Radiation air conditioning system

Abstract

The invention provides a radiation air conditioning system. The radiation air-conditioning system comprises a radiation air-conditioning plate, an indoor heat exchanger, a compressor, an outdoor heat exchanger and an indoor temperature detection device, and the controller is configured to close a radiation air-conditioning plate electromagnetic valve and open a heat exchanger electromagnetic valve after a starting-up signal is obtained; if the change rate d of the compressor frequency within the time t0 is not larger than the preset change rate d1, when the evaporation temperature is smaller than the dew point compensation temperature, the opening degree of the first electronic expansion valve is gradually reduced till the evaporation temperature is not smaller than the dew point compensation temperature, and the opening degree of the first electronic expansion valve is S1 at the moment; if S1 is not smaller than the preset opening degree Sa, a radiation air conditioner plate electromagnetic valve is opened, a heat exchanger electromagnetic valve is opened, and circulation is carried out again; if S1 is smaller than the preset opening degree Sa, a radiation air conditioner plate electromagnetic valve is closed, and a heat exchanger electromagnetic valve is opened; and if the continuous operation time of the compressor is t10 and the first temperature difference value delta T belongs to the target temperature interval [delta T1, delta T2], the electromagnetic valve is opened and closed according to the capacity section where the frequency of the compressor is located.

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 air conditioning panels, which radiate heat to indoor spaces. Radiant air conditioning panels provide cooling or heating to human bodies, indoor objects, and maintenance structures through radiant heat exchange.

[0005] Convection air conditioners change the indoor temperature and humidity by blowing out cold / hot air, such as ducted air conditioners. Convection air conditioners include an indoor fan and an indoor heat exchanger. The indoor fan drives the airflow through the indoor heat exchanger. The airflow absorbs the heat or cold released by the indoor heat exchanger and blows into the indoor space to perform convection heat exchange on the surface of the human body or the surface of objects in the indoor space.

[0006] Since radiation air conditioning uses radiation air conditioning panels to perform radiation heat exchange instead of blowing cold or hot air into the indoor environment, people will feel more comfortable. However, the load that radiation air conditioning panels can carry is relatively small. During the use of radiation air conditioning, convection air conditioning is often required to meet different load requirements.

[0007] Since the distance between the radiation air conditioning panel and the human body is relatively close, in order to reduce the user's discomfort, when the radiation air conditioning system is in cooling mode, the temperature of the radiation 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 radiation air conditioning panel per unit area. If the load demand is to be met, the area of ​​the radiation air conditioning panel can only be expanded.

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

[0009] In the prior art, in order to reduce the probability of condensation on the radiation air conditioning panels, some radiation air conditioning systems adjust the fresh air volume and dehumidification volume according to the usage requirements of different seasons, set the main air duct and the bypass air duct, and use valves to control the opening of different air ducts to reduce condensation on the radiation 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 the regulation of the radiation air conditioning system. Existing radiation air conditioning systems often have relatively complex control steps, and the effect of reducing condensation on the radiation air conditioning panels is not obvious, which affects the normal use of the radiation air conditioning system and brings a bad 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: a radiant air conditioning panel, arranged indoors, having at least one;

[0013] An indoor heat exchanger is provided indoors and has at least one;

[0014] A compressor having two cylinders, each cylinder being provided with an air intake port;

[0015] An outdoor heat exchanger is arranged in an outdoor space;

[0016] A first parallel pipeline, the indoor heat exchanger and the radiation air conditioning panel are connected in parallel to form a first parallel pipeline, the first parallel pipeline includes a first total input pipeline for inputting refrigerant to the radiation air conditioning panel, and a second total input pipeline for inputting refrigerant to the indoor heat exchanger;

[0017] A first electronic expansion valve connected to the first main input pipeline;

[0018] A second electronic expansion valve is connected to the second main input pipeline;

[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 indoor heat exchanger;

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

[0021] A pressure detection device, used to measure the evaporation inlet section pressure and the evaporation outlet section pressure of the first parallel pipeline;

[0022] The controller is configured as:

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

[0024] If the change rate d of the compressor frequency within the time t0 is not greater than the preset change rate d1, the evaporation temperature is calculated according to the evaporation inlet section pressure and the evaporation outlet section pressure according to the first logic,

[0025] When the evaporation temperature is lower than the dew point compensation temperature, the opening of the first electronic expansion valve is gradually reduced until the evaporation temperature is not lower than the dew point compensation temperature, then the opening of the first electronic expansion valve is stopped from being reduced, and at this time the opening of the first electronic expansion valve is S1;

[0026] If the opening degree S1 of the first electronic expansion valve is not less than the preset opening degree Sa, the electromagnetic valve of the radiation air conditioning panel is opened, the electromagnetic valve of the heat exchanger is opened, and the cycle is re-entered;

[0027] If the opening degree S1 of the first electronic expansion valve is less than the preset opening degree Sa, the electromagnetic valve of the radiation air conditioning panel is closed and the electromagnetic valve of the heat exchanger is opened;

[0028] If the compressor runs continuously for time t10, the difference between the indoor ambient temperature and the preset indoor ambient temperature is calculated and defined as the first temperature difference. When the first temperature difference ΔT belongs to the target temperature interval [ΔT1, ΔT2],

[0029] If the compressor frequency is not less than the preset compressor frequency f2, the radiation air conditioning panel solenoid valve is closed and the heat exchanger solenoid valve is opened;

[0030] 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;

[0031] If the compressor frequency is less than f1, the radiation air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is closed;

[0032] Among them, f2>f1.

