A multi-type central air conditioning system that can operate both heating and cooling simultaneously

Abstract

The present invention relates to a multi-type central air conditioning system capable of simultaneously operating heating and cooling, and includes a condensation module, a plurality of indoor fan coils, a high-pressure circulation pipe, a medium-pressure circulation pipe, a low-pressure circulation pipe, and an evaporation module, in which the indoor fan coil is connected to the high-pressure circulation pipe by a first branch pipe, to the low-pressure circulation pipe by a second branch pipe, and to the medium-pressure circulation pipe by a third branch pipe, and the first branch pipe and the second branch pipe are each provided with an electromagnetic valve. The beneficial effect is that when some areas are heated in summer, or some rooms are cooled in winter, the refrigerant circulation is achieved by switching the solenoid valve and using the medium pressure circulation pipe, providing the multi-type central air conditioning system with multiple operating modes (independent cooling / independent heating / simultaneous operation of local cooling and local heating), thereby increasing the diversity of the overall operating conditions of the multi-type central air conditioning system without adding complex refrigerant switching piping. The condensing module and the evaporating module can further function as a balancer of the multi-type central air conditioning system, ensuring the efficient and stable operation of the multi-type central air conditioning system.

Description

[Technical field]

[0001] The present invention relates to the field of air conditioners, and more particularly to a multi-type central air conditioning system capable of simultaneously operating heating and cooling. [Background technology]

[0002] The central air conditioner cools or heats the indoor space by circulating the cooling air, uniformly cooling in summer and uniformly heating in winter, which is the basic function of the air conditioner. However, there is one defect: when the cooling mode is activated, all the air conditioners are in the cooling mode, and when the heating mode is activated, all the air conditioners are in the heating mode. During seasonal transitions, for example in southern China, when the weather gets colder and hotter, people have different needs for comfortable temperature. For example, well-built middle-aged and young people feel hot and turn on the air conditioner for cooling, while elderly people and young children feel cold and require heating. Currently, common multi-type units on the market are generally only capable of providing a single cooling or heating mode. To meet the requirement of cooling and heating different rooms simultaneously with one system, two sets of independent air conditioning systems need to be installed, which increases the construction cost.

[0003] As the problem of energy shortages becomes increasingly apparent, China has put forward a national future development strategy with a double carbon target. Energy saving, environmental friendliness and low carbon have become the mainstream direction of current social development and guide the development direction of technological application in all industries. In terms of future choices for cooling materials, CO2, a natural material, has once again attracted the attention of engineers in the cooling industry due to its characteristics of large pressure difference, low viscosity, stable chemical properties, and good thermal properties. In recent years, the market share of CO2-related products has been increasing. Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, the motivation for the research of this invention is to provide a multi-type central air conditioning system that can simultaneously cool some independent spaces and heat other independent spaces using one set of the multi-type central air conditioning system, and that can conveniently switch between cooling and heating and can operate both cooling and heating simultaneously.

[0005] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a multi-type central air conditioning system capable of simultaneously cooling some independent spaces and heating other independent spaces by using one set of the multi-type central air conditioning system, and capable of simultaneously operating cooling and heating with convenient switching between cooling and heating. [Means for solving the problem]

[0006] The present invention provides the following: A multi-type central air conditioning system capable of simultaneously operating heating and cooling, comprising a condensing module, a plurality of indoor fan coils, a high-pressure circulation pipe, a medium-pressure circulation pipe, a low-pressure circulation pipe and an evaporation module, wherein the condensing module comprises a compressor, a condenser and a liquid storage tank connected in sequence, the high-pressure circulation pipe is connected to the exhaust end of the compressor, the medium-pressure circulation pipe is connected to the liquid storage tank and the evaporation module, the low-pressure circulation pipe is connected to the intake end of the compressor and the evaporation module, the indoor fan coil is connected to the high-pressure circulation pipe by a first branch pipe, to the low-pressure circulation pipe by a second branch pipe and to the medium-pressure circulation pipe by a third branch pipe, a first solenoid valve is provided in the first branch pipe and a second solenoid valve is provided in the second branch pipe.

