Floor heating system

Abstract

The utility model discloses a floor heating system which comprises a heating circulation loop, a refrigerating unit, a ventilation pipe and a first fan, the refrigerating unit supplies heat to the heating circulation loop through an intermediate heat exchanger, the heating circulation loop is provided with a heating pipe connected to the outlet side of the intermediate heat exchanger, and the ventilation pipe is embedded in a floor. The first draught fan drives air to flow through the heating pipe to be fed into the ventilation pipe. The intermediate heat exchanger comprises a first heat exchange pipe and a second heat exchange pipe which exchange heat with each other, the first heat exchange pipe is connected into the heating circulation loop, and the second heat exchange pipe is connected into the refrigerating unit; the heating pipe is connected to the outlet side of the first heat exchange pipe, and the second heat exchange pipe is connected to the exhaust side of a compressor of the refrigerating unit. According to the utility model, heat of the refrigerating unit is recycled and supplied to the floor for heating in winter, so that on one hand, energy utilization can be realized, atmospheric thermal pollution can be avoided, and on the other hand, additional heating energy consumption for floor heating can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heating systems, in particular to a floor heating system. Background Art

[0002] As a low-temperature storage facility, the operating efficiency and stability of a cold storage are directly related to the quality and safety of stored items. The design of a cold storage needs to ensure that the internal environment is maintained at a low temperature or even an ultra-low temperature all year round to inhibit the reproduction of microorganisms and delay the spoilage of food. However, this extreme temperature condition poses a severe challenge to the stability of the cold storage structure, especially the cold storage floor and the underground soil in contact with it.

[0003] Although traditional cold storages are provided with heat insulation layers with a thickness adapted to the storage temperature, they can only reduce the heat transfer. To prevent the damage of the cold storage floor or the upper structure caused by the freezing of the underground soil, the floor needs to be designed for frost protection. The existing floor heating solutions mainly include installing heat source (heating resistance wire, ethylene glycol) devices for frost protection, elevated floors for frost protection, and floor ventilation for frost protection.

[0004] For the installation of heat source devices, such methods include using media such as heating resistance wires or ethylene glycol as heat sources to heat the floor directly or indirectly to prevent soil freezing. Although the installation of heating resistance wire pipelines provides uniform heating, it consumes a high amount of energy, significantly increasing the long-term operation cost. At the same time, the complex wiring process and high-precision construction requirements not only prolong the construction period but also increase the difficulty and cost of later maintenance. Although the installation of ethylene glycol pipelines has higher energy efficiency, its chemical properties determine that there is a potential leakage risk. Once leaked, it will not only affect environmental safety but may also contaminate the stored items in the cold storage.

[0005] For elevated floors for frost protection, by separating the floor from the ground to form an air layer to reduce heat transfer, thereby preventing soil freezing. This method performs well in regions with mild climates, but in regions where the winter ambient temperature continuously drops below 0°C, its effect is greatly reduced because condensate is likely to form in the air layer under low-temperature environments, instead increasing the risk of structural damage.

[0006] For floor ventilation for frost protection, using natural wind or a mechanical ventilation system to form a circulating air flow under the floor to take away heat to maintain the soil temperature. This method is also limited by the ambient temperature and is not applicable to extremely cold climates.

[0007] Therefore, how to design a floor heating system with high energy efficiency and a wider application range is a technical problem that the industry urgently needs to solve. Summary of the Utility Model

[0008] In order to solve the defects of poor safety and high energy consumption in the existing technology, the utility model proposes a floor heating system to recycle the heat of the refrigeration unit and supply it for floor heating in winter. On the one hand, it can realize energy utilization and avoid atmospheric heat pollution, and on the other hand, it can reduce the additional heating energy consumption of floor heating.

[0009] The technical solution adopted by the present invention is to design a floor heating system, including: a heating circulation loop, a refrigeration unit, a ventilation pipe, and a first fan. The refrigeration unit supplies heat to the heating circulation loop through an intermediate heat exchanger. The heating circulation loop has a heating pipe connected to the outlet side of the intermediate heat exchanger. The ventilation pipe is buried in the floor. The first fan drives air to flow through the heating pipe and into the ventilation pipe.

