Air conditioning floor heating system and control method thereof

Abstract

The application discloses an air-conditioning floor heating system and a control method thereof, wherein the air-conditioning floor heating system comprises a floor heating coil pipe for heating a room; an air-conditioning unit comprising a compressor, an evaporator, a throttling device and a condenser connected in sequence, the condenser is in heat exchange with a water inlet pipe of the floor heating coil pipe to supply heat for the floor heating coil pipe; a bypass pipeline is arranged in parallel with the condenser and is used for bypassing part of refrigerant discharged by the compressor; and a heat storage water tank, the bypass pipeline passes through the heat storage water tank and is used for heating water in the heat storage water tank, the water in the heat storage water tank is in heat exchange with the water inlet pipe of the floor heating coil pipe to heat water inlet of the floor heating coil pipe. The application solves the problem of water resource waste or high energy consumption in the anti-freezing mode of the air-conditioning floor heating system in the prior art, prevents the floor heating coil pipe from being damaged due to internal water freezing expansion, improves the anti-freezing property and operation stability of the floor heating coil pipe, and achieves the effects of saving water resource and saving energy consumption.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioning underfloor heating system and its control method. Background Technology

[0002] An integrated air conditioning and floor heating system exchanges heat with the outdoor air through a refrigerant system, and then exchanges heat with water in a shell-and-tube heat exchanger or other types of heat exchangers to obtain high-temperature water, which is then pumped into the room for heating.

[0003] Air conditioning underfloor heating systems have numerous heating coils and long water pipes within the room. In winter, due to low ambient temperatures, the water pipes and indoor heat exchangers can freeze when the unit is off or in standby mode. In such cases, integrated air conditioning underfloor heating systems might activate the water pump and compressor for heating to prevent freezing and cracking, but this method wastes a significant amount of water. Many integrated air conditioning underfloor heating systems lack automatic antifreeze functionality, instead using a drain valve at the lowest point of the water line, with instructions reminding users to drain the water when not in use for extended periods. This method requires manual intervention and is not intelligent. Some systems simply determine the water temperature, activating auxiliary electric heating and the compressor when it falls below a certain value, and deactivating them when it rises above a certain value. This method consumes a lot of energy to maintain the water temperature and is not energy-efficient.

[0004] There is currently no effective solution to the problem of water waste or high energy consumption in the antifreeze methods of air conditioning and floor heating systems in related technologies. Summary of the Invention

[0005] This invention provides an air-conditioning underfloor heating system and its control method, which at least solves the problems of water waste or high energy consumption in the anti-freezing methods of existing air-conditioning underfloor heating systems.

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, an air conditioning and floor heating system is provided, comprising: a floor heating coil for providing indoor heating; an air conditioning unit including a compressor, an evaporator, a throttling device, and a condenser connected in sequence, wherein the condenser exchanges heat with the inlet pipe of the floor heating coil to provide heat to the floor heating coil; a bypass pipe connected in parallel with the condenser for bypassing a portion of the refrigerant discharged by the compressor; and a hot water storage tank, wherein the bypass pipe passes through the hot water storage tank for heating the water in the hot water storage tank, wherein the water in the hot water storage tank exchanges heat with the inlet pipe of the floor heating coil to heat the inlet water of the floor heating coil.

[0007] Furthermore, the hot water storage tank includes an inlet pipe and an outlet pipe. The inlet pipe of the underfloor heating coil is a sleeve structure, which includes an inner pipe located in the inner layer and an outer pipe located in the outer layer. Water that has exchanged heat with the condenser flows in the inner pipe. The outer pipe is connected to the inlet pipe and the outlet pipe of the hot water storage tank, and water from the hot water storage tank flows in the outer pipe.

[0008] Furthermore, it also includes: a heating device located on the inlet pipe of the underfloor heating coil for heating the inlet water of the underfloor heating coil; and a water pump located on the inlet pipe of the underfloor heating coil for regulating the water flow rate of the inlet water of the underfloor heating coil.

