Heat exchange system, air conditioner and control method thereof

Abstract

The application discloses a heat exchange system, an air conditioner and a control method thereof, wherein the heat exchange system comprises a refrigerant circulation heat exchange system, a water circulation heat exchange system and a radiation-convection coupled heat exchanger; the radiation-convection coupled heat exchanger comprises a radiation heat exchange assembly and a convection heat exchange assembly; the radiation heat exchange assembly is connected to the refrigerant circulation heat exchange system and the water circulation heat exchange system; the convection heat exchange assembly is connected to the refrigerant circulation heat exchange system; the convection heat exchange assembly and the radiation heat exchange assembly are arranged side by side and are arranged in thermal coupling with each other. The technical scheme of the application realizes two heat exchange modes of radiation and convection, increases the overall regulation flexibility of the system, and further realizes on-demand regulation of cold and heat of the heat exchange system through optimized control of the two modes of radiation and convection, and accelerates the dynamic response characteristics of the system, thereby solving the technical problem of slow dynamic response characteristics of the single radiation system in the background art.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a heat exchange system, an air conditioner, and a control method thereof. Background Technology

[0002] Radiant cooling and heating air conditioning systems are widely used in residential and public buildings due to their superior comfort. Currently, there are two main types of radiant terminal systems on the market: one combines plastic pipes with insulation boards and a plasterboard surface; the other combines plastic / copper pipes with insulation boards and a metal plate surface. Because traditional radiant terminal systems are primarily water-circulating heat exchange systems, during summer cooling, the high-temperature chilled water needs to exchange heat with the water pipe walls through heat conduction, and then the heat is transferred from the outside of the pipe walls to the plasterboard surface. This results in a significant inertia in the overall radiant cooling and heating air conditioning system. In other words, its dynamic response characteristics are slower compared to traditional air conditioning systems that rely primarily on air convection. Therefore, it cannot quickly lower the indoor air temperature, and it typically takes half a day or even a day to lower the indoor air temperature to the design temperature. Summary of the Invention

[0003] The main objective of this invention is to propose a heat exchange system designed to accelerate the dynamic response process of a radiation system.

[0004] To achieve the above objectives, the present invention proposes a heat exchange system comprising: Refrigerant circulation heat exchange system; Water circulation heat exchange system; and A radiation-convection coupled heat exchanger includes a radiation heat exchange component and a convection heat exchange component. The radiation heat exchange component is connected to the refrigerant circulation heat exchange system and the water circulation heat exchange system. The convection heat exchange component is connected to the refrigerant circulation heat exchange system. The convection heat exchange component and the radiation heat exchange component are arranged side by side and are thermally coupled to each other.

[0005] In one embodiment, the radiative heat exchange component has a water channel connected to a water circulation heat exchange system and a first refrigerant channel connected to a refrigerant circulation heat exchange system, and the convective heat exchange component has a second refrigerant channel connected to a refrigerant circulation heat exchange system; the first refrigerant channel and the second refrigerant channel are arranged in parallel.

[0006] In one embodiment, the refrigerant circulation heat exchange system includes a compressor, a first heat exchanger, a throttling valve, and a four-way reversing valve. The refrigerant passages of the first heat exchanger and the radiative-convection coupled heat exchanger are connected. The throttling valve is located between the first heat exchanger and the radiative-convection coupled heat exchanger. The refrigerant passages of both the first heat exchanger and the radiative-convection coupled heat exchanger are connected to the compressor via the four-way reversing valve. The water circulation heat exchange system includes a water tank and a water pump, which are connected to the water channel via water pipes.

[0007] In one embodiment, the heat exchange system further includes a fan adapted to supply air to the convection heat exchange component to accelerate the heat exchange efficiency between the convection heat exchange component and the air.

[0008] In one embodiment, the refrigerant circulation heat exchange system further includes branch pipes, which are configured to exchange heat with the water tank. The branch pipe is connected to the refrigerant circulation heat exchange system; a first control valve is provided on the branch pipe, which is used to control the opening or closing of the branch pipe.

[0009] In one embodiment, the branch line is connected in parallel with the connecting line between the radiative-convective coupled heat exchanger and the throttling valve.

[0010] In one embodiment, the radiant heat exchange assembly includes a radiant heat exchange plate having a first through hole and a second through hole. The first through hole allows water to pass through to form a water channel, and the second through hole allows refrigerant to pass through to form a first refrigerant channel.