[0010] Furthermore, the intermediate heat exchanger includes: a first heat exchange tube and a second heat exchange tube for exchanging heat with each other, the first heat exchange tube is connected to the heating circulation loop, and the second heat exchange tube is connected to the refrigeration unit; the heating tube is connected to the outlet side of the first heat exchange tube, and the second heat exchange tube is connected to the exhaust side of the compressor of the refrigeration unit.

[0011] Furthermore, the first heat exchange tube and / or the second heat exchange tube is equipped with a regulating valve for controlling flow.

[0012] Furthermore, the exhaust side of the compressor of the refrigeration unit is connected in parallel to the condenser and the second heat exchange tube via a main switching valve, and the main switching valve is used to control the flow of the refrigerant medium to the condenser and / or the second heat exchange tube.

[0013] Furthermore, the outlet of the second heat exchange tube is connected to the inlet of the condenser through a secondary switching valve, and the secondary switching valve is used to control the flow of the refrigerant medium to the condenser.

[0014] Furthermore, the heating circulation loop includes: a first heat exchange tube, a heating tube, a circulation pump and a liquid storage tank connected in sequence, and the outlet of the liquid storage tank is connected to the inlet side of the first heat exchange tube.

[0015] Furthermore, the refrigeration unit includes: a compressor, a condenser, a liquid storage device, a gas-liquid separator and an evaporator connected in sequence, the inlet of the evaporator is connected to the liquid outlet of the gas-liquid separator through a throttling device, the outlet of the evaporator is connected to the inlet of the gas-liquid separator, and the air outlet of the gas-liquid separator is connected to the suction side of the compressor.

[0016] Furthermore, the floor heating system also includes: a controller, a temperature detection device communicatively connected to the controller, the temperature detection device is used to detect the outdoor ambient temperature and / or the inlet and outlet temperatures of the intermediate heat exchanger, and the heating cycle loop and the refrigeration unit are controlled by the controller.

[0017] Furthermore, the floor heating system also includes: a liquid level sensor communicatively connected to the controller, and the liquid level sensor is installed in a liquid storage tank of the heating circulation loop.

[0018] Further, both the inlet and outlet of the ventilation pipe are connected to the outdoor environment.

[0019] Compared with the prior art, the present utility model has at least one of the following beneficial effects:

[0020] 1. Recycle the heat of the refrigeration unit. The hot air generated by the heating pipe and the first fan is supplied to the ventilation pipe buried in the floor. On the one hand, it can reduce the heat discharged into the outdoor environment and reduce the atmospheric heat pollution. On the other hand, it can reduce the additional energy consumption for floor heating, and there is no risk of chemical leakage when using the ventilation pipe for heating;

[0021] 2. The exhaust side of the compressor of the refrigeration unit can be switched to connect to the condenser and / or the intermediate heat exchanger. When the high-temperature refrigerant discharged from the compressor passes through the intermediate heat exchanger, the heating pipe is used to assist in heating the air and then sent into the ventilation pipe. When the high-temperature refrigerant discharged from the compressor does not pass through the intermediate heat exchanger, the natural wind in the outdoor environment is sent into the ventilation pipe. Floor protection is achieved through the two-way switching of floor auxiliary heating and natural wind, with a wider scope of application and lower energy consumption. Description of the Drawings

[0022] The present utility model will be described in detail below in conjunction with the embodiments and the drawings, where:

[0023] Figure 1 is a schematic structural diagram of the floor heating system of the present utility model;

[0024] Figure 2 is a schematic flow diagram of the intermediate heat exchanger of the present utility model;

[0025] Figure 3 is a schematic flow diagram of the first embodiment of the present utility model;

[0026] Figure 4 is a schematic flow diagram of the second embodiment of the present utility model;

[0027] Figure 5 is a schematic flow diagram of the third embodiment of the present utility model;

