CN114923239A - Compressor and fluorine pump combined air conditioning system and control method thereof - Google Patents

Abstract

The invention is suitable for the technical field of refrigeration, and discloses a compressor and fluorine pump composite air-conditioning system and a control method thereof, wherein the compressor, a condenser, a fluorine pump, a throttling element and an evaporator which are sequentially connected and form a closed loop are included, a condensing fan and a spraying device are arranged on the condenser, and the spraying direction of the spraying device is countercurrent to the wind direction of the condensing fan; the system also comprises a first bypass branch and a second bypass branch, wherein the first bypass branch is connected to two ends of the compressor, a first check valve is arranged on the first bypass branch, the second bypass branch is connected to two ends of the fluorine pump, and a second check valve is arranged on the second bypass branch; this system is through controlling opening of compressor and fluorine pump and stopping, forms compressor refrigeration mode, fluorine pump refrigeration mode and mix three kinds of mode altogether of refrigeration, and it adds spray set moreover, when outdoor dry-bulb wet bulb difference in temperature is great, through spray set with outdoor dry-bulb temperature precooling to being close wet-bulb temperature, can reduce the compressor energy consumption.

Description

Compressor and fluorine pump combined air conditioning system and control method thereof

Technical Field

The invention relates to the technical field of refrigeration, in particular to a compressor and fluorine pump combined air conditioning system and a control method thereof.

Background

Data center IT equipment power density is big, and thermal load is high, has higher requirement to the humiture, generally needs special air conditioning system to guarantee data center's steady operation. According to energy consumption analysis of the data center, the air conditioning system is the first high-energy consumption system except IT equipment in the data center, and the power consumption of the air conditioning system accounts for 35% -40% of the total power consumption of the data center.

In order to save the power consumption of an air conditioning system, the conventional air conditioning system usually adopts a composite air conditioning system of a fluorine pump and a compressor, the conventional compressor system is connected with the fluorine pump system in series, the compressor refrigeration cycle is adopted under the condition of high outdoor temperature in summer and the like, the fluorine pump refrigeration cycle is adopted under the condition of low outdoor temperature in winter and the like, and the fluorine pump is used for driving a refrigerant to guide the heat in a machine room to the outside of the machine room and radiate the heat to the environment. Because the running power consumption of the fluorine pump is less than that of the compressor, the aim of saving energy can be achieved by using the refrigeration cycle of the fluorine pump to replace the refrigeration cycle of the compressor.

However, the energy saving effect of the existing composite air conditioning system with the fluorine pump and the compressor needs to be further improved, for example, when the temperature difference between the outdoor dry bulb and the outdoor wet bulb is large, outdoor air directly enters the condenser, so that the energy consumption of the compressor is increased, and the energy saving is not facilitated.

Disclosure of Invention

The invention aims to provide a compressor and fluorine pump combined air conditioning system, which is additionally provided with a spraying device, when the temperature difference between outdoor dry bulb and outdoor wet bulb is large, the outdoor dry bulb temperature is pre-cooled to be close to the wet bulb temperature through the spraying device, and therefore, the energy consumption of the compressor can be reduced.

In order to achieve the purpose, the invention provides the following scheme:

a compressor and fluorine pump combined air conditioning system comprises a compressor, a condenser, a fluorine pump, a throttling element and an evaporator, wherein the compressor, the condenser, the fluorine pump, the throttling element and the evaporator are sequentially connected to form a closed loop; the condenser is provided with a condensing fan and a spraying device, the spraying device is arranged on the air inlet surface of the condenser, and the spraying direction of the spraying device is back to the condenser and is in counter-current with the wind direction of the condensing fan; the compressor and fluorine pump composite air conditioning system further comprises a first bypass branch and a second bypass branch, a first end of the first bypass branch is connected with a pipeline between the evaporator and the compressor, a second end of the first bypass branch is connected with a pipeline between the compressor and the condenser, a first check valve is arranged on the first bypass branch, a first end of the second bypass branch is connected with a pipeline between the condenser and the fluorine pump, a second end of the second bypass branch is connected with a pipeline between the fluorine pump and the evaporator, and a second check valve is arranged on the second bypass branch.

