the second port B of the air-cooled heat exchanger is communicated with the refrigerant inlet of the hot water heat exchanger through the third branch. The invention can be independently adjusted according to the load of the cooling side or the load demand of the heating side through the branch and the control valve during the combined supply of the cold and the heat.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a four-pipe air conditioning unit capable of independently adjusting the cold and heat load requirements in a cold and heat combined supply operation mode and a control method thereof.
Background
Compared with the traditional heat pump unit, the four-pipe air conditioner unit has the greatest advantages of simultaneously supplying cold and heat and realizing the maximum utilization of energy. However, when an ordinary four-pipe unit is used for simultaneous cooling and heating, when a cold and heat load (or called as a user-side cold and heat load demand) is unbalanced, namely, when a heat supply demand is large and a cooling capacity demand is small or a heat supply demand is small and a cooling capacity demand is large, the unit cannot adjust and adapt to the demand, usually, one side with a small load demand is used as a reference for adjustment and control, otherwise, the system capacity output is too large to cause standby or even protective shutdown.
Disclosure of Invention
The invention provides a four-pipe air conditioning unit capable of independently adjusting cold and heat load requirements and a control method thereof, and aims to solve the technical problem that independent adjustment cannot be performed according to the requirements of a cold supply side or a heat supply side when cooling and heating are simultaneously performed in the prior art.
The four-pipe air conditioning unit provided by the invention comprises a compressor, a four-way valve, a hot water heat exchanger, a chilled water heat exchanger and an air cooling heat exchanger, and also comprises:
the first port A of the air-cooled heat exchanger is communicated with a refrigerant outlet of the hot water heat exchanger through a first branch, a first electronic expansion valve is arranged on the first branch, one end of the first electronic expansion valve is communicated with an S port of the four-way valve through a first branch, a first electromagnetic valve is arranged on the first branch, the other end of the first electronic expansion valve is respectively communicated with an air suction pipe of the compressor and a refrigerant outlet of the chilled water heat exchanger through a second branch, a second electromagnetic valve is arranged on the second branch, the first branch is also communicated with a refrigerant inlet of the chilled water heat exchanger through a third branch, and a third electronic expansion valve is arranged on the third branch;
one end of the second branch is communicated with a refrigerant outlet pipeline of the hot water heat exchanger, the other end of the second branch is communicated with a pipeline connected with the first port A of the air-cooled heat exchanger, and a second electronic expansion valve is arranged on the second branch;
and a second port B of the air-cooled heat exchanger is communicated with a refrigerant inlet of the hot water heat exchanger through a third branch, a third electromagnetic valve is arranged on the third branch, a port C of the four-way valve is communicated with one side, close to the air-cooled heat exchanger, of the third electromagnetic valve through a fourth branch, and a port E of the four-way valve is communicated with one side, close to the hot water heat exchanger, of the third electromagnetic valve through a fifth branch.
Preferably, a first one-way valve is arranged on a pipeline between the connecting positions of the second branch and the first branch and the connecting positions of the third branch and the first branch.
Preferably, a second one-way valve is arranged on a pipeline between the connecting positions of the first branch and the second branch and the first branch.
Preferably, a third check valve is arranged on a refrigerant outlet pipeline of the hot water heat exchanger.
When the air conditioning unit operates in an independent refrigerating mode, the first electronic expansion valve is closed, the second electronic expansion valve is fully opened, the third electronic expansion valve is opened, and the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the third electromagnetic valve are closed.
When the air conditioning unit is operated for heating alone, the first electronic expansion valve is fully opened, the second electronic expansion valve is opened, the third electronic expansion valve is closed, the first electromagnetic valve and the second electromagnetic valve are opened, and the third electromagnetic valve is closed.
According to the air conditioning unit provided by the invention, when the air conditioning unit is supplied with combined cooling and heating and the cooling and heating load does not need to be adjusted independently, the third electronic expansion valve is opened, the first electronic expansion valve and the second electronic expansion valve are closed, and the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are closed.
According to the air conditioning unit provided by the invention, when the air conditioning unit is supplied with combined cooling and heating and the cooling load needs to be adjusted independently, the first electronic expansion valve, the second electronic expansion valve, the third electronic expansion valve and the third electromagnetic valve are opened, and the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are closed.