[0028] Description of the Drawings: 1. Compressor; 2. Intermediate heat exchanger; 21. First heat exchange pipe; 22. Second heat exchange pipe; 3. First fan; 4. Ventilation pipe; 5. Circulation pump; 6. Liquid storage tank; 7. Condenser; 8. Liquid receiver; 9. Gas-liquid separator; 10. Throttling device; 11. Evaporator; 12. First regulating valve; 13. Second regulating valve; 14. Main switching valve; 15. Sub-switching valve. Detailed Embodiments

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0030] As Figure 1 shown, the floor heating system proposed by the present utility model includes: a heating circulation circuit, a refrigeration unit, a ventilation pipe 4, and a first fan 3. An intermediate heat exchanger 2 is provided between the refrigeration unit and the heating circulation circuit. The heating circulation circuit has heating pipes connected to the outlet side of the intermediate heat exchanger. The ventilation pipe 4 is buried in the floor. The first fan 3 drives the air flow and sends it into the ventilation pipe 4. The heating pipes are located on the air flow path of the ventilation pipe 4.

[0031] When the refrigeration unit works, the refrigeration medium in the refrigeration unit circulates. The high-temperature gaseous refrigeration medium discharged by the compressor 1 needs to be condensed. This heat can be absorbed and utilized by the heating circulation circuit through the intermediate heat exchanger 2 and provided to the ventilation pipe 4. Specifically, when the heating medium in the heating circulation circuit flows through the intermediate heat exchanger 2, it absorbs the heat of the refrigeration unit. The heating medium sent out by the intermediate heat exchanger 2 flows to the heating pipes. The first fan 3 drives the air to flow through the heating pipes, absorbs the heat of the heating medium, and then sends it into the ventilation pipe 4 to achieve floor heating and prevent the floor from freezing and swelling.

[0032] The advantage of this design is to recycle the heat of the refrigeration unit by using the intermediate heat exchanger 2, and generate hot air through the heating pipes and the first fan 3 for use in the ventilation pipe 4 buried in the floor. On the one hand, it can reduce the heat discharged into the outdoor environment and reduce the atmospheric heat pollution. On the other hand, it can reduce the additional energy consumption for floor heating, and there is no risk of chemical leakage when using the ventilation pipe 4 for heating.

[0033] It should be understood that in actual application, the refrigeration medium and the heating medium can be selected according to specific requirements. For example, the refrigeration medium can be Freon, and the heating medium can be water. The present utility model does not make special restrictions on this.

[0034] As Figure 1 、 2As shown, specifically, the intermediate heat exchanger 2 includes a first heat exchange tube 21 and a second heat exchange tube 22 that exchange heat with each other. The first heat exchange tube 21 is connected to the heating circulation loop. Specifically, the heating tube is connected to the outlet side of the first heat exchange tube 21. The second heat exchange tube 22 is connected to the refrigeration unit. Specifically, the second heat exchange tube 22 is connected to the compressor exhaust side of the refrigeration unit. By introducing the high-temperature refrigerant on the compressor exhaust side into the second heat exchange tube 22 and performing heat exchange with the heating medium in the first heat exchange tube 21 in the intermediate heat exchanger 2, the waste heat generated during the operation of the refrigeration unit can be effectively recovered. The intermediate heat exchanger 2 plays a role in heat balance adjustment between the heating circulation loop and the refrigeration unit.

[0035] The advantage of this design is that since the gas temperature on the compressor exhaust side is relatively high, using it as a heat source to heat the heating medium in the first heat exchange tube 21 can significantly improve the heating efficiency. In addition, the intermediate heat exchanger 2 can share the condensation load of the condenser 7, improve the energy efficiency of the refrigeration unit, and save water consumption when the refrigeration unit uses a water-cooled condenser, which has a significant effect on system energy conservation and low-carbon operation.