[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, 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] In some embodiments of the present application, if the compressor frequency is less than f1 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 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.

[0039] In some embodiments of the present application, if the compressor frequency is less than f1 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 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.

[0041] In some embodiments of the present application, if the compressor frequency is less than f1 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;

[0042] When the opening time of the radiation air conditioning panel solenoid valve reaches t3, when the evaporation temperature is less than the dew point compensation temperature, the radiation air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is opened.

[0043] The radiant air conditioning system according to the present application comprises: a radiant air conditioning panel, arranged indoors, having at least one;

[0044] An indoor heat exchanger is provided indoors and has at least one;

[0045] A compressor having two cylinders, each cylinder being provided with an air intake port;

[0046] An outdoor heat exchanger is arranged in an outdoor space;

[0047] A first parallel pipeline, wherein the indoor heat exchanger and the radiation air conditioning panel are connected in parallel to form a first parallel pipeline, the first parallel pipeline comprising a first total input pipeline for inputting refrigerant to the radiation air conditioning panel, and a second total input pipeline for inputting refrigerant to the indoor heat exchanger;

[0048] A first electronic expansion valve connected to the first main input pipeline;

[0049] A second electronic expansion valve is connected to the second main input pipeline;

[0050] 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;

[0051] An indoor temperature detection device, which is arranged in the indoor space;

[0052] A pressure detection device, used to measure the evaporation inlet section pressure and the evaporation outlet section pressure of the first parallel pipeline;

[0053] The controller is configured as:

[0054] After receiving the start-up signal, close the radiation air conditioning panel solenoid valve and open the heat exchanger solenoid valve;

[0055] If the change rate d of the compressor frequency within the time t0 is not greater than the preset change rate d1, the evaporation temperature is calculated according to the evaporation inlet section pressure and the evaporation outlet section pressure according to the first logic,

[0056] When the evaporation temperature is lower than the dew point compensation temperature, the opening of the first electronic expansion valve is gradually reduced until the evaporation temperature is not lower than the dew point compensation temperature, then the opening of the first electronic expansion valve is stopped from being reduced, and at this time the opening of the first electronic expansion valve is S1;

[0057] If the opening degree S1 of the first electronic expansion valve is not less than the preset opening degree Sa, the electromagnetic valve of the radiation air conditioning panel is opened, the electromagnetic valve of the heat exchanger is opened, and the cycle is re-entered;

[0058] If the opening degree S1 of the first electronic expansion valve is less than the preset opening degree Sa, the electromagnetic valve of the radiation air conditioning panel is closed and the electromagnetic valve of the heat exchanger is opened;

[0059] If the compressor runs continuously for a period of time t10, the difference between the indoor ambient temperature and the preset indoor ambient temperature is calculated and defined as the first temperature difference. If the first temperature difference ΔT belongs to the target temperature interval [ΔT1, ΔT2],

[0060] The compressor frequency is divided into high capacity segment, medium capacity segment and low capacity segment, and the compressor switches between different capacity segments to meet the indoor load demand;

[0061] 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 energy section and the compressor frequency is detected to be 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;

[0062] 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 of other heat exchanger solenoid valves.

[0063] 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.

[0064] This application has at least the following positive effects:

[0065] The present invention proposes a radiation air conditioning system. The radiation air conditioning system includes a radiation air conditioning panel, an indoor heat exchanger, a compressor, an outdoor heat exchanger and an indoor temperature detection device, and the controller is configured to: after obtaining a start-up signal, close the radiation air conditioning panel solenoid valve and open the heat exchanger solenoid valve; if the change rate d of the compressor frequency within the time t0 is not greater than the preset change rate d1, when the evaporation temperature is less than the dew point compensation temperature, gradually reduce the opening of the first electronic expansion valve until the evaporation temperature is not less than the dew point compensation temperature, at which time the opening of the first electronic expansion valve is S1; if S1 is not less than the preset opening Sa, open the radiation air conditioning panel solenoid valve, open the heat exchanger solenoid valve, and re-enter the cycle; if S1 is less than the preset opening Sa, close the radiation air conditioning panel solenoid valve and open the heat exchanger solenoid valve; if the compressor continuously runs for time t10, the first temperature difference ΔT belongs to the target temperature interval [ΔT1, ΔT2], and open and close the solenoid valve according to the capacity segment where the compressor frequency is located. 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, which can be directly switched to the low capacity segment for operation, further simplifying the control method. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0067] Figure 1is a system schematic diagram of a radiant air conditioning system according to an embodiment of the present application;

[0068] 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;

[0069] Figure 3 is a control flow chart of a radiant air conditioning system according to an embodiment of the present application;

[0070] Figure 4 is a control flow chart of a compressor of a radiant air conditioning system according to an embodiment of the present application when it is operating in a medium capacity segment;