[0011] In one embodiment, the convection heat exchange assembly includes a convection heat exchange plate and fins, the fins being located on the side of the convection heat exchange plate away from the radiation heat exchange plate; the convection heat exchange plate has a third through hole, the third through hole allowing refrigerant to pass through to form a second refrigerant channel.

[0012] In one embodiment, the refrigerant circulation heat exchange system further includes a control device and a flow control valve, wherein the first refrigerant channel and the second refrigerant channel are connected in parallel via the flow control valve; The control device is used to control the conduction direction of the flow control valve so that at least one of the first refrigerant channel and the second refrigerant channel is connected to the refrigerant circulation heat exchange system.

[0013] In one embodiment, the radiative heat exchange component is a plate heat exchanger, and / or the convective heat exchange component is a finned tube heat exchanger.

[0014] The present invention also proposes an air conditioner comprising the heat exchange system described in any of the preceding claims.

[0015] This invention also proposes a control method for an air conditioner, applied to an air conditioner with a radiative-convection coupled heat exchanger, wherein the radiative-convection coupled heat exchanger has a radiative heat exchange component and a convection heat exchange component, the radiative heat exchange component and the convection heat exchange component are arranged side by side and thermally coupled to each other; wherein, the control method includes the following steps: Obtain the indoor temperature value T0 of the space where the radiative-convective coupled heat exchanger is located; Obtain the target temperature value T1 of the air conditioner; The system selects to activate at least one of the radiative heat exchanger and the convective heat exchanger based on the temperature difference ΔT between the indoor temperature T0 and the target temperature T1.

[0016] In one embodiment, the step of selecting to activate at least one of the radiative heat exchanger and the convective heat exchanger based on the temperature difference ΔT between the indoor temperature value T0 and the target temperature value T1 includes: If ΔT is greater than the first preset value, control the operation of the convection heat exchange component; If ΔT is greater than the second preset value and less than the first preset value, control the operation of the convection heat exchange component and the radiation heat exchange component. If ΔT is less than the second preset value, control the operation of the radiative heat exchange component.

[0017] In one embodiment, the radiative heat exchange component has a water channel connected to a water circulation heat exchange system and a first refrigerant channel connected to a refrigerant circulation heat exchange system, and the convective heat exchange component has a second refrigerant channel connected to a refrigerant circulation heat exchange system; the first refrigerant channel and the second refrigerant channel are connected in parallel; wherein, the step of controlling the operation of the convective heat exchange component specifically includes: controlling the first refrigerant channel to shut off and the second refrigerant channel to open; The specific steps for controlling the operation of the convection heat exchanger and the radiation heat exchanger are as follows: controlling both the first refrigerant channel and the second refrigerant channel to be open; The specific steps for controlling the operation of the radiative heat exchange component are as follows: controlling the first refrigerant channel to be open and the second refrigerant channel to be closed.

[0018] The technical solution of this invention provides a heat exchange system that includes a radiation-convection coupled heat exchanger, realizing both radiation and convection heat exchange modes, increasing the overall adjustment flexibility of the system. In addition, through optimized control of both radiation and convection modes, the cooling and heating capacity of the heat exchange system can be adjusted on demand, and the dynamic response characteristics of the system can be accelerated, solving the technical problem of slow dynamic response characteristics of a single radiation system mentioned in the background art. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the heat exchange system of the present invention; Figure 2 This is a flowchart illustrating an embodiment of the control method for an air conditioner according to the present invention; Figure 3 This is a flowchart illustrating another embodiment of the control method for the air conditioner of the present invention.

[0021] Explanation of icon numbers: 10. Heat exchange system; 100. Radiant-convection coupled heat exchanger; 110. Radiant heat exchange component; 120. Convection heat exchange component; 200. Compressor; 300. Four-way reversing valve; 400. First heat exchanger; 500. Throttling valve; 600. Water tank; 700. Water pump; 800. Flow control valve; 900. First control valve; The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0025] This invention proposes a heat exchange system.

[0026] In embodiments of the present invention, such as Figures 1 to 3 As shown, the heat exchange system 10 includes a refrigerant circulation heat exchange system, a water circulation heat exchange system, and a radiation-convection coupled heat exchanger 100. The radiation-convection coupled heat exchanger 100 includes a radiation heat exchange component 110 and a convection heat exchange component 120. The radiation heat exchange component 110 is connected to the refrigerant circulation heat exchange system and the water circulation heat exchange system; the convection heat exchange component 120 is connected to the water circulation heat exchange system; the convection heat exchange component 120 and the radiation heat exchange component 110 are arranged side by side, and the convection heat exchange component 120 and the radiation heat exchange component 110 are thermally coupled to each other.