[0036] It should be noted that in order to improve the flexibility of heat transfer amount adjustment, a regulating valve for controlling the flow rate can be installed in the first heat exchange tube 21 or the second heat exchange tube 22. In a preferred solution, a first regulating valve 12 is installed in the first heat exchange tube 21, and a second regulating valve 13 is installed in the second heat exchange tube 22. The flow rates of the refrigerant and the heating medium flowing in the intermediate heat exchanger 2 are controlled by these regulating valves to accurately regulate the heat supplied to the floor.

[0037] As Figure 1 shown, in some feasible embodiments of the present invention, the compressor exhaust side of the refrigeration unit is connected in parallel to the condenser 7 and the second heat exchange tube 22 through a main switching valve 14. The main switching valve 14 is used to control the flow direction of the refrigerant to the condenser 7 and / or the second heat exchange tube 22. Specifically, the main switching valve 14 can adopt a three-way valve. The first port A1 of the main switching valve 14 is connected to the exhaust port of the compressor 1, the second port A2 of the main switching valve 14 is connected to the inlet of the second heat exchange tube 22, and the third port A3 of the main switching valve 14 is connected to the inlet of the condenser 7. The main switching valve 14 controls the on / off state of each port to make the refrigerant flow to the condenser 7 and / or the second heat exchange tube 22. The advantage of this design is that the flow direction of the refrigerant of the refrigeration unit can be flexibly switched according to actual usage requirements, improving the applicable range of the floor heating system.

[0038] Specifically, as Figure 3 shown, the refrigerant discharged from the compressor 1 can only flow to the condenser 7. At this time, the high-temperature refrigerant does not pass through the intermediate heat exchanger 2, preventing the intermediate heat exchanger 2 from dry burning when the heating circulation loop stops operating. As Figure 4As shown in the figure, the refrigerant discharged from the compressor 1 can partially flow to the intermediate heat exchanger 2 and the other part can flow to the condenser 7. At this time, the intermediate heat exchanger 2 is working and the flow rate is adjustable. The flow rate of the refrigerant flowing to the intermediate heat exchanger 2 is adjusted according to the heating demand of the floor. As Figure 5 shown in the figure, the refrigerant discharged from the compressor 1 can all flow to the intermediate heat exchanger 2. At this time, the intermediate heat exchanger 2 is working and has efficient heat exchange.

[0039] As Figure 1 shown in the figure, on the basis of the main switching valve 14, the preferred solution is to add a secondary switching valve 15. The outlet of the second heat exchange tube 22 is connected to the inlet of the condenser 7 through the secondary switching valve 15. The secondary switching valve 15 is used to control the flow direction of the refrigerant to the condenser 7. When the secondary switching valve 15 connects the outlet of the second heat exchange tube 22 and the inlet of the condenser 7, the refrigerant flowing out of the second heat exchange tube 22 flows to the condenser 7. When the secondary switching valve 15 closes the outlet of the second heat exchange tube 22 and the inlet of the condenser 7, the second heat exchange tube 22 is shut off, and all the refrigerant discharged from the compressor 1 flows to the condenser 7.

[0040] Specifically, the secondary switching valve 15 can adopt a three-way valve. The first port B1 of the secondary switching valve 15 is connected to the third port A3 of the main switching valve 14. The second port B2 of the secondary switching valve 15 is connected to the inlet of the condenser 7. The third port B3 of the secondary switching valve 15 is connected to the outlet of the second heat exchange tube 22. The secondary switching valve 15 controls the on-off state of each port so that the refrigerant flowing out of the compressor 1 and / or the second heat exchange tube 22 is sent to the condenser 7.

[0041] The advantage of this design is that the refrigerant first passes through the intermediate heat exchanger 2 for heat recovery, and then the refrigerant that has undergone primary condensation is sent to the condenser 7 for secondary condensation, which can more effectively utilize the exhaust heat of the compressor 1 and optimize the condensation efficiency. In addition, the pipeline connection state between the compressor 1, the intermediate heat exchanger 2 and the condenser 7 is jointly controlled by the main switching valve 14 and the secondary switching valve 15, which can more accurately control the flow direction of the refrigerant and improve the system reliability.

