Air conditioning system matched with cryogenic liquid gasification process and control method thereof

Abstract

The present invention discloses an air conditioning system and a control method thereof that cooperates with the cryogenic liquid vaporization process, comprising: a first vaporizer, a liquid outlet pipe, an air supply pipe, a coolant supply pipe, a coolant return pipe, a heat exchanger, a fan, a controller, an ambient temperature sensor, a circulating liquid inlet pipe, a circulating liquid outlet pipe, a coolant supply source, a coolant temperature sensor, and a circulating pump. The air conditioning system can utilize the cold energy generated by the vaporization of the cryogenic liquid for refrigeration, and is particularly suitable for cryogenic liquid tankers that use cryogenic liquid as a power fuel. It can replace traditional vehicle air conditioning refrigeration and also achieve heating functions, eliminating the high-power consumption component required by conventional vapor compression refrigeration cycles - the compressor, thereby greatly reducing energy consumption and bringing considerable energy conservation and emission reduction benefits; the refrigerant medium for transmitting cold energy only uses coolant, and only one medium is needed to meet the functions of air conditioning cooling, heating, and cryogenic liquid vaporization, resulting in a simple structure and low cost.

Description

Technical Field

[0001] The present invention relates to the field of cryogenic liquid cold energy application, and in particular to an air-conditioning system coordinated with a cryogenic liquid gasification process and a control method thereof. Background Art

[0002] Liquefied natural gas is a cryogenic liquid. As a vehicle fuel, it needs to be vaporized and heated before entering the engine for combustion. The large amount of cold energy carried by liquefied natural gas is discharged into the air or heated water during the vaporization process, resulting in huge energy waste. If this part of the cold energy can be reasonably recovered and used to provide cooling for vehicle air conditioning, it will greatly reduce the energy consumption of automobile air conditioning and bring considerable energy-saving and emission reduction benefits. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an air-conditioning system and a control method thereof that are compatible with the cryogenic liquid vaporization process and can utilize the cold energy generated by the cryogenic liquid vaporization to greatly reduce energy consumption.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: an air-conditioning system coordinated with the cryogenic liquid gasification process, comprising: a first vaporizer, a liquid outlet pipe, an air supply pipe, a cooling liquid supply pipe, a cooling liquid return pipe, a heat exchanger, a fan, a controller, an ambient temperature sensor, a circulating liquid inlet pipe, and a circulating liquid outlet pipe. The first vaporizer is a water bath type vaporizer. The heat exchanger is used to exchange heat between air and cooling liquid. The fan blows air towards the heat exchanger to accelerate the diffusion of the air after heat exchange. The inlet of the liquid outlet pipe is used to be connected to the cryogenic liquid storage tank. The outlet of the liquid outlet pipe is connected to the medium inlet 1 of the first vaporizer. A liquid outlet valve is provided on the liquid outlet pipe. The medium outlet 1 of the first vaporizer is connected to the inlet of the air supply pipe. The outlet of the cooling liquid supply pipe is connected to the medium inlet 2 of the first vaporizer. The inlet of the cooling liquid return pipe is connected to the medium outlet 2 of the first vaporizer. The inlet of the cooling liquid supply pipe is used to be connected to the cooling liquid outlet of the cooling liquid supply source. The outlet of the cooling liquid return pipe is connected to the cooling liquid return port of the cooling liquid supply source. The cooling liquid supply source can transport cooling liquid to the cooling liquid supply pipe through the cooling liquid outlet. The cooling liquid supply source is provided with a heating device that can heat the cooling liquid. The freezing point of the cooling liquid is below -5°C. A liquid supply stop valve is connected in series on the cooling liquid supply pipe and the cooling liquid return pipe. The outlet of the circulating liquid inlet pipe is connected to the inlet of the heat exchanger. A cooling liquid temperature sensor is connected in series on the circulating liquid inlet pipe. The inlet of the circulating liquid inlet pipe is connected to the second medium outlet of the first vaporizer. The inlet of the circulating liquid outlet pipe is connected to the outlet of the heat exchanger. The outlet of the circulating liquid outlet pipe is connected to the second medium inlet of the first vaporizer. A circulating pump is connected in series on the circulating liquid inlet pipe or the circulating liquid outlet pipe. The liquid supply stop valve, the liquid outlet valve, the ambient temperature sensor, the fan, the circulating pump, and the cooling liquid temperature sensor on the cooling liquid supply pipe and the cooling liquid return pipe are all electrically connected to the controller.

[0005] The control method of the above-mentioned air-conditioning system is as follows: the liquid outlet pipe introduces the cryogenic liquid in the cryogenic liquid storage tank into the first vaporizer, the cooling liquid supply pipe introduces the cooling liquid after heating in the cooling liquid supply source into the first vaporizer, and the cooling liquid return pipe returns the cooling liquid to the cooling liquid supply source. The cooling liquid will be cooled after heat exchange with the cryogenic liquid in the first vaporizer, and the cryogenic liquid will be vaporized. The vaporized gas is transported outward by the air supply pipe to the gas supply equipment for use; when the air-conditioning system is in use: the controller starts the fan, adjusts the opening of the liquid supply stop valve on the cooling liquid supply pipe and the cooling liquid return pipe, starts the circulation pump, and the circulation liquid inlet pipe is connected to the heat exchanger. The controller can control the flow rate of the cooling liquid in the first vaporizer by adjusting the opening of the liquid supply stop valve on the cooling liquid supply pipe and the cooling liquid return pipe. Driven by the circulation pump, the cooling liquid can enter the heat exchanger through the circulation liquid inlet pipe to exchange heat with the air. When the cooling liquid temperature is lower than the air temperature, the air temperature will drop and the cooling liquid temperature will rise after the heat exchange. When the cooling liquid temperature is higher than the air temperature, the air temperature will rise and the cooling liquid temperature will drop after the heat exchange, thereby playing a heating role; when the opening of the liquid supply stop valve on the cooling liquid supply pipe and the cooling liquid return pipe is adjusted to a small degree, the temperature of the cooling liquid in the circulating liquid inlet pipe will drop, and vice versa, the temperature of the cooling liquid in the circulating liquid inlet pipe will rise; after the fan is running, the heat-exchanged air can be diffused faster and the change of the ambient temperature can be accelerated. The coolant after heat exchange in the heat exchanger will return to the first vaporizer through the circulating liquid outlet pipe to continue heat exchange with the deep-cold liquid to cool down; the coolant temperature sensor can transmit the detected temperature of the coolant in the circulating liquid inlet pipe to the controller, and the controller can adjust the flow rate and flow of the coolant in the circulating liquid inlet pipe to adjust the heat exchange effect by controlling the speed of the circulating pump. The ambient temperature sensor can transmit the detected ambient temperature to the controller, and the controller can adjust the temperature change speed of the environment by controlling the wind speed of the fan; when the air-conditioning system is not in use: the controller shuts down the fan and circulating pump.

