An air conditioning system, a rail vehicle, a dehumidification method, a defrosting method

Abstract

The application discloses a kind of air conditioning system, railway vehicle, dehumidification method, defrosting method, it is related to air conditioning equipment technical field, air conditioning system includes fresh air valve, evaporator, first energy transfer device, ventilator, air outlet, compressor, condenser, second energy transfer device, four-way valve, first solenoid valve and second solenoid valve, second energy transfer device is adjacent with condenser;Gas enters by fresh air valve and sequentially flows through evaporator, first energy transfer device, ventilator, air outlet into passenger room;First energy transfer device is parallel with condenser;Second energy transfer device is parallel with evaporator.The air conditioning system provided by the application realizes the dehumidification, defrosting function of air conditioning system under the premise of not increasing energy consumption, reduces energy consumption, and is low in cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning equipment, in particular to an air conditioning system. BACKGROUND

[0002] When the air conditioner is used for refrigeration in summer, part of the water vapor in the air is cooled and frosted on the evaporator of the air conditioner, and is collected by the water pan and discharged to the outside of the vehicle; in low temperature and high humidity weather, the refrigeration capacity demand of the vehicle is reduced, and when the temperature in the vehicle is reduced to the control target value, the compressor works at low frequency or intermittently, at this time, the surface temperature of the evaporator is relatively increased, the dehumidification capacity of the evaporator is reduced, and the humidity in the vehicle is increased, and the riding comfort is reduced.

[0003] In the related art, an electric heater is arranged in the unit, the air supply is cooled to below the required temperature by the air conditioner evaporator, so that more water vapor in the air supply is condensed and dew condensation, and then the air is heated to a suitable temperature by the electric heating to meet the temperature demand in the vehicle. For the rail vehicle without secondary heating demand, if the air conditioner wants to dehumidify independently, an electric heater must be arranged, the use frequency of the electric heater is low, and the energy consumption is high, which causes the capacity of the auxiliary power supply of the train to increase, and the cost of the vehicle increases.

[0004] In summary, how to provide an air conditioning system which can independently dehumidify and defrost at low cost is a problem to be solved by the technical personnel in the field at present. SUMMARY

[0005] Therefore, the purpose of the present application is to provide an air conditioning system, by connecting the first energy transfer device in parallel with the condenser and connecting the second energy transfer device in parallel with the evaporator, the dehumidification and defrosting functions of the air conditioning system are realized without increasing the energy consumption, the energy consumption is reduced, and the cost is low.

[0006] Another purpose of the present application is to provide a rail vehicle comprising the above-mentioned air conditioning system and a dehumidification method and defrosting method suitable for the above-mentioned air conditioning system.

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] An air conditioning system, comprising a fresh air valve, an evaporator, a first energy transfer device, a ventilator, an air supply outlet, a compressor, a condenser, a second energy transfer device, a four-way valve, a first electromagnetic valve and a second electromagnetic valve, the second energy transfer device is arranged adjacent to the condenser;

[0009] The gas enters the fresh air valve and flows through the evaporator, the first energy transfer device, the ventilator and the air supply outlet into the passenger compartment in sequence;

[0010] The four interfaces of the four-way valve are connected to the inlet of the compressor, the outlet of the compressor, the condenser and the evaporator respectively;

[0011] The first energy transfer device is connected in parallel with the condenser, and the first electromagnetic valve is used to control whether the refrigerant flowing out of the condenser enters the first energy transfer device; the second energy transfer device is connected in parallel with the evaporator, and the second electromagnetic valve is used to control whether the refrigerant flowing out of the evaporator enters the second energy transfer device;

[0012] The condenser and the evaporator are connected through a throttling device.

[0013] Optionally, the first energy transfer device is a first heat sink, and the second energy transfer device is a second heat sink.

[0014] Optionally, the first energy transfer device is a first loop heat pipe, the heat absorption end of the first loop heat pipe is arranged on a pipeline connecting the condenser and the throttling device, and the heat dissipation end of the first loop heat pipe is arranged on the air inlet side of the ventilator. The gas flows through the evaporator, the heat dissipation end of the first loop heat pipe, the ventilator and the air outlet into the guest room in sequence.

[0015] The second energy transfer device is a second loop heat pipe, the heat absorption end of the second loop heat pipe is arranged on a pipeline connecting the evaporator and the throttling device, and the heat dissipation end of the second loop heat pipe is arranged adjacent to the condenser.