[0027] Generally, the radiant heat exchanger 110 is mainly used for radiant heat exchange using a heat exchange medium. Therefore, the radiant heat exchanger 110 needs to have a large contact area to ensure that the heat exchange medium can fully exchange heat with the ambient air. For example, the radiant heat exchanger 110 can be composed of a large number of capillary tubes or radiant plates (with built-in water pipes). Of course, to improve the heat exchange effect of the radiant heat exchanger 110, equipment such as fans can be installed to increase the airflow velocity on the surface of the radiant heat exchanger 110, thereby improving the heat exchange effect. The radiant heat exchanger 110 can be switched on and off according to the required power. For example, when the required power is low, some radiant heat exchangers 110 can be turned on, and when the required power is high, all radiant heat exchangers 110 can be turned on.

[0028] The radiant heat exchanger 110 and the convection heat exchanger 120 can be separate components, assembled together when the entire radiant-convection coupled heat exchanger 100 is installed in residential or public buildings. Typically, both are installed on the building's ceiling. In this case, the radiant heat exchanger 110 can be a plate heat exchanger, and the convection heat exchanger 120 can be a finned tube heat exchanger. Alternatively, the radiant heat exchanger 110 and the convection heat exchanger 120 can be pre-assembled at the factory. The convection heat exchange component 120 and the radiation heat exchange component 110 are arranged side by side, which generally includes two situations: one is that the convection heat exchange component 120 and the radiation heat exchange component 110 are arranged side by side in the horizontal direction, and the other is that the convection heat exchange component 120 and the radiation heat exchange component 110 are arranged side by side in the vertical direction. Of course, in other embodiments, the convection heat exchange component 120 and the radiation heat exchange component 110 can also be arranged side by side in other directions. In practical application scenarios, the convection heat exchange component 120 and the radiation heat exchange component 110 are usually arranged side by side in the vertical direction. This method is based on the fact that the heat exchange effect on the room is better when the radiation heat exchange component 110 is laid flat.

[0029] Furthermore, the convection heat exchange component 120 and the radiation heat exchange component 110 are thermally coupled to each other. That is, in this embodiment, during the initial stage of operation of the heat exchange system 10, to quickly lower or raise the indoor temperature, the flow control valve 800 is adjusted to direct all refrigerant to the side of the convection heat exchange component 120. When the indoor air parameters reach the set requirements, the water circulation heat exchange system is activated, and then the flow control valve 800 is adjusted again to direct all refrigerant to the radiation heat exchange component 110. Additionally, under certain operating conditions, it is necessary to simultaneously operate the convection heat exchange component 120 and the radiation heat exchange component 110. By adjusting the opening of the flow control valve 800, both components can operate simultaneously, thereby achieving coordinated operation of radiation and convection heat exchange and realizing certain optimized control objectives.

[0030] For example, the radiative heat exchange component 110 has a water channel connected to a water circulation heat exchange system and a first refrigerant channel connected to a refrigerant circulation heat exchange system, and the convective heat exchange component 120 has a second refrigerant channel connected to a refrigerant circulation heat exchange system; the first refrigerant channel and the second refrigerant channel are arranged in parallel. Thus, by controlling whether the first refrigerant channel and the second refrigerant channel are connected to the refrigerant circulation heat exchange system, it is possible to control the convective heat exchange component 120 to operate alone, the radiative heat exchange component 110 to operate alone, or the convective heat exchange component 120 and the radiative heat exchange component 110 to operate simultaneously.

[0031] Understandably, once the heat exchange system 10 is operating stably, only the radiant heat exchange components need to be operated. In the radiant heat exchange component 110, the high-temperature cold water circulation heat exchange system in summer and the low-temperature hot water circulation heat exchange system in winter can effectively improve heat exchange efficiency and reduce energy consumption. Here, "high-temperature water" and "low-temperature water" refer to the relative temperatures of the two water components, without specifying a particular temperature. Furthermore, embodiments of the present invention also utilize the heat exchange system 10 formed on the convection heat exchange component 120 side as a supplement, providing rapid response and eliminating the risk of condensation for the radiant water circulation heat exchange system, and also providing supplementation when its heat exchange capacity is insufficient.