[0006] Furthermore, in the aforementioned air conditioning system that cooperates with the cryogenic liquid gasification process, a one-way check valve is connected in series on the circulating liquid outlet pipe; and a coolant temperature sensor is arranged at the outlet of the circulating liquid inlet pipe close to the heat exchanger.

[0007] Furthermore, the aforementioned air-conditioning system that cooperates with the cryogenic liquid vaporization process, wherein: the coolant supply source is a car engine coolant system that uses cryogenic liquid as fuel, the ambient temperature sensor is arranged in the car cab, the fan can blow the heat-exchanged air into the car cab, the inlet of the liquid outlet pipe is connected to the cryogenic liquid storage tank on the car, and the outlet of the air supply pipe is connected to the gas-using equipment on the car.

[0008] Furthermore, the aforementioned air-conditioning system that cooperates with the cryogenic liquid vaporization process, wherein: a liquid inlet pipe and a liquid return pipe are also provided, the inlet of the liquid inlet pipe and the outlet of the liquid return pipe are used to be connected to the cryogenic liquid storage tank, the outlet of the liquid inlet pipe is connected to the three medium inlets of the first vaporizer, the inlet of the liquid return pipe is connected to the three medium outlets of the first vaporizer, a liquid inlet stop valve is connected in series on the liquid inlet pipe and the liquid inlet return pipe, a liquid infusion pump is connected in series on the liquid inlet pipe or the liquid infusion return pipe, and at least one liquid infusion stop valve and liquid infusion pump is electrically connected to the controller.

[0009] A further control method for the air-conditioning system of this structure is that, during use, when the cryogenic liquid discharged through the liquid outlet pipe cannot meet the ambient cooling demand, the controller will control the unopened liquid replenishment stop valves on the liquid replenishment inlet pipe and the liquid replenishment return pipe to open and start the liquid replenishment pump. Driven by the liquid replenishment pump, the cryogenic liquid in the cryogenic liquid storage tank is replenished into the first vaporizer through the liquid replenishment inlet pipe, and then returns to the cryogenic liquid storage tank through the liquid replenishment return pipe. The controller can control the flow rate of the replenished cryogenic liquid by controlling the speed of the liquid replenishment pump, and meet the ambient cooling requirements by exchanging heat between the additional replenished cryogenic liquid and the coolant; when the air-conditioning system is not in use, the controller shuts down the liquid replenishment pump and the liquid replenishment stop valve.

[0010] Furthermore, the aforementioned air-conditioning system coordinated with the cryogenic liquid vaporization process, wherein: a second vaporizer and a thermostat are also provided, the second vaporizer is a water bath type vaporizer, the outlet of the air supply pipe is connected to the medium inlet 1 of the second vaporizer, the medium outlet 1 of the second vaporizer is connected to the medium inlet 1 of the thermostat through a pipeline, the medium outlet 1 of the thermostat supplies gas to the gas-consuming equipment through a pipeline, the medium inlet 2 of the second vaporizer is connected to the coolant supply pipe through a pipeline, the medium outlet 2 of the second vaporizer is connected to the medium inlet 2 of the thermostat through a pipeline, and the medium outlet 2 of the thermostat is connected to the coolant return pipe through a pipeline.

[0011] A further control method for the air conditioning system of this structure is as follows: during operation, the operating temperature of the thermostat is pre-set, the air supply pipe continues to transport the gas to the second vaporizer, the coolant in the coolant supply pipe enters the second vaporizer through the pipeline and continues to exchange heat with the gas, and the coolant in the second vaporizer returns to the coolant return pipe through the thermostat after heat exchange. When the temperature of the gas flowing through the thermostat is lower than the operating temperature set in the thermostat, the thermostat can expand the flow diameter and increase the flow rate of the coolant in the second vaporizer, thereby increasing the temperature of the gas. Conversely, when the temperature of the gas flowing through the thermostat is higher than the operating temperature set in the thermostat, the thermostat can narrow the flow diameter and reduce the flow rate of the coolant in the second vaporizer, thereby decreasing the temperature of the gas.

[0012] Furthermore, the aforementioned air-conditioning system that cooperates with the deep-cold liquid gasification process, wherein: a cold water storage tank, an electromagnetic three-way valve, and a bypass pipe are also provided. The cold water storage tank is connected in series to the circulating liquid outlet pipe, and the electromagnetic three-way valve is connected in series to the circulating liquid inlet pipe through two ports thereon. The remaining port on the electromagnetic three-way valve is connected to the inlet of the bypass pipe, and the outlet of the bypass pipe is connected to the circulating liquid outlet pipe, and the connection point is located between the cold water storage tank and the heat exchanger. A water tank temperature sensor for detecting the temperature of the stored coolant is provided in the cold water storage tank, and the electromagnetic three-way valve and the water tank temperature sensor are electrically connected to the controller.