[0016] Optionally, a first resistance pipe and a second resistance pipe are further included, the first resistance pipe is connected in parallel with the pipeline connecting the condenser and the throttling device, and the second resistance pipe is connected in parallel with the pipeline connecting the evaporator and the throttling device.

[0017] Optionally, a first temperature sensor, a return air temperature sensor, a return air humidity sensor and a controller are further included, the first temperature sensor is used to detect the temperature of the surface of the condenser, the first temperature sensor, the return air temperature sensor and the return air humidity sensor are all connected with the controller; the return air temperature sensor and the return air humidity sensor are both arranged at the return air outlet of the guest room.

[0018] Optionally, a fresh air temperature sensor and a fresh air humidity sensor are arranged at the outlet of the fresh air valve, and the fresh air temperature sensor and the fresh air humidity sensor are both connected with the controller.

[0019] And / or, a second temperature sensor is further included, the second temperature sensor is used to detect the temperature of the surface of the evaporator, and the second temperature sensor is connected with the controller.

[0020] Optionally, the air conditioning system further comprises a first supply air temperature sensor and a second supply air temperature sensor, the first supply air temperature sensor is arranged at an air inlet of the first energy transfer device, and the second supply air temperature sensor is arranged at the air outlet.

[0021] A rail vehicle, characterized by comprising the air conditioning system according to any one of the preceding items.

[0022] A dehumidification method suitable for the air conditioning system, the dehumidification method comprising:

[0023] obtaining humidity data of the passenger compartment;

[0024] determining whether the humidity data is greater than a preset humidity value, if yes, controlling the compressor to increase the working frequency or controlling the number of the compressor working in the air conditioning system to be increased, and if no, returning to the previous step.

[0025] A defrosting method suitable for the air conditioning system, the defrosting method comprising:

[0026] obtaining temperature data of a surface of the condenser;

[0027] determining whether the temperature data is lower than a preset temperature value, if yes, controlling the compressor to increase the working frequency or controlling the number of the compressor working in the air conditioning system to be increased, and if no, returning to the previous step.

[0028] In the process of using the air conditioning system provided by the application, in the refrigeration season, the second electromagnetic valve is in a normally closed state, when the humidity in the passenger compartment is higher than a preset value, the working frequency of the compressor is increased or more compressors are put into work, so that the surface temperature of the evaporator is reduced, thereby causing more water vapor to flow through the evaporator to form frost, which is collected by the water pan and discharged to the outside of the vehicle. At the same time, the first electromagnetic valve is opened, so that the high-temperature and high-pressure refrigerant flowing out of the compressor flows into the condenser and the first energy transfer device, the gas enters the vehicle through the fresh air valve, and sequentially flows through the evaporator, the first energy transfer device, the ventilator and the air outlet into the passenger compartment. Since the surface temperature of the evaporator is relatively low, the gas is heated when flowing through the first energy transfer device, thereby realizing heating of the supply air after dehumidification and ensuring that the temperature in the vehicle is within a target range.

[0029] In the heating season, the first electromagnetic valve is in a normally closed state, when the surface temperature of the condenser is lower than a preset temperature, the working frequency of the compressor is increased or more compressors are put into work, and the second electromagnetic valve is opened. The high-temperature and high-pressure refrigerant flowing out of the compressor enters the evaporator and the second energy transfer device. Since the second energy transfer device is arranged adjacent to the condenser, heating of the condenser can be realized, so that the surface temperature of the condenser is increased to avoid frost formation or defrosting of the condenser.

[0030] Compared with the prior art, the air conditioning system provided by the application realizes the dehumidification and defrosting functions of the air conditioning system without increasing energy consumption, reduces energy consumption, and is low in cost.

[0031] In addition, the application also provides a railway vehicle comprising the air conditioning system and a dehumidification method and a defrosting method suitable for the air conditioning system. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative effort on the basis of the provided drawings.

[0033] Figure 1 a schematic diagram of the dehumidification state of the specific embodiment one of the air conditioning system provided by the application;

[0034] Figure 2 a schematic diagram of the defrosting state of the specific embodiment one of the air conditioning system provided by the application;

[0035] Figure 3 a schematic diagram of the dehumidification state of the specific embodiment two of the air conditioning system provided by the application;

[0036] Figure 4 a schematic diagram of the defrosting state of the specific embodiment two of the air conditioning system provided by the application.