Preferably, the air conditioner further comprises an air suction solenoid valve, and the air suction solenoid valve is arranged at the air suction end of the compressor.

Preferably, the air conditioner further comprises an air discharge check valve arranged between the compressor and the condenser.

Preferably, the fluorine pump further comprises a first stop valve and a second stop valve, wherein the first stop valve is arranged at the inlet end of the fluorine pump, and the second stop valve is arranged at the outlet end of the fluorine pump.

Preferably, a liquid reservoir is further included, the liquid reservoir being disposed between the condenser and the fluorine pump.

Preferably, a first filter is further included, the first filter being disposed between the condenser and the accumulator.

Preferably, a second filter is also included, the second filter being disposed between the fluorine pump and the throttling element.

Preferably, the fluorine pump further comprises a liquid level sight glass, and the liquid level sight glass is arranged between the fluorine pump and the throttling element.

Preferably, an evaporation fan is arranged on the evaporator.

The second purpose of the present invention is to provide a control method for the compressor and fluorine pump combined air-conditioning system as described above, wherein the compressor and fluorine pump combined air-conditioning system includes three operation modes, namely a compressor refrigeration mode, a fluorine pump refrigeration mode and a hybrid refrigeration mode; the compressor and fluorine pump combined air-conditioning system operates in the compressor refrigeration mode, the compressor and the second check valve are opened, and the fluorine pump and the first check valve are closed; the compressor and fluorine pump composite air conditioning system operates the fluorine pump refrigeration mode, the fluorine pump and the first check valve are opened, and the compressor and the second check valve are closed; the compressor and fluorine pump combined air-conditioning system operates in the mixed refrigeration mode, the compressor and the fluorine pump are started, and the first check valve and the second check valve are closed;

the control method comprises the following steps: judging whether the outdoor environment temperature is higher than a first preset temperature, if so, running the compressor refrigeration mode by the compressor and fluorine pump composite air-conditioning system, if not, judging whether the outdoor environment temperature is lower than a second preset temperature, if so, running the fluorine pump refrigeration mode by the compressor and fluorine pump composite air-conditioning system, and if not, running the mixed refrigeration mode by the compressor and fluorine pump composite air-conditioning system;

and judging whether the temperature difference between the outdoor dry bulb temperature and the outdoor wet bulb temperature is greater than a preset temperature difference value, if so, starting the spraying device, and if not, closing the spraying device.

The compressor and fluorine pump combined air-conditioning system provided by the invention has the following advantages:

firstly, a compressor and fluorine pump combined air-conditioning system forms three working modes of a compressor refrigeration mode, a fluorine pump refrigeration mode and a mixed refrigeration mode by controlling the starting and stopping of the compressor and the fluorine pump, and the system runs the compressor refrigeration mode in high-temperature seasons in summer; in spring and autumn transition seasons, the system operates a mixed refrigeration mode, the condensation pressure of a compressor is reduced, the pressure in front of a throttling element is increased through the pressurization of a fluorine pump, the flow rate of a refrigerant is increased, and the required refrigeration capacity is achieved; in winter at low temperature, the system runs a fluorine pump refrigeration mode, a free natural cold source is completely utilized to provide required refrigeration capacity, the energy consumption of the system is greatly reduced, and the purpose of energy-saving running all the year around is achieved.

And secondly, a spraying device is additionally arranged on the compressor and fluorine pump combined air conditioning system, and when the temperature difference between the outdoor dry bulb and the outdoor wet bulb is large, the outdoor dry bulb is precooled to be close to the temperature of the wet bulb through the spraying device, so that the energy consumption of the compressor can be reduced. And moreover, the spraying direction of the spraying device is countercurrent to the wind direction of the condensing fan, so that the contact time of spraying and air can be prolonged, the outdoor air inlet dry-bulb temperature can be more fully reduced, and the energy-saving effect can be further improved.

The control method provided by the invention can enable the system to be self-adaptively adjusted to a corresponding operation mode according to the outdoor environment temperature, thereby reducing the energy consumption of the system and enabling the system to achieve the purpose of energy-saving operation all the year around.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a compressor and fluorine pump combined air conditioning system provided by an embodiment of the invention.

