A coupling type floor heating system cold and hot linkage control method and coupling type floor heating system

Abstract

The application relates to a coupling type floor heating system cold-heat linkage control method and a coupling type floor heating system. The control method is characterized in that indoor ring temperature is acquired, a heating start threshold and a heating temperature difference of the indoor ring temperature are calculated, and a cooling temperature difference of the indoor ring temperature and a cooling start threshold is calculated; if the heating temperature difference is greater than or equal to a heating temperature difference threshold, heating control is performed; if the cooling temperature difference is greater than or equal to a cooling temperature difference threshold, cooling control is performed; and in other cases, standby is performed. The control method realizes that the heat pump floor heating system can operate under multiple working conditions: in summer, floor radiation cooling is combined with indoor air dehumidification to provide a cool and comfortable indoor environment for users; in winter, heat is extracted from central heating water to improve the problem of insufficient central heating effect; and in the spring and autumn transition seasons, especially before and after central heating, the system is switched to an air source heat pump mode, heat is absorbed from outdoor air through a finned tube heat exchanger, and the indoor temperature is maintained warm and comfortable.

Description

Technical Field

[0001] This invention relates to the field of heat pump control technology, and in particular to a method for controlling the cooling and heating linkage of a coupled underfloor heating system and the coupled underfloor heating system itself. Background Technology

[0002] As the main heating method in northern my country during winter, municipal centralized heating has problems such as system complexity, aging equipment, and differences in management level, which affect the heating effect and user experience.

[0003] In some municipal heating systems, defects in pipe network design and commissioning can easily lead to uneven heating between nearby and distant users. Meanwhile, some older or poorly managed areas still use time-of-use heating, further exacerbating heating instability. Furthermore, during the operation of centralized heating systems, inaccurate system water replenishment control or unauthorized water release by users can cause fluctuations in system operating pressure, directly affecting the continuity and balance of overall heating performance.

[0004] Based on the existing underfloor heating pipe system on the user side, a heat pump system (underfloor heating pad) capable of water-to-water heat exchange and an outdoor unit (finned tube heat exchanger) are added. This coupled, jointly controlled underfloor heating system can create a warm, comfortable, and stable indoor environment when the central heating is not working. Furthermore, before the central heating starts or during the transition period after it stops, the system uses the finned tube heat exchanger to obtain heat and maintain a warm indoor temperature. In addition, radiant cooling can be provided through the underfloor heating pipes in summer, and when combined with a dehumidifier (floor cooler), the drawback of condensation from radiant floor cooling can be solved, creating a comfortable and refreshing indoor environment.

[0005] This underfloor heating system, based on a coupled and jointly controlled system formed by underfloor heating pipes, can create an indoor environment that is comfortable for people all year round. Moreover, the water-to-water heat exchange heat pump system has high energy efficiency, which can significantly improve energy utilization efficiency and has the advantages of energy saving and environmental protection. Summary of the Invention

[0006] Therefore, the purpose of this invention is to provide a method for controlling the cooling and heating of a coupled underfloor heating system.

[0007] A method for controlling the cooling and heating linkage of a coupled underfloor heating system is disclosed, applicable to coupled underfloor heating systems. The coupled underfloor heating system includes a compressor, a first four-way valve, a water-based heat exchanger, an electronic expansion valve, and a second four-way valve, connected sequentially via refrigerant piping. A water source heat exchanger, an air source heat exchanger, and a third four-way valve are connected to other working ports of the second four-way valve, respectively. The other working ports of the third four-way valve are also connected to another refrigerant port of the water source heat exchanger and the air source heat exchanger, and are connected to the first four-way valve. The water piping of the water-based heat exchanger is connected to the heating end, and the water piping of the water source heat exchanger is connected to an external hot water source. The cooling and heating linkage control method includes the following steps:

[0008] Obtain indoor ambient temperature Calculate the heating start-up threshold With indoor ambient temperature Heating temperature difference and indoor ambient temperature With cooling start threshold Refrigeration temperature difference : If heating temperature difference ≥ Heating temperature difference threshold To control the heating; If the temperature difference of the cooling ≥ Cooling temperature difference threshold To control the cooling process; In other cases, standby mode is enabled. The heating control: Obtain the signal from the flow switch in the inlet pipe of the water source heat exchanger: If a water supply is available, the water source heating mode will be used; If there is no water supply, shut down the water source heat exchanger and switch to air source heating mode; The cooling control: Shut down the water source heat exchanger and control the first four-way valve to switch the direction so that the air source heat exchanger acts as a condenser and the water working fluid heat exchanger acts as an evaporator.