[0013] A further control method for the air-conditioning system of this structure is as follows: when the air-conditioning is not in use: start the circulation pump, and connect the circulation liquid inlet pipe and the bypass pipe, so that the coolant enters the bypass pipe through the electromagnetic three-way valve, and then the coolant enters the cold water storage tank. The coolant flowing out of the cold water storage tank returns to the first vaporizer to continue heat exchange with the cryogenic liquid. The controller controls the circulation pump through the water tank temperature sensor. When the coolant temperature in the cold water storage tank is lower than the set temperature, the controller controls the circulation pump to stop running. When the coolant temperature in the cold water storage tank is higher than the set temperature, the controller controls the circulation pump to start running, so that low-temperature coolant is stored in the cold water storage tank. In this way, when the air-conditioning starts cooling, the low-temperature coolant in the cold water storage tank can quickly and timely provide cold energy to the heat exchanger.

[0014] The advantages of the present invention are as follows: the air-conditioning system can utilize the cold energy generated by the vaporization of cryogenic liquid for refrigeration, and is particularly suitable for vehicles that use cryogenic liquid as power fuel. It can replace traditional vehicle air-conditioning refrigeration and can also realize heating function, eliminating the high-power consumption component required for conventional air-conditioning compression refrigeration cycle - the compressor, thereby greatly reducing energy consumption and bringing considerable energy-saving and emission reduction benefits; the refrigerant medium for transmitting cold energy only uses coolant - such as engine coolant, and only one medium is needed to meet the functions of air-conditioning cooling, heating and cryogenic liquid vaporization, with a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a preferred embodiment of the air-conditioning system according to the present invention that cooperates with the cryogenic liquid gasification process. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.

[0017] like Figure 1As shown, the air conditioning system that cooperates with the cryogenic liquid gasification process includes: a first vaporizer 1, a liquid outlet pipe 2, an air supply pipe 3, a coolant supply pipe 4, a coolant return pipe 5, a heat exchanger 6, a fan 7, a controller, an ambient temperature sensor 8, a circulating liquid inlet pipe 9, and a circulating liquid outlet pipe 10. The first vaporizer 1 is a water bath vaporizer. The heat exchanger 6 is used to exchange heat between air and coolant. The fan 7 blows air towards the heat exchanger 6 to accelerate the diffusion of the air after heat exchange. The inlet of the liquid outlet pipe 2 is used to communicate with the cryogenic liquid storage when working. The tank 11 is connected, the outlet of the liquid outlet pipe 2 is connected to the medium inlet of the first vaporizer 1, the liquid outlet pipe 2 is provided with a liquid outlet valve, the medium outlet of the first vaporizer 1 is connected to the inlet of the air supply pipe 3, the outlet of the coolant supply pipe 4 is connected to the medium inlet 2 of the first vaporizer 1, the inlet of the coolant return pipe 5 is connected to the medium outlet 2 of the first vaporizer 1, the inlet of the coolant supply pipe 4 is used to be connected to the coolant outlet of the coolant supply source 12 when working, and the outlet of the coolant return pipe 5 is used to be connected to the coolant outlet of the coolant supply source 12 when working. The cooling liquid return port of the liquid supply source 12 is connected, and the cooling liquid supply source 12 can transport cooling liquid to the cooling liquid supply pipe 4 through the cooling liquid outlet. The cooling liquid supply source 12 is provided with a heating device that can heat the cooling liquid. In order to prevent the cooling liquid from freezing during normal operation, the freezing point of the cooling liquid is below -5°C, preferably -40°C. A liquid supply stop valve is connected in series on the cooling liquid supply pipe 4 and the cooling liquid return pipe 5. The outlet of the circulating liquid inlet pipe 9 is connected to the inlet of the heat exchanger 6. The circulating liquid inlet pipe 9 is connected in series with a cooling liquid temperature controller. Sensor 13, the inlet of the circulating liquid inlet pipe 9 is connected to the second medium outlet of the first vaporizer 1, the inlet of the circulating liquid outlet pipe 10 is connected to the outlet of the heat exchanger 6, and the outlet of the circulating liquid outlet pipe 10 is connected to the second medium inlet of the first vaporizer 1. A circulating pump 15 is connected in series to the circulating liquid inlet pipe 9 or the circulating liquid outlet pipe 10, and the liquid supply stop valve, liquid outlet valve, ambient temperature sensor 8, fan 7, circulating pump 15, and coolant temperature sensor 13 on the coolant supply pipe 4 and the coolant return pipe 5 are all electrically connected to the controller.

[0018] The control method of the air conditioning system with the above structure is as follows: the liquid outlet pipe 2 introduces the cryogenic liquid in the cryogenic liquid storage tank 11 into the first vaporizer 1, the cooling liquid supply pipe 4 introduces the heated cooling liquid in the cooling liquid supply source 12 into the first vaporizer 1, and the cooling liquid return pipe 5 returns the cooling liquid to the cooling liquid supply source 12. The cooling liquid is cooled after heat exchange with the cryogenic liquid in the first vaporizer 1, and the cryogenic liquid is vaporized. The vaporized gas is transported outward by the gas supply pipe 3 to the gas-using equipment for use; when the air conditioning system is in use: control The controller starts the fan 7, adjusts the opening of the liquid supply stop valve on the coolant supply pipe 4 and the coolant return pipe 5, and starts the circulation pump 15. The circulation liquid inlet pipe 9 is connected to the heat exchanger 6. The controller can control the flow of the coolant in the first vaporizer 1 by adjusting the opening of the liquid supply stop valve on the coolant supply pipe 4 and the coolant return pipe 5. Driven by the circulation pump 15, the coolant can enter the heat exchanger 6 through the circulation liquid inlet pipe 9 to exchange heat with the air. When the coolant temperature is lower than the air temperature, the air temperature will drop after the heat exchange, and the coolant temperature will rise. The temperature of the coolant will rise, thus playing a cooling role. When the coolant temperature is higher than the air temperature, the air temperature will rise after heat exchange and the coolant temperature will drop, thus playing a heating role. When the opening of the liquid supply stop valve on the coolant supply pipe 4 and the coolant return pipe 5 is adjusted to a small degree, the temperature of the coolant in the circulating liquid inlet pipe 9 will drop, and conversely, the temperature of the coolant in the circulating liquid inlet pipe 9 will rise. After the fan 7 is running, it can accelerate the diffusion of the heat-exchanged air and accelerate the change of the ambient temperature. The coolant after heat exchange in the heat exchanger 6 will return through the circulating liquid outlet pipe 2 The air enters the first vaporizer 1 and continues to exchange heat with the cryogenic liquid to cool down; the coolant temperature sensor 13 can transmit the detected temperature of the coolant in the circulating liquid inlet pipe 9 to the controller, and the controller can adjust the flow rate and flow of the coolant in the circulating liquid inlet pipe 9 to adjust the heat exchange effect by controlling the rotation speed of the circulating pump 15. The ambient temperature sensor 8 can transmit the detected ambient temperature to the controller, and the controller can adjust the temperature change speed of the environment by controlling the wind speed of the fan 7; when the air-conditioning system is not in use: the controller shuts down the fan 7 and the circulating pump 15.