The reference numbers illustrate:

1. a compressor; 2. an exhaust check valve; 3. a condenser; 4. a condensing fan; 5. a first filter; 6. a reservoir; 7. a first shut-off valve; 8. a fluorine pump; 9. a second stop valve; 10. a second filter; 11. a liquid viewing mirror; 12. a throttling element; 13. an evaporator; 14. an evaporation fan; 15. an air suction solenoid valve; 16. a first bypass branch; 161. a first check valve; 17. a second bypass branch; 171. a second one-way valve; 18. and (4) a spraying device.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

It will also be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Fig. 1 shows a compressor and fluorine pump combined air conditioning system according to an embodiment of the present invention.

Referring to fig. 1, the compressor and fluorine pump combined air conditioning system of the embodiment of the present invention includes a compressor 1, a condenser 3, a fluorine pump 8, a throttling element 12 and an evaporator 13, wherein the compressor 1, the condenser 3, the fluorine pump 8, the throttling element 12 and the evaporator 13 are sequentially connected to form a closed loop; the condenser 3 is provided with a condensing fan 4 and a spraying device 18, the spraying device 18 is arranged on the air inlet surface of the condenser 3, the spraying direction of the spraying device 18 is back to the condenser 3 and is in counter-current with the wind direction of the condensing fan 4; the compressor and fluorine pump combined air conditioning system further comprises a first bypass branch 16 and a second bypass branch 17, a first end of the first bypass branch 16 is connected with a pipeline between the evaporator 13 and the compressor 1, a second end of the first bypass branch 16 is connected with a pipeline between the compressor 1 and the condenser 3, a first check valve 161 is arranged on the first bypass branch 16, a first end of the second bypass branch 17 is connected with a pipeline between the condenser 3 and the fluorine pump 8, a second end of the second bypass branch 17 is connected with a pipeline between the fluorine pump 8 and the evaporator 13, and a second check valve 171 is arranged on the second bypass branch 17.

It is understood that the condenser 3 is disposed outdoors and the evaporator 13 is disposed indoors.

The compressor and fluorine pump composite air-conditioning system of the embodiment of the invention forms three working modes of a compressor refrigeration mode, a fluorine pump refrigeration mode and a mixed refrigeration mode by controlling the starting and stopping of the compressor 1 and the fluorine pump 8, wherein in the compressor refrigeration mode, the compressor 1 works and the fluorine pump 8 does not work; in the fluorine pump refrigeration mode, the compressor 1 does not work, and the fluorine pump 8 works; in the hybrid refrigeration mode, both the compressor 1 and the fluorine pump 8 are operated.

Further, when the compressor and fluorine pump combined air-conditioning system runs, the temperature difference between the outdoor dry bulb temperature and the outdoor wet bulb temperature is judged, if the temperature difference is larger than a preset temperature value, the spraying device 18 is started, and the outdoor dry bulb temperature is precooled to be close to the wet bulb temperature. Because the spraying direction of the spraying device 18 is in counter-current with the wind direction of the condensing fan 4, the contact time of the spraying and the air can be increased, and the outdoor air inlet dry bulb temperature can be more fully reduced.

Optionally, the preset value of the temperature difference between the outdoor dry bulb temperature and the outdoor wet bulb temperature is 5 ℃.

Optionally, an evaporation fan 14 is disposed on the evaporator 13, so that the heat exchange effect can be enhanced by forced convection.

Alternatively, the compressor 1 is controlled with a target of a refrigeration demand, which is the closeness of the supply/return air temperature calculated by the PID algorithm to the target temperature. When air supply temperature is lower, for preventing air supply side condensation from blowing water, set up in the control and prevented the condensation control, when detecting that air supply temperature is less than return air dew point temperature, compressor 1 falls the frenquency, and 14 liters of rotational speeds of evaporating fan improve air supply temperature, prevent that air supply temperature from crossing condensation and blowing water excessively.

