Radiant air conditioning system

Abstract

The present invention provides a radiant air conditioning system. The radiant air conditioning system includes a radiant air conditioning panel, an indoor heat exchanger, an electronic expansion valve, a radiant air conditioning panel solenoid valve, and a heat exchanger solenoid valve. The controller is configured to: upon receiving a power-on signal, close the radiant air conditioning panel solenoid valve and open the heat exchanger solenoid valve; when the difference ΔT between the indoor ambient temperature and a preset indoor ambient temperature falls within a target temperature range [ΔT1, ΔT2], and when the evaporating temperature is not less than the dew point compensation temperature, and if the compressor frequency is not less than a preset compressor frequency f2, close the radiant air conditioning panel solenoid valve and open the heat exchanger solenoid valve; if the compressor frequency is less than f2 and greater than or equal to f1, open the radiant air conditioning panel solenoid valve and open the heat exchanger solenoid valve; if the compressor frequency is less than f1, first open the radiant air conditioning panel solenoid valve and the heat exchanger solenoid valve; and if the compressor frequency is less than f1 again, open the radiant air conditioning panel solenoid valve and close the heat exchanger solenoid valve. The control logic is relatively simple, as f2 is greater than f1.

Description

Technical Field

[0001] The present invention relates to the technical field of air treatment devices, and in particular to a radiation air conditioning system. Background Art

[0002] With the rapid development of radiant air-conditioning systems, people have put forward simpler requirements for the control of radiant air-conditioning systems.

[0003] Radiant air conditioning systems include radiant air conditioning and convection air conditioning.

[0004] Radiant air conditioners include radiant panels, which radiate heat into the interior space. These panels provide cooling or heating to the human body, indoor objects, and maintenance structures through radiant heat exchange.

[0005] Convection air conditioners, such as ducted units, change indoor temperature and humidity by blowing out cool or hot air. They consist of an indoor fan and indoor heat exchanger. The indoor fan drives air through the indoor heat exchanger, where it absorbs heat or cold, and then blows it into the indoor space, where it transfers heat to the human body and objects within.

[0006] Because radiant air conditioning uses radiant panels in the room to transfer heat, rather than introducing cold or hot air into the room, it creates a more comfortable experience for the human body. However, radiant panels can only carry a small load, so radiant air conditioning is often combined with convection air conditioning to meet varying load requirements.

[0007] Since the distance between the radiant air conditioning panel and the human body is relatively close, in order to reduce the user's discomfort, when the radiant air conditioning system is in cooling mode, the temperature of the radiant air conditioning panel is higher than the temperature of the air-conditioning wind of the convection air conditioning. This results in a smaller amount of cooling that can be provided by the radiant air conditioning panel per unit area. If you want to meet the load demand, you can only expand the area of ​​the radiant air conditioning panel.

[0008] When the radiation air-conditioning panel is at a low temperature, condensation is likely to occur on the radiation air-conditioning panel, affecting the radiation effect of the radiation air-conditioning panel.

[0009] In the prior art, to reduce the probability of condensation on radiant air conditioning panels, some radiant air conditioning systems adjust the fresh air volume and dehumidification capacity according to seasonal usage requirements, set up main and bypass air ducts, and use valves to control the opening of different air ducts to reduce condensation on the radiant air conditioning panels. Other air conditioners have refrigerant outlet pipes divided into different pipe sections, and the valves in the system are opened or closed according to the inlet and outlet temperatures of different pipe sections to achieve regulation of the radiant air conditioning system. Existing radiant air conditioning systems often have relatively complex control steps and are less effective in reducing condensation on radiant air conditioning panels, affecting the normal use of the radiant air conditioning system and providing users with a poor user experience. Summary of the Invention

[0010] The present invention solves one of the technical problems in the related art at least to a certain extent.

[0011] To this end, the present application aims to provide a radiant air conditioning system.

[0012] The radiant air conditioning system according to the present application comprises:

[0013] A radiant air conditioning panel is provided indoors and has at least one;

[0014] An indoor heat exchanger is provided indoors and has at least one;

[0015] compressor;

[0016] an outdoor heat exchanger, which is located in an outdoor space;

[0017] An electronic expansion valve, the indoor heat exchanger and the radiant air conditioning panel are connected in parallel to form a first parallel pipeline, and the electronic expansion valve is connected between the first parallel pipeline and the outdoor heat exchanger;

[0018] The radiant air conditioning panel solenoid valve has one solenoid valve, which is arranged in the first parallel pipeline and connected to the main input pipe of the radiant air conditioning panel;

[0019] Heat exchanger solenoid valves, the number of which is the same as the number of indoor heat exchangers, are arranged in the first parallel branch and connected to the branch input pipe of each heat exchanger;

[0020] An indoor temperature detection device, which is installed in the indoor space;

[0021] a pressure detection device for measuring the pressure of the evaporation inlet section and the pressure of the evaporation outlet section of the first parallel pipeline;

[0022] The controller is configured as:

[0023] After receiving the power-on signal, close the radiation air conditioning panel solenoid valve and open the heat exchanger solenoid valve;

[0024] Based on the indoor ambient temperature value uploaded by the indoor temperature detection device, calculating the difference between the indoor ambient temperature value and the preset indoor ambient temperature value, and defining it as a first temperature difference;

[0025] When the first temperature difference ΔT falls within the target temperature range [ΔT1, ΔT2], the evaporation temperature is calculated based on the evaporation inlet section pressure and the evaporation outlet section pressure in combination with the first logic;

[0026] When the evaporation temperature is not less than the dew point compensation temperature,

[0027] If the compressor frequency is not less than the preset compressor frequency f2, the radiant air conditioning panel solenoid valve is closed and the heat exchanger solenoid valve is opened;

[0028] If the compressor frequency is less than f2 and the compressor frequency is greater than or equal to f1, the radiant air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is opened;

[0029] If the compressor frequency is less than f1, the radiation air conditioning panel solenoid valve and the heat exchanger solenoid valve are opened first. If the compressor frequency is detected to be less than f1 again, the radiation air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is closed.

[0030] Among them, f2>f1.

[0031] In some embodiments of the present application, if the compressor frequency is less than f2 and the compressor frequency is greater than or equal to f1, the radiation air conditioning panel solenoid valve is opened, and the heat exchanger solenoid valve is opened. When the opening time of the radiation air conditioning panel and the heat exchanger solenoid valve reaches t2, if the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is not less than the preset difference X1, the radiation air conditioning panel solenoid valve is closed and the heat exchanger solenoid valve is opened.

[0032] In some embodiments of the present application, if the compressor frequency is less than f2 and the compressor frequency is greater than or equal to f1, the radiation air conditioning panel solenoid valve is opened, the heat exchanger solenoid valve is opened, and the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature, if the change rate a when the difference ΔT = 0 is not less than the preset temperature difference change rate a1, the radiation air conditioning panel solenoid valve is closed and the heat exchanger solenoid valve is opened.

[0033] In some embodiments of the present application, if the compressor frequency is less than f2 and the compressor frequency is greater than or equal to f1, the radiation air conditioning panel solenoid valve is opened, and the heat exchanger solenoid valve is opened. When the opening time of the radiation air conditioning panel and the heat exchanger solenoid valve reaches t2, when the evaporation temperature is lower than the dew point compensation temperature, the radiation air conditioning panel solenoid valve is closed and the heat exchanger solenoid valve is opened.

[0034] In some embodiments of the present application, the dew point compensation temperature is the sum of the dew point temperature and a preset difference ΔT3, where ΔT3 ≥ 0.

[0035] In some embodiments of the present application, if the compressor frequency is less than f1, and the compressor frequency is again detected to be less than f1 during operation, and the evaporation temperature is not less than the dew point compensation temperature, the radiant air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is closed.

[0036] When the opening time of the radiation air conditioning panel solenoid valve reaches t3, the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is not less than the preset difference X2, the radiation air conditioning panel solenoid valve is opened, and the heat exchanger solenoid valve is opened.

[0037] In some embodiments of the present application, if the compressor frequency is less than f1, and the compressor frequency is again detected to be less than f1 during operation, and the evaporation temperature is not less than the dew point compensation temperature, the radiant air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is closed.

[0038] When the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is 0 and the change rate a is not less than the preset temperature difference change rate a2, the radiation air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is opened.

[0039] In some embodiments of the present application, if the compressor frequency is less than f1, and the compressor frequency is again detected to be less than f1 during operation, and the evaporation temperature is not less than the dew point compensation temperature, the radiant air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is closed.

[0040] When the opening time of the radiation air conditioning panel solenoid valve reaches t3, when the evaporation temperature is lower than the dew point compensation temperature, the radiation air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is opened.