[0009] Furthermore, the water source heating mode is as follows: SA1: Determine indoor ambient temperature Is it greater than or equal to the set heating temperature? Hysteresis between heating and shutdown sum: If so, shut down the compressor; In other cases, proceed to step SA2; SA2: Obtain external water source temperature Refrigerant evaporation temperature of water source heat exchanger Calculate the temperature of the external water source and Heat source temperature difference : If the heat source temperature difference ≥Temperature difference threshold of the first heat source Control the water source heat exchanger to act as an evaporator and shut down the air source heat exchanger; If the temperature difference threshold of the second heat source ≤ Heat source temperature difference <First heat source temperature difference threshold Control the water source heat exchanger and the air source heat exchanger to act as a series evaporator; If the heat source temperature difference <Second heat source temperature difference threshold Control the air source heat exchanger to act as an evaporator and shut down the water source heat exchanger; SA3: Continuously monitor indoor ambient temperature Determine indoor ambient temperature Is it less than or equal to the set heating temperature? Hysteresis during heating start-up Difference: If yes, return to step SA2; If not, control the compressor to stop.

[0010] Furthermore, the air source heating mode is as follows: SC1: Obtain the frosting status of the air source heat exchanger: If the air source heat exchanger is frosted, execute the defrost mode; If there is no frost on the air source heat exchanger, proceed to step SC2; SC2: Obtain indoor ambient temperature Determine indoor ambient temperature Is it greater than or equal to the set heating temperature? Hysteresis between heating and shutdown sum: If so, shut down the compressor; In other cases, proceed to step SC3; SC3: Control the air source heat exchanger to act as an evaporator and the water working fluid heat exchanger to act as a condenser; SC4: Continuously monitor indoor ambient temperature Determine indoor ambient temperature Is it less than or equal to the set heating temperature? Hysteresis during heating start-up Difference: If yes, return to step SC3; If not, control the compressor to stop.

[0011] Furthermore, the defrosting mode is as follows: Obtain the compressor's heating operation time and determine whether the compressor's heating operation time is greater than or equal to the compressor's maximum continuous heating operation time: If so, control the first four-way valve to switch, so that the air source heat exchanger acts as a condenser and the water working fluid heat exchanger acts as an evaporator; Continuously acquire the compressor's defrost operating time and determine whether the compressor's defrost operating time is greater than or equal to the compressor's minimum defrost operating time: If so, exit defrost mode and proceed to step SC2.

[0012] Furthermore, the heating temperature difference threshold With indoor ambient temperature The following relation exists: When the indoor ambient temperature The current indoor temperature, the heating temperature difference threshold. Set to 5℃; When the indoor ambient temperature When the average ambient temperature value is collected for the second set time period t2, the heating temperature difference threshold is... Set to 3℃, where the second set time period t2 is set to 1 hour; When the indoor ambient temperature When the average ambient temperature value is collected for the third set time period t3, the heating temperature difference threshold is... Set to 1℃, where the third time period t3 is set to 24 hours.

[0013] Furthermore, the refrigeration control includes: SD1: Obtain indoor ambient temperature Determine indoor ambient temperature Is it less than or equal to the set cooling temperature? Hysteresis with refrigeration shutdown Difference: If so, shut down the compressor; In other cases, proceed to step SD2; SD2: Controls the air source heat exchanger to act as the condenser and the water-based water heater to act as the evaporator; SD3: Continuously acquire indoor ambient temperature Determine indoor ambient temperature Is it greater than or equal to the set cooling temperature? Hysteresis during cooling start sum: If yes, return to step SD2; If not, control the compressor to stop.

[0014] Furthermore, the cooling temperature difference threshold With indoor ambient temperature The following relation exists: When the indoor ambient temperature The current indoor temperature, and the cooling temperature difference threshold. Set to 5℃; When the indoor ambient temperature When the average ambient temperature value is collected for the fourth set time period t4, the cooling temperature difference threshold is... Set to 3℃, where the fourth time period t4 is set to 1 hour; When the indoor ambient temperature When the average ambient temperature value collected during the fifth set time period t5 is used, the cooling temperature difference threshold is... Set to 1℃, where the fifth time period t5 is set to 24 hours.

[0015] Furthermore, it also includes step S1: Obtain the operating mode of the coupled underfloor heating system: If it is in heating mode, calculate the heating start-up threshold. With indoor ambient temperature Heating temperature difference ; If in cooling mode, calculate the indoor ambient temperature. With cooling start threshold Refrigeration temperature difference .