Optionally, the fluorine pump 8 is a variable frequency fluorine pump 8. In the mixed refrigeration mode, the fluorine pump 8 is controlled by combining the target head (i.e., the pressure difference between the inlet and the outlet of the fluorine pump 8) and the condensing pressure, when the head is smaller than the target value, the rotation speed of the fluorine pump 8 is increased, and when the head is larger than the target value, the rotation speed of the fluorine pump 8 is decreased. When the ambient temperature is low, the evaporation pressure is low, the condensation pressure is also low, if the evaporation pressure is lower than 0.7MPa, the corresponding saturated evaporation temperature is lower than 0 ℃, and at this time, if condensed water is generated, the surface of the evaporator 13 will frost or even freeze. In order to increase the evaporation pressure, the condensing fan 4 is operated at a low speed or even not, and the compressor 1 is operated at a reduced speed.

In the fluorine pump refrigeration mode, the fluorine pump 8 is operated with a higher lift in the pure pump mode as a target, so that the condensation pressure in front of the throttling element 12 is increased, thereby increasing the evaporation pressure and the corresponding saturated evaporation temperature, and avoiding the surface of the evaporator 13 from frosting or freezing.

Alternatively, the throttling element 12 is an electronic expansion valve, and the electronic expansion valve has higher adjusting capacity and adjusting precision compared with other throttling devices such as a thermal expansion valve and a capillary tube, and can better control the suction superheat degree of the compressor 1.

The compressor and fluorine pump combined air-conditioning system provided by the embodiment of the invention has the following advantages:

firstly, the compressor and fluorine pump combined air-conditioning system of the embodiment of the invention forms three working modes of a compressor refrigeration mode, a fluorine pump refrigeration mode and a mixed refrigeration mode by controlling the starting and stopping of the compressor 1 and the fluorine pump 8, and the air-conditioning system operates the compressor refrigeration mode in high-temperature seasons in summer; in spring and autumn transition seasons, the air conditioning system operates a mixed refrigeration mode, the condensation pressure of the compressor 1 is reduced, the pressure in front of the throttling element 12 is increased by pressurizing through the fluorine pump 8, the flow rate of a refrigerant is increased, and the required refrigeration capacity is achieved; in winter at low temperature, the air conditioning system operates a fluorine pump refrigeration mode, a free natural cold source is completely utilized to provide required refrigeration capacity, the energy consumption of the air conditioner is greatly reduced, and the purpose of energy-saving operation all the year around is achieved.

Secondly, the spraying device 18 is additionally arranged in the compressor and fluorine pump composite air-conditioning system, when the temperature difference between the outdoor dry bulb and the outdoor wet bulb is large, the outdoor dry bulb is precooled to be close to the temperature of the wet bulb through the spraying device 18, and therefore the energy consumption of the compressor 1 can be reduced. In addition, the spraying direction of the spraying device 18 is in counter-current with the wind direction of the condensing fan 4, so that the contact time between the spraying and the air can be prolonged, the outdoor air inlet dry-bulb temperature can be more fully reduced, and the energy-saving effect can be further improved.

Referring to fig. 1, for example, in some embodiments, the compressor and fluorine pump combined air conditioning system further includes a suction solenoid valve 15, and the suction solenoid valve 15 is disposed at a suction end of the compressor 1. When the pure pump mode of operation, there is the hydrops risk compressor 1 suction end, and compressor 1 takes liquid to start easily when starting, causes compressor 1 liquid to hit the damage. According to the air conditioning system, the air suction electromagnetic valve 15 is arranged at the air suction end of the compressor 1, and the air suction electromagnetic valve 15 and the compressor 1 are opened and closed simultaneously, so that liquid refrigerants are prevented from being accumulated at the air suction end of the compressor 1, and the risk of liquid carrying during starting of the compressor 1 is eliminated.

Further, the compressor and fluorine pump combined air conditioning system further comprises an exhaust check valve 2, and the exhaust check valve 2 is arranged between the compressor 1 and the condenser 3.

On this basis, a first end of the first bypass branch 16 is disposed between the suction solenoid valve 15 and the evaporator 13, and a second end of the first bypass branch 16 is disposed between the discharge check valve 2 and the condenser 3.