[0041] The radiant air conditioning system according to the present application comprises:

[0042] A radiant air conditioning panel is provided indoors and has at least one;

[0043] An indoor heat exchanger is provided indoors and has at least one;

[0044] compressor;

[0045] an outdoor heat exchanger, which is located in an outdoor space;

[0046] An electronic expansion valve, the indoor heat exchanger and the radiant air conditioning panel are connected in parallel to form a first parallel pipeline, and the electronic expansion valve is connected between the first parallel pipeline and the outdoor heat exchanger;

[0047] The radiant air conditioning panel solenoid valve has one solenoid valve, which is arranged in the first parallel pipeline and connected to the main input pipe of the radiant air conditioning panel;

[0048] Heat exchanger solenoid valves, the number of which is the same as the number of indoor heat exchangers, are arranged in the first parallel branch and connected to the branch input pipe of each heat exchanger;

[0049] An indoor temperature detection device, which is installed in the indoor space;

[0050] a pressure detection device for measuring the pressure of the evaporation inlet section and the pressure of the evaporation outlet section of the first parallel pipeline;

[0051] The controller is configured as:

[0052] After receiving the power-on signal, close the radiation air conditioning panel solenoid valve and open the heat exchanger solenoid valve;

[0053] Based on the indoor ambient temperature value uploaded by the indoor temperature detection device, calculating the difference between the indoor ambient temperature value and the preset indoor ambient temperature value, and defining it as a first temperature difference;

[0054] When the first temperature difference ΔT falls within the target temperature range [ΔT1, ΔT2], the evaporation temperature is calculated based on the evaporation inlet section pressure and the evaporation outlet section pressure in combination with the first logic;

[0055] When the evaporation temperature is not less than the dew point compensation temperature, the compressor is divided into high capacity segment, medium capacity segment and low capacity segment according to the frequency of the compressor, and the compressor switches between different capacity segments to meet the indoor load demand;

[0056] When the compressor is running in the high capacity section, the radiation air conditioning panel solenoid valve is closed and the heat exchanger solenoid valve is opened; when the compressor is running in the medium capacity section, the radiation air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is opened; when the compressor is running in the low capacity section and the compressor frequency is detected in the low capacity section for many times, the radiation air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is closed;

[0057] If the heat exchanger solenoid valve is opened or closed j times during the compressor operation time t4, then during the next operation time t5, the heat exchanger solenoid valve begins to open and shields the signals sent by the control program for other heat exchanger solenoid valves.

[0058] In some embodiments of the present application, if the radiation air conditioning panel solenoid valve is opened or closed k times within the compressor operation time t6, then within the next operation time t7, the radiation air conditioning panel solenoid valve is closed and other signals sent by the control program of the radiation air conditioning panel solenoid valve are shielded.

[0059] This application has at least the following positive effects:

[0060] The present invention provides a radiant air conditioning system. The radiant air conditioning system includes a radiant air conditioning panel, an indoor heat exchanger, an electronic expansion valve, a radiant air conditioning panel solenoid valve, and a heat exchanger solenoid valve. The controller is configured to: upon receiving a power-on signal, close the radiant air conditioning panel solenoid valve and open the heat exchanger solenoid valve; when the difference ΔT between the indoor ambient temperature and a preset indoor ambient temperature falls within a target temperature range [ΔT1, ΔT2], and when the evaporating temperature is not less than the dew point compensation temperature, and if the compressor frequency is not less than a preset compressor frequency f2, close the radiant air conditioning panel solenoid valve and open the heat exchanger solenoid valve; if the compressor frequency is less than f2 and greater than or equal to f1, open the radiant air conditioning panel solenoid valve and open the heat exchanger solenoid valve; if the compressor frequency is less than f1, first open the radiant air conditioning panel solenoid valve and the heat exchanger solenoid valve; and if the compressor frequency is less than f1 again, open the radiant air conditioning panel solenoid valve and close the heat exchanger solenoid valve. If f2 > f1, the control logic is relatively simple. The radiation air-conditioning system of the present application only needs to open or close the radiation air-conditioning panel expansion valve and the heat exchanger expansion valve, and only needs to receive electrical signals from the pressure sensor, the indoor temperature detection device, and the indoor humidity detection device. The number of sensors required is small, the cost is low, and the adjustment method is simple. The opening and closing of the radiation air-conditioning panel expansion valve and the heat exchanger expansion valve are adjusted according to the capacity segment of the compressor frequency. The condensation risk of the radiation air-conditioning panel is judged according to the capacity segment, so that the radiation air-conditioning system can meet the load requirements and reduce the condensation risk, thereby optimizing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0062] Figure 1 is a system schematic diagram of a radiant air conditioning system according to an embodiment of the present application;

[0063] Figure 2 is a schematic diagram of electrical connections between a controller and components of a radiant air conditioning system according to an embodiment of the present application;

[0064] Figure 3 is a control flow chart of a radiant air conditioning system according to an embodiment of the present application;

[0065] Figure 4 is a control flow chart of a radiant air conditioning system according to an embodiment of the present application when the compressor is operating in a medium capacity range;

[0066] Figure 5is another control flow chart of the radiant air conditioning system according to an embodiment of the present application when the compressor is operating in the medium capacity range;

[0067] Figure 6 is another control flow chart of the radiant air conditioning system according to an embodiment of the present application when the compressor is operating in the medium capacity range;

[0068] Figure 7 is a system principle diagram of a radiant air conditioning system according to another embodiment of the present application;

[0069] Figure 8 is a schematic diagram of electrical connections between a controller and components of a radiant air conditioning system according to another embodiment of the present application;

[0070] Figure 9 is a partial control flow chart of a radiant air conditioning system according to another embodiment of the present application;

[0071] Figure 10 is a partial control flow chart of a radiant air conditioning system according to another embodiment of the present application;

[0072] In the above figures: 100, radiant air-conditioning system; 11, air-conditioning indoor unit; 12, air-conditioning outdoor unit; 21, radiant air-conditioning panel; 22, indoor heat exchanger; 3, outdoor heat exchanger; 4, electronic expansion valve; 41, first electronic expansion valve; 42, second electronic expansion valve; 51, radiant air-conditioning panel solenoid valve; 52, heat exchanger solenoid valve; 61, first pressure sensor; 62, second pressure sensor; 7, first parallel pipeline; 71, first main input pipeline; 72, second main input pipeline; 81, four-way valve; 82, compressor; 83, oil separator; 84, oil separator valve; 85, gas-liquid separator. DETAILED DESCRIPTION

[0073] The present invention is described in detail below by way of exemplary embodiments, but it should be understood that elements, structures, and features of one embodiment may be beneficially combined in other embodiments without further description.

[0074] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0075] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0076] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections via an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0077] In the following, reference will be made to the Figure 1-10 The embodiments of the present application are described in detail.

[0078] The radiant air conditioning system 100 includes an air conditioning indoor unit 11 and an air conditioning outdoor unit 12 .

[0079] The indoor air conditioning unit 11 includes a radiant air conditioning panel 21, an indoor heat exchanger 22, a radiant air conditioning panel solenoid valve 51 for controlling the refrigerant flow to the radiant air conditioning panel 21, and a heat exchanger solenoid valve 52 for controlling the flow of the indoor heat exchanger 22. There can be one or more radiant air conditioning panels 21, and each radiant air conditioning panel 21 is equipped with only one radiant air conditioning panel solenoid valve 51, which is located on the main inlet pipe of the radiant air conditioning panel or panels 21. That is, all radiant air conditioning panels 21 are equipped with a total of one radiant air conditioning panel solenoid valve 51.

[0080] The outdoor air conditioning unit 12 includes an outdoor heat exchanger 3, a four-way valve 81, a compressor 82, and an electronic expansion valve 4. In some embodiments, the radiant air conditioning panels 21 and the indoor heat exchanger 22 are connected in parallel, while the indoor air conditioning unit 11 and the outdoor air conditioning unit 12 are connected in series. This allows the radiant air conditioning panels 21 and the indoor heat exchanger 22 to share a single compressor 82, a single four-way valve 81, and a single electronic expansion valve 4. The number of indoor heat exchangers 22 can be adjusted based on load.

[0081] It should be noted that the radiant air conditioning system 100 includes radiant air conditioning and convection air conditioning. The radiant air conditioning includes a radiant air conditioning panel 21, and the convection air conditioning includes an indoor fan and an indoor heat exchanger 22. The outdoor side of the radiant air conditioning and convection air conditioning is the air conditioning outdoor unit 12. In some embodiments, the air conditioning outdoor unit 12 includes a compressor 82, a four-way valve 81, an electronic expansion valve 4, and at least one outdoor heat exchanger 3.

[0082] The radiant air conditioning panel 21 is connected in parallel with the indoor heat exchanger 22, forming a circuit between the indoor air conditioning unit 11 and the outdoor air conditioning unit 12. The radiant air conditioning panel and the indoor heat exchanger are located within a first parallel pipe 7, which is located inside the indoor air conditioning unit. The output end of the first parallel pipe 7 is connected to the outdoor air conditioning unit via a first output pipe, and the input end of the first parallel pipe 7 is connected to the outdoor air conditioning unit via a first input pipe.