According to the air conditioning unit provided by the invention, when the air conditioning unit is supplied with combined cooling and heating and the heat load needs to be adjusted independently, the first electronic expansion valve is closed, the second electronic expansion valve is fully opened, the third electronic expansion valve is opened, the first electromagnetic valve and the second electromagnetic valve are closed, and the third electromagnetic valve is opened.
The invention also provides a control method of the air conditioning unit, which comprises the following steps: when the combined cooling and heating supply is carried out and the refrigerating capacity demand is far smaller than the heating capacity demand, the compressor takes the water temperature at the heating side as a control target and carries out loading and unloading on the chilled water heat exchanger through the second branch bypass; when the cooling and heating combined supply is carried out and the refrigerating capacity requirement is far greater than the heating capacity requirement, the compressor takes the water temperature at the side of the freezing chamber heat exchanger as a control target, and the hot water heat exchanger is loaded and unloaded through the first branch bypass.
When the chilled water heat exchanger is loaded and unloaded through the second branch bypass, the first electronic expansion valve, the second electronic expansion valve, the third electronic expansion valve and the third electronic expansion valve are opened, the first electromagnetic valve and the second electromagnetic valve are opened, and the third electromagnetic valve is closed.
When the hot water heat exchanger is loaded and unloaded through the first branch bypass, the first electronic expansion valve is closed, the second electronic expansion valve is fully opened, the third electronic expansion valve is opened, the first electromagnetic valve and the second electromagnetic valve are closed, and the third electromagnetic valve is opened.
Compared with the prior art, the four-pipe air conditioning unit and the control method thereof can independently adjust the load output of the cold supply side or the heat supply side under the working condition of simultaneous cooling and heating.
Drawings
FIG. 1 is a system diagram of a four-pipe air conditioning unit designed according to the present invention;
FIG. 2 is a flow diagram of the refrigerant in a single refrigeration cycle of the present invention;
FIG. 3 is a flow diagram of the refrigerant in the case of single heat generation according to the present invention;
fig. 4 is a flow diagram of the refrigerant without separately adjusting the cooling capacity or the heating capacity in the combined cooling and heating system according to the present invention;
FIG. 5 is a flow diagram of the refrigerant for independently adjusting the cooling capacity in the combined cooling and heating operation according to the present invention;
FIG. 6 is a control flow chart of independently adjusting the cooling capacity during combined cooling and heating according to the present invention;
FIG. 7 is a refrigerant flow diagram for independently adjusting the heat supply amount in the combined cooling and heating system according to the present invention;
FIG. 8 is a control flow chart of independently adjusting the heat supply amount during the combined supply of cold and heat in the present invention.
Wherein: the system comprises a compressor 1, a four-way valve 2, an air-cooled heat exchanger 3, a third electronic expansion valve 4, a chilled water heat exchanger 5, a hot water heat exchanger 6, a first electronic expansion valve 7, a first solenoid valve 8, a second solenoid valve 9, a third solenoid valve 10, a second electronic expansion valve 11, a first check valve 12, a second check valve 13, a third check valve 14, a first branch 15, a second branch 16, a third branch 17, a first branch 18, a second branch 19, a third branch 20, a fourth branch 21 and a fifth branch 22.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are only for illustrating the present invention and are not to be construed as limiting the present invention.
Fig. 1 is a system diagram of a four-pipe air conditioning unit designed by the present invention, which includes a compressor 1, a four-way valve 2, an air-cooled heat exchanger 3 (in this embodiment, a fin-tube heat exchanger is used), a chilled water heat exchanger 5, and a hot water heat exchanger 6, and further includes:
a first branch 15, wherein a first port A of the air-cooled heat exchanger 3 is communicated with a refrigerant outlet of the hot water heat exchanger 6 through a first branch, a first electronic expansion valve 7 is arranged on the first branch, one end of the first electronic expansion valve is communicated with an S port of the four-way valve through a first branch 18, a first solenoid valve 8 is arranged on the first branch, the other end of the first electronic expansion valve 7 is respectively communicated with an air suction pipe of the compressor 1 and a refrigerant outlet of the chilled water heat exchanger 5 through a second branch 19, a second solenoid valve 9 is arranged on the second branch, the first branch 15 is also communicated with a refrigerant inlet of the chilled water heat exchanger 5 through a third branch 20, and a third electronic expansion valve 4 is arranged on the third branch;
one end of the second branch 16 is communicated with a refrigerant outlet pipeline of the hot water heat exchanger 6, the other end of the second branch is communicated with a pipeline connected with the first port A of the air-cooled heat exchanger 3, and a second electronic expansion valve 11 is arranged on the second branch;
and a third branch 17, a second port B of the air-cooled heat exchanger 3 is communicated with a refrigerant inlet of the hot water heat exchanger 6 through the third branch, a third electromagnetic valve 10 is arranged on the third branch, a port C of the four-way valve is communicated with one side of the third electromagnetic valve 10 close to the air-cooled heat exchanger through a fourth branch 21, and a port E of the four-way valve is communicated with one side of the third electromagnetic valve 10 close to the hot water heat exchanger through a fifth branch 22.