[0016] Furthermore, the operating mode of the coupled underfloor heating system is determined by the following method: Obtain indoor ambient temperature : If the indoor ambient temperature Less than the heating start-up threshold The coupled underfloor heating system determines that the working mode is heating mode; If the indoor ambient temperature Greater than the cooling start-up threshold The coupled underfloor heating system determines that the working mode is cooling mode; In other cases, the coupled underfloor heating system decides to standby.

[0017] Compared to existing technologies, this invention, through a heat pump underfloor heating system coupled with centralized heating and a designed cold-heat linkage control method, enables the heat pump underfloor heating system to operate under multiple conditions: In summer, it provides a cool and comfortable indoor environment by combining floor radiant cooling with indoor air dehumidification; in winter, it extracts heat from the centralized heating water to increase the inlet water temperature of the underfloor heating system, improving the insufficient effect of centralized heating; during the spring and autumn transition seasons, especially before and after centralized heating, the system switches to air source heat pump mode, absorbing heat from the outdoor air through finned tube heat exchangers to maintain a warm and comfortable indoor environment. This system achieves efficient and stable indoor environmental regulation throughout the year through the coordinated use of multiple heat sources and intelligent switching of operating conditions.

[0018] Meanwhile, the present invention also provides a coupled underfloor heating system, including a compressor, a first four-way valve, a water-based heat exchanger, an electronic expansion valve, and a second four-way valve connected sequentially via refrigerant pipelines, a water source heat exchanger, an air source heat exchanger, and a third four-way valve respectively connected to other working ports of the second four-way valve, wherein the other working ports of the third four-way valve are also respectively connected to another refrigerant port of the water source heat exchanger and the air source heat exchanger and connected to the first four-way valve, and also include a temperature detection unit, and a controller electrically and / or communicatively connected to the compressor, the first four-way valve, the second four-way valve, the third four-way valve, and the temperature detection unit, wherein the controller implements the cold and heat linkage control method of the coupled underfloor heating system described in any of the above claims.

[0019] Compared with the prior art, the beneficial effects of the coupled underfloor heating system provided by the present invention are the same as those of the above-mentioned coupled underfloor heating system cold and heat linkage control method, and will not be repeated here. Attached Figure Description

[0020] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the coupled underfloor heating system of the present invention; Figure 2 This is a flowchart of the cold and heat linkage control method for the coupled underfloor heating system of the present invention. Detailed Implementation

[0022] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings of the embodiments of the present invention. The described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0023] Please see Figure 1The coupled underfloor heating system proposed in this invention includes a compressor 1, a first four-way valve 2, a water-based heat exchanger 3, an electronic expansion valve 4, and a second four-way valve 5 connected sequentially via refrigerant pipelines. A water source heat exchanger 6, an air source heat exchanger 7, and a third four-way valve 8 are respectively connected to the other working ports of the second four-way valve 5. The other working ports of the third four-way valve 8 are respectively connected to another refrigerant port of the water source heat exchanger 6, the air source heat exchanger 7, and the first four-way valve 2. The system also includes a temperature detection unit and a controller electrically and / or communicatively connected to the compressor 1, the first four-way valve 2, the second four-way valve 5, the third four-way valve 8, and the temperature detection unit.

[0024] The compressor 1 includes an exhaust port A and a return port B. Further, an oil separator is connected between the compressor 1 exhaust port A and the first four-way valve 2. Further, a gas-liquid separator is connected between the compressor 1 return port B and the first four-way valve 2.

[0025] The first four-way valve 2 includes a first working port D, a first working port E, a first working port S, and a first working port C. The first working port D is connected to the exhaust port A of the compressor 1 via an oil separator, the first working port E is connected to the third four-way valve 8, the first working port S is connected to the return port B of the compressor 1, and the first working port C is connected to a refrigerant port of the water-based heat exchanger 3.

[0026] The water-based heat exchanger 3 has one refrigerant port connected to the exhaust port A of the compressor 11, and the other refrigerant port connected to the electronic expansion valve 4; its water pipe is connected to the heating terminal water pipe. The water-based heat exchanger 3 is installed indoors and is a shell-and-tube heat exchanger, a plate heat exchanger, or a high-efficiency tank heat exchanger. Furthermore, a water pump 302 is installed on the return water pipe of the water-based heat exchanger 3 and the heating terminal water pipe, and a water tank 304 is installed on the supply water pipe of the water-based heat exchanger 3 and the heating terminal water pipe.