[0083] The refrigerant flowing out of the outdoor heat exchanger 3 flows through the electronic expansion valve 4, flows through the first input pipeline, and then flows into the first parallel pipeline 7, and is divided into two flow paths. The first flow path flows into the radiation air conditioning panel 21, and the second flow path flows into the indoor heat exchanger 22.

[0084] Radiant air conditioning system 100 performs a refrigeration cycle or a heating cycle through compressor 82, a condenser, an electronic expansion valve 4, and an evaporator. These cycles involve compression, condensation, expansion, and evaporation. The refrigerant absorbs and releases heat to provide cooling or heating to the indoor space, regulating the indoor temperature.

[0085] The compressor 82 compresses the refrigerant gas to a high-temperature, high-pressure state and discharges the compressed refrigerant gas, which then flows into the condenser. The condenser condenses the compressed, high-temperature, high-pressure gaseous refrigerant into liquid refrigerant, releasing heat into the surrounding environment through the condensation process.

[0086] The liquid refrigerant flowing out of the condenser enters the electronic expansion valve 4, which expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The low-pressure liquid refrigerant flowing out of the electronic expansion valve 4 enters the evaporator. As it passes through the evaporator, it absorbs heat and evaporates into a low-temperature, low-pressure refrigerant gas. This low-temperature, low-pressure refrigerant gas returns to the compressor 82. The evaporator achieves a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material being cooled. Throughout this cycle, the air conditioner can regulate the temperature of the indoor space.

[0087] When the radiant air conditioning system 100 is in cooling mode, the refrigerant in the indoor heat exchanger 22 and the radiant panel evaporates, while the refrigerant in the outdoor heat exchanger 3 condenses. At this point, the indoor heat exchanger 22 and the radiant panel 21 function as evaporators, while the outdoor heat exchanger 3 functions as a condenser.

[0088] When the radiant air conditioning system 100 is in heating mode, the refrigerant in the indoor heat exchanger 22 and the radiant panel 21 undergoes a condensation process, while the refrigerant in the outdoor heat exchanger 3 undergoes an evaporation process. At this time, the indoor heat exchanger 22 and the radiant air conditioning panel 21 operate as condensers, while the outdoor heat exchanger 3 operates as an evaporator.

[0089] The controller is connected to the four-way valve 81. When the four-way valve 81 is powered on, the radiation air conditioning system 100 is in a heating state. When the four-way valve 81 is powered off, the radiation air conditioning system 100 is in a cooling state.

[0090] In cooling mode, the refrigerant flowing out of the outdoor heat exchanger 3 flows through the electronic expansion valve 4 and is divided into two flow paths. The first flow path flows into the radiation air conditioning panel 21, and the second flow path flows into the indoor heat exchanger 22.

[0091] Radiant air conditioning system 100 includes a controller for controlling the operation of various components of radiant air conditioning system 100 so that the components connected to the controller can perform various predetermined functions of operating radiant air conditioning system 100 .

[0092] A controller is a device that generates operational control signals based on command opcodes and timing signals, instructing the air conditioner to execute control commands. For example, in response to a user-initiated power-on or power-off command, the controller can execute the operation associated with the target selected by the power-on or power-off command.

[0093] The embodiment of the present application also provides a hardware structure diagram of a controller, wherein the controller includes a processor and, optionally, a memory and a communication interface connected to the processor. The processor, memory, and communication interface are connected via a bus.

[0094] A processor can be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. A processor can also be any other device with processing functionality, such as a circuit, a device, or a software module. A processor can also include multiple CPUs, and a processor can be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor here can refer to one or more devices, circuits, or processing cores for processing data (such as computer program instructions).

[0095] The memory may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer, and the embodiments of the present application do not impose any restrictions on this. The memory may exist independently or be integrated with the processor. Among them, the memory may contain computer program code. The processor is used to execute the computer program code stored in the memory, thereby realizing the control method of the multi-split air conditioner 100 system provided in the embodiments of the present application.

[0096] The communication interface can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area network (WLAN), etc.). The communication interface can be a module, circuit, transceiver or any device that can achieve communication.

[0097] The bus may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc.

[0098] Reference Figures 1-6 The present application provides a radiant air conditioning system 100 that can reduce the probability of condensation on the surface of a radiant air conditioning panel 21. According to the radiant air conditioning system 100 of the present application, the number of radiant air conditioning panels 21 is n, where n ≥ 1. The first flow path includes a main inlet pipe for the radiant air conditioning panel. The first flow path is divided into n first flow branches, and the n first flow branches flow through the n radiant air conditioning panels 21 respectively. The n radiant air conditioning panels 21 are connected in parallel.

[0099] It should be noted that a corresponding radiant air conditioning panel solenoid valve 51 is provided for each radiant air conditioning panel 21. Multiple radiant air conditioning panels 21 correspond to a total of one radiant air conditioning panel solenoid valve 51. One radiant air conditioning panel solenoid valve 51 can cut off or open the flow of refrigerant to all radiant air conditioning panels 21. Since the cooling capacity provided by the radiant air conditioning panels 21 is less than that provided by the indoor heat exchanger 22, the cooling capacity provided by a single radiant air conditioning panel 21 is relatively small. Therefore, it is not necessary to provide a solenoid valve for each radiant air conditioning panel 21, and cooling capacity is minimal. If a solenoid valve is provided for each radiant air conditioning panel 21, the total cost of the radiant air conditioning system 100 will be higher.

[0100] The number of indoor heat exchangers 22 is m, where m ≥ 1. The second flow path includes a main input pipe of the indoor heat exchanger. The refrigerant flowing through the middle input pipe of the indoor heat exchanger is divided into m second flow branches. The m second flow branches flow through the m indoor heat exchangers 22 respectively. The m indoor heat exchangers 22 are connected in parallel.

[0101] Each indoor heat exchanger 22 is correspondingly provided with an indoor heat exchanger 22 solenoid valve. When the number of indoor heat exchangers 22 is m, the air-conditioning indoor unit 11 is provided with m heat exchanger solenoid valves 52, including the first heat exchanger solenoid valve 52, the second heat exchanger solenoid valve 52...the mth heat exchanger solenoid valve 52.

[0102] It should be noted that the cooling or heating capacity provided by a single indoor heat exchanger 22 is relatively large, and the provision of an indoor heat exchanger 22 solenoid valve corresponding to a single indoor heat exchanger 22 is conducive to accurately controlling the output of cooling capacity, so as to meet the load while reducing cooling waste.

[0103] In some embodiments, when there are two indoor heat exchangers 22 , there are also two heat exchanger solenoid valves 52 , namely a first heat exchanger solenoid valve 52 and a second heat exchanger solenoid valve 52 .

[0104] The controller is electrically connected to the radiation air conditioning panel solenoid valve 51 and the heat exchanger solenoid valve 52 respectively. The controller outputs different currents according to a preset program to change the current in the solenoid coil of the solenoid valve to open or close the solenoid valve.

[0105] The controller is configured to: after receiving the power-on signal, close the radiation air conditioning panel solenoid valve 51 and open the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 .

[0106] When the radiation air conditioning panel solenoid valve 51 is closed, the refrigerant flowing out of the air conditioning outdoor unit 12 is blocked from entering the radiation air conditioning panel 21, thereby making the radiation air conditioning panel 21 unable to work and unable to perform radiation heat exchange with the indoor environment.

[0107] When the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened, the refrigerant flowing out of the air-conditioning outdoor unit 12 can flow into the first heat exchanger and the second heat exchanger through the pipeline, and release cold or heat to the air flow flowing through the surface of the heat exchanger.

[0108] It should be noted that the radiant air conditioning system 100 includes an indoor temperature detection device and an indoor humidity detection device arranged in the indoor space, which are used to detect the indoor ambient temperature value and the indoor ambient humidity value respectively, and upload them to the controller.

[0109] After the radiation air conditioning system 100 is turned on, under normal circumstances, the difference between the indoor ambient temperature value and the target indoor ambient temperature value is large, and the difference between the indoor ambient humidity value and the target indoor ambient humidity value is large. The radiation air conditioning system 100 needs to quickly output cooling / heating to the indoor environment to reduce the difference between the indoor ambient temperature value and the target indoor ambient temperature value, and also reduce the difference between the indoor ambient humidity value and the target indoor ambient temperature value. During this process, the convection air conditioning is turned on. Since the heat transfer efficiency of convection heat transfer is relatively high, the time of the process can be shortened.

[0110] The controller is configured to, during the above process, calculate the difference between the indoor ambient temperature value and a preset indoor ambient temperature value based on the indoor ambient temperature value uploaded by the indoor temperature detection device, and define the difference as a first temperature difference value. The controller then determines whether the first temperature difference value ΔT falls within the target temperature range [ΔT1, ΔT2]. If so, the controller determines that the indoor ambient temperature has reached a stable state. If not, the controller determines that the indoor ambient temperature is unstable, continues detecting the indoor ambient temperature value, and determines whether the indoor ambient temperature is stable based on the first temperature difference value.

[0111] Optionally, the target temperature range may be set to [-2, 2].