Referring to fig. 1, for example, in some embodiments, the compressor and fluorine pump combined air conditioning system further includes a first stop valve 7 and a second stop valve 9, the first stop valve 7 is disposed at an inlet end of the fluorine pump 8, the second stop valve 9 is disposed at an outlet end of the fluorine pump 8, and the first stop valve 7 is disposed at the inlet end of the fluorine pump 8 and the second stop valve 9 is disposed at the outlet end of the fluorine pump 8, so that the fluorine pump 8 can be replaced and maintained online without stopping the whole air conditioning system and without discharging all refrigerants of the unit, thereby greatly reducing maintenance cost. When the fluorine pump 8 breaks down, start the refrigeration of compressor 1, the refrigerant circulates through second check valve 171, fluorine pump 8, first stop valve 7 and second stop valve 9 are fallen by the bypass, close first stop valve 7 and second stop valve 9, put down the refrigerant in the fluorine pump 8 through the needle valve, can change fluorine pump 8, the fluorine pump 8 is changed and is accomplished the back and finish and locate the evacuation to fluorine pump 8 through the needle valve, mend behind the refrigerant, open first stop valve 7 and second stop valve 9, can accomplish the maintenance.

On this basis, a first end of the second bypass branch 17 is arranged between the first shut-off valve 7 and the condenser 3, and a second end of the second bypass branch 17 is arranged between the second shut-off valve 9 and the throttle element 12.

Referring to fig. 1, for example, in some embodiments, the compressor and fluorine pump combined air conditioning system further includes an accumulator 6, the accumulator 6 is disposed between the condenser 3 and the fluorine pump 8, and the accumulator 6 can perform functions of storage, gas-liquid separation, noise reduction, refrigerant buffering, and the like in the system, thereby improving the stability of the system operation.

Referring to fig. 1, for example, in some embodiments, the compressor and fluorine pump combined air conditioning system further includes a first filter 5, the first filter 5 is disposed between the condenser 3 and the liquid accumulator 6, and by disposing the first filter 5, impurities in the refrigerant can be filtered, so as to prevent the impurities from entering the fluorine pump and causing damage to the fluorine pump.

Furthermore, the compressor and fluorine pump combined air conditioning system further comprises a second filter 10, the second filter 10 is arranged between the fluorine pump 8 and the throttling element 12, and the second filter 10 can absorb moisture and impurities in the refrigerant, so that the problems of 'dirty blockage' or 'ice blockage' and the like in the operation process of the air conditioning system are prevented, and the operation reliability of the air conditioning system is improved.

Referring to fig. 1, for example, in some embodiments, the compressor and fluorine pump combined air conditioning system further includes a liquid viewing mirror 11, the liquid viewing mirror 11 is disposed between the fluorine pump 8 and the throttling element 12, and the liquid viewing mirror 11 is disposed to help a maintenance worker to know information such as quality and water content of refrigerant in the circulation pipeline, so as to improve maintenance efficiency.

In one embodiment, the work flows of the compressor refrigeration mode, the fluorine pump refrigeration mode and the hybrid refrigeration mode of the compressor and fluorine pump combined air conditioning system in all three work modes are as follows:

the working flow of the refrigeration mode of the compressor is as follows:

compressor cooling mode:

the first check valve 161 is closed, the fluorine pump 8 is closed, the second check valve 171 is opened, the compressor 1 is opened, the suction solenoid valve 15 is opened, the compressor 1, the discharge check valve 2, the condenser 3, the first filter 5, the reservoir 6, the second bypass branch 17, the second filter 10, the throttling element 12, the evaporator 13 and the suction solenoid valve 15 form a closed loop, and after flowing out from the compressor 1, the refrigerant passes through the discharge check valve 2, the condenser 3, the first filter 5, the reservoir 6, the second bypass branch 17, the second filter 10, the throttling element 12, the evaporator 13 and the suction solenoid valve 15 in sequence, and then returns to the compressor 1 to complete the refrigeration cycle.

Specifically, the compressor 1 highly compresses the refrigerant circulating from the evaporator 13, compresses the gaseous refrigerant into a high-temperature and high-pressure gas state, sends the gas state to the condenser 3, and dissipates heat to obtain a medium-temperature and high-pressure liquid refrigerant. The liquid refrigerant can be further depressurized and cooled through the throttling element 12 to be changed into a low-pressure and low-temperature gas-liquid mixed state, and then enters the evaporator 13, the gas-liquid two-phase refrigerant is vaporized in the evaporator 13, and the refrigerant absorbs a large amount of heat in the phase change process from the liquid state to the gas state, so that the refrigeration of the environment in the machine room is realized. The refrigerant from the evaporator 13 becomes a superheated gaseous state and the gaseous refrigerant is returned to the compressor 1 to continue the cycle.