A first check valve 12 is provided on the pipe between the connection points of the second branch 19 and the third branch 20 with the first branch 15. A second one-way valve 13 is arranged on the pipeline between the connection positions of the first branch 18 and the second branch 16 with the first branch 15. And a third check valve 14 is arranged on a refrigerant outlet pipeline of the hot water heat exchanger 3.
The invention can realize multiple operation modes of the air conditioning unit through different pipeline and valve designs, including a single refrigeration mode, a single heating mode and a combined cooling and heating mode, and can realize that a part of refrigerant is led into the air-cooled heat exchanger through a branch and flow regulation is carried out by utilizing the electronic expansion valve on the premise of simultaneous refrigeration and heating so as to adapt to the change requirements of cold load or heat load.
When the four-pipe air conditioning unit designed by the invention operates in the single refrigeration mode, the first electronic expansion valve 7 is kept closed, the second electronic expansion valve 11 is kept at the maximum opening degree, the first electromagnetic valve 8, the second electromagnetic valve 9 and the third electromagnetic valve 10 are kept closed, the four-way valve 2 is in a power-off state, the D, C ports are communicated, and the S, E ports are communicated. The refrigerant flow at this time is as shown in fig. 2: the system comprises a compressor 1, a D port of a four-way valve, a C port of the four-way valve, an air-cooled heat exchanger 3, a second electronic expansion valve 11, a third electronic expansion valve 4, a chilled water heat exchanger 5 and the compressor 1. At this time, the refrigeration demand can be adjusted by adjusting the frequency of the third electronic expansion valve 4, the fan of the air-cooled heat exchanger 3, and the compressor.
In the single cooling mode, after the refrigerant passes through the air-cooled heat exchanger 3, the refrigerant cannot flow in the direction of the first electronic expansion valve 7 due to the action of the second check valve 13 (the pressure of the second check valve on the air-cooled heat exchanger 3 side is higher than the pressure on the first electronic expansion valve 7 side). After the refrigerant passes through the second electronic expansion valve 11, since the second electronic expansion valve is kept in the fully open state at all times and there is no throttling action, the refrigerant after the second electronic expansion valve is still in a high-pressure state, and the refrigerant cannot flow in the direction of the hot water side heat exchanger 6 due to the action of the third check valve 14 (the pressure of the third check valve on the second electronic expansion valve side is higher than that on the hot water side heat exchanger side). Before the refrigerant passes through the third electronic expansion valve 4, the refrigerant cannot flow to the first electronic expansion valve 7 side due to the action of the first check valve 12 (the pressure of the first check valve is higher on the third electronic expansion valve side than on the first electronic expansion valve 7 side).
When the four-pipe air conditioning unit designed by the invention runs in the single heating mode, the first electronic expansion valve 7 keeps the maximum opening degree, the second electronic expansion valve 11 is opened, the third electronic expansion valve 4 is closed, the third solenoid valve 10 is closed, the first solenoid valve 8 and the second solenoid valve 9 are opened, the four-way valve is electrified, the D, E ports are communicated with each other, and the S, C ports are communicated with each other.
The refrigerant flow at this time is as shown in fig. 3: the system comprises a compressor 1, a port D of a four-way valve, a port E of the four-way valve, a hot water heat exchanger 6, a second electronic expansion valve 11, an air-cooled heat exchanger 3, a port C of the four-way valve, a port S of the four-way valve, a first electromagnetic valve 8, a first electronic expansion valve 7, a second electromagnetic valve 9 and the compressor 1. The operation mode can adjust the heating requirement by adjusting the second electronic expansion valve 11, the fan of the air-cooled heat exchanger and the frequency of the compressor.