[0009] Furthermore, the hot water storage tank is also used to provide domestic hot water; the air conditioning floor heating system also includes: an ambient temperature sensor for detecting the indoor ambient temperature where the floor heating coil is located; an inlet water temperature sensor, installed on the inlet pipe of the floor heating coil, for detecting the inlet water temperature of the floor heating coil; the air conditioning floor heating system is also used to perform anti-freezing protection based on the indoor ambient temperature and the inlet water temperature of the floor heating coil.

[0010] According to another aspect of the present invention, a control method for an air conditioning underfloor heating system is provided, applied to the air conditioning underfloor heating system as described above. The method includes: detecting whether the underfloor heating coil needs to be activated for antifreeze protection; when antifreeze protection needs to be activated, acquiring the indoor ambient temperature where the underfloor heating coil is located and the inlet water temperature of the underfloor heating coil; determining the protection level of the antifreeze protection based on the indoor ambient temperature and the inlet water temperature; and controlling the operation of the air conditioning underfloor heating system according to the protection level of the antifreeze protection.

[0011] Furthermore, the step of detecting whether the underfloor heating coil needs to be protected against freezing includes: acquiring the indoor ambient temperature; determining whether the indoor ambient temperature is less than or equal to a preset antifreeze temperature threshold; if so, determining that antifreeze protection needs to be activated; otherwise, determining that antifreeze protection does not need to be activated.

[0012] Further, determining the antifreeze protection level based on the indoor ambient temperature and the inlet water temperature includes: when the indoor ambient temperature is within a first preset temperature range, determining the antifreeze protection level as a first protection level range, and within the first protection level range, determining the antifreeze protection level based on the inlet water temperature; when the indoor ambient temperature is within a second preset temperature range, determining the antifreeze protection level as a second protection level range, and within the second protection level range, determining the antifreeze protection level based on the inlet water temperature; wherein, the first preset temperature range is greater than the second preset temperature range, and the first protection level range is greater than the second protection level range.

[0013] Further, the anti-freeze protection level includes at least: a first protection level, a second protection level, and a third protection level, wherein the first protection level range includes the first protection level, the second protection level, and the third protection level, and the second protection level range includes the second protection level and the third protection level; determining the anti-freeze protection level based on the inlet water temperature includes: determining the anti-freeze protection level as the first protection level when the inlet water temperature is within a first inlet water temperature range; determining the anti-freeze protection level as the second protection level when the inlet water temperature is within a second inlet water temperature range; and determining the anti-freeze protection level as the third protection level when the inlet water temperature is within a third inlet water temperature range; wherein the first inlet water temperature range is greater than the second inlet water temperature range, and the second inlet water temperature range is greater than the third inlet water temperature range.

[0014] Furthermore, controlling the operation of the air conditioning and floor heating system according to the protection level of the antifreeze protection includes: when the protection level of the antifreeze protection is the first protection level, controlling the water pump to start, increasing the water flow rate of the floor heating coil; when the protection level of the antifreeze protection is the second protection level, controlling the heating device to start, heating the water inlet of the floor heating coil; when the protection level of the antifreeze protection is the third protection level, controlling the compressor of the air conditioning unit to start, and after the water temperature in the hot water storage tank reaches the preset temperature, exchanging heat with the water inlet pipe of the floor heating coil to heat the water inlet of the floor heating coil.

[0015] According to another aspect of the present invention, a storage medium containing computer-executable instructions is provided, which, when executed by a computer processor, are used to perform the air conditioning and floor heating system control method described above.

[0016] This invention provides an air-conditioning underfloor heating system. The system includes an air conditioning unit that supplies heat to the underfloor heating coils. The condenser of the air conditioning unit exchanges heat with the inlet pipe of the underfloor heating coils to supply heat. The system also includes a bypass pipe connected in parallel with the condenser, bypassing a portion of the refrigerant discharged from the compressor. The bypass pipe passes through a hot water storage tank, heating the water in the tank. This water then exchanges heat with the inlet pipe of the underfloor heating coils, heating the incoming water. Through the cooperation of the air conditioning unit, bypass pipe, and hot water storage tank, hot water can be stored in the tank for heat exchange with the underfloor heating coils. This avoids water waste caused by releasing water from the coils when the temperature is low. Furthermore, the system utilizes the condenser's heat dissipation for heating, fully utilizing the refrigerant's heat to provide stable hot water temperatures. This avoids the high energy consumption problem of existing air-conditioning underfloor heating systems' anti-freezing methods, prevents damage to the pipes due to internal water freezing and expansion, improves the underfloor heating coils' freeze resistance and operational stability, and simultaneously achieves water and energy savings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an optional structure of an air conditioning and floor heating system according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of an optional structure of the water inlet pipe of the underfloor heating coil according to an embodiment of the present invention;