[0037] Figures 1-4 In the drawings:

[0038] 1 is a controller, 2 is a fresh air valve, 3 is an evaporator, 41 is a first heat radiator, 42 is a heat absorption end of a first loop heat pipe, 43 is a heat dissipation end of the first loop heat pipe, 5 is a ventilator, 6 is a supply air outlet, 7 is a compressor, 8 is a condenser, 91 is a second heat radiator, 92 is a heat absorption end of a second loop heat pipe, 93 is a heat dissipation end of the second loop heat pipe, 10 is a first electromagnetic valve, 11 is a second electromagnetic valve, 12 is a first resistance pipe, 13 is a second resistance pipe, 14 is a first temperature sensor, 15 is a fresh air temperature sensor, 16 is a fresh air humidity sensor, 17 is a second temperature sensor, 18 is a first supply air temperature sensor, 19 is a second supply air temperature sensor, 20 is a return air temperature sensor, 21 is a return air humidity sensor, 22 is an air conditioning unit, 23 is a passenger compartment, 24 is a return air inlet, 25 is a four-way valve, and 26 is a throttling device. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0040] The core of the present application is to provide an air conditioning system, by connecting the first energy transfer device in parallel with the condenser and connecting the second energy transfer device in parallel with the evaporator, the dehumidification and defrosting functions of the air conditioning system are realized without increasing energy consumption, the energy consumption is reduced, and the cost is low. Another core of the present application is to provide a railway vehicle comprising the above-mentioned air conditioning system and a dehumidification method and a defrosting method suitable for the above-mentioned air conditioning system.

[0041] Please refer to Figures 1 to 4 .

[0042] The specific embodiment discloses an air conditioning system, comprising a fresh air valve 2, an evaporator 3, a first energy transfer device, a ventilator 5, an air outlet 6, a compressor 7, a condenser 8, a second energy transfer device, a four-way valve 25, a first electromagnetic valve 10 and a second electromagnetic valve 11, the second energy transfer device is arranged adjacent to the condenser 8; gas enters from the fresh air valve 2 and flows through the evaporator 3, the first energy transfer device, the ventilator 5 and the air outlet 6 into the passenger compartment 23 in sequence; the four interfaces of the four-way valve 25 are connected with the inlet of the compressor 7, the outlet of the compressor 7, the condenser 8 and the evaporator 3 respectively; the first energy transfer device is connected in parallel with the condenser 8, the first electromagnetic valve 10 is used for controlling whether the refrigerant flowing out of the condenser 8 enters the first energy transfer device; the second energy transfer device is connected in parallel with the evaporator 3, the second electromagnetic valve 11 is used for controlling whether the refrigerant flowing out of the evaporator 3 enters the second energy transfer device; the condenser 8 and the evaporator 3 are connected through a throttling device 26.

[0043] In the process of using the air conditioning system provided by the specific embodiment, in the refrigeration season, the second electromagnetic valve 11 is in a normally closed state, when the humidity in the passenger compartment 23 is higher than a preset value, the working frequency of the compressor 7 is increased or more compressors 7 are put into work, so that the surface temperature of the evaporator 3 is reduced, thereby more water vapor flows through the evaporator 3 to form frost, which is collected by a water pan and discharged to the outside of the vehicle. At the same time, the first electromagnetic valve 10 is opened, so that the high-temperature and high-pressure refrigerant flowing out of the compressor 7 flows into the condenser 8 and the first energy transfer device, the gas enters the vehicle from the fresh air valve 2 and flows through the evaporator 3, the first energy transfer device, the ventilator 5 and the air outlet 6 into the passenger compartment 23 in sequence, because the surface temperature of the evaporator 3 is low, the gas is heated when flowing through the first energy transfer device, air heating after dehumidification is realized, and the temperature in the vehicle is ensured to be in a target range.

[0044] During the heating season, the first solenoid valve 10 is normally closed. When the surface temperature of the condenser 8 is lower than the preset temperature, the operating frequency of the compressor 7 increases or more compressors 7 are put into operation. The second solenoid valve 11 opens, and the high-temperature and high-pressure refrigerant flowing out of the compressor 7 enters the evaporator 3 and the second energy transfer device. Since the second energy transfer device is set adjacent to the condenser 8, it can heat the condenser 8, raise the surface temperature of the condenser 8, and prevent the condenser 8 from frosting or achieve defrosting.