[0042] As shown in the figure, in some feasible embodiments of the present invention, the heating circulation loop includes: a first heat exchange tube 21, a heating tube, a circulation pump 5 and a liquid storage tank 6 connected in sequence. The outlet of the liquid storage tank 6 is connected to the inlet side of the first heat exchange tube 21. When the heating circulation loop operates, the heating medium flowing out of the liquid storage tank 6 flows through the first heat exchange tube 21, the heating tube, and the circulation pump 5 in sequence, and finally returns to the liquid storage tank 6. The circulation power of the heating medium is provided by the circulation pump 5.

[0043] This embodiment is designed to form a closed-loop heating circulation circuit, enabling the heating medium to continuously circulate in the circuit, thereby improving the heat transfer and utilization efficiency. Due to the function of the circulation pump 5 in the heating circulation circuit, the flow rate of the heating medium can be adjusted according to actual needs, thus achieving precise temperature control. The liquid storage tank 6 serves as a buffer, which can reduce temperature fluctuations caused by external factors to a certain extent and ensure that there is always enough heating medium in the circuit to prevent dry burning caused by insufficient heating medium.

[0044] As shown in the figure, in some embodiments of the present utility model, the refrigeration unit includes: a compressor 1, a condenser 7, a liquid storage tank 8, a gas-liquid separator 9, and an evaporator 11 connected in sequence. The inlet of the evaporator 11 is connected to the liquid outlet of the gas-liquid separator 9 through a throttling device 10, the outlet of the evaporator 11 is connected to the inlet of the gas-liquid separator 9, and the gas outlet of the gas-liquid separator 9 is connected to the suction side of the compressor 1. When the refrigeration unit operates, the refrigeration medium discharged by the compressor 1 flows through the condenser 7 and the liquid storage tank 8 in sequence and then enters the gas-liquid separator 9, and then flows out from the liquid outlet of the gas-liquid separator 9, flows through the throttling device 10 to the evaporator 11, enters the gas-liquid separator 9 again after flowing out from the evaporator 11, and then returns to the compressor 1 from the gas outlet of the gas-liquid separator 9. The circulating power of the refrigeration medium is provided by the compressor 1.

[0045] The advantage of this design is that the liquid storage tank 8 can store the excess liquid refrigeration medium flowing out of the condenser 7. When the load of the unit changes, the liquid storage tank 8 can play a buffering role to prevent excessive fluctuations in the refrigeration medium in the unit, thereby maintaining the stability of the unit operation. The gaseous refrigeration medium and the liquid refrigeration medium are effectively separated in the gas-liquid separator 9 to ensure that only pure gaseous refrigeration medium enters the compressor 1, preventing the liquid refrigeration medium from damaging the compressor 1. After being processed by the liquid storage tank 8 and the gas-liquid separator 9, the refrigerant entering the evaporator 11 is in the best state (i.e., pure liquid and stable flow rate), which helps to improve the heat exchange efficiency of the evaporator 11 and thus accelerate the refrigeration speed.

[0046] Based on the above connection structure of the refrigeration unit, in some feasible embodiments of the present utility model, the evaporator 11 is configured with a second fan, and the second fan drives the air in the room where the floor is located to flow through the evaporator 11. The evaporator 11 and the second fan together constitute a cold air blower for supplying cold to the room. By continuously supplying cold to the room where the floor is located through the cold air blower, the low-temperature environment in the room is maintained. At the same time, the heat of the refrigeration unit is recovered and utilized through the intermediate heat exchanger 2 to heat the floor, realizing floor protection and reducing the transfer of excess heat in the outdoor environment into the warehouse.

[0047] It should be noted that in the preferred embodiment of the present utility model, both the inlet and outlet of the ventilation pipe 4 are connected to the outdoor environment. When the heating pipe is working, the air in the outdoor environment enters the ventilation pipe 4 after being assisted by the heating pipe for heating. When the heating pipe is not working, the air in the outdoor environment enters the ventilation pipe 4, and the heat of the natural environment is used to heat the floor slab. The present utility model realizes floor slab protection through two-way switching between floor slab assisted heating and natural wind, with a wider application range and lower energy consumption.