[0019] Figure 3 This is an optional flowchart of an air conditioning and floor heating system control method according to an embodiment of the present invention;

[0020] Figure 4 This is another optional flowchart of the air conditioning and floor heating system control method according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Compressor; 2. Evaporator; 3. Throttling device; 4. Condenser; 5. Bypass pipe; 6. Hot water storage tank; 7. Four-way valve; 8. Underfloor heating coil; 9. Heating device; 10. Water pump; 11. Water pump switch; 12. Expansion tank; 13. Gas-liquid separator; 14. Subcooler; 15. Oil separator; 16. Oil return solenoid valve; 17. Oil return capillary tube; 18. Filter; 19. High pressure sensor; 20. Low pressure sensor; 21. Inner pipe; 22. Outer pipe. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0024] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0025] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0026] It should be understood that although the terms first, second, third, etc., may be used to describe controllers in embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish controllers connected to different devices. For example, without departing from the scope of embodiments of the present invention, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller.

[0027] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0028] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0029] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0030] Example 1

[0031] In a preferred embodiment 1 of the present invention, an air conditioning and underfloor heating system is provided. Specifically... Figure 1 This diagram illustrates one possible structural design of the air conditioning and underfloor heating system, such as... Figure 1 As shown, the air conditioning and underfloor heating system includes:

[0032] The underfloor heating coil 8 is used to heat the room. Water flows inside the underfloor heating coil 8 as a heat exchange medium, which is not only low-cost but also pollution-free. In addition, other media can be used as heat exchange media, such as antifreeze. As long as it is a liquid medium, the system of this invention can be used. The following description uses water as the heat exchange medium.

[0033] The air conditioning unit includes a compressor 1, an evaporator 2, a throttling device 3, and a condenser 4 connected in sequence. The condenser 4 exchanges heat with the inlet pipe of the underfloor heating coil 8 to supply heat to the underfloor heating coil 8. The air conditioning unit can be used to provide heating for users, and can also be used for underfloor heating when needed, thus expanding the application range of the air conditioning unit. Utilizing the waste heat of the condenser 4 to heat the underfloor heating improves energy utilization and also increases the heat exchange efficiency of the air conditioning unit. Furthermore, such as... Figure 1 As shown, the air conditioning unit also includes: a gas-liquid separator 13, a subcooler 14, an oil separator 15, an oil return solenoid valve 16, an oil return capillary tube 17, and a filter 18. Additionally, a high-pressure sensor 19 and a low-pressure sensor 20 are provided to detect system pressure and control the operation of the air conditioning unit.

[0034] Bypass pipe 5, connected in parallel with condenser 4, is used to bypass part of the refrigerant discharged from compressor 1; such as Figure 1 As shown, one end of the bypass pipe 5 is connected to the four-way valve 7, and the other end is connected to the throttling device 3. Other connection point settings can also be used to achieve heating by using the heat from the high-temperature refrigerant discharged by the compressor 1.

[0035] A hot water storage tank 6 has a bypass pipe 5 passing through it, used to heat the water inside. The water in the hot water storage tank 6 exchanges heat with the inlet pipe of the underfloor heating coil 8, heating the inlet water of the underfloor heating coil 8. The hot water storage tank 6 is also used to provide domestic hot water, expanding its uses and improving the economic efficiency of the entire system.