[0032] The technical solution of this invention provides a heat exchange system 10 including a radiation-convection coupled heat exchanger 100, which realizes both radiation and convection heat exchange modes, increases the overall adjustment flexibility of the system, and achieves on-demand regulation of cooling and heating capacity of the heat exchange system 10 through optimized control of both radiation and convection modes, and accelerates the dynamic response characteristics of the system, thus solving the technical problem of slow dynamic response characteristics of a single radiation system mentioned in the background art.

[0033] In addition, both the radiant heat exchange component 110 and the convection heat exchange component 120 have heating and cooling modes. When working, the operating modes of the radiant heat exchange component 110 and the convection heat exchange component 120 are the same, that is, both the radiant heat exchange component 110 and the convection heat exchange component 120 operate in cooling mode or both operate in heating mode.

[0034] For example, the refrigerant circulation heat exchange system includes a compressor 200, a first heat exchanger 400, a throttling valve 500, and a four-way reversing valve 300. The refrigerant channels of the first heat exchanger 400 and the radiative-convection coupled heat exchanger 100 are connected. The throttling valve 500 is located between the first heat exchanger 400 and the radiative-convection coupled heat exchanger 100. The refrigerant channels of both the first heat exchanger 400 and the radiative-convection coupled heat exchanger 100 are connected to the compressor 200 through the four-way reversing valve 300. The water circulation heat exchange system includes a water pump 700 and necessary piping. The water pump 700 is connected to the water channel of the radiative heat exchange component 110 through piping. A water source is also required, typically a fixed water tank 600. In other words, the water tank 600 and the water pump 700 are connected to the water channel through water pipes to form a water circulation heat exchange system. Of course, in some embodiments, it is not ruled out that a fresh external water source can be directly connected.

[0035] Preferably, based on the embodiment with water tank 600, in order to accelerate the adjustment of water temperature, the refrigerant circulation heat exchange system further includes a branch pipe, which is connected to the water tank 600 for heat exchange and is connected to the refrigerant circulation heat exchange system; a first control valve 900 is provided on the branch pipe, which is used to control the opening or closing of the branch pipe. In this embodiment, a branch pipe is designed to allow refrigerant to enter the water tank 600 for heat exchange with the water before flowing back to the main pipe. The opening time and duration are adjusted by the first control valve 900. In the initial stage of the heat exchange system 10, that is, when only the convection heat exchange component 120 is turned on, the branch pipe is connected to the refrigerant circulation heat exchange system. In this way, the water in the water tank 600 can be heated or cooled by the refrigerant first. When the indoor air parameters reach the set requirements, the water temperature in the water tank 600 has also been cooled or heated to the required temperature, thereby speeding up the water temperature regulation and allowing it to play a faster role when switching to the radiant heat exchange system.

[0036] Furthermore, when the heat exchange system 10 is in cooling mode, in the initial stage of operation, to quickly lower or raise the indoor temperature, all the refrigerant flows to the side of the convection heat exchange component 120, thereby maximizing the working efficiency of the convection heat exchange component 120. In this embodiment, by connecting the branch pipe in parallel between the radiation-convection coupling heat exchanger 100 and the throttling valve 500, the refrigerant after passing through the convection heat exchange component 120 flows through the water tank 600, thereby improving the water temperature regulation of the water circulation heat exchange system without affecting the operation of the convection heat exchange component 120.

[0037] In one embodiment, the radiant heat exchange assembly 110 includes a radiant heat exchange plate having a first through hole and a second through hole. The first through hole allows water to pass through to form a water channel, and the second through hole allows refrigerant to pass through to form a first refrigerant channel.

[0038] In one embodiment, the convection heat exchange assembly 120 includes a convection heat exchange plate and fins, the fins being located on the side of the convection heat exchange plate away from the radiation heat exchange plate; the convection heat exchange plate has a third through hole, the third through hole allowing refrigerant to pass through to form a second refrigerant channel.

[0039] The fins, resembling wings and fish fins, are also called fins or fin plates, and are an effective method to increase the heat exchange area. A fin is an extended surface attached to a base surface, such as in condensers, radiators, and air heaters in refrigeration systems. Common fin shapes include trapezoidal, triangular, and rectangular fins. Factors affecting fin heat transfer include fin height, fin spacing, fin root temperature, and the thermophysical parameters of the fins. Preferably, the radiant heat exchange plate, the convective heat exchange plate, and the fins are made of copper, iron, or aluminum.

[0040] In one embodiment, the refrigerant circulation heat exchange system further includes a control device and a flow control valve 800, wherein the first refrigerant channel and the second refrigerant channel are connected in parallel via the flow control valve 800; the control device is used to control the conduction direction of the flow control valve 800 so that at least one of the first refrigerant channel and the second refrigerant channel is connected to the refrigerant circulation heat exchange system.