[0048] To realize the automation of the floor heating system control, the floor heating system further includes: a controller, a temperature detection device communicatively connected to the controller. The temperature detection device is used to detect the outdoor environment temperature and / or the inlet and outlet temperatures of the intermediate heat exchanger 2. The heating circulation loop and the refrigeration unit are controlled by the controller, and the controller controls the working states of the heating circulation loop and the refrigeration unit according to the temperature data detected by the temperature detection device.

[0049] Specifically, the temperature detection device includes an outdoor temperature sensor, a first temperature sensor to a fourth temperature sensor. The first temperature sensor is arranged at the inlet of the first heat exchange pipe 21, the second temperature sensor is arranged at the outlet of the first heat exchange pipe 21, the third temperature sensor is arranged at the inlet of the second heat exchange pipe 22, and the fourth temperature sensor is arranged at the outlet of the second heat exchange pipe 22.

[0050] In addition, as a preferred solution, the floor heating system further includes: a liquid level sensor communicatively connected to the controller. The liquid level sensor is installed in the liquid storage tank 6 of the heating circulation loop. The advantage of this design is to ensure that there is sufficient heating medium in the heating circulation loop and prevent the intermediate heat exchanger 2 from dry burning.

[0051] For the convenience of understanding, a detailed description will be given below with an application example of the present utility model.

[0052] When the floor heating system is powered on

[0053] The refrigeration unit is turned on, and the outdoor environment temperature T is detected:

[0054] When the outdoor environment temperature T > 0°C, enter the normal refrigeration cycle, and the intermediate heat exchanger 2 is not turned on. The floor slab is heated and protected by natural ventilation. The first port A1 of the main switching valve 14 is opened, the third port A3 is opened, the second port A2 is closed. The first port B1 of the auxiliary switching valve 15 is opened, the second port B2 is opened, the third port B3 is closed. The refrigeration unit starts the refrigeration cycle, and the heating circulation loop is closed.

[0055] When the outdoor ambient temperature T < 0°C, the intermediate heat exchanger 2 is turned on, and the floor is heated and protected by the heating pipes. The actual liquid level θ of the liquid storage tank 6 is detected. If the set lower limit liquid level θ1 < θ < the set upper limit liquid level θ2, the first port A1, the second port A2, and the third port A3 of the main switching valve 14 are all opened, and the first port B1, the second port B2, and the third port B3 of the auxiliary switching valve 15 are all opened. The refrigeration unit starts a conventional refrigeration cycle, and the heating circulation loop is turned on. If the actual liquid level θ < the set lower limit liquid level θ1, the system alarms, the intermediate heat exchanger 2 is turned off, the heating circulation loop is turned off, and only the conventional refrigeration cycle runs.

[0056] During the operation of the floor heating system:

[0057] When the outdoor ambient temperature T ≤ 0°C, the first port A1, the second port A2, and the third port A3 of the main switching valve 14 are all opened, and the first port B1, the second port B2, and the third port B3 of the auxiliary switching valve 15 are all opened. The inlet and outlet temperatures of the first heat exchange pipe 21 and the inlet and outlet temperatures of the second heat exchange pipe 22 are detected. The first regulating valve 12 and the second regulating valve 13 are adjusted according to the floor heating to the set value. After the opening degree adjustment is completed, the floor heating system circulates.

[0058] When the outdoor ambient temperature T > 0°C, the first port A1 and the third port A3 of the main switching valve 14 are opened, and the second port A2 is closed. The first port B1 and the second port B2 of the auxiliary switching valve 15 are opened, and the third port B3 is closed. All the high-temperature exhaust gas enters the condenser 7 for heat exchange. The heat-exchanged liquid refrigeration medium flows out, falls into the liquid receiver 8, passes through the throttling device 10 through the gas-liquid separator 9 for throttling and pressure reduction, flows into the evaporator 11 for evaporation, and then passes through the gas-liquid separator 9 for gas-liquid separation. The gaseous refrigeration medium returns to the compressor 1 to enter the next refrigeration cycle.