[0112] The radiant air conditioning system 100 includes a first pressure sensor 61 and a second pressure sensor 62, each used to detect the pressure at both ends of the evaporator. The first and second evaporator pressure sensors 61 and 62 are each electrically connected to a controller, transmitting the evaporator inlet and outlet pressures, respectively, to the controller.

[0113] The first pressure sensor 61 is installed in the pipeline connecting the evaporator and the electronic expansion valve 4 to detect the refrigerant pressure at the evaporator inlet. The refrigerant is throttled and depressurized as it flows through the electronic expansion valve 4. The refrigerant flowing out of the electronic expansion valve 4 then flows into the indoor heat exchanger 22 or the radiant air conditioning panel 21. The first pressure sensor 61 detects the refrigerant pressure entering the evaporator, that is, the refrigerant pressure at the evaporator inlet.

[0114] The second pressure sensor 62 is located on the pipeline connecting the evaporator and the air intake of the compressor 82. It is used to detect the refrigerant pressure at the evaporator outlet pipeline. The refrigerant evaporates within the evaporator and then flows into the air intake of the compressor 82, where it is compressed into high-temperature, high-pressure refrigerant. The second pressure sensor 62 detects the pressure of the refrigerant flowing out of the evaporator, that is, the refrigerant pressure at the evaporator outlet.

[0115] When the controller determines that the first temperature difference ΔT belongs to the target temperature range [ΔT1, ΔT2], that is, the indoor ambient temperature is in a stable state, the controller calculates the evaporation temperature according to the evaporation inlet section pressure, the evaporation outlet section pressure and the first logic.

[0116] Radiant air conditioning system 100 includes a humidity detection device installed in the indoor space. In some embodiments, the humidity detection device is a humidity sensor, and in other embodiments, a temperature and humidity integrated sensor. The humidity detection device is electrically connected to a controller, detects the indoor humidity, and transmits the indoor humidity value to the controller.

[0117] The controller calculates the dew point temperature based on the indoor humidity value and thermodynamic formula.

[0118] When the evaporation temperature is greater than the dew point temperature, the indoor air flow flows through the surface of the radiation air conditioning panel 21 without condensation on the surface of the radiation air conditioning panel 21 .

[0119] When the evaporation temperature is equal to the dew point temperature, due to a certain temperature difference between the outer surface temperature of the radiation air conditioning panel 21 and the evaporation temperature, the airflow has a probability of condensing on the surface of the radiation air conditioning panel 21 .

[0120] When the evaporation temperature is lower than the dew point temperature, even if there is a temperature difference between the outer surface temperature of the radiant air conditioning panel 21 and the evaporation temperature, the airflow is likely to condense on the surface of the radiant air conditioning panel 21 .

[0121] In other embodiments, when the controller determines that the indoor ambient temperature is in a stable state, the evaporation temperature is calculated based on the evaporation inlet section pressure and the evaporation outlet section pressure combined with the first logic, and the relationship between the dew point compensation temperature and the evaporation temperature is determined.

[0122] It should be noted that the dew point compensation temperature is the sum of the dew point temperature and a preset difference ΔT3. ΔT3 ≥ 0. If the evaporation temperature is greater than or equal to the dew point compensation temperature, airflow passing over the surface of the radiant air conditioning panel 21 will not condense, and the indoor humidity conditions will meet the conditions for preventing condensation on the radiant air conditioning panel 21.

[0123] First logic: According to the thermodynamic formula, the evaporation inlet section pressure and the evaporation outlet section pressure are calculated. The evaporation pressure and the evaporation temperature are in a one-to-one correspondence, and the evaporation temperature under the corresponding state can be obtained.

[0124] The controller is configured to: when the evaporation temperature is not less than the dew point compensation temperature, determine the magnitude relationship between the operating frequency of the compressor 82 and the preset compressor 82 frequency f2 and the preset compressor 82 frequency f1, wherein f2>f1.

[0125] The controller is configured as follows: if the frequency of the compressor 82 is not less than f2, the controller determines that the compressor 82 is operating in the high-capacity segment, and the higher frequency of the compressor 82 can meet the higher indoor load requirements, close the radiation air conditioning panel solenoid valve 51, and open the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52.

[0126] The controller is configured as follows: if the frequency of compressor 82 is less than f2 and the frequency of compressor 82 is greater than or equal to f1, the controller determines that the compressor 82 is in the medium capacity section, opens the radiation air conditioning panel solenoid valve 51, and opens the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52.

[0127] At this time, the indoor load is still at a high state, but it does not need to rely entirely on strong convection of convection air conditioning to meet the load. After the radiation air conditioning panel solenoid valve 51 is opened, the refrigerant flows into the radiation air conditioning panel 21, and the radiation air conditioning panel 21 performs radiation heat exchange with the indoor environment, which can reduce the load of the convection air conditioning and reduce the proportion of convection heat transfer in the total heat transfer, so that the user feels more comfortable.

[0128] In some embodiments, when the opening time of the radiation air conditioning panel solenoid valve 51 reaches t2, it is calculated whether the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is not less than the preset difference X1. If so, it is judged that the indoor ambient temperature deviates from the target indoor ambient temperature by a large margin and a larger cooling capacity needs to be output. The radiation air conditioning panel solenoid valve 51 is closed, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened. The frequency of the compressor 82 is increased to the high capacity segment to make the convection air conditioner run at high load to meet the indoor load.

[0129] In other embodiments, when the opening time of the radiation air conditioning panel solenoid valve 51 reaches t2, the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is calculated, and the change rate a when the difference ΔT = 0 is calculated, and it is determined whether a is not less than the preset temperature difference change rate a1. If so, it is determined that the indoor ambient temperature is difficult to be stably at the target indoor ambient temperature point, and a larger cooling capacity needs to be output. The radiation air conditioning panel solenoid valve 51 is closed, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened, and the frequency of the compressor 82 is increased to the high capacity segment to make the convection air conditioner run at high load to meet the indoor load.

[0130] In other embodiments, when the opening time of the radiation air-conditioning panel solenoid valve 51 reaches t2, the relationship between the evaporation temperature and the dew point compensation temperature is judged. When the evaporation temperature is lower than the dew point compensation temperature, the controller judges that condensation water is easy to condense on the surface of the radiation air-conditioning panel 21 or a large amount of condensation water has condensed, which will affect the operation effect of the radiation air-conditioning panel 21. The radiation air-conditioning panel solenoid valve 51 is closed, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened to close the radiation air-conditioning panel 21 and enable the convection air-conditioning to provide cooling or heat to the indoor space.

[0131] If the frequency of compressor 82 is less than f1, the controller determines that compressor 82 is operating in the low-capacity section. At this time, the load required by the indoor space is relatively small. First, the radiation air-conditioning panel solenoid valve 51 is opened, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened to enable the radiation air-conditioning panel 21 and the indoor heat exchanger 22 to operate. During this process, if it is detected again that the frequency of compressor 82 is less than f1 and the evaporation temperature is not less than the dew point compensation temperature, the radiation air-conditioning panel solenoid valve 51 is opened, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are closed. Only the radiation air-conditioning panel 21 is opened. The radiation air-conditioning system 100 only performs radiation heat exchange with the indoor environment, which reduces the discomfort caused by the cold air flow blowing through the human body and can effectively improve the comfort when using air conditioning.

[0132] In some embodiments, when the opening time of the radiation air conditioning panel solenoid valve 51 reaches t3, it is calculated whether the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is not less than the preset difference X2. If so, it is judged that the indoor ambient temperature deviates from the target indoor ambient temperature by a large margin and needs to output a larger amount of cooling. The radiation air conditioning panel solenoid valve 51 is opened, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened to enable the convection air conditioning to operate and output a larger amount of cooling or heat to meet the indoor load.

[0133] In other embodiments, when the opening time of the radiation air conditioning panel solenoid valve 51 reaches t3, the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is calculated, and the change rate a when the difference ΔT = 0 is calculated, and it is determined whether a is not less than the preset temperature difference change rate a2. If so, it is determined that the indoor ambient temperature is difficult to be stably at the target indoor ambient temperature point, and a larger cooling capacity needs to be output. The radiation air conditioning panel solenoid valve 51 is opened, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened to enable the convection air conditioning to operate and provide more cooling and heat to the indoor space.

[0134] In other embodiments, when the opening time of the radiation air-conditioning panel solenoid valve 51 reaches t3, the relationship between the evaporation temperature and the dew point compensation temperature is judged. When the evaporation temperature is lower than the dew point compensation temperature, the controller judges that condensation water is easy to condense on the surface of the radiation air-conditioning panel 21 or a large amount of condensation water has condensed, which will affect the operation effect of the radiation air-conditioning panel 21. The radiation air-conditioning panel solenoid valve 51 is opened, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened to open the radiation air-conditioning panel 21 and enable the convection air-conditioning to provide cooling or heat to the indoor space.