[0019] During the specific implementation process, the following preferred implementation methods can also be provided: the air-conditioning system is also provided with a liquid replenishment inlet pipe 16 and a liquid replenishment return pipe 17, the inlet of the liquid replenishment inlet pipe 16 and the outlet of the liquid replenishment return pipe 17 are used to be connected to the cryogenic liquid storage tank 11, the outlet of the liquid replenishment inlet pipe 16 is connected to the three medium inlets of the first vaporizer 1, and the inlet of the liquid replenishment return pipe 17 is connected to the three medium outlets of the first vaporizer 1, and a liquid replenishment stop valve is connected in series on the liquid replenishment inlet pipe 16 and the liquid replenishment return pipe 17, and a liquid replenishment pump 18 is connected in series on the liquid replenishment inlet pipe 16 or the liquid replenishment return pipe 17, and at least one liquid replenishment stop valve and the liquid replenishment pump 18 are electrically connected to the controller.

[0020] A further control method for the air-conditioning system of this structure is as follows: when the air-conditioning system is in use, when the cryogenic liquid discharged through the liquid outlet pipe cannot meet the ambient cooling demand, the controller will control the unopened liquid replenishment stop valves on the liquid replenishment inlet pipe 16 and the liquid replenishment return pipe 17 to open and start the liquid replenishment pump 18. Driven by the liquid replenishment pump 18, the cryogenic liquid in the cryogenic liquid storage tank 11 is replenished into the first vaporizer 1 through the liquid replenishment inlet pipe 16, and then returns to the cryogenic liquid storage tank 11 through the liquid replenishment return pipe 17. The controller can control the flow rate of the replenished cryogenic liquid by controlling the speed of the liquid replenishment pump 18, and meet the ambient cooling requirements by exchanging heat between the additional replenished cryogenic liquid and the coolant; when the air-conditioning system is not in use, the controller shuts down the liquid replenishment pump and the liquid replenishment stop valve.

[0021] During the specific implementation process, the following preferred implementation mode can also be provided: the air-conditioning system is further provided with a second vaporizer 19 and a thermostat 20, the second vaporizer 19 is a water bath vaporizer, the outlet of the air supply pipe 3 is connected to the medium inlet 1 of the second vaporizer 19, the medium outlet 1 of the second vaporizer 19 is connected to the medium inlet 1 of the thermostat 20 through a pipeline, the medium outlet 1 of the thermostat 20 supplies gas to the gas-consuming equipment through a pipeline, the medium inlet 2 of the second vaporizer 19 is connected to the coolant supply pipe 4 through a pipeline, the medium outlet 2 of the second vaporizer 19 is connected to the medium inlet 2 of the thermostat 20 through a pipeline, and the medium outlet 2 of the thermostat 20 is connected to the coolant return pipe 5 through a pipeline.

[0022] The control method for this air conditioning system is as follows: During operation, the thermostat's operating temperature is pre-set, and the air supply pipe 3 continues to transport air to the second vaporizer 19. Coolant in the coolant supply pipe 4 enters the second vaporizer 19 through the pipe, where it continues to exchange heat with the air, adjusting the air temperature to meet the required air supply temperature at the back end. After heat exchange, the coolant in the second vaporizer 19 returns to the coolant return pipe 5 through the thermostat 20. When the temperature of the air flowing through the thermostat is lower than the set operating temperature of the thermostat 20, the thermostat 20 expands the flow diameter and increases the flow of coolant in the second vaporizer 19, thereby increasing the air temperature. Conversely, when the temperature of the air flowing through the thermostat is higher than the set operating temperature of the thermostat 20, the thermostat 20 contracts the flow diameter and reduces the flow of coolant in the second vaporizer 19, thereby decreasing the air temperature. The thermostat is a mechanical thermostat, and the set temperature is manually adjusted.

[0023] During the specific implementation process, the following preferred implementation method can also be provided: the air-conditioning system is also provided with a cold water storage tank 21, an electromagnetic three-way valve 22, and a bypass pipe 23. The cold water storage tank 21 is connected in series to the circulating liquid outlet pipe 10, and the electromagnetic three-way valve 22 is connected in series to the circulating liquid inlet pipe 9 through two ports thereon. The remaining port on the electromagnetic three-way valve 22 is connected to the inlet of the bypass pipe 23, and the outlet of the bypass pipe 23 is connected to the circulating liquid outlet pipe 10, and the connection point is located between the cold water storage tank 21 and the heat exchanger 6. A water tank temperature sensor 24 for detecting the temperature of the stored coolant is provided in the cold water storage tank 21, and the electromagnetic three-way valve 22 and the water tank temperature sensor 24 are electrically connected to the controller.