[0007] Furthermore, the third branch pipe is provided with an electronic expansion valve.

[0008] In addition, when some indoor fan coils need to be cooled, the first solenoid valve of the cooling indoor fan coil is closed, and the refrigerant in the liquid storage tank passes through the medium pressure circulation pipe, electronic expansion valve, indoor fan coil, second solenoid valve, and low pressure circulation pipe in sequence to complete the cooling circulation; For other indoor fan coils, when heating is required, the second solenoid valve of the heating indoor fan coil is closed, and the high-temperature refrigerant at the exhaust end of the compressor passes through the high-pressure circulation pipe, the first solenoid valve, the indoor fan coil, the electronic expansion valve, the evaporator module, and the low-pressure circulation pipe in sequence to complete the heating circulation.

[0009] In addition, a temperature sensor and a pressure sensor are provided at the exhaust end of the compressor, a temperature sensor is provided at the intake end of the compressor, a temperature sensor is provided in the pipeline between the condenser and the liquid storage tank, a solenoid valve and a capillary tube are further provided in the pipeline between the liquid storage tank and the compressor, temperature sensors are provided at both the inlet end and outlet end of the indoor fan coil, and pressure sensors are provided in the medium pressure circulation pipe and the low pressure circulation pipe, respectively.

[0010] Furthermore, a first constant pressure valve is provided in a connecting pipe between the exhaust end of the compressor of the condensing module and the condenser, and a second constant pressure valve is provided in a pipe between the condenser and the liquid storage tank.

[0011] Furthermore, the multi-type central air conditioning system further includes a floor heating piping and / or a hot water supply piping; The floor heating pipe is connected to the high pressure circulation pipe and the medium pressure circulation pipe, and an electronic expansion valve is provided in the connecting pipe between the floor heating pipe and the medium pressure circulation pipe, and a manual shutoff valve is provided in the connecting pipe between the floor heating pipe and the high pressure circulation pipe, The hot water supply pipe is connected to a high pressure circulation pipe and a medium pressure circulation pipe, and an electronic expansion valve is provided in the connecting pipe between the hot water supply pipe and the medium pressure circulation pipe, and a manual shutoff valve is provided in the connecting pipe between the hot water supply pipe and the high pressure circulation pipe.

[0012] Furthermore, the evaporation module is a freeze-thaw circulation type evaporator, which includes an infrared collector, a heat collection end, an energy tank and a heat exchanger. A freezing and thawing medium is stored in the energy tank, the heat collecting end and the heat exchanger are provided in the energy tank, and both ends of the heat exchanger are connected to refrigerant circulation pipes, respectively.

[0013] Furthermore, the medium-pressure circulation pipe is connected to an infrared heat collecting plate, and a fourth control valve is provided between the medium-pressure circulation pipe and the infrared heat collecting plate, the infrared heat collecting plate is connected to a heat collecting end, the other end of which is connected to a low-pressure circulation pipe, the high-pressure circulation pipe is connected to a first control valve, the first control valve is connected to a heat exchanger and a second control valve, the other end of the second control valve is connected to the low-pressure circulation pipe, the other end of the heat exchanger is connected to a third control valve, and the third control valve is connected to the medium-pressure circulation pipe.

[0014] Furthermore, the refrigerant is selected from freon, ammonia, and carbon dioxide.

[0015] Furthermore, the refrigerant is selected as the single circulating material, carbon dioxide, and the condenser is a flash evaporator, which includes a sealed housing, a negative pressure fan, and a heat exchange means. The negative pressure fan is provided in the ceiling of the sealed housing and is used to create negative pressure within the sealed housing. A plurality of heat exchange means are provided within the sealed housing so as to be overlapped. The heat exchange means includes a water atomizer, a multiple discharge coil pipe through which refrigerant circulates, and fins for fixing the multiple discharge coil pipe. The multiple discharge coil pipe and fins are fixed with fixing metal fittings. Carbon dioxide flows in from the inlet end and is discharged from the outlet end. The water atomizer is connected to a water source and atomizes the water. Effect of the Invention