[0027] The second four-way valve 5 includes a second working port D', a second working port E', a second working port S', and a second working port C'. The second working port D' is connected to the electronic expansion valve 4, the second working port E' is connected to a refrigerant port of the water source heat exchanger 6, the second working port S' is connected to the third four-way valve 8, and the second working port C' is connected to a refrigerant port of the air source heat exchanger 7.

[0028] The water source heat exchanger 6 has its refrigerant pipeline connected at both ends to the second four-way valve 5 and the third four-way valve 8, respectively; its water pipeline is connected to the central heating water pipeline. The water source heat exchanger 6 is installed indoors and is a shell-and-tube heat exchanger, a plate heat exchanger, or a high-efficiency tank heat exchanger. Furthermore, the water source heat exchanger 6 is arranged separately from the water-based heat exchanger 3. The central heating water pipeline includes a heating inlet pipeline 602, a heating return pipeline 604, and a flow switch 606 installed on the heating inlet pipeline 602.

[0029] The air source heat exchanger 7 has its refrigerant pipeline connected at both ends to the second four-way valve 5 and the third four-way valve 8, respectively. The air source heat exchanger 7 is located outdoors and is a finned heat exchanger. Furthermore, a liquid valve 702 is installed between the air source heat exchanger 7 and the second four-way valve 5, and a gas valve 704 is installed between the air source heat exchanger 7 and the third four-way valve 8.

[0030] The third four-way valve 8 includes a third working port D``, a third working port E``, a third working port S``, and a third working port C``. The third working port D`` is connected to the first working port E`, the third working port E`` is connected to another refrigerant port of the air source heat exchanger 7, the third working port S`` is connected to the second working port S` of the third four-way valve 8, and the third working port C`` is connected to another refrigerant port of the water source heat exchanger 6.

[0031] By connecting the second four-way valve 5 and the third four-way valve 8, the water source heat exchanger 6 and the air source heat exchanger 7 can be connected in series as evaporators; by connecting the first four-way valve 3 and the second four-way valve 5, the defrosting of the air source heat exchanger 7 can be achieved.

[0032] The third four-way valve 8 is connected, the first working port S is connected to the return port B of the compressor 1, and the first working port C is connected to the refrigerant port of the water heat exchanger 3.

[0033] The temperature detection unit includes a first temperature sensor and a second temperature sensor.

[0034] The first temperature sensor is installed indoors at the heating terminal to measure the indoor ambient temperature. And monitor the indoor ambient temperature in real time. Transmitted to the controller.

[0035] The second temperature sensor is installed on the heating inlet pipe of the centralized heating water pipeline connected to the water pipeline of the water source heat exchanger 6, and is used to measure the temperature of the external water source. And real-time external water source temperature Transmitted to the controller.

[0036] The second temperature sensor is installed on the gas-liquid two-phase side of the refrigerant pipeline of the water source heat exchanger 6, and is used to measure the evaporation temperature of the water source heat exchanger 6. and the evaporation temperature is displayed in real time. Transmitted to the controller.

[0037] The controller acquires data transmitted from the temperature detection unit and the compressor, and controls the opening and closing of the first four-way valve, the second four-way valve, the third four-way valve, and the water flow switch according to the coupled floor heating system cold and heat linkage control method.

[0038] Please see Figure 2 The controller achieves the cold and heat linkage control of the coupled underfloor heating system in the following manner, specifically including the following steps.

[0039] S1: Obtain the operating mode of the coupled underfloor heating system: If it is in heating mode, execute S2; If it is in cooling mode, execute S3.

[0040] In practice, the operating mode of the coupled underfloor heating system can be obtained through user settings, or the operating mode can be automatically determined using the following methods: Obtain indoor ambient temperature : If the indoor ambient temperature Less than the heating start-up threshold The coupled underfloor heating system determines that the working mode is heating mode; If the indoor ambient temperature Greater than the cooling start-up threshold The coupled underfloor heating system determines that the working mode is cooling mode; In other cases, the coupled underfloor heating system decides to standby.

[0041] Specifically, the heating start-up threshold is set to 18℃~20℃, and the cooling start-up threshold is set to 25℃~27℃.

[0042] The indoor ambient temperature To set the average ambient temperature based on N indoor temperature measurements collected within the first time period, the specific indoor ambient temperature... satisfy: .

[0043] Example: If the first time period is set to 5 minutes, and data is collected 3 times per minute, then a total of 15 data collections will be performed.