In the single heating mode, the refrigerant does not directly flow through the second check valve 13 to the direction of the first electronic expansion valve 7 after passing through the second electronic expansion valve 11 and before entering the air-cooled heat exchanger 3, because the pressure of the second check valve is lower in the direction close to the first electronic expansion valve. The refrigerant generates pressure loss through the air cooling heat exchanger 3 and the four-way valve 2, so that the pressure is continuously reduced in the flowing process, and the pressure at the air suction port of the compressor is the lowest. After passing through the first electronic expansion valve 7, the refrigerant does not flow through the first check valve 12 to the third electronic expansion valve 4, because the refrigerant (in a high-pressure state) passing through the hot water heat exchanger 6 is also poured into the front end pipeline of the first check valve 12, so that the first check valve 12 is always in a high-pressure state near the third electronic expansion valve 4.
When the four-pipe air conditioning unit designed by the invention operates in a cooling and heating mode (also called cooling and heating combined supply), the first electronic expansion valve 7 and the second electronic expansion valve 11 are kept closed, the first electromagnetic valve 8, the second electromagnetic valve 9 and the third electromagnetic valve 10 are kept closed, the four-way valve is electrified, the D, E ports are communicated, and the S, C ports are communicated.
The refrigerant flow at this time is as shown in fig. 4: the system comprises a compressor 1, a four-way valve D port, a four-way valve E port, a hot water heat exchanger 6, a third one-way valve 14, a third electronic expansion valve 4, a chilled water heat exchanger 5 and the compressor 1. The simultaneous increase (or simultaneous decrease) in cooling capacity and heating capacity can be adjusted by adjusting the third electronic expansion valve and the frequency of the compressor.
When the four-pipe air conditioning unit designed by the invention operates in a simultaneous cooling and heating mode (also called combined cooling and heating), and the demand on cooling capacity is far less than the demand on heating capacity, the compressor is loaded and unloaded by taking the temperature of water at the heating side as a control target (the compressor meets the demand on heating capacity). At this time, the second electronic expansion valve 11 is gradually opened and opened from 0, the first solenoid valve 8 and the second solenoid valve 9 are opened, the third solenoid valve 10 is closed, and the first electronic expansion valve 7 is fully opened (opened to the maximum opening degree).
The refrigerant flow direction is as shown in fig. 5: the refrigerant passing through the third one-way valve 14 is bypassed (throttled simultaneously) by the electronic expansion valve 11 on the second branch 16, the bypassed refrigerant flows into the air-cooled heat exchanger 3 after being throttled, the fan is turned on, the refrigerant absorbs heat from the environment, and then is bypassed to the ports C and S of the four-way valve by the third branch 17, passes through the first solenoid valve 8, the first electronic expansion valve 7 and the second solenoid valve 9, and returns to the suction port of the compressor. At this time, the hot water side water temperature is controlled by the compressor, and the cold water side water temperature is controlled by the second electronic expansion valve 11.
The flow of adjusting and controlling the cold quantity in the combined cooling and heating mode is shown in fig. 6, the unit operates, the compressor takes the heating side water temperature Th as a control target, and simultaneously requires the heating side water temperature Tc to meet the target refrigerating water temperature, at this time, the first electronic expansion valve 7 is fully opened, the second electronic expansion valve 11 is opened to a specified opening degree, for example, 5%, the third electronic expansion valve 4 is opened, the first electromagnetic valve 8 and the second electromagnetic valve 9 are opened, and the compressor is loaded or unloaded according to the heating side water temperature Th; the third electronic expansion valve 4 is adjusted according to the refrigerating side water temperature, and the refrigerating side water temperature Tc is greater than the target refrigerating water temperature and is turned off by 1%, and if the refrigerating side water temperature Tc is less than the target refrigerating water temperature, is turned on by 1%.
When the four-pipe air conditioning unit designed by the invention operates and supplies cold and heat simultaneously (also called cold and heat combined supply), and the refrigerating capacity demand is far larger than the heating capacity demand, the compressor takes the refrigerating side water temperature (the water temperature of the chilled water heat exchanger) as a control target to load and unload (the compressor meets the refrigerating capacity demand), at the moment, the first electronic expansion valve 7 is closed, the second electronic expansion valve 11 is fully opened, and the third electromagnetic valve 4 is opened.