[0135] In other embodiments of the present application, the controller is configured such that if the heat exchanger solenoid valve 52 is opened or closed j times within the operating time t4 of the compressor 82, then within the following operating time t5, the heat exchanger solenoid valve 52 always remains open, and shields other signals sent by the control program regarding the heat exchanger solenoid valve 52, so that the heat exchanger solenoid valve 52 remains constantly open within the operating time t5, and the refrigerant can circulate between the indoor heat exchanger 22 and the outdoor heat exchanger 3 within the time t5.

[0136] It should be noted that the heat exchanger solenoid valve 52 is opened or closed to control the heat exchanger to work or not work.

[0137] On the one hand, since the compressor 82 switches between the high capacity segment, the medium capacity segment and the high capacity segment, the heat exchanger solenoid valve 52 is frequently opened or closed during the operating time t4, which is not conducive to the stable operation of the compressor 82 between a certain capacity segment, and cannot stably output cooling or heat to adjust the temperature and humidity of the indoor environment, affecting the user experience.

[0138] On the other hand, since the heat exchanger solenoid valve 52 is frequently opened or closed during time t4, the cooling or heating capacity provided by the heat exchanger is large. Frequent starting or shutting down of the indoor heat exchanger 22 will cause the load fluctuation of the radiation air-conditioning system 100 to be too large, causing the compressor 82 and the components in the system to need to adapt to the large fluctuation, which will increase the probability of damage to the compressor 82 and have an adverse effect on the operating stability of the radiation air-conditioning system 100.

[0139] In other embodiments of the present application, the controller is configured such that if the radiation air conditioning panel solenoid valve 51 is opened or closed k times within the operating time t6 of the compressor 82, then within the following operating time t7, the radiation air conditioning panel solenoid valve 51 always remains closed and shields other signals sent by the control program regarding the radiation air conditioning panel solenoid valve 51.

[0140] The radiation air conditioning panel solenoid valve 51 can control the start or shut down of the radiation air conditioning panel 21. Since the radiation air conditioning panel 21 does not run when the compressor 82 is in the high capacity segment, and the radiation air conditioning panel 21 runs when the compressor 82 is in the medium capacity segment and the low capacity segment, in order to reduce the number of frequent switching of the compressor 82 between the high capacity segment, the medium capacity segment and the low capacity segment, and to ensure that the cooling or heat output by the radiation air conditioning system 100 can meet the load requirements, when the radiation air conditioning panel solenoid valve 51 is closed, the heat exchanger solenoid valve 52 remains open to enable the convection air conditioning to provide cooling or heat to the indoor space.

[0141] In some embodiments, j is 2 or 3, and k is 2 or 3.

[0142] In the prior art, radiant air conditioning systems include radiant air conditioning and convection air conditioning. To reduce the probability of condensation on radiant air conditioning panels, some radiant air conditioning systems adjust the fresh air volume and dehumidification capacity according to the usage requirements of different seasons, set up main air ducts and bypass air ducts, and use valves to control the opening of different air ducts to reduce condensation on the radiant air conditioning panels. The refrigerant outflow pipes of other air conditioners are divided into different pipe sections, and the valves in the system are opened or closed according to the inlet and outlet temperatures of different pipe sections to achieve regulation of the radiant air conditioning system. Existing radiant air conditioning systems often have relatively complex control steps, and the effect of reducing condensation on radiant air conditioning panels is relatively insignificant, affecting the normal use of the radiant air conditioning system and giving users a poor user experience.

[0143] The radiation air-conditioning system of the present application only needs to open or close the radiation air-conditioning panel expansion valve and the heat exchanger expansion valve, and only needs to receive electrical signals from the pressure sensor, the indoor temperature detection device, and the indoor humidity detection device. The number of sensors required is small, the cost is low, and the adjustment method is simple. The opening and closing of the radiation air-conditioning panel expansion valve and the heat exchanger expansion valve are adjusted according to the capacity segment of the compressor frequency. The condensation risk of the radiation air-conditioning panel is judged according to the capacity segment, so that the radiation air-conditioning system can meet the load requirements and reduce the condensation risk, thereby optimizing the user experience.

[0144] Reference Figure 4 、 Figure 5 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10The present application also provides a radiant air conditioning system 100 having a compressor 82 with dual air intakes and a single air exhaust port.

[0145] According to the radiant air conditioning system 100 of the present application, the number of radiant air conditioning panels 21 is n, where n ≥ 1. The first flow path includes a main inlet pipe of the radiant air conditioning panel. The first flow path is divided into n first flow branches, and the n first flow branches respectively flow through the n radiant air conditioning panels 21. The n radiant air conditioning panels 21 are connected in parallel.

[0146] It should be noted that a corresponding radiation air-conditioning panel solenoid valve 51 is set for all radiation air-conditioning panels 21. The cooling capacity provided by a single radiation air-conditioning panel 21 is relatively small, and there is no need to set a solenoid valve for each radiation air-conditioning panel 21. If a solenoid valve is set for each radiation air-conditioning panel 21, the total cost of the radiation air-conditioning system 100 will be higher.

[0147] The number of indoor heat exchangers 22 is m, where m ≥ 1. The second flow path includes a main input pipe of the indoor heat exchanger. The refrigerant flowing through the middle input pipe of the indoor heat exchanger is divided into m second flow branches. The m second flow branches flow through the m indoor heat exchangers 22 respectively. The m indoor heat exchangers 22 are connected in parallel.

[0148] Each indoor heat exchanger 22 is correspondingly provided with an indoor heat exchanger 22 solenoid valve. When the number of indoor heat exchangers 22 is m, the air-conditioning indoor unit 11 is provided with m heat exchanger solenoid valves 52, including the first heat exchanger solenoid valve 52, the second heat exchanger solenoid valve 52...the mth heat exchanger solenoid valve 52.

[0149] The radiant air conditioning system 100 includes two electronic expansion valves 4: a first electronic expansion valve 41 and a second electronic expansion valve 42. The first electronic expansion valve 41 is connected to the main input pipeline of the radiant air conditioning panel 21, and the second electronic expansion valve 42 is connected to the main input pipeline of the indoor heat exchanger 22. The two electronic expansion valves 4 are each electrically connected to a controller. The controller outputs an electrical signal to adjust the opening of the electronic expansion valves 4, throttling the refrigerant flow through the two electronic expansion valves 4.

[0150] The compressor 82 includes two air intakes and one air exhaust. One of the air intakes is connected to the total output pipeline of the radiation air conditioning panel 21 through an air intake pipe, and the other air intake is connected to the total output pipeline of the indoor heat exchanger 22 through an air intake pipe, so that the refrigerant that has undergone different evaporation processes can be divided into two paths and enter the compressor 82.

[0151] When m=2, the number of the indoor heat exchangers 22 is two, and the number of the heat exchanger solenoid valves 52 is two, namely a first heat exchanger solenoid valve 52 and a second heat exchanger solenoid valve 52 .

[0152] The controller is electrically connected to the radiation air conditioning panel solenoid valve 51 and the heat exchanger solenoid valve 52 respectively. The controller outputs different currents according to a preset program to change the current in the solenoid coil of the solenoid valve to open or close the solenoid valve.

[0153] The controller is configured to: after receiving the power-on signal, close the radiation air conditioning panel solenoid valve 51 and open the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 .

[0154] When the radiant air conditioning panel electromagnetic valve 51 is closed, the refrigerant flowing out of the air conditioning outdoor unit 12 is blocked from entering the radiant air conditioning panel 21, thereby making the radiant air conditioning panel 21 inoperable.

[0155] When the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened, the refrigerant flowing out of the air-conditioning outdoor unit 12 can flow into the first heat exchanger and the second heat exchanger through the pipeline, and release cold or heat to the air flow flowing through the surface of the heat exchanger.

[0156] The controller is configured to calculate the change rate d of the frequency of the compressor 82 during the time t0. If d is not greater than the preset change rate d1, it is determined that the change rate of the frequency of the compressor 82 is low and the compressor 82 is considered to be in a relatively stable operating state.

[0157] The value of time t0 is related to the indoor ambient temperature, the exhaust volume of the compressor 82, the heat exchange area of ​​the indoor heat exchanger 22, the heat exchange area of ​​the outdoor heat exchanger 3, and the radiation cooling capacity of the radiation panel.

[0158] The controller is configured to determine that the compressor 82 is in a stable operation state if d is not greater than the preset change rate d1.

[0159] The evaporation temperature is calculated according to the evaporation inlet section pressure and the evaporation outlet section pressure according to the first logic, and the magnitude relationship between the dew point compensation temperature and the evaporation temperature is determined.

[0160] It should be noted that the dew point compensation temperature is the sum of the dew point temperature and a preset difference ΔT3. ΔT3 ≥ 0. If the evaporation temperature is greater than or equal to the dew point compensation temperature, airflow passing over the surface of the radiant air conditioning panel 21 will not condense, and the indoor humidity conditions will meet the conditions for preventing condensation on the radiant air conditioning panel 21.