[0045] Compared to existing technologies, the air conditioning system provided in this specific embodiment achieves dehumidification and defrosting functions without increasing energy consumption, thereby reducing energy consumption and lowering costs.

[0046] In one specific embodiment, the first energy transfer device is a first heat sink 41, and the second energy transfer device is a second heat sink 91, such as... Figure 1 As shown, during the cooling season, the second solenoid valve 11 is normally closed. When the humidity in the passenger compartment 23 is higher than the preset humidity value (which can be 65% or other values ​​that meet the requirements), the operating frequency of the compressor 7 will be increased or more compressors 7 will be put into operation to achieve the dehumidification effect. This will lower the temperature of the evaporator 3 surface, causing water vapor to frost on the surface of the evaporator 3 as it flows through it. At the same time, the first solenoid valve 10 opens, and part of the high-temperature and high-pressure refrigerant flowing out of the compressor 7 enters the condenser 8, passes through the throttling device 26, enters the evaporator 3, and flows back to the compressor 7 from the evaporator 3. The other part enters the first radiator 41, where it exchanges heat with the gas flowing through it, heating the gas and preventing it from getting too cold. This ensures that the temperature in the passenger compartment 23 is within the target control range.

[0047] During the heating season, such as Figure 2 As shown, the first solenoid valve 10 is normally closed. When the surface temperature of the condenser 8 is lower than the preset temperature value, the preset temperature value is a pre-set temperature value, which can be 2℃ or other values ​​that meet the requirements. The specific value is determined according to the actual situation and will not be elaborated here. The second solenoid valve 11 is opened, and part of the high-temperature and high-pressure refrigerant flowing out of the compressor 7 flows into the evaporator 3 and then flows through the throttling device 26 and the condenser 8 in sequence before flowing back to the compressor 7. Another part of the refrigerant flows into the second radiator 91 and exchanges heat in the second radiator 91. Since the second radiator 91 is adjacent to the condenser 8 and is close to it, the second radiator 91 heats the condenser 8, which raises the temperature of the condenser 8 and can effectively prevent the condenser 8 from frosting or melt the frost on the surface of the condenser 8.

[0048] In a specific embodiment, the first energy transfer device is a first loop heat pipe, the heat absorbing end 42 of the first loop heat pipe is arranged in the pipeline connecting the condenser 8 and the throttling device 26, and the heat dissipating end 43 of the first loop heat pipe is arranged at the air inlet side of the ventilator 5. The gas flows through the evaporator 3, the heat dissipating end 43 of the first loop heat pipe, the ventilator 5, and the air outlet 6 in sequence to enter the passenger compartment 23. The second energy transfer device is a second loop heat pipe, the heat absorbing end 92 of the second loop heat pipe is arranged in the pipeline connecting the evaporator 3 and the throttling device 26, and the heat dissipating end 93 of the second loop heat pipe is arranged adjacent to the condenser 8.

[0049] Specifically, the first resistance pipe 12 and the second resistance pipe 13 can be arranged. The first resistance pipe 12 is connected in parallel with the pipeline connecting the condenser 8 and the throttling device 26, and the second resistance pipe 13 is connected in parallel with the pipeline connecting the evaporator 3 and the throttling device 26. In the refrigeration season, the high-temperature and high-pressure refrigerant flowing out of the compressor 7 can flow into the pipeline connecting the condenser 8 and the throttling device 26 and connected in parallel with the pipeline in which the first resistance pipe 12 is arranged. In the heating season, the high-temperature and high-pressure refrigerant flowing out of the compressor 7 can flow into the pipeline connecting the evaporator 3 and the throttling device 26 and connected in parallel with the pipeline in which the second resistance pipe 13 is arranged.