[0016] The present invention includes the following advantages: The entire multi-type central air conditioning system of the present invention dissipates heat through a condenser and absorbs heat through an infrared radiation collector. When some areas are heated in summer or some rooms are cooled in winter, the refrigerant circulates through switching solenoid valves and medium pressure circulation pipes, providing the multi-type central air conditioning system of the present invention with multiple operating modes (independent cooling / independent heating / simultaneous operation of local cooling and local heating), thereby increasing the diversity of the overall operating conditions of the multi-type central air conditioning system without adding complex refrigerant switching pipelines. The multi-type central air conditioning system of the present invention can provide heating and cooling at the same time, simultaneously solving people's different needs for comfort, and achieving cooling and heating for each of the different indoor units in one set of multi-type central air conditioning system.

[0017] In addition, the condensation module and the evaporation module can function as balancers for the entire multi-type central air conditioning system, balancing parameters such as the operating pressure during the operation of the air conditioners, and ensuring efficient and stable operation of the multi-type central air conditioning system, which is also an important effect of the present invention. [Brief description of the drawings]

[0018] [Figure 1] 1 is a schematic diagram of a multi-type central air conditioning system capable of simultaneously operating heating and cooling according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a structural diagram of a flash evaporator. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The invention will now be explained in more detail with reference to the following examples and figures, whereby the examples are merely intended to provide an understanding of the invention.

[0020] Referring to FIG. 1 , the multi-type central air conditioning system provided by this embodiment, which is capable of simultaneously operating heating and cooling, includes a condensation module 1, a plurality of indoor fan coils 2, a high-pressure circulation pipe 3, a medium-pressure circulation pipe 4, a low-pressure circulation pipe 5 and an evaporation module 6. The condensation module 1 includes a compressor 10, a condenser 11, and a liquid storage tank 12, which are connected in sequence. The high-pressure circulation pipe 3 is connected to the exhaust end of the compressor 10 and the evaporation module 6, and distributes the high-pressure, high-temperature refrigerant discharged from the compressor 10. The medium-pressure circulation pipe 4 is connected to the liquid storage tank 12 and the evaporation module 6, and distributes the medium-pressure refrigerant discharged from the multiple indoor fan coils 2. The low-pressure circulation pipe 5 is connected to the intake end of the compressor 10 and the evaporation module 6, and distributes the low-pressure refrigerant. The indoor fan coil 2 is connected to the high-pressure circulation pipe 3 by a first branch pipe 23, to the low-pressure circulation pipe 5 by a second branch pipe 24, and to the medium-pressure circulation pipe 4 by a third branch pipe 25. The first branch pipe 23 is provided with a first solenoid valve 20, the second branch pipe 24 is provided with a second solenoid valve 21, and the third branch pipe 25 is provided with an electronic expansion valve 22.

[0021] Referring to FIG. 1, when the A1-An indoor fan coil 2 needs to cool and the B1-Bn indoor fan coil 2 needs to heat during the same time period, the first solenoid valve 20 of the A1-An indoor fan coil 2 closes, and the refrigerant in the liquid storage tank 12 passes through the medium pressure circulation pipe 4, the electronic expansion valve 22, the indoor fan coil 2, the second solenoid valve 21, and the low pressure circulation pipe 5 in order to complete the cooling circulation; in this case, the second solenoid valve 21 of the B1-Bn indoor fan coil 2 closes, and the high temperature refrigerant at the exhaust end of the compressor 10 passes through the high pressure circulation pipe 3, the first solenoid valve 20, the indoor fan coil 2, the electronic expansion valve 22, the evaporative module 6, and the low pressure circulation pipe 5 in order to complete the heating circulation.