[0036] In the above embodiments, an air-conditioning underfloor heating system is provided. This system includes an air conditioning unit that supplies heat to the underfloor heating coils. The condenser of the air conditioning unit exchanges heat with the inlet pipe of the underfloor heating coils to supply heat. The air-conditioning underfloor heating system also includes a bypass pipe connected in parallel with the condenser, bypassing a portion of the refrigerant discharged from the compressor. The bypass pipe passes through a hot water storage tank, heating the water in the tank. The water in the hot water storage tank then exchanges heat with the inlet pipe of the underfloor heating coils, heating the inlet water. Through the cooperation of the air conditioning unit, the bypass pipe, and the hot water storage tank, hot water can be stored in the storage tank for heat exchange with the underfloor heating coils. This avoids water waste caused by releasing water from the underfloor heating coils when the temperature is low. Furthermore, the system utilizes the condenser's heat dissipation for heating, fully utilizing the refrigerant's heat to provide stable-temperature hot water. This avoids the high energy consumption problem of existing air-conditioning underfloor heating systems' anti-freezing methods, prevents damage to the pipes due to internal water freezing and expansion in the underfloor heating coils, improves the underfloor heating coils' freeze resistance and operational stability, and simultaneously achieves the effects of saving water resources and energy.

[0037] like Figure 1 As shown, the hot water storage tank 6 includes an inlet pipe and an outlet pipe. A heat exchanger can also be installed inside the hot water storage tank 6. A bypass pipe 5 is connected to the water pipe inside the heat exchanger. One end of the water pipe inside the hot water storage tank 6 is connected to the outlet pipe, which enters the underfloor heating coil 8. The outlet pipe is also equipped with a solenoid valve to control the opening and closing of the outlet pipe and the water flow.

[0038] Figure 2 The diagram illustrates an optional structure for the inlet pipe of the underfloor heating coil 8. The inlet pipe is a sleeve structure, comprising an inner pipe 21 and an outer pipe 22. Water that has exchanged heat with the condenser 4 flows through the inner pipe. The outer pipe is connected to the inlet and outlet pipes of the hot water storage tank 6, and water from the tank 6 flows through it. The water in the tank and the underfloor heating module stores water for heat exchange. The resulting hot water is injected into the antifreeze sleeve when the underfloor heating module's antifreeze protection is activated, preventing damage to the underfloor heating coil 8 due to internal water freezing and expansion during low winter temperatures.

[0039] In addition, the air conditioning and underfloor heating system also includes: a heating device 9, located on the inlet pipe of the underfloor heating coil 8, used to heat the inlet water of the underfloor heating coil 8; and a water pump 10, located on the inlet pipe of the underfloor heating coil 8, used to regulate the water flow rate of the underfloor heating coil 8. The water pump 10 is equipped with a water pump switch 11 to regulate the inlet water flow rate, preventing excessive water accumulation in the pipes and thus protecting the unit from freezing and rupturing the pipe walls. A higher water flow rate also allows for faster heat exchange, thereby improving the heating effect of the underfloor heating coil 8. An expansion tank 12 can also be installed to buffer the pressure within the pipes. The heating device 9 can be an electric heating device 9 or other heating devices 9, used to heat the inlet water of the underfloor heating coil 8 to increase the inlet water temperature and prevent the underfloor heating coil water temperature from becoming too low in low-temperature environments. The aforementioned water pump 10, heating device 9, and air conditioning unit constitute multiple anti-freeze protection measures, which can be gradually activated as needed to achieve multiple anti-freeze protections.

[0040] The air conditioning underfloor heating system also includes: an ambient temperature sensor to detect the indoor ambient temperature where the underfloor heating coils are located; an inlet water temperature sensor, installed on the inlet pipe of the underfloor heating coils, to detect the inlet water temperature of the underfloor heating coils; the air conditioning underfloor heating system also provides anti-freezing protection based on the indoor ambient temperature and the inlet water temperature of the underfloor heating coils.

[0041] The multi-layer antifreeze design adopted in this invention can completely solve the problem of water system freezing in low-temperature environments when the air conditioning and floor heating integrated unit is in standby, shutdown or fault state, thereby ensuring the reliability of the unit and improving its service life.