[0044] S2: Obtain indoor ambient temperature Calculate the heating start-up threshold With indoor ambient temperature Heating temperature difference : If heating temperature difference ≥ Heating temperature difference threshold To control the heating; Otherwise, standby mode.

[0045] The heating temperature difference satisfy: = - .

[0046] The heating temperature difference threshold With indoor ambient temperature The following relation exists: When the indoor ambient temperature The current indoor temperature, the heating temperature difference threshold. Set to 5℃; When the indoor ambient temperature When the average ambient temperature value is collected for the second set time period t2, the heating temperature difference threshold is... Set to 3℃, where the second set time period t2 is set to 1 hour; When the indoor ambient temperature When the average ambient temperature value is collected for the third set time period t3, the heating temperature difference threshold is... Set to 1℃, where the third time period t3 is set to 24 hours.

[0047] The heating control includes: Obtain the signal from the flow switch in the inlet pipe of the water source heat exchanger: If water supply is available, i.e. the water flow switch signal is 1, the water source heating mode is executed; If there is no water supply (i.e., the water flow switch signal is 0), shut down the water source heat exchanger and execute the air source heating mode. Step SC.

[0048] The water source heating mode is as follows: SA1: Determine indoor ambient temperature Is it greater than or equal to the set heating temperature? Hysteresis between heating and shutdown sum: If so, shut down the compressor; In other cases, proceed to step SA2.

[0049] SA2: Obtain external water source temperature Refrigerant evaporation temperature of water source heat exchanger Calculate the temperature of the external water source and Heat source temperature difference : If the heat source temperature difference ≥Temperature difference threshold of the first heat source Control the water source heat exchanger to act as an evaporator and shut down the air source heat exchanger; Specifically, the first working port D and the first working port C of the first four-way valve are open, the first working port E and the first working port S of the first four-way valve are open; the second working port D' and the second working port E' of the second four-way valve are open; the third working port C'' and the third working port D'' of the third four-way valve are open; the gas valve and the liquid valve are closed, forming a refrigerant circulation loop of compressor-first four-way valve-water heat exchanger-electronic expansion valve-second four-way valve-water source heat exchanger-third four-way valve-first four-way valve-compressor; If the temperature difference threshold of the second heat source ≤ Heat source temperature difference <First heat source temperature difference threshold Control the water source heat exchanger and the air source heat exchanger to act as a series evaporator; Specifically, the first working ports D and C of the first four-way valve are open, as are the first working ports E and S of the first four-way valve; the second working ports D' and E' of the second four-way valve are open, as are the second working ports C' and S' of the second four-way valve; the third working ports C'' and E'' of the third four-way valve are open, as are the third working ports S'' and D'' of the third four-way valve; and the gas valve and liquid valve are open, forming a refrigerant circulation loop of compressor-first four-way valve-water heat exchanger-electronic expansion valve-second four-way valve-water source heat exchanger-third four-way valve-air source heat exchanger-second four-way valve-third four-way valve-first four-way valve-compressor; If the heat source temperature difference <Second heat source temperature difference threshold Control the air source heat exchanger to act as an evaporator and shut down the water source heat exchanger; Specifically, the first working port D and the first working port C of the first four-way valve are connected; the first working port E and the first working port S of the first four-way valve are connected; the second working port D' and the second working port C' of the second four-way valve are connected; the third working port E'' and the third working port D'' of the third four-way valve are connected; and the gas valve and the liquid valve are connected, forming a refrigerant circulation loop of compressor-first four-way valve-water heat exchanger-electronic expansion valve-second four-way valve-air source heat exchanger-third four-way valve-first four-way valve-compressor.

[0050] SA3: Continuously monitor indoor ambient temperature Determine indoor ambient temperature Is it less than or equal to the set heating temperature? Hysteresis during heating start-up Difference: If yes, return to step SA2; If not, control the compressor to stop.

[0051] The heat source temperature difference satisfy: .

[0052] First heat source temperature difference threshold >Second heat source temperature difference threshold >0.

[0053] The air source heating mode is as follows: SC1: Obtain the frosting status of the air source heat exchanger: If the air source heat exchanger is frosted, execute the defrost mode; If there is no frost on the air source heat exchanger, proceed to step SC2.

[0054] The defrosting mode is not limited in this application. Conventional defrosting control can be performed based on the compressor's running time, the coil temperature, or changes in air resistance or air volume.