[0022] The entire multi-type central air conditioning system of the present invention dissipates heat through the condenser 11 and absorbs heat through the freeze-thaw circulation type evaporator. When some areas are heated in summer or some rooms are cooled in winter, the refrigerant circulates through the switching of the solenoid valve and the medium pressure circulation pipe 4. The multi-type central air conditioning system of the present invention is equipped with multiple operating modes (independent cooling / independent heating / simultaneous operation of local cooling and local heating), which increases the diversity of the overall operating conditions of the multi-type central air conditioning system without adding complex refrigerant switching pipes. The multi-type central air conditioning system of the present invention can provide heating and cooling at the same time, simultaneously solving people's different needs for comfort, and achieving cooling and heating for different indoor units in one set of system.

[0023] Referring to FIG. 1, a first constant pressure valve 14 is provided in the connecting pipe between the exhaust end of the compressor 10 of the condensing module 1 and the condenser 11. The constant pressure valve between the compressor 10 and the flash evaporator operates in winter to keep the exhaust pressure constant at a pressure corresponding to the maximum COP, and opens in summer to protect the pipe. A second constant pressure valve 15 is provided in the pipeline between the condenser 11 and the liquid storage tank 12, and the constant pressure valve between the flash evaporator and the liquid storage tank 12 keeps the pressure of the liquid storage tank 12 constant within a predetermined range, for example, 60 to 65 bar. A temperature sensor 13 and a pressure sensor 16 are provided at the exhaust end of the compressor 10, a temperature sensor 13 is provided at the intake end of the compressor 10, a temperature sensor 13 is provided in the pipe between the condenser 11 and the liquid storage tank 12, a solenoid valve and a capillary tube 17 are further provided in the pipe between the liquid storage tank 12 and the compressor 10, temperature sensors 13 are provided at both the inlet end and outlet end of the indoor fan coil 2, and a pressure sensor 16 is provided in the medium pressure circulation pipe 4 and the low pressure circulation pipe 5, respectively. The capillary tube 17 has a throttling and pressure reducing effect, preventing the liquid refrigerant in the liquid storage tank 12 from evaporating too much. The temperature sensor 13 and the pressure sensor 16 collect temperature data and pressure data of each major node, and use the collected data as the basis for controlling the opening degree of the compressor, the fan, the solenoid valve and the electronic expansion valve, thereby improving the operating efficiency of the multi-type central air conditioning system.

[0024] Referring to FIG. 1, the multi-type central air conditioning system further includes a floor heating piping 7. This floor heating piping 7 is connected to the high pressure circulation pipe 3 and the medium pressure circulation pipe 4, and an electronic expansion valve 22 is provided in the connecting pipe between the floor heating piping 7 and the medium pressure circulation pipe 4, and a manual shutoff valve 9 is provided in the connecting pipe between the floor heating piping 7 and the high pressure circulation pipe 3. The multi-type central air conditioning system further includes a hot water supply pipe 8. This hot water supply pipe 8 is connected to the high pressure circulation pipe 3 and the medium pressure circulation pipe 4, and an electronic expansion valve 22 is provided in the connecting pipe between the hot water supply pipe 8 and the medium pressure circulation pipe 4, and a manual shutoff valve 9 is provided in the connecting pipe between the hot water supply pipe 8 and the high pressure circulation pipe 3. When generating hot water by heating the floor, the manual shutoff valve 9 is opened, and the high-temperature refrigerant at the exhaust end of the compressor 10 passes through the high-pressure circulation pipe 3, the manual shutoff valve 9, the floor heating pipe 7 / hot water supply pipe 8, the electronic expansion valve 22, the evaporation module 6, and the low-pressure circulation pipe 5 in order to complete the heating circulation.

[0025] Referring to FIG. 1, the evaporation module is a freeze-thaw circulation type evaporator, which includes an infrared collector 60 , a heat collection end 61 , an energy tank 62 and a heat exchanger 63 . A freezing and thawing medium is stored in this energy tank 62, and the heat collection end 61 and the heat exchanger 63 are provided in the energy tank 62. Both ends of the heat exchanger 63 are connected to refrigerant circulation pipes, and after the low-temperature refrigerant passes through the heat exchanger 63, it exchanges heat with the freezing and thawing medium. The infrared collector 60 stores the absorbed solar energy in an energy tank 62 and extracts heat from the freeze-thaw medium according to need. The freeze-thaw medium is a phase change energy storage material, for example, water. Turning 0°C water into 0°C ice requires the release of a large amount of heat, and water is a cheap and environmentally friendly substance, further reducing costs.