[0071] Figure 5 is another control flow chart of the compressor of the radiant air conditioning system according to an embodiment of the present application when it is operating in the medium capacity range;

[0072] Figure 6 is another control flow chart of the compressor of the radiant air conditioning system according to an embodiment of the present application when it is operating in the medium capacity range;

[0073] Figure 7 is a system schematic diagram of a radiant air conditioning system according to another embodiment of the present application;

[0074] 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;

[0075] Fig. 9 is a partial control flow chart of a radiant air conditioning system according to another embodiment of the present application;

[0076] Fig.10 is a partial control flow chart of a radiant air conditioning system according to another embodiment of the present application;

[0077] In the above figures: 100, radiation air conditioning system; 11, air conditioning indoor unit; 12, air conditioning outdoor unit; 21, radiation 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, radiation air conditioning panel solenoid valve; 52, heat exchanger solenoid valve; 61, first pressure sensor; 62, second pressure sensor; 7, first parallel pipeline; 71, first total input pipeline; 72, second total input pipeline; 81, four-way valve; 82, compressor; 83, oil separator; 84, oil separator valve; 85, gas-liquid separator. DETAILED DESCRIPTION

[0078] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0079] 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 orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0080] The terms "first", "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, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0081] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the following, reference will be made to the Figure 1-10 The embodiments of the present application are described in detail.

[0083] The radiant air conditioning system 100 includes an air conditioning indoor unit 11 and an air conditioning outdoor unit 12 .

[0084] The air conditioner indoor unit 11 includes a radiation air conditioning panel 21, an indoor heat exchanger 22, a radiation air conditioning panel solenoid valve 51 for controlling the refrigerant flow of the radiation air conditioning panel 21, and a heat exchanger solenoid valve 52 for controlling the flow of the indoor heat exchanger 22. The number of the radiation air conditioning panel 21 can be one or more, and the radiation air conditioning panel 21 is only equipped with one radiation air conditioning panel solenoid valve 51, which is arranged on the total inlet pipe of one or more radiation air conditioning panels 21, that is, all the radiation air conditioning panels 21 are equipped with one radiation air conditioning panel solenoid valve 51.

[0085] The air conditioning outdoor 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 radiation air conditioning panel 21 and the indoor heat exchanger 22 are connected in parallel, and the air conditioning indoor unit 11 and the air conditioning outdoor unit 12 are connected in series, so that the radiation air conditioning panel 21 and the indoor heat exchanger 22 share a compressor 82, a four-way valve 81 and an electronic expansion valve 4. The number of indoor heat exchangers 22 can be set according to the load.

[0086] It should be noted that the radiation air conditioning system 100 includes radiation air conditioning and convection air conditioning, the radiation air conditioning includes a radiation air conditioning panel 21, the convection air conditioning includes an indoor fan and an indoor heat exchanger 22, and the outdoor side of the radiation air conditioning and the convection air conditioning is an 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.

[0087] The radiation air conditioning panel 21 is connected in parallel with the indoor heat exchanger 22, and a circulation is formed between the air conditioning indoor unit 11 and the air conditioning outdoor unit 12. The radiation air conditioning panel and the indoor heat exchanger are located in the first parallel pipeline 7, and the first parallel pipeline 7 is arranged inside the air conditioning indoor unit. The output end of the first parallel pipeline 7 is connected to the air conditioning outdoor unit through the first output pipeline, and the input end of the first parallel pipeline 7 is connected to the air conditioning outdoor unit through the first input pipeline.

[0088] 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.

[0089] The radiant air conditioning system 100 performs a refrigeration cycle or a heating cycle through the compressor 82, the condenser, the electronic expansion valve 4 and the evaporator. The refrigeration cycle and the heating cycle include a compression process, a condensation process, an expansion process and an evaporation process, and provide cold or heat to the indoor space through the heat absorption and heat release process of the refrigerant to achieve temperature regulation of the indoor space.

[0090] The compressor 82 compresses the refrigerant gas into a high temperature and high pressure state and discharges the compressed refrigerant gas, which flows into the condenser. The condenser condenses the compressed high temperature and high pressure gaseous refrigerant into liquid refrigerant, and heat is released to the surrounding environment through the condensation process.

[0091] The liquid refrigerant flowing out of the condenser enters the electronic expansion valve 4, and the electronic expansion valve 4 expands the high-temperature and 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. When the liquid refrigerant flows through the evaporator, it absorbs heat and evaporates into a low-temperature and low-pressure refrigerant gas. The refrigerant gas in a low-temperature and low-pressure state returns to the compressor 82. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0092] When the radiation air conditioning system 100 is in cooling mode, the refrigerant in the indoor heat exchanger 22 and the radiation panel undergoes an evaporation process, and the refrigerant in the outdoor heat exchanger 3 undergoes a condensation process. At this time, the indoor heat exchanger 22 and the radiation air conditioning panel 21 operate as evaporators, and the outdoor heat exchanger 3 operates as a condenser.

[0093] When the radiation air conditioning system 100 is in the heating state, the refrigerant in the indoor heat exchanger 22 and the radiation panel undergoes a condensation process, and the refrigerant in the outdoor heat exchanger 3 undergoes an evaporation process. At this time, the indoor heat exchanger 22 and the radiation air conditioning panel 21 operate as condensers, and the outdoor heat exchanger 3 operates as an evaporator.