[0042] Example 2

[0043] In a preferred embodiment 2 of the present invention, a control method for an air conditioning and floor heating system is provided, which is applied to the air conditioning and floor heating system in embodiment 1 above. Specifically, Figure 3 An optional flowchart of the method is shown, such as Figure 3 As shown, the method includes the following steps S302-S306:

[0044] S302: Check whether the underfloor heating coils need to have their antifreeze protection activated;

[0045] S304: When antifreeze protection needs to be activated, obtain the indoor ambient temperature where the underfloor heating coil is located and the inlet water temperature of the underfloor heating coil.

[0046] S306: Determine the antifreeze protection level based on the indoor ambient temperature and inlet water temperature, and control the operation of the air conditioning and underfloor heating system according to the antifreeze protection level.

[0047] In the above embodiments, an air-conditioning underfloor heating system is provided. This system includes an air conditioning unit that supplies heat to the underfloor heating coils. The condenser of the air conditioning unit exchanges heat with the inlet pipe of the underfloor heating coils to supply heat. The air-conditioning underfloor heating system also includes a bypass pipe connected in parallel with the condenser, bypassing a portion of the refrigerant discharged from the compressor. The bypass pipe passes through a hot water storage tank, heating the water in the tank. The water in the hot water storage tank then exchanges heat with the inlet pipe of the underfloor heating coils, heating the inlet water. Through the cooperation of the air conditioning unit, the bypass pipe, and the hot water storage tank, hot water can be stored in the storage tank for heat exchange with the underfloor heating coils. This avoids water waste caused by releasing water from the underfloor heating coils when the temperature is low. Furthermore, the system utilizes the condenser's heat dissipation for heating, fully utilizing the refrigerant's heat to provide stable-temperature hot water. This avoids the high energy consumption problem of existing air-conditioning underfloor heating systems' anti-freezing methods, prevents damage to the pipes due to internal water freezing and expansion in the underfloor heating coils, improves the underfloor heating coils' freeze resistance and operational stability, and simultaneously achieves the effects of saving water resources and energy.

[0048] In a preferred embodiment of the present invention, detecting whether the underfloor heating coil needs to activate antifreeze protection includes: acquiring the indoor ambient temperature; determining whether the indoor ambient temperature is less than or equal to a preset antifreeze temperature threshold; if so, determining that antifreeze protection needs to be activated; otherwise, determining that antifreeze protection does not need to be activated. If the indoor ambient temperature is less than or equal to the preset antifreeze temperature threshold, it indicates that the indoor ambient temperature is low, and antifreeze protection should be activated promptly to prevent water in the underfloor heating coil from freezing and expanding, causing damage to the pipes.

[0049] After determining that antifreeze protection needs to be activated, the protection level of the antifreeze protection is determined based on the indoor ambient temperature and the inlet water temperature. This includes: when the indoor ambient temperature is within a first preset temperature range, the protection level of the antifreeze protection is determined to be a first protection level range, and within the first protection level range, the protection level of the antifreeze protection is determined based on the inlet water temperature; when the indoor ambient temperature is within a second preset temperature range, the protection level of the antifreeze protection is determined to be a second protection level range, and within the second protection level range, the protection level of the antifreeze protection is determined based on the inlet water temperature. The first preset temperature range is greater than the second preset temperature range, and the first protection level range is greater than the second protection level range. Because the air conditioning and underfloor heating system of this invention is equipped with multiple antifreeze protection devices, multiple antifreeze protection levels can be set. Different levels correspond to different antifreeze protection effects, thus achieving different protection effects under different ambient temperatures. This adapts to the ambient temperature, resulting in a higher degree of intelligence and energy saving, avoiding unnecessary resource waste.

[0050] The anti-freeze protection level includes at least three levels: first protection level, second protection level, and third protection level. The first protection level range includes the first protection level, the second protection level, and the third protection level, and the second protection level range includes the second protection level and the third protection level. Since the first preset temperature range is greater than the second preset temperature range, when the ambient temperature is low in the second preset temperature range, the higher level of anti-freeze protection is directly implemented, resulting in more precise control.