[0055] For example, defrosting control can be achieved using the compressor's runtime: Obtain the compressor's heating operation time and determine whether the compressor's heating operation time is greater than or equal to the compressor's maximum continuous heating operation time: If so, control the first four-way valve to switch, so that the air source heat exchanger acts as a condenser and the water working fluid heat exchanger acts as an evaporator; Continuously acquire the compressor's defrost operating time and determine whether the compressor's defrost operating time is greater than or equal to the compressor's minimum defrost operating time: If so, exit defrost mode and proceed to step SC2.

[0056] SC2: Obtain indoor ambient temperature Determine indoor ambient temperature Is it greater than or equal to the set heating temperature? Hysteresis between heating and shutdown sum: If so, shut down the compressor; In other cases, proceed to step SC3.

[0057] SC3: Control the air source heat exchanger to act as an evaporator and the water working medium heat exchanger to act as a condenser.

[0058] Specifically, the first working port D and the first working port C of the first four-way valve are connected; the first working port E and the first working port S of the first four-way valve are connected; the second working port D' and the second working port C' of the second four-way valve are connected; the third working port E'' and the third working port D'' of the third four-way valve are connected; and the gas valve and the liquid valve are connected, forming a refrigerant circulation loop of compressor-first four-way valve-water heat exchanger-electronic expansion valve-second four-way valve-air source heat exchanger-third four-way valve-first four-way valve-compressor.

[0059] SC4: Continuously monitor indoor ambient temperature Determine indoor ambient temperature Is it less than or equal to the set heating temperature? Hysteresis during heating start-up Difference: If yes, return to step SC3; If not, control the compressor to stop.

[0060] S3: Obtain indoor ambient temperature Calculate indoor ambient temperature With cooling start threshold Refrigeration temperature difference : If the temperature difference of the cooling ≥ Cooling temperature difference threshold To control the cooling process; Otherwise, standby mode.

[0061] The cooling temperature difference satisfy: = .

[0062] The cooling temperature difference threshold With indoor ambient temperature The following relation exists: When the indoor ambient temperature The current indoor temperature, and the cooling temperature difference threshold. Set to 5℃; When the indoor ambient temperature When the average ambient temperature value is collected for the fourth set time period t4, the cooling temperature difference threshold is... Set to 3℃, where the fourth time period t4 is set to 1 hour; When the indoor ambient temperature When the average ambient temperature value collected during the fifth set time period t5 is used, the cooling temperature difference threshold is... Set to 1℃, where the fifth time period t5 is set to 24 hours.

[0063] The refrigeration control includes: SD1: Obtain indoor ambient temperature Determine indoor ambient temperature Is it less than or equal to the set cooling temperature? Hysteresis with refrigeration shutdown Difference: If so, shut down the compressor; In other cases, proceed to step SD2.

[0064] SD2: Controls the air source heat exchanger to act as the condenser and the water-based water heater to act as the evaporator.

[0065] Specifically, the first working ports D and E of the first four-way valve are open, as are the first working ports C and S of the first four-way valve; the second working ports D' and C' of the second four-way valve are open; the third working ports E'' and D'' of the third four-way valve are open; and the gas valve and liquid valve are open, forming a refrigerant circulation loop of compressor-first four-way valve-third four-way valve-air source heat exchanger-second four-way valve-electronic expansion valve-water working fluid heat exchanger-first four-way valve-compressor.

[0066] SD3: Continuously acquire indoor ambient temperature Determine indoor ambient temperature Is it greater than or equal to the set cooling temperature? Hysteresis during cooling start sum: If yes, return to step SD2; If not, control the compressor to stop.

[0067] Compared to existing technologies, this invention, through a heat pump underfloor heating system coupled with centralized heating and a designed cold-heat linkage control method, enables the heat pump underfloor heating system to operate under various conditions: In summer, it provides a cool and comfortable indoor environment by combining floor radiant cooling with indoor air dehumidification; in winter, it extracts heat from the centralized heating water to increase the inlet water temperature of the underfloor heating system, improving the insufficient effect of centralized heating; during the spring and autumn transition seasons, especially before and after centralized heating, the system switches to air source heat pump mode, absorbing heat from the outdoor air through finned tube heat exchangers to maintain a warm and comfortable indoor environment. This system achieves efficient and stable indoor environmental regulation throughout the year through the coordinated use of multiple heat sources and intelligent switching of operating conditions.

[0068] The aforementioned method for controlling the heating and cooling of a coupled underfloor heating system is stored in an electronic device and executed by this device to achieve the coordinated control of the heating and cooling of the coupled underfloor heating system. The electronic device includes, but is not limited to, a memory, a processor, and a network interface that can communicate with each other via a system bus.