[0094] 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.

[0095] 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 .

[0096] The radiant air conditioning system 100 includes a controller for controlling the operation of various components of the radiant air conditioning system 100 so that the components connected to the controller can realize various predetermined functions of the radiant air conditioning system 100 .

[0097] The controller refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct the air conditioner to execute the control instruction. For example, in response to receiving a power-on or power-off instruction issued by the user, the controller can perform an operation related to the object selected by the power-on or power-off instruction.

[0098] The embodiment of the present application also provides a hardware structure diagram of a controller, the controller includes a processor, and optionally, also includes a memory and a communication interface connected to the processor. The processor, the memory and the communication interface are connected via a bus.

[0099] The processor may be a central processing unit (CPU), a general-purpose processor network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller 8, a programmable logic device (PLD), or any combination thereof. The processor may also be any other device having a processing function, such as a circuit, a device, or a software module. The processor may also include multiple CPUs, and the processor may be a single-CPU processor or a multi-CPU processor. The processor here may refer to one or more devices, circuits, or processing cores for processing data (such as computer program instructions).

[0100] 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 disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of an instruction or data structure 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 a 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.

[0101] 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.

[0102] 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.

[0103] Reference Figure 1-Figure 6 The present application provides a radiation air conditioning system 100 that can reduce the probability of condensation on the surface of the radiation air conditioning panel 21. According to the radiation air conditioning system 100 of the present application, the number of the radiation air conditioning panels 21 is n, n ≥ 1, the first flow path includes a total input pipe of the radiation air conditioning panel, the first flow path is divided into n first flow branches, and the n first flow branches flow through the n radiation air conditioning panels 21 respectively. The n radiation air conditioning panels 21 are connected in parallel.

[0104] It should be noted that a radiation air conditioning panel solenoid valve 51 is provided for each radiation air conditioning panel 21. Multiple radiation air conditioning panels 21 correspond to a radiation air conditioning panel solenoid valve 51 in total. One radiation air conditioning panel solenoid valve 51 can cut off or open the refrigerant inflow of all radiation air conditioning panels 21. Since the cooling capacity provided by the radiation air conditioning panel 21 is less than that provided by the indoor heat exchanger 22, the cooling capacity provided by a single radiation air conditioning panel 21 is less, and it is not necessary to provide a solenoid valve for each radiation air conditioning panel 21. There is little waste of cooling capacity. If a solenoid valve is provided for each radiation air conditioning panel 21, the total cost of the radiation air conditioning system 100 will be higher.

[0105] The number of indoor heat exchangers 22 is m, m ≥ 1, the second flow path includes a main input pipe of the indoor heat exchanger, the refrigerant flows through the middle input pipe of the indoor heat exchanger and is divided into m second flow branches, and the m second flow branches respectively flow through the m indoor heat exchangers 22. The m indoor heat exchangers 22 are connected in parallel.

[0106] 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.

[0107] It should be noted that the cooling or heating 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 the precise control of the cooling output, so as to meet the load while reducing the waste of cooling.

[0108] 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 .

[0109] 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.

[0110] The controller is configured to: after receiving a 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 .

[0111] 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, so that the radiation air conditioning panel 21 cannot work and cannot perform radiation heat exchange with the indoor environment.

[0112] 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.

[0113] It should be noted that the radiation 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 environment temperature value and the indoor environment humidity value respectively, and upload them to the controller.

[0114] After the radiation air conditioning system 100 is turned on, usually, 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 cold / heat 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.

[0115] The controller is configured to calculate the difference between the indoor ambient temperature value and the preset indoor ambient temperature value based on the indoor ambient temperature value uploaded by the indoor temperature detection device in the above process, and define it as the first temperature difference, and then determine whether the first temperature difference ΔT belongs to the target temperature interval [ΔT1, ΔT2]. If so, it is considered that the indoor ambient temperature is already in a stable state. If not, it is considered that the indoor ambient temperature is in an unstable state, and the indoor ambient temperature value continues to be detected, and whether the indoor ambient temperature is in a stable state is further determined according to the first temperature difference.

[0116] Optionally, the target temperature interval may be set to [-2, 2].

[0117] The radiant air conditioning system 100 includes a first pressure sensor 61 and a second pressure sensor 62, which are respectively used to detect the pressure at both ends of the evaporator. The first evaporator pressure sensor and the second pressure sensor 62 are respectively electrically connected to the controller to transmit the evaporation inlet section pressure and the evaporation outlet section pressure to the controller.

[0118] The first pressure sensor 61 is arranged on the pipeline connecting the evaporator and the electronic expansion valve 4, and is used to detect the pressure of the refrigerant at the inlet pipeline of the evaporator. The refrigerant is throttled and depressurized when flowing through the electronic expansion valve 4, and the refrigerant flowing out of the electronic expansion valve 4 flows into the indoor heat exchanger 22 or the radiation air conditioning panel 21. The first pressure sensor 61 detects the pressure of the refrigerant entering the evaporator, that is, the pressure of the refrigerant at the inlet of the evaporator.