A fluorine pump refrigeration mode:

the second check valve 171 is closed, the compressor 1 is closed, the suction solenoid valve 15 is closed, the first check valve 161 is opened, the fluorine pump 8 is opened, the condenser 3, the first filter 5, the accumulator 6, the fluorine pump 8, the second filter 10, the throttling element 12, the evaporator 13 and the first bypass branch 16 form a closed circuit, and the refrigerant flows out of the fluorine pump 8, passes through the second stop valve 9, the second filter 10, the throttling element 12, the evaporator 13, the first bypass branch 16, the condenser 3, the first filter 5, the accumulator 6 and the first stop valve 7 in sequence, and then returns to the fluorine pump 8 to complete the refrigeration cycle.

Under the action of the fluorine pump 8, the refrigerant with lower temperature flows through the evaporator 13, the refrigerant is vaporized in the evaporator 13 to absorb indoor heat, so as to realize the refrigeration effect on the indoor environment, then the gaseous refrigerant with increased temperature due to heat absorption flows through the condenser 3 arranged outdoors, and because the outdoor environment temperature is lower and the temperature of the refrigerant in the condenser 3 is higher than the outdoor environment temperature, a certain temperature gradient exists, so that the absorbed heat can be emitted outdoors through the condenser 3, and the refrigerant with reduced temperature and condensed into liquid state returns to the fluorine pump 8 to continue circulation. The fluorine pump 8 is used for supplying power to the system circulation instead of the compressor 1, and the power of the fluorine pump 8 is far less than that of the compressor 1, so that the energy-saving effect is remarkable.

A mixed refrigeration mode:

the first bypass branch 16 is closed, the second bypass branch 17 is closed, the compressor 1 is opened, the fluorine pump 8 is opened, the compressor 1, the exhaust check valve 2, the condenser 3, the first filter 5, the accumulator 6, the first stop valve 7, the fluorine pump 8, the second stop valve 9, the second filter 10, the throttling element 12, the evaporator 13 and the suction solenoid valve 15 form a closed loop, and after flowing out of the compressor 1, the refrigerant passes through the exhaust check valve 2, the condenser 3, the first filter 5, the accumulator 6, the first stop valve 7, the fluorine pump 8, the second stop valve 9, the second filter 10, the throttling element 12, the evaporator 13 and the suction solenoid valve 15 in sequence, and then returns to the compressor 1 to complete the refrigeration cycle.

When the compressor and fluorine pump combined air conditioning system operates, the temperature difference between the outdoor dry bulb temperature and the outdoor wet bulb temperature needs to be judged, and if the temperature difference is larger than the preset temperature value, the spraying device 18 is started to pre-cool the outdoor dry bulb temperature to be close to the wet bulb temperature.

The embodiment of the invention also provides a control method for the compressor and fluorine pump combined air-conditioning system, which comprises the following steps:

judging whether the outdoor environment temperature is higher than a first preset temperature, if so, operating a compressor refrigeration mode by the compressor and fluorine pump composite air-conditioning system, if not, judging whether the outdoor environment temperature is lower than a second preset temperature, if so, operating a fluorine pump refrigeration mode by the compressor and fluorine pump composite air-conditioning system, and if not, operating a mixed refrigeration mode by the compressor and fluorine pump composite air-conditioning system;

and judging whether the temperature difference between the outdoor dry bulb temperature and the outdoor wet bulb temperature is greater than a preset temperature difference value or not, if so, starting the spraying device 18, and if not, closing the spraying device 18.

In the embodiment of the present invention, the first preset temperature is 25 ℃, and the second preset temperature is 5 ℃.

The first preset temperature and the second preset temperature may be adjusted according to actual conditions, and are only used as examples. Generally, in hot summer seasons, an air conditioning system operates a compressor cooling mode; in spring and autumn transition seasons, the air conditioning system operates a mixed refrigeration mode; in winter in low temperature season, the air conditioning system operates the fluorine pump refrigeration mode.