[0050] In the specific embodiment, as shown in Figure 3 In the refrigeration season, the second electromagnetic valve 11 is in a normally closed state. When the humidity in the passenger compartment 23 is higher than a preset humidity value, the preset humidity value is a preset value, which can be 65% or other values meeting the requirements. In order to achieve the dehumidification effect, the working frequency of the compressor 7 is increased or more compressors 7 are put into operation, so that the temperature of the surface of the evaporator 3 is reduced, and the water vapor flowing through the evaporator 3 is frozen on the surface of the evaporator 3. At the same time, the first electromagnetic valve 10 is opened, the high-temperature and high-pressure refrigerant flowing out of the compressor 7 enters the condenser 8, passes through the throttling device 26 to enter the evaporator 3, and flows back to the compressor 7 from the evaporator 3. Since the heat absorbing end 42 of the first loop heat pipe is arranged in the pipeline connecting the condenser 8 and the throttling device 26, the refrigerant flowing through the pipeline connecting the condenser 8 and the throttling device 26 exchanges heat with the heat absorbing end 42 of the first loop heat pipe, so that the temperature of the heat absorbing end 42 of the first loop heat pipe is increased, the temperature of the heat dissipating end 43 of the first loop heat pipe is increased, and the gas flowing through the heat dissipating end 43 of the first loop heat pipe is heated, so as to avoid that the temperature of the gas is too low, to heat the gas after dehumidification, and to ensure that the temperature in the passenger compartment 23 is within the target control range.

[0051] In the heating season, as shown in Figure 4As shown, the first electromagnetic valve 10 is in a normally closed state, when the surface temperature of the condenser 8 is lower than a preset temperature value, the preset temperature value is a temperature value set in advance, which can be 2℃, or other values meeting the requirements, and is determined according to the actual situation, which is not described here; the second electromagnetic valve 11 is opened, the high-temperature and high-pressure refrigerant flowing out of the compressor 7 flows into the evaporator 3, and then flows through the throttling device 26 and the condenser 8 to flow back to the compressor 7. Since the heat absorption end 92 of the second loop heat pipe is arranged on the pipeline connecting the evaporator 3 and the throttling device 26, the refrigerant exchanges heat at the heat absorption end 92 of the second loop heat pipe, releases heat, and raises the temperature of the heat absorption end 92 of the second loop heat pipe. At the same time, the temperature of the heat dissipation end 93 of the second loop heat pipe is raised. Since the heat dissipation end 93 of the second loop heat pipe is arranged adjacent to the condenser 8 and is close to the condenser 8, the heat dissipation end 93 of the second loop heat pipe heats the condenser 8, which raises the temperature of the condenser 8, and can effectively prevent the condenser 8 from frosting or melt the frost on the surface of the condenser 8.

[0052] In a specific embodiment, the system comprises a first temperature sensor 14, a fresh air temperature sensor 15, a fresh air humidity sensor 16, a second temperature sensor 17, a first supply air temperature sensor 18, a second supply air temperature sensor 19, a return air temperature sensor 20, a return air humidity sensor 21, and a controller 1. The first temperature sensor 14, the fresh air temperature sensor 15, the fresh air humidity sensor 16, the second temperature sensor 17, the first supply air temperature sensor 18, the second supply air temperature sensor 19, the return air temperature sensor 20, and the return air humidity sensor 21 are connected to the controller 1. The first temperature sensor 14 is used to detect the temperature of the surface of the condenser 8. The fresh air temperature sensor 15 is used to detect the temperature at the outlet of the fresh air valve 2. The fresh air humidity sensor 16 is used to detect the humidity at the outlet of the fresh air valve 2. The second temperature sensor 17 is used to detect the temperature of the surface of the evaporator 3. The first supply air temperature sensor 18 is used to detect the temperature at the inlet of the first energy transfer device. The second supply air temperature sensor 19 is used to detect the temperature at the supply air outlet 6. The return air temperature sensor 20 is used to detect the temperature at the return air outlet 24 of the guest room 23. The return air humidity sensor 21 is used to detect the humidity at the return air outlet 24 of the guest room 23.

[0053] In the process of specific use, in the refrigeration season, the second electromagnetic valve 11 is in the normally closed state, when the return air humidity sensor 21 detects that the humidity in the passenger room 23 is higher than the preset humidity value, the controller 1 controls to increase the working frequency of the compressor 7 or put more number of compressors 7 into work, at this time, the second temperature sensor 17 detects that the temperature of the surface of the evaporator 3 is reduced, the first supply air temperature sensor 18 detects that the temperature at the inlet of the first energy transfer device is reduced, the water vapor flows through the evaporator 3, and frost is formed on the surface of the evaporator 3, at the same time, the first electromagnetic valve 10 is opened, the high-temperature and high-pressure refrigerant flowing out of the compressor 7 enters the condenser 8, and then enters the evaporator 3 through the throttling device 26, the high-temperature and high-pressure refrigerant flowing out of the compressor 7 exchanges heat with the first energy transfer device, the first energy transfer device absorbs the heat of the refrigerant, and heats the gas flowing through the first energy transfer device, the second supply air temperature sensor 19 detects that the temperature at the supply air outlet 6 is increased, so as to avoid that the temperature of the gas is too low, realize heating of the gas after dehumidification, and ensure that the temperature in the passenger room 23 is within the target control range.