[0026] Specifically, the medium-pressure circulation pipe 4 is connected to an infrared collector 60, a fourth control valve 67 is provided between the medium-pressure circulation pipe 4 and the infrared collector 60, the infrared collector 60 is connected to a heat collection end 61, the other end of the heat collection end 61 is connected to the low-pressure circulation pipe 5, and the high-pressure circulation pipe 3 is connected to a first control valve 64. The first control valve 64 is connected to a heat exchanger 63 and a second control valve 65, the other end of the second control valve 65 is connected to the low-pressure circulation pipe 5, and the other end of the heat exchanger 63 is connected to a third control valve 66, which is connected to the medium-pressure circulation pipe 4.

[0027] When the heating mode is predominant, at night, the second control valve 65, the third control valve 66 and the fourth control valve 67 are first opened and the first control valve 64 is closed; in the cooling mode, the heat stored in the energy tank 62 during the day is extracted and used to heat the room; when the medium in the energy tank 62 reaches the phase change temperature, the first control valve 64 is opened and the second control valve 65 is closed, while the third control valve 66 and the fourth control valve 67 are still kept open, and the high-temperature exhaust heat is transferred to the intake end via the medium in the energy tank 62, thereby maintaining the stable operation of the multi-type central air conditioning system. During the day, the first control valve 64, the second control valve 65, and the third control valve 66 are closed and the fourth control valve 67 is opened, and the superheated return air heats the low-temperature medium in the tank through the energy tank 62. When the return air temperature becomes higher than a predetermined value, the second control valve 65 is opened and the third control valve 66 lowers the temperature of the return air.

[0028] In the present invention, light energy and air energy are stored in the energy tank 62 in a phase change manner by the phase change energy storage material, and when there is sufficient sunlight, the solar energy is used for heating, which is eco-friendly and environmentally friendly. When there is not enough sunlight, the solar collector collects some heat in the form of thermal radiation, and the air energy collector can also be used to collect heat to ensure the heating needs.

[0029] The refrigerant may be selected from fluorocarbons, ammonia, carbon dioxide, etc., and in this embodiment, carbon dioxide is preferably selected as the cooling medium of the central air conditioner. When carbon dioxide is used as a circulating material, it has the advantages of large pressure difference, good fluidity, small density, and supercritical phase transition, and its effect is more remarkable when applied to high-rise buildings. The refrigerant circulation line is connected to a single-stage carbon dioxide circulation system in which carbon dioxide is the sole circulation material. The term "single-stage" refers to a system in which no cascade is required and only carbon dioxide is circulated, as distinguished from a cascade system. The multi-type central air conditioning system of this embodiment uses carbon dioxide as its material and can cool or heat floors that are higher in vertical height. If applied to a flat floor, it can circulate the air over a greater distance, allowing more indoor units to operate.