[0069] The memory includes at least one type of readable storage medium, including flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disk, etc. The memory can be an internal storage unit of the electronic device, such as the hard disk or RAM of the electronic device. The memory can also be an external storage device of the electronic device, such as a plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, etc. The memory may also include both internal storage units and external storage devices of the electronic device.

[0070] The processor can be a central processing unit (CPU), controller, microcontroller, microprocessor, or other data processing chip. This processor is typically used to control the overall operation of the electronic device, such as performing control and processing related to data interaction or communication with the electronic device. The processor is used to run program code stored in the memory or process data, for example, to run the coupled underfloor heating system's hot and cold linkage control method.

[0071] The network interface may include a wireless network interface or a wired network interface, which is typically used to establish communication connections between the electronic device and other electronic devices. For example, the network interface is used to connect the electronic device to an external data platform via a network, establishing a data transmission channel and communication connection between the electronic device and the external data platform. The network may be an intranet, the Internet, Global System for Mobile communication (GSM), Wideband Code Division Multiple Access (WCDMA), 4G network, 5G network, Bluetooth, Wi-Fi, or other wireless or wired networks.

[0072] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0073] Furthermore, the use of terms such as "first" and "second" in this invention is 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, features defined with "first" and "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0074] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and the present invention also intends to include these modifications and variations.

Claims

1. A method for controlling the cooling and heating linkage of a coupled underfloor heating system, characterized in that, This method is applicable to coupled underfloor heating systems, which include a compressor, a first four-way valve, a water-based heat exchanger, an electronic expansion valve, and a second four-way valve connected sequentially via refrigerant piping. A water source heat exchanger, an air source heat exchanger, and a third four-way valve are connected to the other working ports of the second four-way valve, respectively. The other working ports of the third four-way valve are also connected to another refrigerant port of the water source heat exchanger and the air source heat exchanger, and are connected to the first four-way valve. The cooling and heating linkage control method includes the following steps: Obtain indoor ambient temperature Calculate the heating start-up threshold With indoor ambient temperature Heating temperature difference and indoor ambient temperature With cooling start threshold Refrigeration temperature difference : If heating temperature difference ≥ Heating temperature difference threshold To control the heating; If the temperature difference of the cooling ≥ Cooling temperature difference threshold To control the cooling process; In other cases, standby mode is enabled. The heating control: Obtain the signal from the flow switch in the inlet pipe of the water source heat exchanger: If a water supply is available, the water source heating mode will be used; If there is no water supply, shut down the water source heat exchanger and switch to air source heating mode; The cooling control: Shut down the water source heat exchanger and control the first four-way valve to switch the direction so that the air source heat exchanger acts as a condenser and the water working fluid heat exchanger acts as an evaporator.

2. The method for controlling the cooling and heating linkage of a coupled underfloor heating system according to claim 1, characterized in that, The water source heating mode is as follows: SA1: Determine indoor ambient temperature Is it greater than or equal to the set heating temperature? Hysteresis between heating and shutdown sum: If so, shut down the compressor; In other cases, proceed to step SA2; SA2: Obtain external water source temperature Refrigerant evaporation temperature of water source heat exchanger Calculate the temperature of the external water source and Heat source temperature difference : If the heat source temperature difference ≥Temperature difference threshold of the first heat source Control the water source heat exchanger to act as an evaporator and shut down the air source heat exchanger; If the temperature difference threshold of the second heat source ≤ Heat source temperature difference <First heat source temperature difference threshold Control the water source heat exchanger and the air source heat exchanger to act as a series evaporator; If the heat source temperature difference <Second heat source temperature difference threshold Control the air source heat exchanger to act as an evaporator and shut down the water source heat exchanger; SA3: Continuously monitor indoor ambient temperature Determine indoor ambient temperature Is it less than or equal to the set heating temperature? Hysteresis during heating start-up Difference: If yes, return to step SA2; If not, control the compressor to stop.

3. The method for controlling the cooling and heating linkage of a coupled underfloor heating system according to claim 2, characterized in that, The air source heating mode is as follows: SC1: Obtain the frosting status of the air source heat exchanger: If the air source heat exchanger is frosted, execute the defrost mode; If there is no frost on the air source heat exchanger, proceed to step SC2; SC2: Obtain indoor ambient temperature Determine indoor ambient temperature Is it greater than or equal to the set heating temperature? Hysteresis between heating and shutdown sum: If so, shut down the compressor; In other cases, proceed to step SC3; SC3: Control the air source heat exchanger to act as an evaporator and the water working fluid heat exchanger to act as a condenser; SC4: Continuously monitor indoor ambient temperature Determine indoor ambient temperature Is it less than or equal to the set heating temperature? Hysteresis during heating start-up Difference: If yes, return to step SC3; If not, control the compressor to stop.