The flow direction of the refrigerant is as shown in fig. 7: and a part of the gaseous refrigerant passing through the outlet of the four-way valve E enters the hot water heat exchanger 6, a part of exhaust gas flows to the air-cooled heat exchanger 3 through a third electromagnetic valve 10 on a third branch 17 to be bypassed, the bypassed refrigerant enters the air-cooled heat exchanger to be condensed, the fan is opened, the refrigerant releases heat to the environment, the bypassed refrigerant passes through a second electronic expansion valve 11 and then is converged with the refrigerant flowing out of the hot water heat exchanger 6, and then the bypassed refrigerant flows into the chilled water heat exchanger 5 after being throttled by a third electronic expansion valve 4 and then returns to the compressor for circulation. At the moment, the water temperature of the cold water side is controlled by a compressor, and the water temperature of the hot water side is controlled by a fan of the air-cooled heat exchanger.
As shown in fig. 8, in the control flow of this mode, when the unit is operated, the compressor takes the cooling-side water temperature as a control target, and the water temperature of the hot water side is to meet the target heating water temperature, at this time, the third electromagnetic valve 10 is opened, the second electronic expansion valve 11 is fully opened, the first electronic expansion valve 7 is closed, the third electronic expansion valve 4 is opened, and the compressor is loaded or unloaded according to the cooling-side water temperature Tc; the water temperature Th of the heating side is adjusted by adjusting the frequency of the fans or starting the number of the fans, when the water temperature Th of the heating side is larger than the target heating water temperature, the air volume is increased, and when the water temperature Th of the heating side is smaller than the target heating water temperature, the air volume is decreased.
The reason why the fan can be adjusted to control the water temperature at the hot side in this mode is that the refrigerant bypassed by the third electromagnetic valve 10 on the third branch is introduced into the high-temperature and high-pressure gaseous refrigerant, and the refrigerant enters the air-cooled heat exchanger 3 to be condensed, when the heat exchange effect is poor (the operation frequency of the fan can be reduced or the number of the fans can be reduced), the gas phase ratio of the refrigerant in the heat exchanger is large (the gas phase state is in a high-speed flowing state in the condenser), the pressure loss of the refrigerant in the air-cooled heat exchanger is large (namely, the pressure drop of the condenser is large), at this time, the bypassed refrigerant amount is low, and the heat bypassed by the air-cooled heat exchanger is small; when the heat exchange effect is good (the operation frequency of the fan can be increased or the number of the started fans can be increased), the liquid phase ratio of the refrigerant in the air-cooled heat exchanger is large (the liquid phase is in a low-speed flowing state in the condenser), the pressure loss of the refrigerant in the air-cooled heat exchanger is small (namely the pressure drop of the condenser is small), the amount of the bypassed refrigerant is high at the moment, and the heat bypassed by the air-cooled heat exchanger is large. Therefore, the heating capacity can be independently reduced by adjusting the air quantity of the fan, and the heating capacity can be independently increased by reducing the air quantity.
In summary, the four-pipe air conditioning system provided by the invention not only has multiple operation modes of independent refrigeration, independent heating and combined cooling and heating, but also can be independently adjusted according to the load on the cooling side or the load on the heating side when cooling and heating are simultaneously carried out, so as to adapt to the different demands of users.
The foregoing is considered as illustrative only of the embodiments of the invention. It should be understood that any modifications, equivalents and changes made within the spirit and framework of the inventive concept are intended to be included within the scope of the present invention.