[0051] Specifically, the anti-freeze protection level is determined based on the inlet water temperature, including: when the inlet water temperature is within a first inlet water temperature range, the anti-freeze protection level is determined as the first protection level; when the inlet water temperature is within a second inlet water temperature range, the anti-freeze protection level is determined as the second protection level; and when the inlet water temperature is within a third inlet water temperature range, the anti-freeze protection level is determined as the third protection level. The first inlet water temperature range is greater than the second inlet water temperature range, and the second inlet water temperature range is greater than the third inlet water temperature range. That is, within each protection level range, the specific anti-freeze protection level is determined using the inlet water temperature. The inlet water temperature more directly reflects the condition of the underfloor heating coils; therefore, determining the specific anti-freeze protection level based on the inlet water temperature can improve the accuracy of control.

[0052] After determining the protection level, the operation of the air conditioning and underfloor heating system is controlled according to the anti-freeze protection level. This includes: when the anti-freeze protection level is Level 1, controlling the water pump to start increases the water flow into the underfloor heating coils; when the anti-freeze protection level is Level 2, controlling the heating device to start heats the water entering the underfloor heating coils; and when the anti-freeze protection level is Level 3, controlling the air conditioning unit's compressor to start, and after the water temperature in the hot water storage tank reaches the preset temperature, exchanging heat with the water entering the underfloor heating coils to heat the water. The higher the anti-freeze protection level, the better the heating effect. Therefore, the protection level can also be set in other ways as needed, such as activating more devices with higher protection levels to quickly improve the heating effect and prevent freezing.

[0053] In a preferred embodiment 2 of the present invention, another method for controlling an air conditioning and underfloor heating system is also provided. Specifically... Figure 4 An optional flowchart of the method is shown, such as Figure 4 As shown, the method includes the following steps S401-S419:

[0054] S401: Start;

[0055] S402: Detect ambient temperature;

[0056] S403: Detects water temperature; after confirming that the underfloor heating is in standby / off state, it acquires the ambient temperature and the inlet water temperature of the underfloor heating module;

[0057] S404: Is the condition that ambient temperature ≤ T0 true? If yes, proceed to step S406; otherwise, proceed to step S405.

[0058] S405: Antifreeze protection is not activated;

[0059] S406: Activate antifreeze protection;

[0060] S407: Is T1≤AmbientTemperature≤T0 true? If yes, proceed to step S408; otherwise, proceed to step S411. When the ambient temperature is determined to be less than the preset antifreeze ambient temperature T0, the system determines to enter the antifreeze protection program.

[0061] S408: Activate the first level of antifreeze protection;

[0062] S409: Is the condition T3 < inlet water temperature ≤ T2 true? If yes, proceed to step S410; otherwise, proceed to step S412.

[0063] S410: The water pump is turned on to increase the water flow. When the ambient temperature is higher than the preset antifreeze ambient temperature T1 and the underfloor heating inlet water temperature is lower than T2, the water pump is turned on to increase the flow rate to prevent freezing as the first level of antifreeze protection. By increasing the water flow in the pipeline, a large amount of water accumulation in the pipeline is avoided, thus protecting the unit from bursting the pipe wall due to freezing caused by a large amount of water accumulation.

[0064] S411: Is the condition that ambient temperature ≤ T1 true? If yes, proceed to step S412.

[0065] S412: Is the condition T4 < inlet water temperature ≤ T3 true? If yes, proceed to step S413; otherwise, proceed to step S415.

[0066] S413: Activate the second level of antifreeze protection;

[0067] S414: Turn on the electric heating belt; when the inlet water temperature is less than T3, turn on the electric heating belt wrapped around the inlet water circuit as a second-level antifreeze protection, and prevent the water circuit from freezing by heating the inlet water section pipe.

[0068] S415: Is the condition T5 < inlet water temperature ≤ T4 true? If yes, proceed to step S416.

[0069] S416: Activate Level 3 antifreeze protection;

[0070] S417: The compressor is in heating operation, and the hot water storage tank control valve is open. When the inlet water temperature is less than T4, the compressor starts to enter heating operation. The hot water storage tank control valve opens after the water temperature in the tank reaches a certain level. At this time, the heating effect of the electric heating device on the pipeline is insufficient to offset the impact of a large amount of low-temperature water entering the system on the pipeline. Hot water is added to the antifreeze sleeve of the inlet water circuit as a third-level antifreeze protection to further protect the pipeline from freezing.