[0030] When carbon dioxide is used as the refrigerant, referring to FIG. 2, a flash evaporator is preferred in place of the condenser 11, and includes a sealed housing 110, a negative pressure fan 111 and a heat exchange means 112. This negative pressure fan 111 is provided in the ceiling of the sealed housing 110 and creates a negative pressure inside the sealed housing 110. A plurality of heat exchange means 112 are provided inside the sealed housing 110 so as to be overlapped. The heat exchange means 112 includes a water atomizer 113, a multiple exhaust coil pipe through which the refrigerant circulates, and fins for fixing the multiple exhaust coil pipe. The multiple exhaust coil pipe and the fins are fixed with fixing metal fittings. Carbon dioxide flows in from the inlet end and is discharged from the outlet end. The multiple exhaust coil pipes of the plurality of heat exchange means 112 are connected in series to each other. The water atomizer 113 is connected to a water source and atomizes the water. The mist water accumulates in the cavity of the sealed housing 110, and after the liquid micelles and the carbon dioxide in the multiple exhaust coil pipe complete radiation and heat exchange due to the effect of negative pressure, it is extracted from the sealed housing 110 by the negative pressure fan 111. During cooling, when the water micelles in the cavity absorb the radiant heat of the carbon dioxide circulating in the multiple exhaust coil pipe, the larger micelles gradually decompose into smaller micelles, absorbing the heat and condensing the carbon dioxide refrigerant into a liquid. The water micelles dynamically and continuously break down into smaller water micelles and remove heat. The ultrasonic atomized water itself has a descaling function, which avoids the formation of scale on the surfaces of the heat exchange tubes and fins. The water vapor after the heat exchange is completed is not circulated or recovered but is directly discharged into the atmosphere. During the process of decomposition of water micelles, heat is mainly converted into internal energy, and the temperature of the discharged water vapor is not high, so the heat island effect does not occur. Stacking multiple heat exchange means 112 facilitates installation and repair; if one heat exchange means 112 breaks, the broken means can be individually removed and repaired or replaced. Unlike conventional air-cooled heat exchangers, the flash evaporator performs heat exchange within a sealed housing 110, with almost no wind entering, and when the outside temperature and humidity are both high, the heat exchange effect is not affected by the temperature and humidity of the natural wind outside.

[0031] Finally, the above embodiments are merely for the purpose of illustrating the present invention and do not limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can understand that amendments or equivalent replacements can be made to the present invention without departing from the essence and scope of the present invention. [Explanation of symbols]

[0032] 1. Condensation module 10 Compressor 11 Condenser 110 Sealed housing 111 Negative pressure fan 112...Heat exchange means 113...Water atomizer 12 Liquid storage tank 13 Temperature Sensor 14 First constant pressure valve 15 Second constant pressure valve 16 Pressure Sensor 17 Capillary 2. Indoor fan coil 20 First solenoid valve 21 Second solenoid valve 22 Electronic Expansion Valve 23 First branch pipe 24 Second branch pipe 25 Third branch pipe 3 High pressure flow pipe 4. Medium pressure distribution pipe 5. Low pressure flow pipe 6 Evaporation module 60...Infrared heat collector 61 Heat collecting end 62 Energy Tank 63...heat exchanger 64 First control valve 65 Second control valve 66 Third control valve 67 Fourth control valve 7. Underfloor heating piping 8. Hot water supply piping 9. Manual shutoff valve

Claims

1. A multi-type central air conditioning system capable of simultaneously operating heating and cooling, comprising a condensation module, a plurality of indoor fan coils, a high-pressure circulation pipe, a medium-pressure circulation pipe, a low-pressure circulation pipe, and an evaporation module, the condensation module includes a compressor, a condenser, and a liquid storage tank connected in series; The high-pressure circulation pipe is connected to the exhaust end of the compressor, the medium pressure flow pipe is connected to the liquid storage tank and the evaporation module; The low pressure flow pipe is connected to the intake end of the compressor and the evaporation module, The indoor fan coil is connected to the high-pressure circulation pipe by a first branch pipe, to the low-pressure circulation pipe by a second branch pipe, and to the medium-pressure circulation pipe by a third branch pipe; The first branch pipe is provided with a first solenoid valve, A multi-type central air conditioning system capable of simultaneously operating heating and cooling, wherein the second branch pipe is provided with a second solenoid valve.

2. 2. The multi-type central air conditioning system capable of simultaneously operating heating and cooling according to claim 1, wherein the third branch pipe is provided with an electronic expansion valve.

3. When some indoor fan coils need to be cooled, the first solenoid valve of the cooling indoor fan coil is closed, and the refrigerant in the liquid storage tank passes through the medium pressure circulation pipe, the electronic expansion valve, the indoor fan coil, the second solenoid valve, and the low pressure circulation pipe in sequence to complete the cooling circulation; 2. A multi-type central air conditioning system capable of simultaneously operating cooling and heating, as claimed in claim 1, characterized in that, when the other indoor fan coils need to be heated, the second solenoid valve of the heating indoor fan coil is closed, and the high-temperature refrigerant at the exhaust end of the compressor passes through the high-pressure circulation pipe, the first solenoid valve, the indoor fan coil, the electronic expansion valve, the evaporator module, and the low-pressure circulation pipe in order to complete the heating circulation.