[0041] The number of flow control valves 800 can be one, two, three, or more. Two flow control valves 800 can be respectively installed at the inlet of the first refrigerant passage and the inlet of the second refrigerant passage, and at the outlet of the first refrigerant passage and the second refrigerant passage. This avoids the disruption of the entire refrigerant circulation heat exchange system due to the failure of a single flow control valve 800. It also prevents backflow when the local pressure in the first and second refrigerant passages is low. Therefore, in this embodiment, two flow control valves 800 are provided, and the two flow control valves 800 are used for synchronous regulation and control.

[0042] Understandably, the flow control valve mentioned here usually refers to a multi-way on / off valve. The number of ports on the valve is typically determined by the number of refrigerant channels. For example, with two refrigerant channels, a two-position three-way valve would suffice. Of course, the flow control valve here can also be a standalone on / off valve, meaning one valve controls one branch.

[0043] In another embodiment, the heat exchange system 10 further includes a fan adapted to supply air to the convection heat exchange component 120 to accelerate the heat exchange efficiency between the convection heat exchange component 120 and the air.

[0044] For example, the heat exchange system 10 is further provided with an air inlet and an air outlet for heat exchange between the convective heat exchange plate and the external environment, as well as an air passage connecting the air inlet and the air outlet. Both the air inlet and the air outlet are provided with a grid-like or louver-like air direction adjustment plate. The air outlet is located at the top upper end of the radiative-convective coupled heat exchanger 100, and the air outlet is located at the top side of the radiative-convective coupled heat exchanger 100. The air inlet is located at the bottom side of the radiative-convective coupled heat exchanger 100. A fan is provided at the air outlet inside the radiative-convective coupled heat exchanger 100. The fan can be frequency-variable or frequency-fixed.

[0045] When the fan uses a variable frequency motor, the airflow can be controlled by adjusting the fan speed to regulate the convective heat exchange and the outlet air temperature. The radiant-convective coupled heat exchanger 100 is also equipped with an indoor temperature sensor that works in conjunction with the fan to adjust the fan speed. The bottom of the radiant-convective coupled heat exchanger 100 has a condensate drain opening for discharging condensate generated during heat exchange in the convective heat exchange component 120. A condensate collection tray is located below the radiant-convective coupled heat exchanger 100 and the radiant heat exchange component 110, and a drain pipe is connected to the condensate collection tray via a drain valve. The condensate drain opening at the bottom of the radiant-convective coupled heat exchanger 100 allows some air to circulate, and condensate generated during cooling can drip into the condensate collection tray through this opening. The indoor temperature sensor is used to test the indoor temperature. By comparing the difference between the indoor temperature and the set temperature, the fan speed is controlled; a larger difference results in a larger fan speed, and a smaller difference results in a smaller fan speed.

[0046] In other embodiments, the fan may also be a fan located in the space where the heat exchange system is located, such as a floor fan or a ceiling fan.

[0047] In one specific embodiment, such as Figure 1 As shown. The heat exchange system 10 consists of a compressor 200, a first heat exchanger 400, a throttling valve 500, a radiation-convection coupling heat exchanger 100, a four-way reversing valve 300, a flow control valve 800, a water tank 600, a water pump 700, and necessary piping components. In this embodiment, the heat exchange system 10 includes both cooling and heating modes, which are described below: In cooling mode, the first heat exchanger 400 is the condenser, and the radiant-convection coupled heat exchanger 100 is the evaporator. The high-temperature and high-pressure refrigerant gas compressed by the compressor 200 passes through the four-way reversing valve, is condensed by the condenser, and then enters the expansion valve 500 to expand into a low-temperature and low-pressure gas-liquid two-phase state. It then enters the coupling terminal to provide cooling to the room, and finally flows back to the compressor 200 after passing through the four-way reversing valve.

[0048] In heating mode, the refrigerant first flows into the radiation-convection coupling heat exchanger 100 through the four-way reversing valve, releases heat, passes through the throttle valve 500, enters the first heat exchanger 400, absorbs heat and becomes a low-temperature, low-pressure gas, and then flows back to the compressor 200 through the four-way reversing valve.