[0119] The second pressure sensor 62 is disposed on the pipeline connecting the evaporator and the air inlet of the compressor 82, and is used to detect the pressure of the refrigerant at the outlet pipeline of the evaporator. The refrigerant undergoes an evaporation process in the evaporator, and the refrigerant flowing through the evaporator flows into the air inlet of the compressor 82, and is compressed into a high-temperature and high-pressure refrigerant inside the compressor 82. The second pressure sensor 62 detects the pressure of the refrigerant flowing out of the evaporator, that is, the pressure of the refrigerant at the outlet of the evaporator.

[0120] 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.

[0121] The radiant air conditioning system 100 includes a humidity detection device disposed in the indoor space. The humidity detection device is a humidity sensor in some embodiments and a temperature and humidity integrated sensor in other embodiments. The humidity detection device is electrically connected to the controller, and the humidity detection device detects the indoor environment humidity and uploads the indoor environment humidity value to the controller.

[0122] The controller calculates the dew point temperature based on the indoor humidity value and thermodynamic formula.

[0123] 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 .

[0124] When the evaporation temperature is equal to the dew point temperature, since there is 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 .

[0125] 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 radiation air conditioning panel 21 and the evaporation temperature, the airflow is likely to condense on the surface of the radiation air conditioning panel 21 at this time.

[0126] In other embodiments, when the controller determines that the indoor ambient temperature is in a stable state, 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 relationship between the dew point compensation temperature and the evaporation temperature is determined.

[0127] It should be noted that the dew point compensation temperature is the sum of the dew point temperature and the preset difference ΔT3. ΔT3 ≥ 0. If the evaporation temperature is greater than or equal to the dew point compensation temperature, the airflow will not condense on the surface of the radiation air conditioning panel 21, and the humidity condition of the indoor environment satisfies the condition that condensation will not occur on the radiation air conditioning panel 21.

[0128] The 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.

[0129] The controller is configured to: when the evaporation temperature is not less than the dew point compensation temperature, the controller determines 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.

[0130] The controller is configured as follows: if the frequency of compressor 82 is not less than f2, the controller determines that compressor 82 is operating in the high-capacity segment, and the higher frequency of 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.

[0131] 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.

[0132] At this time, the indoor load is still at a high level, 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.

[0133] 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 amount 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.

[0134] 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, 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.

[0135] 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.

[0136] If the frequency of compressor 82 is less than f1, the controller determines that compressor 82 is operating in the low-capacity stage. At this time, the load required by the indoor space is relatively small. The radiation air-conditioning panel solenoid valve 51 is first 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.

[0137] 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 amount 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 run and output a larger amount of cooling or heat to meet the indoor load.

[0138] 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 stably remain at the target indoor ambient temperature, and a larger amount of cooling 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] On the other hand, since the heat exchanger solenoid valve 52 is frequently opened or closed during time t4, the cooling or heating amount provided by the heat exchanger is large. Frequent starting or shutting down of the indoor heat exchanger 22 will cause excessive load fluctuations in the radiation air-conditioning system 100, resulting in the compressor 82 and components within the system needing to adapt to larger fluctuations, 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.

[0144] 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 of the radiation air conditioning panel solenoid valve 51.

[0145] 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 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 cold 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 cold or heat to the indoor space.

[0146] In some embodiments, j is 2 or 3 and k is 2 or 3.

[0147] In the prior art, radiation air conditioning systems include radiation air conditioning and convection air conditioning. In order to reduce the probability of condensation on the radiation air conditioning panels, some radiation air conditioning systems adjust the fresh air volume and dehumidification volume according to the usage requirements of different seasons, set the main air duct and the bypass air duct, and use valves to control the opening of different air ducts to reduce condensation on the radiation 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 the regulation of the radiation air conditioning system. Existing radiation air conditioning systems often have relatively complex control steps, and the effect of reducing condensation on the radiation air conditioning panels is not obvious, which affects the normal use of the radiation air conditioning system and brings a bad user experience.

[0148] 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 required number of sensors 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. Therefore, the radiation air-conditioning system can meet the load requirements and reduce the condensation risk, thereby optimizing the user experience.

[0149] Reference Figure 4 , Figure 5 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 The present application also provides a radiant air conditioning system 100 having a compressor 82 with dual air intakes and a single air exhaust port.

[0150] According to the radiation air conditioning system 100 of the present application, the number of radiation air conditioning panels 21 is n, n ≥ 1, the first flow path includes a total input pipe of the radiation 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 radiation air conditioning panels 21. The n radiation air conditioning panels 21 are connected in parallel.

[0151] 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.

[0152] The number of indoor heat exchangers 22 is m, m ≥ 1, the second flow path includes a main input pipe of the indoor heat exchanger, the refrigerant flows through the middle input pipe of the indoor heat exchanger and is divided into m second flow branches, and the m second flow branches respectively flow through the m indoor heat exchangers 22. The m indoor heat exchangers 22 are connected in parallel.

[0153] 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.