4. The method for controlling the cooling and heating linkage of a coupled underfloor heating system according to claim 3, characterized in that, The defrosting modes are as follows: Obtain the compressor's heating operation time and determine whether the compressor's heating operation time is greater than or equal to the compressor's maximum continuous heating operation time: If so, control the first four-way valve to switch, so that the air source heat exchanger acts as a condenser and the water working fluid heat exchanger acts as an evaporator; Continuously acquire the compressor's defrost operating time and determine whether the compressor's defrost operating time is greater than or equal to the compressor's minimum defrost operating time: If so, exit defrost mode and proceed to step SC2.

5. The method for controlling the cooling and heating linkage of a coupled underfloor heating system according to claim 1, 2, 3, or 4, characterized in that, The heating temperature difference threshold With indoor ambient temperature The following relation exists: When the indoor ambient temperature The current indoor temperature, the heating temperature difference threshold. Set to 5℃; When the indoor ambient temperature When the average ambient temperature value is collected for the second set time period t2, the heating temperature difference threshold is... Set to 3℃, where the second set time period t2 is set to 1 hour; When the indoor ambient temperature When the average ambient temperature value is collected for the third set time period t3, the heating temperature difference threshold is... Set to 1℃, where the third time period t3 is set to 24 hours.

6. The method for controlling the cooling and heating linkage of a coupled underfloor heating system according to claim 1, characterized in that, The cooling control includes: SD1: Obtain indoor ambient temperature Determine indoor ambient temperature Is it less than or equal to the set cooling temperature? Hysteresis with refrigeration shutdown Difference: If so, shut down the compressor; In other cases, proceed to step SD2; SD2: Controls the air source heat exchanger to act as the condenser and the water-based water heater to act as the evaporator; SD3: Continuously acquire indoor ambient temperature Determine indoor ambient temperature Is it greater than or equal to the set cooling temperature? Hysteresis during cooling start sum: If yes, return to step SD2; If not, control the compressor to stop.

7. The method for controlling the cooling and heating linkage of a coupled underfloor heating system according to claim 6, characterized in that, The cooling temperature difference threshold With indoor ambient temperature The following relation exists: When the indoor ambient temperature The current indoor temperature, and the cooling temperature difference threshold. Set to 5℃; When the indoor ambient temperature When the average ambient temperature value is collected for the fourth set time period t4, the cooling temperature difference threshold is... Set to 3℃, where the fourth time period t4 is set to 1 hour; When the indoor ambient temperature When the average ambient temperature value collected during the fifth set time period t5 is used, the cooling temperature difference threshold is... Set to 1℃, where the fifth time period t5 is set to 24 hours.

8. The method for controlling the cooling and heating linkage of a coupled underfloor heating system according to claim 1, characterized in that, It also includes step S1: Obtain the operating mode of the coupled underfloor heating system: If it is in heating mode, calculate the heating start-up threshold. With indoor ambient temperature Heating temperature difference ; If in cooling mode, calculate the indoor ambient temperature. With cooling start threshold Refrigeration temperature difference .

9. The method for controlling the cooling and heating linkage of a coupled underfloor heating system according to claim 8, characterized in that, The operating mode of the coupled underfloor heating system is determined by the following method: Obtain indoor ambient temperature : If the indoor ambient temperature Less than the heating start-up threshold The coupled underfloor heating system determines that the working mode is heating mode; If the indoor ambient temperature Greater than the cooling start-up threshold The coupled underfloor heating system determines that the working mode is cooling mode; In other cases, the coupled underfloor heating system decides to standby.

10. A coupled underfloor heating system, characterized in that, The system includes a compressor, a first four-way valve, a water-based heat exchanger, an electronic expansion valve, and a second four-way valve, which are connected sequentially via refrigerant piping. A water source heat exchanger, an air source heat exchanger, and a third four-way valve are connected to other working ports of the second four-way valve, respectively. The other working ports of the third four-way valve are also connected to another refrigerant port of the water source heat exchanger and the air source heat exchanger, and are connected to the first four-way valve. The system also includes a temperature detection unit and a controller electrically and / or communicatively connected to the compressor, the first four-way valve, the second four-way valve, the third four-way valve, and the temperature detection unit. The controller implements the coupled underfloor heating system cooling and heating linkage control method as described in any one of claims 1 to 9.

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