[0059] It should be understood that in order to facilitate the installation and maintenance of the liquid storage tank 6, the intermediate heat exchanger 2, etc., stop valves can be set on the inlet and outlet pipelines of the liquid storage tank 6, stop valves can be set on the inlet and outlet pipelines of the heat exchange pipes of the intermediate heat exchanger 2, and stop valves can also be set on the inlet pipelines of the condenser 7 and the evaporator 11. In order to prevent the reverse flow of the first heat exchange pipe 21 and the second heat exchange pipe 22 of the intermediate heat exchanger 2, check valves are set on the inlet pipeline of the first heat exchange pipe 21 and the outlet of the second heat exchange pipe 22. Stop valves, check valves, etc. are all common valve parts and can be designed according to actual needs.

[0060] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The execution order of actions, steps, etc. in the devices and methods shown in the specification and drawings can be implemented in any order as long as there is no specific explicit order limitation and the output of the previous process is not used in the subsequent process. The similar sequential terms used for convenience of description do not mean that implementation must be in such an order.

[0061] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorized specification. In all examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof in subsequent drawings is not required.

[0062] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Floor heating system, comprising: Heating circulation loop and refrigeration unit, the refrigeration unit supplies heat to the heating circulation loop through an intermediate heat exchanger, and the heating circulation loop has heating pipes connected to the outlet side of the intermediate heat exchanger; characterized in that it further includes: a ventilation pipe and a first fan, the ventilation pipe is buried in the floor, and the first fan drives air to flow through the heating pipes and into the ventilation pipe.

2. The floor heating system according to claim 1, characterized in that The intermediate heat exchanger includes: a first heat exchange pipe and a second heat exchange pipe that exchange heat with each other, the first heat exchange pipe is connected to the heating circulation loop, and the second heat exchange pipe is connected to the refrigeration unit; The heating pipes are connected to the outlet side of the first heat exchange pipe, and the second heat exchange pipe is connected to the exhaust side of the compressor of the refrigeration unit.

3. The floor heating system according to claim 2, wherein A regulating valve for controlling the flow rate is installed on the first heat exchange pipe and / or the second heat exchange pipe.

4. The floor heating system according to claim 2, characterized in that, The exhaust side of the compressor of the refrigeration unit is connected in parallel to the condenser and the second heat exchange pipe through a main switching valve, and the main switching valve is used to control the flow direction of the refrigerant to the condenser and / or the second heat exchange pipe.

5. The floor heating system according to claim 4, characterized in that, The outlet of the second heat exchange pipe is connected to the inlet of the condenser through a sub-switching valve, and the sub-switching valve is used to control the flow direction of the refrigerant to the condenser.

6. The floor heating system according to claim 2, characterized in that The heating circulation loop includes: a first heat exchange pipe, heating pipes, a circulation pump, and a liquid storage tank connected in sequence, and the outlet of the liquid storage tank is connected to the inlet side of the first heat exchange pipe.

7. The floor heating system according to claim 1, wherein The refrigeration unit includes: a compressor, a condenser, a liquid receiver, a gas-liquid separator, and an evaporator connected in sequence. The inlet of the evaporator is connected to the liquid outlet of the gas-liquid separator through a throttling device, the outlet of the evaporator is connected to the inlet of the gas-liquid separator, and the gas outlet of the gas-liquid separator is connected to the suction side of the compressor.

8. The floor heating system according to claim 1, characterized in that, It further includes: A controller and a temperature detection device communicatively connected to the controller. The temperature detection device is used to detect the outdoor ambient temperature and / or the inlet and outlet temperatures of the intermediate heat exchanger, and the heating circulation loop and the refrigeration unit are controlled by the controller.

9. The floor heating system according to claim 8, characterized in that, It further includes: A liquid level sensor communicatively connected to the controller, and the liquid level sensor is installed in the liquid storage tank of the heating circulation loop.

10. The floor heating system according to any one of claims 1 to 9, characterized in that, Both the inlet and outlet of the ventilation pipe communicate with the outdoor environment.

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