[0154] The radiation air conditioning system 100 includes an electronic expansion valve 4, which has two electronic expansion valves 4, including a first electronic expansion valve 41 and a second electronic expansion valve 42. The first electronic expansion valve is connected to the total input pipeline of the radiation air conditioning panel 21, and the second electronic expansion valve 42 is connected to the total input pipeline of the indoor heat exchanger 22. The two electronic expansion valves 4 are electrically connected to the controller respectively, and the controller outputs an electrical signal to adjust the opening of the electronic expansion valve 4, and the refrigerant is throttled when flowing through the two electronic expansion valves 4.

[0155] The compressor 82 includes two air intake ports and one air exhaust port, one of which is connected to the total output pipeline of the radiation air conditioning panel 21 through an air intake pipe, and the other air intake port 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.

[0156] 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 .

[0157] 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.

[0158] The controller is configured to: after receiving a 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 .

[0159] When the radiation air conditioning panel electromagnetic 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 inoperable. Optionally, the target temperature range may be set to [-2, 2].

[0160] 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.

[0161] The controller is configured to calculate the change rate d of the frequency of the compressor 82 within 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 it is considered that the compressor 82 is in a relatively stable operating state.

[0162] 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.

[0163] The controller is configured to determine that the compressor 82 is in a stable operation state if d is not greater than a preset change rate d1.

[0164] 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.

[0165] It should be noted that the dew point compensation temperature is the sum of the dew point temperature and the preset difference ΔT3. ΔT3 ≥ 0. If the evaporation temperature is greater than or equal to the dew point compensation temperature, the airflow will not condense on the surface of the radiation air conditioning panel 21, and the humidity condition of the indoor environment satisfies the condition that condensation will not occur on the radiation air conditioning panel 21.

[0166] Calculation method of evaporation temperature:

[0167] The radiation air conditioning system 100 includes an indoor temperature detection device and an indoor humidity detection device which are arranged in the indoor space, and are used to detect the indoor environment temperature value and the indoor environment humidity value respectively, and upload them to the controller.

[0168] The radiant air conditioning system 100 includes a first pressure sensor 61 and a second pressure sensor 62, which are respectively used to detect the pressure at both ends of the evaporator. The first evaporator pressure sensor and the second pressure sensor 62 are respectively electrically connected to the controller to transmit the evaporation inlet section pressure and the evaporation outlet section pressure to the controller.

[0169] The first pressure sensor 61 is arranged on the pipeline connecting the evaporator and the electronic expansion valve 4, and is used to detect the pressure of the refrigerant at the inlet pipeline of the evaporator. The refrigerant is throttled and depressurized when flowing through the electronic expansion valve 4, and the refrigerant flowing out of the electronic expansion valve 4 flows into the indoor heat exchanger 22 or the radiation air conditioning panel 21. The first pressure sensor 61 detects the pressure of the refrigerant entering the evaporator, that is, the pressure of the refrigerant at the inlet of the evaporator.

[0170] The second pressure sensor 62 is disposed on the pipeline connecting the evaporator and the air inlet of the compressor 82, and is used to detect the pressure of the refrigerant at the outlet pipeline of the evaporator. The refrigerant undergoes an evaporation process in the evaporator, and the refrigerant flowing through the evaporator flows into the air inlet of the compressor 82, and is compressed into a high-temperature and high-pressure refrigerant inside the compressor 82. The second pressure sensor 62 detects the pressure of the refrigerant flowing out of the evaporator, that is, the pressure of the refrigerant at the outlet of the evaporator.

[0171] The 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.

[0172] Calculation method of dew point temperature:

[0173] The radiant air conditioning system 100 includes a humidity detection device disposed in the indoor space. The humidity detection device is a humidity sensor in some embodiments and a temperature and humidity integrated sensor in other embodiments. The humidity detection device is electrically connected to the controller, and the humidity detection device detects the indoor environment humidity and uploads the indoor environment humidity value to the controller.

[0174] The controller calculates the dew point temperature based on the indoor humidity value and thermodynamic formula.

[0175] 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 passing 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 opening of the first electronic expansion valve 41 is stopped from being reduced. At this time, the opening of the first electronic expansion valve 41 is S1.

[0176] 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 per unit mass of the refrigerant does not fluctuate much, the reduction in the flow rate of the refrigerant will increase the amount of heat absorbed by the unit mass of the refrigerant during the evaporation process of the refrigerant in the radiation air-conditioning, thereby increasing the temperature of the refrigerant, 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.

[0177] On the other hand, reducing the opening of the first electronic expansion valve 41 will reduce the flow cross-sectional area of ​​the first electromagnetic expansion valve, making the throttling effect more significant. The dryness of the refrigerant will increase compared to before. The refrigerant with higher dryness will flow through the entire radiation air-conditioning panel 21 and enter the overheating state in advance, so that the evaporation temperature of the refrigerant will increase, 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.

[0178] 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.

[0179] When the radiation air conditioning system 100 operates under rated conditions, when the opening degree of the first electronic expansion valve 41 is adjusted to Sa, the evaporation temperature of the radiation air conditioning panel 21 is equal to the dew point temperature.

[0180] The controller is configured as:

[0181] 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, and 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 can supply cold air 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.

[0182] If the opening S1 of the first electronic expansion valve 41 is less than the preset opening Sa, it is determined that there is a high probability that condensation will occur in 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 cold air is output through convection air conditioning, which can effectively reduce the low operating efficiency of the radiation air-conditioning panel 21.