It can be understood that the air conditioning system can automatically switch the operation mode according to the control method, and the operation mode of the air conditioning system can be manually switched by a human.

The control method of the embodiment of the invention can enable the system to be self-adaptively adjusted to the corresponding operation mode according to the outdoor environment temperature, thereby reducing the energy consumption of the system and enabling the system to achieve the purpose of energy-saving operation all the year around.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.

Claims (10)

1. The compressor and fluorine pump combined air conditioning system is characterized by comprising a compressor, a condenser, a fluorine pump, a throttling element and an evaporator, wherein the compressor, the condenser, the fluorine pump, the throttling element and the evaporator are sequentially connected to form a closed loop; the condenser is provided with a condensing fan and a spraying device, the spraying device is arranged on the air inlet surface of the condenser, and the spraying direction of the spraying device is back to the condenser and is in counter-current with the wind direction of the condensing fan; the compressor and fluorine pump composite air conditioning system further comprises a first bypass branch and a second bypass branch, a first end of the first bypass branch is connected with a pipeline between the evaporator and the compressor, a second end of the first bypass branch is connected with a pipeline between the compressor and the condenser, a first check valve is arranged on the first bypass branch, a first end of the second bypass branch is connected with a pipeline between the condenser and the fluorine pump, a second end of the second bypass branch is connected with a pipeline between the fluorine pump and the evaporator, and a second check valve is arranged on the second bypass branch.

2. The compressor and fluorine pump combined air conditioning system according to claim 1, further comprising a suction solenoid valve disposed at a suction end of said compressor.

3. The compressor and fluorine pump combined air conditioning system according to claim 1, further comprising a discharge check valve disposed between said compressor and said condenser.

4. The compressor and fluorine pump combined air conditioning system as recited in claim 1 further comprising a first shut-off valve disposed at an inlet end of said fluorine pump and a second shut-off valve disposed at an outlet end of said fluorine pump.

5. The compressor and fluorine pump combined air conditioning system as recited in claim 1, further comprising an accumulator disposed between said condenser and said fluorine pump.

6. The compressor and fluorine pump combination air conditioning system as recited in claim 5, further comprising a first filter disposed between said condenser and said accumulator.

7. The compressor and fluorine pump combined air conditioning system according to claim 6, further comprising a second filter disposed between said fluorine pump and said throttling element.

8. The compressor and fluorine pump combined air conditioning system as claimed in claim 1, further comprising a sight glass disposed between the fluorine pump and the throttling element.

9. The compressor and fluorine pump combined air conditioning system as claimed in claim 1, wherein an evaporation fan is provided on the evaporator.

10. A control method for a compressor and fluorine pump combined air conditioning system as claimed in any one of claims 1 to 9,

the compressor and fluorine pump combined air-conditioning system comprises a compressor refrigeration mode, a fluorine pump refrigeration mode and a mixed refrigeration mode; the compressor and fluorine pump combined air-conditioning system operates in the compressor refrigeration mode, the compressor and the second check valve are opened, and the fluorine pump and the first check valve are closed; the compressor and fluorine pump composite air conditioning system operates the fluorine pump refrigeration mode, the fluorine pump and the first check valve are opened, and the compressor and the second check valve are closed; the compressor and fluorine pump combined air-conditioning system operates in the mixed refrigeration mode, the compressor and the fluorine pump are started, and the first check valve and the second check valve are closed;

the control method comprises the following steps: judging whether the outdoor environment temperature is greater than a first preset temperature, if so, operating the compressor refrigeration mode by the compressor and fluorine pump composite air-conditioning system, otherwise, judging whether the outdoor environment temperature is lower than a second preset temperature, if so, operating the fluorine pump refrigeration mode by the compressor and fluorine pump composite air-conditioning system, and if not, operating the hybrid refrigeration mode by the compressor and fluorine pump composite air-conditioning system;

and judging whether the temperature difference between the outdoor dry bulb temperature and the outdoor wet bulb temperature is greater than a preset temperature difference value, if so, starting the spraying device, and if not, closing the spraying device.

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