[0024] A further control method for the air-conditioning system of this structure is as follows: when the air-conditioning is not in use: start the circulation pump 15, and connect the circulation liquid inlet pipe 9 and the bypass pipe 23, so that the coolant enters the bypass pipe 23 through the electromagnetic three-way valve 22, and then the coolant enters the cold water storage tank 21. The coolant flowing out of the cold water storage tank returns to the first vaporizer 1 to continue heat exchange with the cryogenic liquid. The controller controls the circulation pump 15 through the water tank temperature sensor 24. When the coolant temperature in the cold water storage tank 21 is lower than the set temperature, the controller controls the circulation pump 15 to stop running. When the coolant temperature in the cold water storage tank 21 is higher than the set temperature, the controller controls the circulation pump 15 to start running, so that low-temperature coolant is stored in the cold water storage tank 21; in this way, when the air-conditioning starts cooling, the low-temperature coolant in the cold water storage tank 21 can quickly and timely provide cold energy to the heat exchanger 6.

[0025] In practice, a one-way check valve 25 is connected in series to the circulating outlet pipe 10 to prevent coolant backflow. To more accurately detect the temperature of the coolant entering the heat exchanger 6, a coolant temperature sensor 13 is located near the outlet of the circulating inlet pipe 9 of the heat exchanger 6. For ease of control, the supply shutoff valves on the coolant supply pipe 4 and the coolant return pipe 5, as well as the refill shutoff valve on the refill return pipe 17, are electromagnetic shutoff valves. The refill shutoff valve on the refill inlet pipe 16 is a manual shutoff valve. The circulating pump 15 is located on the circulating inlet pipe 9, and the refill pump 18 is located on the refill return pipe 17.

[0026] During the specific implementation process, the air-conditioning system can be preferably used in automobiles that use cryogenic liquids, such as liquefied natural gas, as fuel. The coolant supply source 12 is the automobile engine coolant system. The automobile engine coolant system uses coolant to cool the engine, thereby continuously generating high-temperature coolant after the vehicle is started; the ambient temperature sensor 8 is arranged in the automobile cab, and the fan 7 can blow the heat-exchanged air into the automobile cab. The inlet of the liquid outlet pipe 2 is connected to the cryogenic liquid storage tank 11 on the automobile, and the outlet of the air supply pipe or the medium outlet of the thermostat 20 is connected to the gas-using equipment on the automobile, the engine. The cryogenic liquid can be LNG or liquid hydrogen.

[0027] In the above-mentioned air-conditioning system, there are three coolant circuits, among which: the first circuit is: coolant supply source 12 → coolant supply pipe 4 → first vaporizer 1 → coolant return pipe 5 → coolant supply source 12; the second circuit is: circulating liquid inlet pipe 9 → heat exchanger 6 → circulating liquid outlet pipe 10 → first vaporizer 1 → circulating liquid inlet pipe 9; the third circuit is: circulating liquid inlet pipe 9 → bypass pipe 23 → cold water storage tank 21 on circulating liquid outlet pipe 10 → first vaporizer 1 → circulating liquid inlet pipe 9.

[0028] In addition to being used for the vaporization of cryogenic liquid, the coolant in the second circuit is also used to transfer the cold energy generated by the vaporization, so that the cold energy can be used for air conditioning and refrigeration.

[0029] In addition to being used to vaporize the cryogenic liquid, the coolant in the first circuit can also be used to regulate the temperature of the coolant in the second circuit to prevent the coolant in the second circuit from freezing due to overcooling. For example, when using the air conditioning system in mild weather, as the coolant continues to circulate in the second circuit, the coolant will become lower and lower in temperature because it cannot obtain enough heat from the air. When the coolant temperature is below the freezing point, the coolant will freeze and cause air conditioning refrigeration failure.

[0030] When the air conditioning system is not in use, the third circuit can be used to store some cold energy. The coolant in the first circuit can also be used to regulate the temperature of the coolant in the third circuit, preventing it from freezing. Furthermore, when the air conditioning system is heating, the flow rate in the first circuit can be increased to transfer more heat energy from the coolant supply source 12, providing a heat source for the air conditioning system, thereby enabling the air conditioning system to also provide heating capabilities.

[0031] The air conditioning system of the present invention utilizes this unique piping connection structure, allowing the refrigerant medium used to transfer cold energy to coolant—such as engine coolant. This single medium can fulfill the functions of cooling, heating, and cryogenic liquid vaporization, resulting in a simple structure and low cost. Furthermore, the system eliminates the high-power consumption component—the compressor—required in conventional air conditioning compression refrigeration cycles, significantly reducing energy consumption and delivering significant energy-saving and emission-reduction benefits.

[0032] If the second circuit is eliminated and the heat exchanger 6 in the second circuit is directly connected in series to the coolant return pipe 5 in the first circuit, the coolant temperature in the coolant return pipe 5 needs to be reduced to the temperature required for air conditioning refrigeration before the air conditioning system can be cooled. Since the coolant temperature in the coolant supply source 12 is relatively high, for example, the coolant temperature in the coolant system of an automobile engine is around 80°C, if the coolant temperature required for air conditioning refrigeration is 5°C, reducing the coolant temperature from 80°C to 5°C requires a large amount of cryogenic liquid. If the amount of gas generated by the vaporization of the cryogenic liquid is limited, the coolant temperature in the coolant return pipe 5 is difficult to drop to the temperature required for air conditioning refrigeration, and the air conditioning refrigeration function cannot be used. If the second circuit is used, after the air conditioning is turned on, the coolant will circulate in the second circuit, and will be repeatedly used to vaporize the cryogenic liquid and transfer the cold energy generated by the vaporization to the heat exchanger 6. The coolant will heat up after heat exchange in the heat exchanger 6. The temperature difference between the coolant in the circulating liquid inlet pipe 9 and the circulating liquid outlet pipe 10 is usually around 15°C. The cold energy generated when the cryogenic liquid vaporizes normally and the usage is limited is sufficient to reduce the temperature of the coolant in the circulating liquid inlet pipe 9 to the temperature required for air conditioning, so that the cooling work of the air conditioning system can operate normally and stably.