[0161] Calculation method of evaporation temperature:

[0162] The radiant air conditioning system 100 includes an indoor temperature detection device and an indoor humidity detection device arranged in the indoor space, which are used to detect the indoor ambient temperature value and the indoor ambient humidity value respectively, and upload the results to the controller.

[0163] The radiant air conditioning system 100 includes a first pressure sensor 61 and a second pressure sensor 62, each used to detect the pressure at both ends of the evaporator. The first and second evaporator pressure sensors 61 and 62 are each electrically connected to a controller, transmitting the evaporator inlet and outlet pressures, respectively, to the controller.

[0164] The first pressure sensor 61 is installed in the pipeline connecting the evaporator and the electronic expansion valve 4 to detect the refrigerant pressure at the evaporator inlet. The refrigerant is throttled and depressurized as it flows through the electronic expansion valve 4. The refrigerant flowing out of the electronic expansion valve 4 then flows into the indoor heat exchanger 22 or the radiant air conditioning panel 21. The first pressure sensor 61 detects the refrigerant pressure entering the evaporator, that is, the refrigerant pressure at the evaporator inlet.

[0165] The second pressure sensor 62 is located on the pipeline connecting the evaporator and the air intake of the compressor 82. It is used to detect the refrigerant pressure at the evaporator outlet pipeline. The refrigerant evaporates within the evaporator and then flows into the air intake of the compressor 82, where it is compressed into high-temperature, high-pressure refrigerant. The second pressure sensor 62 detects the pressure of the refrigerant flowing out of the evaporator, that is, the refrigerant pressure at the evaporator outlet.

[0166] First logic: According to the thermodynamic formula, the evaporation inlet section pressure and the evaporation outlet section pressure are calculated. The evaporation pressure and the evaporation temperature are in a one-to-one correspondence, and the evaporation temperature under the corresponding state can be obtained.

[0167] Calculation method of dew point temperature:

[0168] Radiant air conditioning system 100 includes a humidity detection device installed in the indoor space. In some embodiments, the humidity detection device is a humidity sensor, and in other embodiments, a temperature and humidity integrated sensor. The humidity detection device is electrically connected to a controller, detects the indoor humidity, and transmits the indoor humidity value to the controller.

[0169] The controller calculates the dew point temperature based on the indoor humidity value and thermodynamic formula.

[0170] The controller is configured as follows: if the evaporation temperature is not greater than the dew point compensation temperature, it is determined that the airflow in the indoor environment is prone to condensation when flowing through the surface of the radiation air-conditioning panel 21, and the opening of the first electronic expansion valve 41 is gradually reduced. In the process of gradually reducing the opening of the first electronic expansion valve 41, the relationship between the evaporation temperature and the dew point compensation temperature is calculated. When the evaporation temperature is not less than the dew point compensation temperature, the reduction of the opening of the first electronic expansion valve 41 is stopped. At this time, the opening of the first electronic expansion valve 41 is S1.

[0171] It should be noted that when the opening of the first electronic expansion valve 41 is reduced, on the one hand, the flow rate of the refrigerant flowing into the radiation air-conditioning panel 21 is reduced. When the heat exchange rate of the refrigerant per unit mass does not fluctuate much, the reduction in the flow rate of the refrigerant will cause the refrigerant to evaporate in the radiation air-conditioning. The heat absorbed by the unit mass of the refrigerant increases, thereby causing the temperature of the refrigerant to rise higher, thereby increasing the temperature of the outer surface of the radiation air-conditioning panel 21 and reducing the probability of condensation on the radiation air-conditioning panel 21.

[0172] On the other hand, reducing the opening of the first electronic expansion valve 41 will make the flow cross-sectional area of ​​the first electromagnetic expansion valve smaller, the throttling effect more significant, and the dryness of the refrigerant increases compared with before. The refrigerant with higher dryness flows through the entire radiation air-conditioning panel 21 and enters the overheating state in advance, so that the evaporation temperature of the refrigerant is increased, thereby increasing the outer surface temperature of the radiation air-conditioning panel 21 and reducing the probability of condensation on the radiation air-conditioning panel 21.

[0173] The adjustment opening difference of the first electronic expansion valve 41 is S0, Td is a preset valve adjustment time, and the adjustment rate of the first electronic expansion valve 41 is the ratio of S0 to Td.

[0174] When the radiant air conditioning system 100 operates under rated conditions and the opening of the first electronic expansion valve 41 is adjusted to Sa, the evaporation temperature of the radiant air conditioning panel 21 is equal to the dew point temperature.

[0175] The controller is configured as:

[0176] If the opening S1 of the first electronic expansion valve 41 is not less than the preset opening Sa, the opening of the first electronic expansion valve 41 can be further reduced, the radiation air-conditioning panel solenoid valve 51 is opened, and the heat exchanger solenoid valve 52 is opened, so that the radiation air-conditioning panel 21 and the indoor heat exchanger 22 supply cooling to the indoor room at the same time, and re-enter the cycle, and calculate the change rate d of the compressor 82 frequency within the time t0 again.

[0177] If the opening S1 of the first electronic expansion valve 41 is less than the preset opening Sa, it is judged that there is a high probability that condensation will occur on the radiation air-conditioning panel 21. The radiation air-conditioning panel solenoid valve 51 is closed, and the heat exchanger solenoid valve 52 is opened. The cooling capacity is output through convection air-conditioning, which can effectively reduce the low operating efficiency of the radiation air-conditioning panel 21.

[0178] The compressor 82 includes two cylinders, each cylinder is connected to an air inlet, and therefore, the compressor 82 of the present application can be operated when the radiation air conditioning panel 21 is used alone, or when the indoor heat exchanger 22 is used alone.

[0179] The controller is configured to, when the opening degree of the first electronic expansion valve 41 is S1, calculate the difference between the indoor ambient temperature value and a preset indoor ambient temperature value based on the indoor ambient temperature value uploaded by the indoor temperature detection device, and define this as a first temperature difference. The controller then determines whether the first temperature difference ΔT falls within the target temperature range [ΔT1, ΔT2]. If so, the indoor ambient temperature is considered to be stable. If not, the indoor ambient temperature is considered to be unstable, and the indoor ambient temperature value is continuously detected, and whether the indoor ambient temperature is stable is further determined based on the first temperature difference.

[0180] The controller is configured to: when the indoor ambient temperature falls within the target temperature range [ΔT1, ΔT2], determine the relationship between the evaporation temperature and the dew point compensation temperature at that time;

[0181] If the evaporation temperature is not greater than the dew point compensation temperature, it is judged that the probability of condensation water precipitating on the surface of the radiation air-conditioning panel 21 is high, and the radiation air-conditioning panel solenoid valve 51 is closed and the heat exchanger solenoid valve 52 is opened. During this process, the relationship between the evaporation temperature and the dew point compensation temperature is detected. When the evaporation temperature is greater than the dew point compensation temperature, the radiation air-conditioning panel solenoid valve 51 is opened and the heat exchanger solenoid valve 52 is opened.

[0182] If the evaporation temperature is greater than the dew point compensation temperature, it is determined that the probability of condensation water precipitating on the radiation air conditioning panel 21 is small, and the radiation air conditioning panel solenoid valve 51 is opened, and the heat exchanger solenoid valve 52 is opened to allow the radiation air conditioning panel 21 to radiate heat with the indoor environment. During this process, the relationship between the evaporation temperature and the dew point compensation temperature is detected. When the evaporation temperature is not greater than the dew point compensation temperature, the radiation air conditioning panel solenoid valve 51 is closed, and the heat exchanger solenoid valve 52 is opened to enable the convection air conditioning to output cooling to the indoor environment.

[0183] The controller is configured to: when the compressor 82 continuously operates for a time period t10, based on the indoor ambient temperature value uploaded by the indoor temperature detection device, calculate the difference between the indoor ambient temperature value and the preset indoor ambient temperature value, and define it as a first temperature difference value, and then determine whether the first temperature difference value ΔT falls within the target temperature range [ΔT1, ΔT2]. If the first temperature difference value ΔT falls within the target temperature range, it is determined that the indoor ambient temperature is relatively stable at this time.

[0184] The controller is configured to: if the first temperature difference ΔT falls within the target temperature range [ΔT1, ΔT2], determine the magnitude relationship between the operating frequency of the compressor 82 and the preset compressor 82 frequency f2 and the preset compressor 82 frequency f1, where f2>f1.

[0185] The controller is configured such that if the frequency of the compressor 82 is not less than the preset frequency f2, the controller determines that the compressor 82 is operating in the high-capacity section. The frequency of the compressor 82 is higher to meet the higher load requirements indoors. At this time, the compressor 82 is operating in the high-capacity section, closing the radiation air conditioning panel solenoid valve 51 and opening the heat exchanger solenoid valve 52 to allow the indoor heat exchanger 22 to release cold air to the room, so that the convection air conditioner can output a large amount of cooling load.