[0049] Furthermore, the radiant heat exchange component 110 is a plate heat exchanger structure, where the refrigerant and water are separated by a thin metal plate, with water and refrigerant flowing on opposite sides of the metal plate, thereby regulating the water temperature and achieving a uniform surface temperature to form a radiant surface. The convection heat exchange component 120 is a finned tube heat exchanger, with refrigerant flowing inside the tubes and air flowing outside the tubes and undergoing enhanced heat transfer through the fins, thus controlling the temperature and humidity of the air.

[0050] When the system is in the start-up phase, if the indoor heat and humidity load is large, the air-side terminal is opened first, that is, the opening of the flow control valve 800 is calculated based on the collected indoor temperature and humidity parameters. Generally, in the initial stage, in order to quickly lower or raise the indoor temperature, the flow control valve 800 is adjusted so that all the refrigerant flows into the second refrigerant channel, that is, all the refrigerant acts on the convection heat exchange component 120. At this time, the first control valve 900 can be opened to make the water in the water tank 600 start to cool down or heat up, in preparation for the subsequent operation of the radiant heat exchange component 110. When the indoor air parameters reach the set requirements, the convection heat exchange component 120 can be closed and the radiant heat exchange component 110 can be turned on. That is, the flow control valve 800 is adjusted so that all the refrigerant flows into the first refrigerant channel, that is, all the refrigerant acts on one side of the radiant heat exchange component 110.

[0051] Of course, in some implementations, when it is necessary to operate both the radiant heat exchanger 110 and the convection heat exchanger 120 simultaneously, the opening of the flow control valve 800 can be adjusted to allow both sides to operate simultaneously, achieving coordinated operation between the air system and the water circulation heat exchange system. Generally, after the system is running stably, only the water circulation heat exchange system needs to be operated. The high-temperature cold water circulation heat exchange system in summer and the low-temperature hot water circulation heat exchange system in winter can effectively improve heat exchange efficiency and reduce energy consumption. The convection heat exchanger 120, as the end of the side air system, serves as a supplement, providing rapid response and eliminating the risk of condensation for the radiant water circulation heat exchange system, and also providing supplementation when its capacity is insufficient.

[0052] Preferably, to accelerate water temperature regulation, a branch pipe is designed to allow refrigerant to enter the water tank 600 for heat exchange with the water before flowing back to the main pipe. The opening time and duration are adjusted by the first control valve 900. The radiant-convection coupled heat exchanger 100 exchanges heat with water or air through refrigerant to achieve temperature and humidity control of the water or air.

[0053] The present invention also proposes an air conditioner having the heat exchange system 10. The specific structure of the heat exchange system 10 is as described in the above embodiments. Since the air conditioner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0054] Reference Figure 2 , Figure 2This is a flowchart illustrating the first embodiment of the control method for an air conditioner according to the present invention. Furthermore, to achieve the above objectives, the present invention also proposes a first embodiment of the control method for an air conditioner. This method is applied to an air conditioner having a radiative-convection coupled heat exchanger 100, wherein the radiative-convection coupled heat exchanger 100 has a radiative heat exchange component 110 and a convection heat exchange component 120, the radiative heat exchange component 110 and the convection heat exchange component 120 being arranged side-by-side and thermally coupled to each other; the control method includes the following steps: S10: Obtain the indoor temperature value T0 of the space where the radiation-convection coupled heat exchanger 100 is located; The indoor temperature T0 of the space where the radiant-convection coupled heat exchanger 100 is located can be detected by the temperature sensor installed on the radiant air conditioner.

[0055] S20: Obtain the target temperature value T1 of the air conditioner; The target temperature value T1 is the temperature value input by the user via remote control, etc., specifically the target value that the current room temperature needs to be achieved for the air conditioner's operation and control. The set temperature is specifically the temperature value currently stored in the corresponding storage area of ​​the memory.

[0056] The reference value is specifically a pre-set target room temperature value used to regulate the air conditioner's operation under the corresponding mode. Different modes correspond to different reference values. Specifically, the reference value for heating mode is lower than that for cooling mode.

[0057] S30: Select to turn on at least one of the radiative heat exchange component 110 and the convective heat exchange component 120 based on the temperature difference ΔT between the indoor temperature value T0 and the target temperature value T1.

[0058] In an embodiment of the present invention, during the initial stage of operation of the heat exchange system 10, in order to quickly lower or raise the indoor temperature, the flow control valve 800 is adjusted to allow all the refrigerant to flow to the side of the convection heat exchange component 120. When the indoor air parameters reach the set requirements, the water circulation heat exchange system is started, and then the flow control valve 800 is adjusted again to allow all the refrigerant to flow to the radiation heat exchange component 110. In addition, under certain operating conditions, it is necessary to simultaneously operate the convection heat exchange component 120 and the radiation heat exchange component 110. By adjusting the opening distribution of the flow control valve 800, the convection heat exchange component 120 and the radiation heat exchange component 110 can be operated simultaneously, thereby achieving the linkage and coordination of radiation heat exchange and convection heat exchange.