[0033] In addition, the above-mentioned air conditioning system can also be used in a large gas supply station, in which case the coolant supply source 12 is a boiler coolant circulation system or a heating circulation system in the gas supply station.

Claims

1. An air conditioning system adapted to the cryogenic liquid vaporization process, characterized in that: include: The first vaporizer, a liquid outlet pipe, an air supply pipe, a coolant supply pipe, a coolant return pipe, a heat exchanger, a fan, a controller, an ambient temperature sensor, a circulating liquid inlet pipe, and a circulating liquid outlet pipe. The first vaporizer is a water bath type vaporizer. The heat exchanger is used to exchange heat between air and coolant. The fan blows air toward the heat exchanger to accelerate the diffusion of the air after heat exchange. The inlet of the liquid outlet pipe is used to be connected to the cryogenic liquid storage tank. The outlet of the liquid outlet pipe is connected to the medium inlet 1 of the first vaporizer. A liquid outlet valve is provided on the liquid outlet pipe. The medium outlet 1 of the first vaporizer is connected to the inlet of the air supply pipe. The outlet of the coolant supply pipe is connected to the medium inlet 2 of the first vaporizer. The inlet of the coolant return pipe is connected to the medium outlet 2 of the first vaporizer. The inlet of the coolant supply pipe is used to be connected to the coolant outlet of the coolant supply source. The outlet of the coolant return pipe is used to be connected to the coolant supply source. The cooling liquid return port is connected to the cooling liquid supply source, which can transport cooling liquid to the cooling liquid supply pipe through the cooling liquid outlet. The cooling liquid supply source is provided with a heating device that can heat the cooling liquid. The freezing point of the cooling liquid is below -5°C. A liquid supply stop valve is connected in series on the cooling liquid supply pipe and the cooling liquid return pipe. The outlet of the circulating liquid inlet pipe is connected to the inlet of the heat exchanger. A cooling liquid temperature sensor is connected in series on the circulating liquid inlet pipe. The inlet of the circulating liquid inlet pipe is connected to the second medium outlet of the first vaporizer, the inlet of the circulating liquid outlet pipe is connected to the outlet of the heat exchanger, and the outlet of the circulating liquid outlet pipe is connected to the second medium inlet of the first vaporizer. A circulating pump is connected in series on the circulating liquid inlet pipe or the circulating liquid outlet pipe. The liquid supply stop valve, liquid outlet valve, ambient temperature sensor, fan, circulating pump and cooling liquid temperature sensor on the cooling liquid supply pipe and the cooling liquid return pipe are all electrically connected to the controller.

2. The air conditioning system according to claim 1, which is compatible with the cryogenic liquid gasification process, is characterized in that: A liquid inlet pipe and a liquid inlet return pipe are also provided. The inlet of the liquid inlet pipe and the outlet of the liquid inlet return pipe are used to be connected to the cryogenic liquid storage tank. The outlet of the liquid inlet pipe is connected to the third medium inlet of the first vaporizer, and the inlet of the liquid inlet return pipe is connected to the third medium outlet of the first vaporizer. A liquid inlet stop valve is connected in series on the liquid inlet pipe and the liquid inlet return pipe, and a liquid inlet pump is connected in series on the liquid inlet pipe or the liquid inlet return pipe. At least one liquid inlet stop valve and the liquid inlet pump are electrically connected to the controller.

3. The air conditioning system according to claim 1 or 2, which is compatible with the cryogenic liquid gasification process, is characterized in that: A one-way check valve is connected in series to the circulating liquid outlet pipe; The coolant temperature sensor is located near the outlet of the circulating liquid inlet pipe of the heat exchanger.

4. The air conditioning system according to claim 1 or 2, which is compatible with the cryogenic liquid gasification process, is characterized in that: The coolant supply source is a car engine coolant system that uses cryogenic liquid as fuel. The ambient temperature sensor is installed in the car cab. The fan can blow the heat-exchanged air into the car cab. The inlet of the liquid outlet pipe is connected to the cryogenic liquid storage tank on the car, and the outlet of the air supply pipe is connected to the gas-using equipment on the car.

5. The air conditioning system according to claim 1 or 2, which is compatible with the cryogenic liquid gasification process, is characterized in that: A second vaporizer and a thermostat are also provided. The second vaporizer is a water bath type vaporizer. The outlet of the air supply pipe is connected to the medium inlet 1 of the second vaporizer. The medium outlet 1 of the second vaporizer is connected to the medium inlet 1 of the thermostat through a pipeline. The medium outlet 1 of the thermostat supplies gas to the gas-consuming equipment through a pipeline. The medium inlet 2 of the second vaporizer is connected to the coolant supply pipe through a pipeline. The medium outlet 2 of the second vaporizer is connected to the medium inlet 2 of the thermostat through a pipeline. The medium outlet 2 of the thermostat is connected to the coolant return pipe through a pipeline.

6. The air conditioning system according to claim 5, which is compatible with the cryogenic liquid gasification process, is characterized in that: A one-way check valve is connected in series to the circulating liquid outlet pipe; The coolant temperature sensor is located near the outlet of the circulating liquid inlet pipe of the heat exchanger.

7. The air conditioning system according to claim 5, which is compatible with the cryogenic liquid gasification process, is characterized in that: The coolant supply source is a car engine coolant system that uses cryogenic liquid as fuel. The ambient temperature sensor is installed in the car cab. The fan can blow the heat-exchanged air into the car cab. The inlet of the liquid outlet pipe is connected to the cryogenic liquid storage tank on the car, and the medium outlet of the thermostat is connected to the gas-using equipment on the car.