[0186] The controller is configured as follows: if the frequency of the compressor 82 is less than f2 and the frequency of the compressor 82 is greater than or equal to f1, the compressor 82 operates in the medium capacity section, the radiation air conditioning panel solenoid valve 51 is opened, and the heat exchanger solenoid valve 52 is opened, so that the radiation air conditioning panel 21 and the indoor heat exchanger 22 simultaneously deliver cold air to the room.

[0187] At this time, the indoor load is still at a high state, but it does not need to rely entirely on strong convection of convection air conditioning to meet the load. After the radiation air conditioning panel solenoid valve 51 is opened, the refrigerant flows into the radiation air conditioning panel 21, and the radiation air conditioning panel 21 performs radiation heat exchange with the indoor environment, which can reduce the load of the convection air conditioning and reduce the proportion of convection heat transfer in the total heat transfer, so that the user feels more comfortable.

[0188] In some embodiments, when the opening time of the radiation air conditioning panel solenoid valve 51 reaches t2, it is calculated whether the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is not less than the preset difference X1. If so, it is judged that the indoor ambient temperature deviates from the target indoor ambient temperature by a large margin and a larger cooling capacity needs to be output. The radiation air conditioning panel solenoid valve 51 is closed, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened. The frequency of the compressor 82 is increased to the high capacity segment to make the convection air conditioner run at high load to meet the indoor load.

[0189] In other embodiments, when the opening time of the radiation air conditioning panel solenoid valve 51 reaches t2, the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is calculated, and the change rate a when the difference ΔT = 0 is calculated, and it is determined whether a is not less than the preset temperature difference change rate a1. If so, it is determined that the indoor ambient temperature is difficult to be stably at the target indoor ambient temperature point, and a larger cooling capacity needs to be output. The radiation air conditioning panel solenoid valve 51 is closed, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened, and the frequency of the compressor 82 is increased to the high capacity segment to make the convection air conditioner run at high load to meet the indoor load.

[0190] In other embodiments, when the opening time of the radiation air-conditioning panel solenoid valve 51 reaches t2, the relationship between the evaporation temperature and the dew point compensation temperature is judged. When the evaporation temperature is lower than the dew point compensation temperature, the controller judges that condensation water is easy to condense on the surface of the radiation air-conditioning panel 21 or a large amount of condensation water has condensed, which will affect the operation effect of the radiation air-conditioning panel 21. The radiation air-conditioning panel solenoid valve 51 is closed, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened to close the radiation air-conditioning panel 21 and enable the convection air-conditioning to provide cooling or heat to the indoor space.

[0191] If the frequency of the compressor 82 is less than the preset frequency f1, that is, the frequency of the compressor 82 reaches the lower limit of the preset frequency f1, it is judged that the load required by the indoor environment at this time is relatively small. At this time, the compressor 82 operates in the low-capacity segment, the radiation air-conditioning panel solenoid valve 51 is opened, and the heat exchanger solenoid valve 52 is closed. Only the radiation air-conditioning panel 21 is running to meet the indoor load requirements.

[0192] It should be noted that the compressor 82 of the present application has two cylinders. When the radiation air conditioning panel solenoid valve 51 is opened and the heat exchanger solenoid valve 52 is closed, only one cylinder of the compressor 82 works, which can meet the load conditions for the radiation air conditioning to operate alone.

[0193] Since the load corresponding to the radiant air conditioning panel 21 is relatively low, when the radiant air conditioning system 100 is configured with a compressor 82 having a single air intake and a single air exhaust, it is not possible to directly switch from turning on only the indoor heat exchanger 22 to turning on only the radiant air conditioning panel 21. The radiant air conditioning system 100 of the present application is configured with a compressor 82 having two air intakes and one air exhaust. When it is detected that the compressor 82 is operating in a low-capacity segment, it is possible to directly switch from turning on only the indoor heat exchanger 22 to turning on the radiant air conditioning panel 21. One cylinder of the compressor 82 is operating while the other cylinder is not operating, which does not affect the stability of the operation of the compressor 82 and reduces the probability of damage to the compressor 82. It can also switch quickly, and the control logic is simpler.

[0194] In some embodiments, when the opening time of the radiation air conditioning panel solenoid valve 51 reaches t3, it is calculated whether the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is not less than the preset difference X2. If so, it is judged that the indoor ambient temperature deviates from the target indoor ambient temperature by a large margin and needs to output a larger amount of cooling. The radiation air conditioning panel solenoid valve 51 is opened, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened to enable the convection air conditioning to operate and output a larger amount of cooling or heat to meet the indoor load.

[0195] In other embodiments, when the opening time of the radiation air conditioning panel solenoid valve 51 reaches t3, the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is calculated, and the change rate a when the difference ΔT = 0 is calculated, and it is determined whether a is not less than the preset temperature difference change rate a2. If so, it is determined that the indoor ambient temperature is difficult to be stably at the target indoor ambient temperature point, and a larger cooling capacity needs to be output. The radiation air conditioning panel solenoid valve 51 is opened, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened to enable the convection air conditioning to operate and provide more cooling and heat to the indoor space.

[0196] In other embodiments, when the opening time of the radiation air-conditioning panel solenoid valve 51 reaches t3, the relationship between the evaporation temperature and the dew point compensation temperature is judged. When the evaporation temperature is lower than the dew point compensation temperature, the controller judges that condensation water is easy to condense on the surface of the radiation air-conditioning panel 21 or a large amount of condensation water has condensed, which will affect the operation effect of the radiation air-conditioning panel 21. The radiation air-conditioning panel solenoid valve 51 is opened, and the first heat exchanger solenoid valve 52 and the second heat exchanger solenoid valve 52 are opened to open the radiation air-conditioning panel 21 and enable the convection air-conditioning to provide cooling or heat to the indoor space.

[0197] In other embodiments of the present application, the controller is configured such that if the heat exchanger solenoid valve 52 is opened or closed j times within the operating time t4 of the compressor 82, then within the following operating time t5, the heat exchanger solenoid valve 52 always remains open, and shields other signals sent by the control program regarding the heat exchanger solenoid valve 52, so that the heat exchanger solenoid valve 52 remains constantly open within the operating time t5, and the refrigerant can circulate between the indoor heat exchanger 22 and the outdoor heat exchanger 3 within the time t5.

[0198] It should be noted that the heat exchanger solenoid valve 52 is opened or closed to control the heat exchanger to work or not work.

[0199] On the one hand, since the compressor 82 switches between the high capacity segment, the medium capacity segment and the high capacity segment, the heat exchanger solenoid valve 52 is frequently opened or closed during the operating time t4, which is not conducive to the stable operation of the compressor 82 between a certain capacity segment, and cannot stably output cooling or heat to adjust the temperature and humidity of the indoor environment, affecting the user experience.

[0200] On the other hand, since the heat exchanger solenoid valve 52 is frequently opened or closed during time t4, the cooling or heating capacity provided by the heat exchanger is large. Frequent starting or shutting down of the indoor heat exchanger 22 will cause the load fluctuation of the radiation air-conditioning system 100 to be too large, causing the compressor 82 and the components in the system to need to adapt to the large fluctuation, which will increase the probability of damage to the compressor 82 and have an adverse effect on the operating stability of the radiation air-conditioning system 100.

[0201] In other embodiments of the present application, the controller is configured such that if the radiation air conditioning panel solenoid valve 51 is opened or closed k times within the operating time t6 of the compressor 82, then within the following operating time t7, the radiation air conditioning panel solenoid valve 51 always remains closed and shields other signals sent by the control program regarding the radiation air conditioning panel solenoid valve 51.

[0202] The radiation air conditioning panel solenoid valve 51 can control the start or shut down of the radiation air conditioning panel 21. Since the radiation air conditioning panel 21 does not run when the compressor 82 is in the high capacity segment, and the radiation air conditioning panel 21 runs when the compressor 82 is in the medium capacity segment and the low capacity segment, in order to reduce the number of frequent switching of the compressor 82 between the high capacity segment, the medium capacity segment and the low capacity segment, and to ensure that the cooling or heat output by the radiation air conditioning system 100 can meet the load requirements, when the radiation air conditioning panel solenoid valve 51 is closed, the heat exchanger solenoid valve 52 remains open to enable the convection air conditioning to provide cooling or heat to the indoor space.

[0203] In some embodiments, j is 2 or 3, and k is 2 or 3.

[0204] In the prior art, radiant air conditioning systems include radiant air conditioning and convection air conditioning. To reduce the probability of condensation on radiant air conditioning panels, some radiant air conditioning systems adjust the fresh air volume and dehumidification capacity according to the usage requirements of different seasons, set up main air ducts and bypass air ducts, and use valves to control the opening of different air ducts to reduce condensation on the radiant air conditioning panels. The refrigerant outflow pipes of other air conditioners are divided into different pipe sections, and the valves in the system are opened or closed according to the inlet and outlet temperatures of different pipe sections to achieve regulation of the radiant air conditioning system. Existing radiant air conditioning systems often have relatively complex control steps, and the effect of reducing condensation on radiant air conditioning panels is relatively insignificant, affecting the normal use of the radiant air conditioning system and giving users a poor user experience.