[0059] Furthermore, during the operation of the radiant heat exchange component 110, if the radiant temperature is too high, the water temperature of the water circulation heat exchange system can be lowered; if the radiant temperature is too low, the water temperature of the water circulation heat exchange system can be raised, thereby improving the user experience. For ease of control, a reference temperature can be set and compared with the radiant temperature to determine the high or low state of the radiant temperature.

[0060] In this embodiment, when the radiant heat exchange component 110 operates in cooling mode, condensation prevention is also necessary. Specifically, the control method may further include: acquiring environmental parameters of the working space, including dew point temperature; and increasing the water temperature of the water circulation heat exchange system when the radiant temperature is lower than the dew point temperature. When the radiant temperature is lower than the dew point temperature, it indicates that condensation is likely to occur in the working space. To avoid this, the temperature of the first radiant unit needs to be increased to raise the temperature within the working space. To improve control accuracy, the difference between the radiant temperature and the dew point temperature can also be judged. If the difference between the radiant temperature and the dew point temperature is less than a threshold, the water temperature of the water circulation heat exchange system is increased. The threshold value can vary depending on the radiant temperature.

[0061] For example, the step of selecting to activate at least one of the radiant heat exchanger 110 and the convective heat exchanger 120 based on the temperature difference ΔT between the indoor temperature value T0 and the target temperature value T1 includes: S31: If ΔT is greater than the first preset value, control the convection heat exchange component 120 to work; S32: If ΔT is greater than the second preset value and less than the first preset value, control the convective heat exchange component 120 and the radiative heat exchange component 110 to work. S33: If ΔT is less than the second preset value, control the radiative heat exchange component 110 to work.

[0062] The first preset value and the second preset value are the preset temperature values ​​currently stored in the corresponding storage area of ​​the memory. The reference value is specifically a pre-set target room temperature value used to regulate the air conditioner's operation in the corresponding mode. Different modes correspond to different reference values. For example, in cooling mode, the first preset value is 10℃, and the second preset value could be 5℃. Of course, the setting of the first and second preset values ​​needs to be determined based on the actual application environment.

[0063] Furthermore, the radiative heat exchange component 110 has a water channel connected to the water circulation heat exchange system and a first refrigerant channel connected to the refrigerant circulation heat exchange system, and the convective heat exchange component 120 has a second refrigerant channel connected to the refrigerant circulation heat exchange system; the first refrigerant channel and the second refrigerant channel are arranged in parallel; wherein, the specific steps of controlling the operation of the convective heat exchange component 120 are: controlling the first refrigerant channel to shut off and the second refrigerant channel to open; The specific steps for controlling the operation of the convection heat exchange component 120 and the radiation heat exchange component 110 are as follows: controlling both the first refrigerant channel and the second refrigerant channel to be open; The specific steps for controlling the operation of the radiant heat exchange component 110 are as follows: controlling the first refrigerant channel to be turned on and the second refrigerant channel to be turned off.

[0064] The opening and closing of the first and second refrigerant passages are controlled by flow control valves 800. The number of flow control valves 800 can be one, two, three, or more. Two flow control valves 800 can be respectively installed at the inlet and outlet of the first and second refrigerant passages. This avoids the disruption of the entire refrigerant circulation heat exchange system due to valve failure when only one flow control valve 800 is used. It also prevents backflow when the local pressure in the first and second refrigerant passages is low. Therefore, in this embodiment, two flow control valves 800 are used, and they are synchronously adjusted and controlled.

[0065] Understandably, the flow control valve 800 mentioned here typically refers to a multi-way on / off valve. The number of ports on the valve is usually determined by the actual number of refrigerant channels. For example, with two refrigerant channels, a two-position three-way valve would suffice for the flow control valve 800. Of course, the flow control valve 800 here can also be a standalone on / off valve, meaning one valve controls one branch.