[0054] The return air temperature sensor 20 is used for detecting the temperature at the return air outlet 24 of the passenger room 23, and the return air humidity sensor 21 is used for detecting the humidity at the return air outlet 24 of the passenger room 23, so as to monitor the temperature and humidity in the passenger room 23 in real time, the fresh air temperature sensor 15 at the outlet of the fresh air valve 2 is used for detecting the temperature at the outlet of the fresh air valve 2, and the fresh air humidity sensor 16 is used for detecting the humidity at the outlet of the fresh air valve 2, so as to make timely adjustment according to the changes of the temperature and humidity of the incoming fresh air.

[0055] In the heating season, the first electromagnetic valve 10 is in the normally closed state, when the first temperature sensor 14 detects that the temperature of the surface of the condenser 8 is lower than the preset temperature value, the second electromagnetic valve 11 is opened, the high-temperature and high-pressure refrigerant flowing out of the compressor 7 flows into the evaporator 3, and then flows through the throttling device 26 and the condenser 8 to flow back to the compressor 7, since the second energy transfer device is connected in parallel with the evaporator 3, the refrigerant exchanges heat with the second energy transfer device, so that the temperature of the second energy transfer device is increased, the second energy transfer device transmits heat to the condenser 8, heats the condenser 8, and increases the temperature of the condenser 8, which can effectively prevent the condenser 8 from frosting or melt the frost on the surface of the condenser 8.

[0056] In addition to the air conditioning system described above, the present application also provides a railway vehicle comprising the air conditioning system disclosed in the above embodiment, the railway vehicle is provided with the air conditioning unit 22 of the air conditioning system, and the structures of other parts of the railway vehicle refer to the prior art, which will not be described herein.

[0057] For the vehicle without the humidifying device, the vehicle moisture content calculation formula is as follows:

[0058] W=W2+W3-W1, wherein W is the humidity content in the vehicle, g / h; W1 is the humidity content taken away by the exhaust air, g / h; W2 is the humidity content emitted by the passengers, g / h; and W3 is the humidity content brought in by the fresh air, g / h.

[0059] In addition, the application further provides a dehumidification method, which is suitable for the air conditioning system mentioned in any of the above, and the dehumidification method comprises the following steps:

[0060] Step S1, obtaining humidity data of the passenger room 23.

[0061] Step S2, judging whether the humidity data is greater than a preset humidity value, if yes, controlling the compressor 7 to increase the working frequency or controlling the number of the working compressors 7 in the air conditioning system to be increased; if no, returning to step S1.

[0062] The application further provides a defrosting method, which is suitable for the air conditioning system mentioned in any of the above, and the defrosting method comprises the following steps:

[0063] Step S01, obtaining temperature data of the surface of the condenser 8.

[0064] Step S02, judging whether the temperature data is lower than a preset temperature value, if yes, controlling the compressor 7 to increase the working frequency or controlling the number of the working compressors 7 in the air conditioning system to be increased; if no, returning to step S01.

[0065] In the present application, the first radiator 41 and the second radiator 91, the first electromagnetic valve 10 and the second electromagnetic valve 11, the first resistance pipe 12 and the second resistance pipe 13, the first temperature sensor 14 and the second temperature sensor 17, the first supply air temperature sensor 18 and the second supply air temperature sensor 19, the heat dissipation end 43 of the first loop heat pipe and the heat dissipation end 93 of the second loop heat pipe, the heat absorption end 42 of the first loop heat pipe and the heat absorption end 92 of the second loop heat pipe, the “first” and “second” are only used to distinguish the different positions, and there is no sequence.

[0066] In the present application, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between each embodiment can be referred to each other. Any combination of all the embodiments provided by the present application is within the protection scope of the present application, and will not be repeated here.