8. The air conditioning system according to claim 1 or 2, which is compatible with the cryogenic liquid gasification process, is characterized in that: A cold water storage tank, an electromagnetic three-way valve, and a bypass pipe are also provided. The cold water storage tank is connected in series to the circulating liquid outlet pipe. The electromagnetic three-way valve is connected in series to the circulating liquid inlet pipe through two ports thereon. The remaining port on the electromagnetic three-way valve is connected to the inlet of the bypass pipe. The outlet of the bypass pipe is connected to the circulating liquid outlet pipe, and the connection point is located between the cold water storage tank and the heat exchanger. A water tank temperature sensor for detecting the temperature of the stored coolant is provided in the cold water storage tank. The electromagnetic three-way valve and the water tank temperature sensor are electrically connected to the controller.

9. The air conditioning system according to claim 8, which is compatible with the cryogenic liquid gasification process, is characterized in that: A one-way check valve is connected in series on the circulating liquid outlet pipe; and a coolant temperature sensor is arranged at the outlet of the circulating liquid inlet pipe close to the heat exchanger.

10. The air conditioning system according to claim 8, which is compatible with the cryogenic liquid gasification process, is characterized in that: The coolant supply source is a car engine coolant system that uses cryogenic liquid as fuel. The ambient temperature sensor is installed in the car cab. The fan can blow the heat-exchanged air into the car cab. The inlet of the liquid outlet pipe is connected to the cryogenic liquid storage tank on the car, and the outlet of the air supply pipe is connected to the gas-using equipment on the car.

11. The air conditioning system according to claim 5, which is compatible with the cryogenic liquid gasification process, is characterized in that: A cold water storage tank, an electromagnetic three-way valve, and a bypass pipe are also provided. The cold water storage tank is connected in series to the circulating liquid outlet pipe. The electromagnetic three-way valve is connected in series to the circulating liquid inlet pipe through two ports thereon. The remaining port on the electromagnetic three-way valve is connected to the inlet of the bypass pipe. The outlet of the bypass pipe is connected to the circulating liquid outlet pipe, and the connection point is located between the cold water storage tank and the heat exchanger. A water tank temperature sensor for detecting the temperature of the stored coolant is provided in the cold water storage tank. The electromagnetic three-way valve and the water tank temperature sensor are electrically connected to the controller.

12. The air conditioning system according to claim 11, which is compatible with the cryogenic liquid gasification process, is characterized in that: A one-way check valve is connected in series on the circulating liquid outlet pipe; and a coolant temperature sensor is arranged at the outlet of the circulating liquid inlet pipe close to the heat exchanger.

13. The air conditioning system according to claim 11, wherein: The coolant supply source is a car engine coolant system that uses cryogenic liquid as fuel. The ambient temperature sensor is installed in the car cab. The fan can blow the heat-exchanged air into the car cab. The inlet of the liquid outlet pipe is connected to the cryogenic liquid storage tank on the car, and the medium outlet of the thermostat is connected to the gas-using equipment on the car.

14. A method for controlling an air conditioning system in conjunction with a cryogenic liquid vaporization process, characterized in that: The air conditioning system according to claim 1 is adopted, wherein the liquid outlet pipe introduces the cryogenic liquid in the cryogenic liquid storage tank into the first vaporizer, the coolant supply pipe introduces the coolant after the temperature is increased in the coolant supply source into the first vaporizer, and the coolant return pipe returns the coolant to the coolant supply source. The coolant is cooled after heat exchange with the cryogenic liquid in the first vaporizer, and the cryogenic liquid is vaporized. The vaporized gas is transported to the outside by the air supply pipe for use by the gas supply equipment; when the air conditioning system is in use: the controller starts the fan, adjusts the coolant supply pipe and the coolant return pipe The opening of the liquid supply stop valve and the circulation pump are started. The circulation liquid inlet pipe is connected to the heat exchanger. The controller can control the flow of the coolant in the first vaporizer by adjusting the opening of the liquid supply stop valve on the coolant supply pipe and the coolant return pipe. Driven by the circulation pump, the coolant can enter the heat exchanger through the circulation liquid inlet pipe to exchange heat with the air. When the coolant temperature is lower than the air temperature, the air temperature will drop after the heat exchange and the coolant temperature will rise, thereby playing a cooling role. When the coolant temperature is higher than the air temperature, the air temperature will rise after the heat exchange and the coolant The temperature will drop, thus playing a heating role; when the opening of the liquid supply stop valve on the coolant supply pipe and the coolant return pipe is adjusted to a small degree, the temperature of the coolant in the circulating liquid inlet pipe will drop, and vice versa, the temperature of the coolant in the circulating liquid inlet pipe will rise; after the fan is running, the air after heat exchange will be diffused faster and the change of ambient temperature will be accelerated. The coolant after heat exchange in the heat exchanger will return to the first vaporizer through the circulating liquid outlet pipe to continue to exchange heat with the cryogenic liquid and cool down; the coolant temperature sensor can transmit the detected temperature of the coolant in the circulating liquid inlet pipe to the controller, and the controller The controller can adjust the flow rate and flow of the coolant in the circulating liquid inlet pipe by controlling the rotation speed of the circulating pump to adjust the heat exchange effect. The ambient temperature sensor can transmit the detected ambient temperature to the controller, and the controller can adjust the temperature change speed of the environment by controlling the wind speed of the fan. When the air-conditioning system is not in use, the controller shuts down the fan and the circulating pump. When the air-conditioning system is used in a car that uses cryogenic liquid as fuel, the coolant supply source is the car engine coolant system, the ambient temperature sensor is arranged in the car cab, and the fan can blow the heat-exchanged air into the cab.