[0205] The radiation air conditioning system of the present application only needs to adjust the opening of the first electronic expansion valve, and open or close the radiation air conditioning panel expansion valve and the heat exchanger expansion valve. It only needs to receive electrical signals from the pressure sensor, the indoor temperature detection device, and the indoor humidity detection device. The number of sensors required is small and the cost is low. The evaporation temperature of the radiation air conditioning panel is increased by controlling the first electronic expansion valve. The adjustment method is simple. The opening and closing of the radiation air conditioning panel expansion valve and the heat exchanger expansion valve are adjusted by the capacity segment of the compressor frequency. The adjustment method is simple. The condensation risk of the radiation air conditioning panel is judged according to the capacity segment, so that the radiation air conditioning system meets the load requirements, reduces the condensation risk, and optimizes the user experience. In addition, the compressor of the radiation air conditioning system of the present application has two air intakes and one exhaust port, and has two cylinders. It can be directly switched to the low capacity segment for operation, further simplifying the control method.

[0206] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A radiant air conditioning system, characterized in that: include: A radiant air conditioning panel is provided indoors and has at least one; An indoor heat exchanger is provided indoors and has at least one; compressor; an outdoor heat exchanger, which is located in an outdoor space; an electronic expansion valve, the indoor heat exchanger and the radiant air conditioning panel are connected in parallel to form a first parallel pipeline, and the electronic expansion valve is connected between the first parallel pipeline and the outdoor heat exchanger; a radiant air conditioning panel solenoid valve, comprising one solenoid valve, which is provided in the first parallel pipeline and connected to the main input pipe of the radiant air conditioning panel; Heat exchanger solenoid valves, the number of which is the same as the number of the indoor heat exchangers, are provided in the first parallel pipeline and connected to the branch input pipe of each heat exchanger; An indoor temperature detection device, which is installed in the indoor space; a pressure detection device for measuring the pressure of the evaporation inlet section and the pressure of the evaporation outlet section of the first parallel pipeline; The controller is configured as: After receiving the power-on signal, close the radiation air conditioning panel solenoid valve and open the heat exchanger solenoid valve; Based on the indoor ambient temperature value uploaded by the indoor temperature detection device, calculating the difference between the indoor ambient temperature value and the preset indoor ambient temperature value, and defining it as a first temperature difference; When the first temperature difference ΔT falls within the target temperature range [ΔT1, ΔT2], the evaporation temperature is calculated based on the evaporation inlet section pressure, the evaporation outlet section pressure and the thermodynamic formula; When the evaporation temperature is not less than the dew point compensation temperature, wherein the dew point compensation temperature is the sum of the dew point temperature and the preset difference ΔT3, ΔT3 ≥ 0; If the compressor frequency is not less than the second preset compressor frequency f2, the radiant air conditioning panel solenoid valve is closed and the heat exchanger solenoid valve is opened; If the compressor frequency is less than f2 and the compressor frequency is greater than or equal to the first preset compressor frequency f1, the radiant air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is opened; If the compressor frequency is less than f1, the radiation air conditioning panel solenoid valve and the heat exchanger solenoid valve are opened first. If the compressor frequency is detected to be less than f1 again, the radiation air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is closed. Among them, f2>f1.

2. The radiant air conditioning system according to claim 1, characterized in that If the compressor frequency is less than f2 and the compressor frequency is greater than or equal to f1, open the radiation air-conditioning panel solenoid valve and open the heat exchanger solenoid valve. When the opening time of the radiation air-conditioning panel and the heat exchanger solenoid valve reaches t2, if the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is not less than the preset difference X1, close the radiation air-conditioning panel solenoid valve and open the heat exchanger solenoid valve.

3. The radiant air conditioning system according to claim 1 or 2, characterized in that: If the compressor frequency is less than f2 and the compressor frequency is greater than or equal to f1, open the radiation air-conditioning panel solenoid valve and the heat exchanger solenoid valve. When the opening time of the radiation air-conditioning panel and the heat exchanger solenoid valve reaches t2; the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature, if the change rate a when the difference ΔT=0 is not less than the preset temperature difference change rate a1, close the radiation air-conditioning panel solenoid valve and open the heat exchanger solenoid valve.

4. The radiant air conditioning system according to claim 1 or 2, characterized in that: If the compressor frequency is less than f2 and the compressor frequency is greater than or equal to f1, open the radiation air conditioning panel solenoid valve and the heat exchanger solenoid valve. When the opening time of the radiation air conditioning panel and the heat exchanger solenoid valve reaches t2, when the evaporation temperature is lower than the dew point compensation temperature, close the radiation air conditioning panel solenoid valve and open the heat exchanger solenoid valve.

5. The radiant air conditioning system according to claim 1, wherein: If the compressor frequency is less than f1, and the compressor frequency is detected to be less than f1 again during operation, and the evaporation temperature is not less than the dew point compensation temperature, open the radiation air conditioning panel solenoid valve and close the heat exchanger solenoid valve. When the opening time of the radiation air conditioning panel solenoid valve reaches t3, the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature is not less than the preset difference X2, the radiation air conditioning panel solenoid valve is opened, and the heat exchanger solenoid valve is opened.

6. The radiant air conditioning system according to claim 1, wherein: If the compressor frequency is less than f1, and the compressor frequency is detected to be less than f1 again during operation, and the evaporating temperature is not less than the dew point compensation temperature, the radiation air-conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is closed. When the opening time of the radiation air-conditioning panel solenoid valve reaches t3, the difference ΔT between the indoor ambient temperature and the target indoor ambient temperature, and the change rate a when the difference ΔT=0 is not less than the preset temperature difference change rate a2, the radiation air-conditioning panel solenoid valve is opened, and the heat exchanger solenoid valve is opened.

7. The radiant air conditioning system according to claim 1, wherein: If the compressor frequency is less than f1, and the compressor frequency is detected to be less than f1 again during operation, and the evaporation temperature is not less than the dew point compensation temperature, open the radiation air conditioning panel solenoid valve and close the heat exchanger solenoid valve. When the opening time of the radiation air conditioning panel solenoid valve reaches t3, when the evaporation temperature is lower than the dew point compensation temperature, the radiation air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is opened.

8. A radiant air conditioning system, characterized in that: include: A radiant air conditioning panel is provided indoors and has at least one; An indoor heat exchanger is provided indoors and has at least one; compressor; an outdoor heat exchanger, which is located in an outdoor space; an electronic expansion valve, the indoor heat exchanger and the radiant air conditioning panel are connected in parallel to form a first parallel pipeline, and the electronic expansion valve is connected between the first parallel pipeline and the outdoor heat exchanger; a radiant air conditioning panel solenoid valve, comprising one solenoid valve, which is provided in the first parallel pipeline and connected to the main input pipe of the radiant air conditioning panel; Heat exchanger solenoid valves, the number of which is the same as the number of the indoor heat exchangers, are provided in the first parallel pipeline and connected to the branch input pipe of each heat exchanger; An indoor temperature detection device, which is installed in the indoor space; a pressure detection device for measuring the pressure of the evaporation inlet section and the pressure of the evaporation outlet section of the first parallel pipeline; The controller is configured as: After receiving the power-on signal, close the radiation air conditioning panel solenoid valve and open the heat exchanger solenoid valve; Based on the indoor ambient temperature value uploaded by the indoor temperature detection device, calculating the difference between the indoor ambient temperature value and the preset indoor ambient temperature value, and defining it as a first temperature difference; When the first temperature difference ΔT falls within the target temperature range [ΔT1, ΔT2], the evaporation temperature is calculated based on the evaporation inlet section pressure, the evaporation outlet section pressure and the thermodynamic formula; When the evaporating temperature is not less than the dew point compensation temperature, where the dew point compensation temperature is the sum of the dew point temperature and the preset difference ΔT3, ΔT3 ≥ 0; the compressor is divided into high capacity segment, medium capacity segment and low capacity segment according to the frequency of the compressor, and the compressor switches between different capacity segments to meet the indoor load demand; When the compressor is running in the high capacity segment, the radiation air conditioning panel solenoid valve is closed and the heat exchanger solenoid valve is opened; when the compressor is running in the medium capacity segment, the radiation air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is opened; when the compressor is running in the low capacity segment and the compressor frequency is detected in the low capacity segment for multiple times, the radiation air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is closed; If the heat exchanger solenoid valve is opened or closed j times during the compressor operation time t4, then during the following operation time t5, the heat exchanger solenoid valve is always opened and the signals sent by the control program of other heat exchanger solenoid valves are shielded.

9. The radiant air conditioning system according to claim 8, wherein: If the radiation air conditioning panel solenoid valve is opened or closed k times within the compressor operation time t6, then within the next operation time t7, the radiation air conditioning panel solenoid valve is closed and other signals sent by the control program of the radiation air conditioning panel solenoid valve are shielded.

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