[0067] The air conditioning system, the rail vehicle, the dehumidifying method and the defrosting method provided by the present application are described in detail above. The principles and implementation manners of the present application are described by applying specific examples in this paper, and the above description of the examples is only used to help understand the method of the present application and the core idea thereof. It should be pointed out that, for those skilled in the art, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An air conditioning system, characterized in that, It includes a fresh air valve (2), an evaporator (3), a first energy transfer device, a fan (5), an air outlet (6), a compressor (7), a condenser (8), a second energy transfer device, a four-way valve (25), a first solenoid valve (10), and a second solenoid valve (11). The second energy transfer device is arranged adjacent to the condenser (8). The gas enters through the fresh air valve (2) and flows sequentially through the evaporator (3), the first energy transfer device, the ventilator (5), and the air outlet (6) into the passenger room (23); The four ports of the four-way valve (25) are respectively connected to the inlet of the compressor (7), the outlet of the compressor (7), the condenser (8) and the evaporator (3); The first energy transfer device is connected in parallel with the condenser (8), and the first solenoid valve (10) is used to control whether the refrigerant flowing out of the condenser (8) enters the first energy transfer device; the second energy transfer device is connected in parallel with the evaporator (3), and the second solenoid valve (11) is used to control whether the refrigerant flowing out of the evaporator (3) enters the second energy transfer device; The condenser (8) and the evaporator (3) are connected by a throttling device (26); During the cooling season, the second solenoid valve (11) is normally closed. When the humidity in the passenger room (23) is higher than the preset value, the first solenoid valve (10) opens. During the heating season, the first solenoid valve (10) is normally closed. When the surface temperature of the condenser (8) is lower than the preset temperature, the second solenoid valve (11) opens. The air conditioning system also includes a first resistance pipe (12) and a second resistance pipe (13). The first resistance pipe (12) is connected in parallel with the pipe connecting the condenser (8) and the throttling device (26), and the second resistance pipe (13) is connected in parallel with the pipe connecting the evaporator (3) and the throttling device (26). The air conditioning system also includes a first temperature sensor (14), a return air temperature sensor (20), a return air humidity sensor (21), and a controller (1). The first temperature sensor (14) is used to detect the temperature of the surface of the condenser (8). The first temperature sensor (14), the return air temperature sensor (20), and the return air humidity sensor (21) are all connected to the controller (1). The return air temperature sensor (20) and the return air humidity sensor (21) are both located at the return air inlet (24) of the passenger room (23). A fresh air temperature sensor (15) and a fresh air humidity sensor (16) are provided at the outlet of the fresh air valve (2), and both the fresh air temperature sensor (15) and the fresh air humidity sensor (16) are connected to the controller (1). And / or, it also includes a second temperature sensor (17) for detecting the temperature of the surface of the evaporator (3), the second temperature sensor (17) being connected to the controller (1); It also includes a first air supply temperature sensor (18) and a second air supply temperature sensor (19), the first air supply temperature sensor (18) being disposed at the air inlet of the first energy transfer device, and the second air supply temperature sensor (19) being disposed at the air outlet (6).

2. The air conditioning system according to claim 1, characterized in that, The first energy transfer device is a first radiator (41), and the second energy transfer device is a second radiator (91).

3. The air conditioning system according to claim 1, characterized in that, The first energy transfer device is a first loop heat pipe. The heat absorption end (42) of the first loop heat pipe is located in the pipeline connecting the condenser (8) and the throttling device (26). The heat dissipation end (43) of the first loop heat pipe is located on the air inlet side of the fan (5). The gas flows sequentially through the evaporator (3), the heat dissipation end (43) of the first loop heat pipe, the fan (5), and the air outlet (6) into the passenger room (23). The second energy transfer device is a second loop heat pipe. The heat absorption end (92) of the second loop heat pipe is located in the pipeline connecting the evaporator (3) and the throttling device (26). The heat dissipation end (93) of the second loop heat pipe is located adjacent to the condenser (8).

4. A rail vehicle, characterized in that, Includes the air conditioning system as described in any one of claims 1-3.

5. A dehumidification method, applicable to the air conditioning system described in claim 1; characterized in that, The dehumidification method includes: Obtain humidity data for the guest room (23); Determine whether the humidity data is greater than the preset humidity value. If yes, control the compressor (7) to increase its operating frequency or control the number of compressors (7) operating in the air conditioning system to increase. If no, return to the previous step.

6. A defrosting method, applicable to the air conditioning system described in claim 1; characterized in that, The defrosting method includes: Acquire temperature data of the condenser (8) surface; Determine whether the temperature data is lower than the preset temperature value. If yes, control the compressor (7) to increase its operating frequency or control the number of compressors (7) operating in the air conditioning system to increase. If no, return to the previous step.

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