4. A temperature sensor and a pressure sensor are provided at the exhaust end of the compressor, A temperature sensor is provided at the intake end of the compressor, a temperature sensor is provided in a pipe between the condenser and the liquid storage tank; A solenoid valve and a capillary tube are further provided in a pipeline between the liquid storage tank and the compressor, A temperature sensor is provided at each of the inlet and outlet ends of the indoor fan coil.

2. The multi-type central air conditioning system capable of simultaneously operating heating and cooling according to claim 1, wherein the medium pressure circulation pipe and the low pressure circulation pipe are each provided with a pressure sensor.

5. a first constant pressure valve is provided in a connecting pipe between the exhaust end of the compressor and the condenser of the condensation module; 5. The multi-type central air conditioning system capable of simultaneously operating heating and cooling as claimed in claim 4, wherein a second constant pressure valve is provided in a pipeline between the condenser and the liquid storage tank.

6. The multi-type central air conditioning system further includes a floor heating piping and / or a hot water supply piping; The floor heating piping is connected to the high pressure circulation pipe and the medium pressure circulation pipe, An electronic expansion valve is provided in the connecting pipe between the floor heating pipe and the medium pressure distribution pipe, A manual shutoff valve is provided in the connecting pipe between the floor heating pipe and the high-pressure distribution pipe, The hot water supply pipe is connected to the high pressure circulation pipe and the medium pressure circulation pipe, an electronic expansion valve is provided in a connecting pipe between the hot water supply pipe and the medium pressure distribution pipe; 2. The multiple type central air conditioning system capable of simultaneously operating heating and cooling according to claim 1, wherein a manual shutoff valve is provided in a connecting pipe between the hot water supply pipe and the high pressure circulation pipe.

7. The evaporation module is a freeze-thaw circulation type evaporator; The freeze-thaw circulation type evaporator includes an infrared collector, a heat collection end, an energy tank, and a heat exchanger; A freezing and thawing medium is stored in the energy tank; The heat collecting end and the heat exchanger are provided in the energy tank, 2. The multiple type central air conditioning system capable of simultaneously operating heating and cooling as claimed in claim 1, wherein both ends of the heat exchanger are connected to refrigerant circulation lines.

8. The medium pressure flow pipe is connected to an infrared heat collecting plate, a fourth control valve is provided between the medium pressure flow pipe and the infrared heat collecting plate; The infrared heat collecting plate is connected to the heat collecting end, The other end of the heat collecting end is connected to a low pressure flow pipe, The high pressure flow pipe is connected to a first control valve, The first control valve is connected to a heat exchanger and a second control valve, The other end of the second control valve is connected to the low-pressure circulation pipe, The other end of the heat exchanger is connected to a third control valve; 8. The multi-type central air conditioning system according to claim 7, wherein the third control valve is connected to the medium pressure circulation pipe.

9. 2. A multi-type central air conditioning system capable of simultaneously operating heating and cooling as claimed in claim 1, wherein the refrigerant is selected from the group consisting of fluorocarbon, ammonia and carbon dioxide.

10. The refrigerant is selected as the single circulation material, and the condenser is a flash evaporator; The flash evaporator includes a sealed housing, a negative pressure fan, and a heat exchange means; the negative pressure fan is provided on a ceiling of the sealed housing and serves to create a negative pressure within the sealed housing; The heat exchange means are provided in the sealed housing so as to be overlapped with each other, The heat exchange means includes a water atomizer, a multi-discharge coil pipe through which a refrigerant flows, and a fin for fixing the multi-discharge coil pipe; The multiple exhaust coil pipe and the fins are fixed by a fixing metal fitting, The carbon dioxide flows in through an inlet end and exits through an outlet end; 2. The multi-type central air conditioning system according to claim 1, wherein the water atomizer is connected to a water source to atomize water.

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