[0071] S418: After running for 5 minutes, check if the inlet and outlet water temperatures are ≥15℃. If yes, proceed to step S419; otherwise, proceed to step S402.

[0072] S419: Exit antifreeze operation.

[0073] Among them, T0: the preset ambient temperature judgment value for starting the first, second and third levels of antifreeze, with a value of 0 to 10°C, preferably 0°C;

[0074] T1: The preset ambient temperature for initiating the second and third levels of antifreeze, with a range of -10 to 0°C, preferably -7°C;

[0075] T2: The preset water temperature judgment value for starting the water pump under the first-stage antifreeze protection, which is 7 to 10°C, preferably 8°C;

[0076] T3: The preset water temperature judgment value for the second-stage antifreeze protection to start the heating device, which is 5-8°C, preferably 6°C;

[0077] T4: The preset water temperature judgment value for the second-stage antifreeze protection to start the heating device, which is 4 to 6°C, preferably 4°C;

[0078] T5: The preset water temperature judgment value for starting the compressor and hot water storage tank control valve under the third-level antifreeze protection, with a value of 0 to 4°C, preferably 3°C.

[0079] The three-stage antifreeze design adopted in this invention can completely solve the problem of water system freezing in low-temperature environments when the air conditioning and floor heating integrated unit is in standby, shutdown or fault state, thereby ensuring the reliability of the unit and improving its service life.

[0080] Example 3

[0081] Based on the air conditioning and floor heating system control method provided in Embodiment 2 above, in the preferred embodiment 3 of the present invention, a storage medium containing computer-executable instructions is also provided. When the computer-executable instructions are executed by a computer processor, they are used to execute the air conditioning and floor heating system control method as described above.

[0082] In the above embodiments, an air-conditioning underfloor heating system is provided. This system includes an air conditioning unit that supplies heat to the underfloor heating coils. The condenser of the air conditioning unit exchanges heat with the inlet pipe of the underfloor heating coils to supply heat. The air-conditioning underfloor heating system also includes a bypass pipe connected in parallel with the condenser, bypassing a portion of the refrigerant discharged from the compressor. The bypass pipe passes through a hot water storage tank, heating the water in the tank. The water in the hot water storage tank then exchanges heat with the inlet pipe of the underfloor heating coils, heating the inlet water. Through the cooperation of the air conditioning unit, the bypass pipe, and the hot water storage tank, hot water can be stored in the storage tank for heat exchange with the underfloor heating coils. This avoids water waste caused by releasing water from the underfloor heating coils when the temperature is low. Furthermore, the system utilizes the condenser's heat dissipation for heating, fully utilizing the refrigerant's heat to provide stable-temperature hot water. This avoids the high energy consumption problem of existing air-conditioning underfloor heating systems' anti-freezing methods, prevents damage to the pipes due to internal water freezing and expansion in the underfloor heating coils, improves the underfloor heating coils' freeze resistance and operational stability, and simultaneously achieves the effects of saving water resources and energy.

[0083] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0084] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0085] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0086] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0087] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0088] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0089] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented by the invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0090] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. An air conditioning and underfloor heating system, characterized in that, include: Underfloor heating coils are used to provide indoor heating. An air conditioning unit includes a compressor, an evaporator, a throttling device, and a condenser connected in sequence. The condenser exchanges heat with the water inlet pipe of the underfloor heating coil to supply heat to the underfloor heating coil. A bypass line, connected in parallel with the condenser, is used to bypass a portion of the refrigerant discharged from the compressor; A hot water storage tank is provided, and the bypass pipe passes through the hot water storage tank to heat the water in the hot water storage tank. The water in the hot water storage tank exchanges heat with the inlet pipe of the underfloor heating coil to heat the inlet water of the underfloor heating coil. The hot water storage tank includes an inlet pipe and an outlet pipe. The inlet pipe of the underfloor heating coil is a sleeve structure, which includes an inner pipe located in the inner layer and an outer pipe located in the outer layer. Water before heat exchange with the condenser flows in the inner pipe. The outer pipe is connected to the inlet pipe and the outlet pipe of the hot water storage tank, and water from the hot water storage tank flows in the outer pipe.