Claims (12)
1. The utility model provides an air conditioning unit, includes compressor, cross valve, hot water heat exchanger, refrigerated water heat exchanger and forced air cooling heat exchanger, its characterized in that still includes:
the first port A of the air-cooled heat exchanger is communicated with a refrigerant outlet of the hot water heat exchanger through a first branch, a first electronic expansion valve is arranged on the first branch, one end of the first electronic expansion valve is communicated with an S port of the four-way valve through a first branch, a first electromagnetic valve is arranged on the first branch, the other end of the first electronic expansion valve is respectively communicated with an air suction pipe of the compressor and a refrigerant outlet of the chilled water heat exchanger through a second branch, a second electromagnetic valve is arranged on the second branch, the first branch is also communicated with a refrigerant inlet of the chilled water heat exchanger through a third branch, and a third electronic expansion valve is arranged on the third branch;
one end of the second branch is communicated with a refrigerant outlet pipeline of the hot water heat exchanger, the other end of the second branch is communicated with a pipeline connected with the first port A of the air-cooled heat exchanger, and a second electronic expansion valve is arranged on the second branch;
and a second port B of the air-cooled heat exchanger is communicated with a refrigerant inlet of the hot water heat exchanger through a third branch, a third electromagnetic valve is arranged on the third branch, a port C of the four-way valve is communicated with one side, close to the air-cooled heat exchanger, of the third electromagnetic valve through a fourth branch, and a port E of the four-way valve is communicated with one side, close to the hot water heat exchanger, of the third electromagnetic valve through a fifth branch.
2. The air conditioning assembly as set forth in claim 1, wherein a first check valve is provided on a pipe between the connection locations of the second branch and the third branch with the first branch.
3. The air conditioning assembly as set forth in claim 1, wherein a second check valve is provided on a pipe between the first branch and a connection location of the second branch with the first branch.
4. The air conditioning unit as set forth in claim 1, wherein a third check valve is provided on a refrigerant outlet pipe of the hot water heat exchanger.
5. The air conditioning unit as set forth in claim 1, wherein when the air conditioning unit is operated for cooling alone, the first electronic expansion valve is closed, the second electronic expansion valve is fully opened, the third electronic expansion valve is opened, and the first to third solenoid valves are all closed.
6. The air conditioning assembly as set forth in claim 1, wherein when the air conditioning assembly is operating for heating alone, the first electronic expansion valve is fully open, the second electronic expansion valve is open, the third electronic expansion valve is closed, the first and second solenoid valves are open, and the third solenoid valve is closed.
7. The air conditioning assembly as set forth in claim 1, wherein when the cooling and heating of the air conditioning assembly are combined and the cooling and heating load is not separately adjusted, the third electronic expansion valve is opened, the first and second electronic expansion valves are closed, and the first to third solenoid valves are closed.
8. The air conditioning assembly as set forth in claim 1, wherein when the air conditioning assembly is combined for cooling and heating and the cooling load needs to be adjusted individually, the first to third electronic expansion valves are opened, the first and second electromagnetic valves are opened, and the third electromagnetic valve is closed.
9. The air conditioning unit as set forth in claim 1, wherein when the air conditioning unit is combined for cooling and heating and the heating load needs to be adjusted separately, the first electronic expansion valve is closed, the second electronic expansion valve is fully opened, the third electronic expansion valve is opened, the first and second solenoid valves are closed, and the third solenoid valve is opened.
10. The control method of the air conditioning unit according to any one of claims 1 to 9, wherein when the cooling-heating cogeneration is performed and the cooling demand is much smaller than the heating demand, the compressor loads and unloads the chilled water heat exchanger through the second branch bypass with the heating side water temperature as a control target; when the cold and heat combined supply is carried out and the refrigerating capacity demand is far greater than the heating capacity demand, the compressor takes the water temperature at the side of the heat exchanger of the freezing chamber as a control target, and the hot water heat exchanger is loaded and unloaded through the bypass of the first branch.
11. The control method as set forth in claim 10, wherein when the chilled water heat exchanger is loaded and unloaded by the second bypass, the first to third electronic expansion valves are opened, the first and second solenoid valves are opened, and the third solenoid valve is closed.
12. The control method as set forth in claim 10, wherein when the hot water heat exchanger is charged and discharged through the first bypass, the first electronic expansion valve is closed, the second electronic expansion valve is fully opened, the third electronic expansion valve is opened, the first and second solenoid valves are closed, and the third solenoid valve is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211494421.5A CN115711498A (en) | 2022-11-25 | 2022-11-25 | Air conditioning unit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211494421.5A CN115711498A (en) | 2022-11-25 | 2022-11-25 | Air conditioning unit and control method thereof |
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| Publication Number | Publication Date |
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| CN115711498A true CN115711498A (en) | 2023-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211494421.5A Pending CN115711498A (en) | 2022-11-25 | 2022-11-25 | Air conditioning unit and control method thereof |
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| CN (1) | CN115711498A (en) |
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2022
- 2022-11-25 CN CN202211494421.5A patent/CN115711498A/en active Pending
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