[0066] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A heat exchange system, characterized in that, The heat exchange system includes: Refrigerant circulation heat exchange system; Water circulation heat exchange system; and A radiation-convection coupled heat exchanger includes a radiation heat exchange component and a convection heat exchange component, wherein the convection heat exchange component and the radiation heat exchange component are arranged side by side and are thermally coupled to each other. The radiative heat exchange component has a water channel connected to the water circulation heat exchange system and a first refrigerant channel connected to the refrigerant circulation heat exchange system; the convective heat exchange component has a second refrigerant channel connected to the refrigerant circulation heat exchange system; the first refrigerant channel and the second refrigerant channel are arranged in parallel. The refrigerant circulation heat exchange system includes a compressor, a first heat exchanger, a throttling valve, and a four-way reversing valve. The refrigerant channels of the first heat exchanger and the radiative-convection coupled heat exchanger are connected. The throttling valve is located between the first heat exchanger and the radiative-convection coupled heat exchanger. The refrigerant channels of both the first heat exchanger and the radiative-convection coupled heat exchanger are connected to the compressor via the four-way reversing valve. The water circulation heat exchange system includes a water tank and a water pump. The water tank and the water pump are connected to the water channels via water pipes. The refrigerant circulation heat exchange system further includes a branch pipeline, which is configured to exchange heat with the water tank and is connected to the refrigerant circulation heat exchange system; a first control valve is provided on the branch pipeline, which is used to control the opening or closing of the branch pipeline; The branch pipeline is connected in parallel with the connecting pipeline between the radiation-convection coupled heat exchanger and the throttling valve.

2. The heat exchange system as described in claim 1, characterized in that, The heat exchange system also includes a fan adapted to supply air to the convection heat exchange component to accelerate the heat exchange efficiency between the convection heat exchange component and the air.

3. The heat exchange system as described in claim 1, characterized in that, The radiant heat exchange component includes a radiant heat exchange plate, which has a first through hole and a second through hole. The first through hole allows water to pass through to form a water channel, and the second through hole allows refrigerant to pass through to form a first refrigerant channel.

4. The heat exchange system as described in claim 3, characterized in that, The convection heat exchange assembly includes a convection heat exchange plate and fins, the fins being located on the side of the convection heat exchange plate away from the radiation heat exchange plate; the convection heat exchange plate has a third through hole, the third through hole allowing refrigerant to pass through to form the second refrigerant channel.

5. The heat exchange system according to any one of claims 1-4, characterized in that, The refrigerant circulation heat exchange system also includes a control device and a flow control valve, wherein the first refrigerant channel and the second refrigerant channel are connected in parallel via the flow control valve; The control device is used to control the conduction direction of the flow control valve so that at least one of the first refrigerant channel and the second refrigerant channel is connected to the refrigerant circulation heat exchange system.

6. The heat exchange system as described in claim 5, characterized in that, The radiative heat exchange component is a plate heat exchanger, and / or the convective heat exchange component is a finned tube heat exchanger.

7. An air conditioner, characterized in that, Includes the heat exchange system as described in any one of claims 1 to 6.

8. A control method for an air conditioner, applied to the air conditioner as described in claim 7, characterized in that, The control method includes the following steps: Obtain the indoor temperature value T0 of the space where the radiative-convective coupled heat exchanger is located; Obtain the target temperature value T1 of the air conditioner; Based on the temperature difference ΔT between the indoor temperature value T0 and the target temperature value T1, at least one of the radiative heat exchange component and the convective heat exchange component is selected to be turned on. When the convection heat exchange component is turned on, the first control valve is opened to allow the refrigerant to exchange heat with the water in the water tank through the branch pipe, thereby pre-cooling or pre-heating the water in the water tank.

9. The control method for an air conditioner as described in claim 8, characterized in that, The step of selecting to activate at least one of the radiant heat exchanger and the convective heat exchanger based on the temperature difference ΔT between the indoor temperature value T0 and the target temperature value T1 includes: If ΔT is greater than the first preset value, control the operation of the convection heat exchange component; If ΔT is greater than the second preset value and less than the first preset value, control the operation of the convection heat exchange component and the radiation heat exchange component. If ΔT is less than the second preset value, control the operation of the radiative heat exchange component; The first preset value is greater than the second preset value.

10. The control method for an air conditioner as described in claim 9, characterized in that, The specific steps for controlling the operation of the convection heat exchange component are: controlling the first refrigerant channel to shut off and the second refrigerant channel to open; The specific steps for controlling the operation of the convection heat exchanger and the radiation heat exchanger are as follows: controlling both the first refrigerant channel and the second refrigerant channel to be open; The specific steps for controlling the operation of the radiative heat exchange component are as follows: controlling the first refrigerant channel to be open and the second refrigerant channel to be closed.

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