[0183] The compressor 82 includes two cylinders, each of which is connected to an air inlet. 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.

[0184] The controller is configured as follows: when the opening degree of the first electronic expansion valve 41 is S1, based on the indoor ambient temperature value uploaded by the indoor temperature detection device, the difference between the indoor ambient temperature value and the preset indoor ambient temperature value is calculated and defined as the first temperature difference, and then the first temperature difference ΔT is judged whether it belongs to the target temperature interval [ΔT1, ΔT2]. If so, it is considered that the indoor ambient temperature is already in a stable state. If not, it is considered that the indoor ambient temperature is in an unstable state, and the indoor ambient temperature value is continuously detected, and whether the indoor ambient temperature is in a stable state is further judged according to the first temperature difference.

[0185] The controller is configured to: when the indoor ambient temperature belongs to the target temperature interval [ΔT1, ΔT2], determine the magnitude relationship between the evaporation temperature and the dew point compensation temperature at this time;

[0186] If the evaporation temperature is not greater than the dew point compensation temperature, it is judged that the probability of condensed water precipitating on the surface of the radiation air-conditioning panel 21 is relatively 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.

[0187] If the evaporation temperature is greater than the dew point compensation temperature, it is determined that the probability of condensation water being precipitated 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 allow the convection air conditioning to output cold air to the indoor environment.

[0188] The controller is configured to: when the compressor 82 continuously runs 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, and then determine whether the first temperature difference ΔT belongs to the target temperature interval [ΔT1, ΔT2]. If the first temperature difference ΔT belongs to the target temperature interval, it is determined that the indoor ambient temperature is relatively stable at this time.

[0189] The controller is configured to: if the first temperature difference ΔT belongs to the target temperature interval [ΔT1, ΔT2], the controller determines 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.

[0190] 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 segment. The higher the frequency of the compressor 82 is, the higher the load demand in the room can be met. At this time, the compressor 82 is operating in the high capacity segment, the radiation air conditioning panel solenoid valve 51 is closed, and the heat exchanger solenoid valve 52 is opened, so that the indoor heat exchanger 22 releases cold energy to the room, so that the convection air conditioner outputs a large amount of

[0191] 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 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.

[0192] At this time, the indoor load is still at a high level, 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.

[0193] 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 amount 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.

[0194] 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, 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.

[0195] 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.

[0196] If the frequency of compressor 82 is less than the preset frequency f1, that is, the frequency of 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 demand.

[0197] 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.

[0198] Since the load corresponding to the radiation air conditioning panel 21 is relatively low, when the radiation air conditioning system 100 is configured with a compressor 82 with a single air intake and a single air exhaust, it is not possible to directly switch from only turning on the indoor heat exchanger 22 to turning on the radiation air conditioning panel 21. The radiation air conditioning system 100 of the present application is configured with a compressor 82 with two air intakes and one air exhaust. When it is detected that the compressor 82 is operating in a low-capacity segment, it can directly switch from only turning on the indoor heat exchanger 22 to turning on the radiation air conditioning panel 21. One cylinder of the compressor 82 is running, and the other cylinder is not running. This will not affect the stability of the operation of the compressor 82, reduce the probability of damage to the compressor 82, and can switch quickly, and the control logic is simpler.

[0199] 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 amount 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 run and output a larger amount of cooling or heat to meet the indoor load.

[0200] 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 stably remain at the target indoor ambient temperature, and a larger amount of cooling 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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] On the other hand, since the heat exchanger solenoid valve 52 is frequently opened or closed during time t4, the cooling or heating amount provided by the heat exchanger is large. Frequent starting or shutting down of the indoor heat exchanger 22 will cause excessive load fluctuations in the radiation air-conditioning system 100, resulting in the compressor 82 and components within the system needing to adapt to larger fluctuations, 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.

[0206] 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 of the radiation air conditioning panel solenoid valve 51.

[0207] 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 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 cold 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 cold or heat to the indoor space.

[0208] In some embodiments, j is 2 or 3 and k is 2 or 3.

[0209] In the prior art, radiation air conditioning systems include radiation air conditioning and convection air conditioning. In order to reduce the probability of condensation on the radiation air conditioning panels, some radiation air conditioning systems adjust the fresh air volume and dehumidification volume according to the usage requirements of different seasons, set the main air duct and the bypass air duct, and use valves to control the opening of different air ducts to reduce condensation on the radiation 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 the regulation of the radiation air conditioning system. Existing radiation air conditioning systems often have relatively complex control steps, and the effect of reducing condensation on the radiation air conditioning panels is not obvious, which affects the normal use of the radiation air conditioning system and brings a bad user experience.

[0210] 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, which can be directly switched to the low capacity segment for operation, further simplifying the control method.