2. The air conditioning and floor heating system according to claim 1, characterized in that, Also includes: A heating device is located on the inlet pipe of the underfloor heating coil and is used to heat the inlet water of the underfloor heating coil. A water pump, located on the inlet pipe of the underfloor heating coil, is used to regulate the water flow rate into the underfloor heating coil.

3. The air conditioning and floor heating system according to claim 1, characterized in that, The hot water storage tank is also used to provide domestic hot water; the air conditioning and underfloor heating system also includes: An ambient temperature sensor is used to detect the indoor ambient temperature where the underfloor heating coil is located; An inlet water temperature sensor is installed on the inlet pipe of the underfloor heating coil to detect the inlet water temperature of the underfloor heating coil. The air conditioning and floor heating system is also used to provide anti-freezing protection based on the indoor ambient temperature and the inlet water temperature of the floor heating coil.

4. A control method for an air conditioning and underfloor heating system, applied to the air conditioning and underfloor heating system as described in claim 3, characterized in that, The method includes: Check if the underfloor heating coils need to have their antifreeze protection activated. When antifreeze protection needs to be activated, the indoor ambient temperature where the underfloor heating coil is located and the inlet water temperature of the underfloor heating coil are obtained. The antifreeze protection level is determined based on the indoor ambient temperature and the inlet water temperature, and the operation of the air conditioning and floor heating system is controlled according to the antifreeze protection level.

5. The method according to claim 4, characterized in that, The method for detecting whether the underfloor heating coils need to have their antifreeze protection activated includes: Obtain the indoor ambient temperature; Determine whether the indoor ambient temperature is less than or equal to a preset antifreeze temperature threshold; If yes, then you need to enable anti-freeze protection; otherwise, you need not enable anti-freeze protection.

6. The method according to claim 4, characterized in that, The level of antifreeze protection is determined based on the indoor ambient temperature and the inlet water temperature, including: When the indoor ambient temperature is within a first preset temperature range, the protection level of the antifreeze protection is determined to be the first protection level range, and the protection level of the antifreeze protection is determined according to the inlet water temperature within the first protection level range. When the indoor ambient temperature is within the second preset temperature range, the protection level of the antifreeze protection is determined to be the second protection level range. Within the second protection level range, the protection level of the antifreeze protection is determined based on the inlet water temperature. Wherein, the first preset temperature range is greater than the second preset temperature range, and the first protection level range is greater than the second protection level range.

7. The method according to claim 6, characterized in that, The antifreeze protection level includes at least: a first protection level, a second protection level, and a third protection level, wherein the first protection level ranges from the first protection level, the second protection level, and the third protection level, and the second protection level ranges from the second protection level and the third protection level; determining the antifreeze protection level based on the inlet water temperature includes: When the inlet water temperature is within the first inlet water temperature range, the protection level of the antifreeze protection is determined to be the first protection level; When the inlet water temperature is within the second inlet water temperature range, the protection level of the antifreeze protection is determined to be the second protection level; When the inlet water temperature is within the third inlet water temperature range, the protection level of the antifreeze protection is determined to be the third protection level; wherein, the first inlet water temperature range is greater than the second inlet water temperature range, and the second inlet water temperature range is greater than the third inlet water temperature range.

8. The method according to claim 7, characterized in that, Controlling the operation of the air conditioning and underfloor heating system according to the aforementioned anti-freeze protection level includes: When the antifreeze protection level is the first protection level, the water pump is turned on to increase the water flow rate into the underfloor heating coil. When the antifreeze protection level is the second protection level, the heating device is turned on to heat the inlet water of the floor heating coil; When the antifreeze protection level is the third protection level, the compressor of the air conditioning unit is controlled to start. After the water temperature in the hot water storage tank reaches the preset temperature, heat exchange occurs between the water and the inlet pipe of the floor heating coil to heat the inlet water of the floor heating coil.

9. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the air conditioning and floor heating system control method as described in any one of claims 4 to 8.

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