15. The control method of an air conditioning system in conjunction with a cryogenic liquid vaporization process according to claim 14, characterized in that: The air conditioning system is also provided with a liquid replenishment inlet pipe and a liquid replenishment return pipe. The inlet of the liquid replenishment inlet pipe and the outlet of the liquid replenishment return pipe are connected to the cryogenic liquid storage tank, the outlet of the liquid replenishment inlet pipe is connected to the third medium inlet of the first vaporizer, and the inlet of the liquid replenishment return pipe is connected to the third medium outlet of the first vaporizer. A liquid replenishment stop valve is connected in series on the liquid replenishment inlet pipe and the liquid replenishment return pipe, and a liquid replenishment pump is connected in series on the liquid replenishment inlet pipe or the liquid replenishment return pipe. At least one liquid replenishment stop valve and the liquid replenishment pump are electrically connected to the controller; when the air conditioning system is in use; when the cryogenic liquid discharged through the liquid outlet pipe cannot meet the requirements When there is a need for ambient cooling, the controller will control the unopened liquid replenishment stop valves on the liquid replenishment inlet pipe and the liquid replenishment return pipe to open and start the liquid replenishment pump. Driven by the liquid replenishment pump, the cryogenic liquid in the cryogenic liquid storage tank is replenished into the first vaporizer through the liquid replenishment inlet pipe, and then returned to the cryogenic liquid storage tank through the liquid replenishment return pipe. The controller can control the flow rate of the replenished cryogenic liquid by controlling the speed of the liquid replenishment pump, and meet the ambient cooling requirements by exchanging heat between the additional replenished cryogenic liquid and the coolant; when the air-conditioning system is not in use, the controller shuts down the liquid replenishment pump and the liquid replenishment stop valve.

16. The control method of an air conditioning system in conjunction with a cryogenic liquid gasification process according to claim 14 or 15, characterized in that: The air conditioning system is also provided with a second vaporizer and a thermostat. The second vaporizer is a water bath vaporizer. The outlet of the air supply pipe is connected to the medium inlet of the second vaporizer. The medium outlet of the second vaporizer is connected to the medium inlet of the thermostat through a pipeline. The medium outlet of the thermostat supplies gas to the gas-consuming equipment through a pipeline. The medium inlet of the second vaporizer is connected to the coolant supply pipe through a pipeline. The medium outlet of the second vaporizer is connected to the medium inlet of the thermostat through a pipeline. The medium outlet of the thermostat is connected to the coolant return pipe through a pipeline. When working, the working temperature of the thermostat is pre-set, and the air supply pipe continues to transport the gas. The coolant in the coolant supply pipe enters the second vaporizer through the pipeline and continues to exchange heat with the gas. After the heat exchange, the coolant in the second vaporizer returns to the coolant return pipe through the thermostat. When the temperature of the gas flowing through the thermostat is lower than the operating temperature set in the thermostat, the thermostat can expand the flow diameter and increase the flow rate of the coolant in the second vaporizer, thereby increasing the temperature of the gas. Conversely, when the temperature of the gas flowing through the thermostat is higher than the operating temperature set in the thermostat, the thermostat can narrow the flow diameter and reduce the flow rate of the coolant in the second vaporizer, thereby reducing the temperature of the gas.

17. The control method of an air conditioning system in conjunction with a cryogenic liquid gasification process according to claim 14 or 15, characterized in that: The air conditioning system is also provided with a cold water storage tank, an electromagnetic three-way valve, and a bypass pipe. The cold water storage tank is connected in series to the circulating liquid outlet pipe. The electromagnetic three-way valve is connected in series to the circulating liquid inlet pipe through two ports on it. The remaining port on the electromagnetic three-way valve is connected to the inlet of the bypass pipe. The outlet of the bypass pipe is connected to the circulating liquid outlet pipe, and the connection point is located between the cold water storage tank and the heat exchanger. A water tank temperature sensor for detecting the temperature of the stored coolant is provided in the cold water storage tank. The electromagnetic three-way valve and the water tank temperature sensor are electrically connected to the controller. When the air conditioner is not in use: start the circulation pump, and connect the circulating liquid inlet pipe and the bypass pipe. The coolant enters the bypass pipe through the electromagnetic three-way valve, and then enters the cold water tank. The coolant flowing out of the cold water tank returns to the first vaporizer to continue heat exchange with the cryogenic liquid. The controller controls the circulation pump through the water tank temperature sensor. When the coolant temperature in the cold water tank is lower than the set temperature, the controller controls the circulation pump to stop running. When the coolant temperature in the cold water tank is higher than the set temperature, the controller controls the circulation pump to start running, so that low-temperature coolant is stored in the cold water tank; in this way, when the air conditioner starts cooling, the low-temperature coolant in the cold water tank can quickly and timely provide cold energy to the heat exchanger.

18. The control method of an air conditioning system in conjunction with a cryogenic liquid vaporization process according to claim 16, characterized in that: The air conditioning system is also provided with a cold water storage tank, an electromagnetic three-way valve, and a bypass pipe. The cold water storage tank is connected in series to the circulating liquid outlet pipe. The electromagnetic three-way valve is connected in series to the circulating liquid inlet pipe through two ports on it. The remaining port on the electromagnetic three-way valve is connected to the inlet of the bypass pipe. The outlet of the bypass pipe is connected to the circulating liquid outlet pipe, and the connection point is located between the cold water storage tank and the heat exchanger. A water tank temperature sensor for detecting the temperature of the stored coolant is provided in the cold water storage tank. The electromagnetic three-way valve and the water tank temperature sensor are electrically connected to the controller. When the air conditioner is not in use: start the circulation pump, and connect the circulating liquid inlet pipe and the bypass pipe. The coolant enters the bypass pipe through the electromagnetic three-way valve, and then enters the cold water tank. The coolant flowing out of the cold water tank returns to the first vaporizer to continue heat exchange with the cryogenic liquid. The controller controls the circulation pump through the water tank temperature sensor. When the coolant temperature in the cold water tank is lower than the set temperature, the controller controls the circulation pump to stop running. When the coolant temperature in the cold water tank is higher than the set temperature, the controller controls the circulation pump to start running, so that low-temperature coolant is stored in the cold water tank; in this way, when the air conditioner starts cooling, the low-temperature coolant in the cold water tank can quickly and timely provide cold energy to the heat exchanger.

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