[0211] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope 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; A compressor having two cylinders, each cylinder being provided with an air intake port; An outdoor heat exchanger is arranged in an outdoor space; A first parallel pipeline, wherein the indoor heat exchanger is connected in parallel with the radiation air conditioning panel to form a first parallel pipeline, wherein the first parallel pipeline includes a first total input pipeline for inputting refrigerant to the radiation air conditioning panel, and a second total input pipeline for inputting refrigerant to the indoor heat exchanger; A first electronic expansion valve connected to the first main input pipeline; a second electronic expansion valve, connected to the second main input pipeline; Heat exchanger solenoid valves, the number of which is the same as the indoor heat exchangers, are arranged in the first parallel branch and connected to the branch input pipe of each indoor heat exchanger; An indoor temperature detection device, which is arranged in the indoor space; A pressure detection device, used to measure 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 start-up signal, close the radiation air conditioning panel solenoid valve and open the heat exchanger solenoid valve; If the change rate d of the compressor frequency within the time t0 is not greater than the preset change rate d1, the evaporation temperature is calculated according to the evaporation inlet section pressure and the evaporation outlet section pressure in combination with the first logic, When the evaporation temperature is lower than the dew point compensation temperature, the opening of the first electronic expansion valve is gradually reduced until the evaporation temperature is not lower than the dew point compensation temperature, then the opening of the first electronic expansion valve is stopped from being reduced, and at this time the opening of the first electronic expansion valve is S1; If the opening degree S1 of the first electronic expansion valve is not less than the preset opening degree Sa, the electromagnetic valve of the radiation air conditioning panel is opened, the electromagnetic valve of the heat exchanger is opened, and the cycle is re-entered; If the opening degree S1 of the first electronic expansion valve is less than the preset opening degree Sa, the electromagnetic valve of the radiation air conditioning panel is closed and the electromagnetic valve of the heat exchanger is opened; If the compressor runs continuously for time t10, the difference between the indoor ambient temperature and the preset indoor ambient temperature is calculated and defined as the first temperature difference. When the first temperature difference ΔT belongs to the target temperature interval [ΔT1, ΔT2], If the compressor frequency is not less than the preset compressor frequency f2, the radiation 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 f1, the radiation 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 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 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, open the heat exchanger solenoid valve, 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, 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, characterized in that: The dew point compensation temperature is the sum of the dew point temperature and the preset difference ΔT3, ΔT3≥0.

6. The radiant air conditioning system according to claim 1 or 5, characterized in that: If the compressor frequency is less than f1 and the evaporation 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 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.

7. The radiant air conditioning system according to claim 1, characterized in that If the compressor frequency is less than f1 and the evaporation 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 difference ΔT between the indoor ambient temperature and the target indoor ambient temperature changes at a rate a of difference ΔT=0 and is not less than a preset temperature difference change rate a2, the radiation air conditioning panel solenoid valve is opened, and the heat exchanger solenoid valve is opened.

8. The radiant air conditioning system according to claim 1, characterized in that: If the compressor frequency is less than f1 and the evaporation 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, when the evaporation temperature is less than the dew point compensation temperature, the radiation air conditioning panel solenoid valve is opened and the heat exchanger solenoid valve is opened.

9. 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; A compressor having two cylinders, each cylinder being provided with an air intake port; An outdoor heat exchanger is arranged in an outdoor space; A first parallel pipeline, wherein the indoor heat exchanger is connected in parallel with the radiation air conditioning panel to form a first parallel pipeline, wherein the first parallel pipeline includes a first total input pipeline for inputting refrigerant to the radiation air conditioning panel, and a second total input pipeline for inputting refrigerant to the indoor heat exchanger; A first electronic expansion valve connected to the first main input pipeline; a second electronic expansion valve, connected to the second main input pipeline; Heat exchanger solenoid valves, the number of which is the same as the indoor heat exchangers, are arranged in the first parallel branch and connected to the branch input pipe of each heat exchanger; An indoor temperature detection device, which is arranged in the indoor space; A pressure detection device, used to measure 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 start-up signal, close the radiation air conditioning panel solenoid valve and open the heat exchanger solenoid valve; If the change rate d of the compressor frequency within the time t0 is not greater than the preset change rate d1, the evaporation temperature is calculated according to the evaporation inlet section pressure and the evaporation outlet section pressure according to the first logic, When the evaporation temperature is lower than the dew point compensation temperature, the opening of the first electronic expansion valve is gradually reduced until the evaporation temperature is not lower than the dew point compensation temperature, then the opening of the first electronic expansion valve is stopped from being reduced, and at this time the opening of the first electronic expansion valve is S1; If the opening degree S1 of the first electronic expansion valve is not less than the preset opening degree Sa, the electromagnetic valve of the radiation air conditioning panel is opened, the electromagnetic valve of the heat exchanger is opened, and the cycle is re-entered; If the opening degree S1 of the first electronic expansion valve is less than the preset opening degree Sa, the electromagnetic valve of the radiation air conditioning panel is closed and the electromagnetic valve of the heat exchanger is opened; If the compressor runs continuously for a period of time t10, the difference between the indoor ambient temperature and the preset indoor ambient temperature is calculated and defined as the first temperature difference. If the first temperature difference ΔT belongs to the target temperature interval [ΔT1, ΔT2], The compressor frequency is divided into high capacity segment, medium capacity segment and low capacity segment, and the compressor switches between different capacity segments to meet the indoor load demand; 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 energy section and the compressor frequency is detected to be 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; 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 of other heat exchanger solenoid valves.

10. The radiant air conditioning system according to claim 9, characterized in that 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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