A floor heating system based on paraffin phase change material and a control method thereof

Abstract

The application provides a floor heating system based on a paraffin phase change material and a control method, and comprises the following: a moisture-proof film layer arranged on a floor structure layer; a heat preservation layer arranged on the moisture-proof film layer; a concrete backfill layer arranged on the reflection layer, wherein a floor heating coil is embedded in the concrete backfill layer, the floor heating coil is filled with paraffin phase change material, and an electric heating module and a temperature monitoring probe are arranged in the paraffin phase change material; the temperature monitoring probe is used for monitoring the temperature in the floor heating coil, the electric heating module is connected with commercial power through an electric switch; a ground decoration layer is arranged on the concrete backfill layer; a temperature sensor for monitoring room temperature is arranged indoors; a control module receives the temperature in the floor heating coil and the room temperature, and controls the on-off of the electric switch according to the current time period of electricity price, wherein the time period of electricity price comprises a valley electricity time period, a flat electricity time period and a peak electricity time period. Compared with the existing floor heating system, the operation energy consumption and cost are greatly reduced.

Description

Technical Field

[0001] This application relates to the field of underfloor heating technology, specifically to an underfloor heating system and control method based on paraffin phase change material. Background Technology

[0002] In existing underfloor heating systems, water is used as the heating medium. Heat source equipment heats the water to a temperature that meets heating requirements but does not exceed 60°C. A circulating pump then circulates the water through pipes buried in the ground to dissipate heat. Methods of heating the water typically include centralized heating and individual heating. Centralized heating involves heat loss through pipework, while individual heating involves high electricity / gas costs. Therefore, existing underfloor heating systems suffer from both high energy consumption and high operating costs. Summary of the Invention

[0003] The technical problem to be solved by this application is the high energy consumption and high cost of existing underfloor heating systems, and thus provides an underfloor heating system and control method based on paraffin phase change material.

[0004] Firstly, the technical solution of this application provides a floor heating system based on paraffin phase change material, comprising: A moisture-proof membrane layer is installed on the floor slab structural layer; A heat-insulating layer disposed on the moisture-proof film layer; A concrete backfill layer is set on the reflective layer, and a floor heating coil is embedded in the concrete backfill layer. The floor heating coil is filled with paraffin phase change material, and an electric heating module and a temperature monitoring probe are placed in the paraffin phase change material. The temperature monitoring probe is used to monitor the temperature inside the floor heating coil, and the electric heating module is connected to the mains power through an electric switch. A floor decoration layer installed on the concrete backfill layer; A temperature sensor installed indoors to monitor room temperature; The control module receives the temperature inside the pipe and the room temperature, and controls the on / off state of the electrical switch according to the current electricity price period, which includes off-peak electricity period, flat electricity period and peak electricity period.

[0005] In some solutions, the paraffin phase change material-based underfloor heating system is described, wherein the paraffin phase change material filling the underfloor heating coil is a composite paraffin material obtained by mixing two or more paraffin materials.

[0006] In some schemes, the floor heating system based on paraffin phase change material is described, wherein the paraffin phase change material is a composite paraffin material obtained by mixing 48# paraffin and C18 paraffin in a mass ratio of 7:3.

[0007] Some of the proposed floor heating systems based on paraffin phase change materials also include pressure tanks. The two ports of the pressure tank are respectively connected to the two ports of the underfloor heating coil.

[0008] In some solutions for underfloor heating systems based on paraffin phase change materials, the thickness of the moisture-proof film layer is 0.5 ± a mm; The thickness of the insulation layer is 20±b mm; The thickness of the reflective layer is 0.06 ± c mm; The thickness of the concrete backfill layer is 5 ± d cm; In the above, a, b, c, and d are redundant error parameters.

[0009] Secondly, this application provides a control method applied to the control module of the underfloor heating system based on paraffin phase change material as described in any of the first aspects, the method comprising: If the current time is during off-peak electricity hours, then: When the room temperature T1A ≤ (heating set temperature T2A + temperature adjustment range T4), or when the heating set temperature T2A < room temperature T1A ≤ (heating set temperature T2A + temperature adjustment range T4) and the pipe temperature T3A ≤ the upper limit of the pipe temperature T5, the electric switch will be activated. When the room temperature T1A > (heating set temperature T2A + temperature adjustment range T4), or when the heating set temperature T2A < room temperature T1A ≤ (heating set temperature T2A + temperature adjustment range T4) and the pipe temperature T3A > the upper limit of the pipe temperature T5, the electric switch is turned off.

[0010] Furthermore, the control method further includes: If the current time is a period of normal electricity supply, then: When the room temperature T1A ≤ (heating set temperature T2A - 0.5 × temperature adjustment range T4), or when the heating set temperature T2A < room temperature T1A ≤ (heating set temperature T2A - 0.5 × temperature adjustment range T4) and the pipe temperature T3A ≤ (upper limit of pipe temperature T5 + lower limit of pipe temperature T6) / 2, the electric switch will be activated. When the room temperature T1A > (heating set temperature T2A + 0.5 × temperature adjustment range T4), or when the heating set temperature T2A < room temperature T1A ≤ (heating set temperature T2A - 0.5 × temperature adjustment range T4) and the pipe temperature T3A > (upper limit of pipe temperature T5 + lower limit of pipe temperature T6) / 2, the electric switch is turned off.

[0011] Furthermore, the control method further includes: If the current time is during peak electricity hours, then: When the room temperature T1A is less than (heating set temperature T2A - temperature adjustment range T4), or when the heating set temperature T2A is greater than or equal to the room temperature T1A and greater than (heating set temperature T2A - temperature adjustment range T4) and the pipe temperature T3A is less than the lower limit of the pipe temperature T6, the electric switch will be activated. When the room temperature T1A is greater than or equal to (heating set temperature T2A - temperature adjustment range T4), or when the heating set temperature T2A is greater than or equal to the room temperature T1A and (heating set temperature T2A - temperature adjustment range T4) and the pipe temperature T3A is greater than or equal to the lower limit of the pipe temperature T6, the electric switch is turned off.

[0012] Thirdly, the present application provides a computer-readable storage medium storing program information, wherein a computer reads the program information and executes the steps of the control method described in any of the second aspects.

[0013] Fourthly, the present application provides a computer program product, including a computer program / instructions, which, when executed by a processor, implement the steps of the control method described in any of the second aspects.

[0014] The technical solution provided in this application has the following technical effects compared with the prior art: This application provides a floor heating system and control method based on paraffin phase change material. The system consists of a moisture-proof film layer, an insulation layer, a reflective layer, a concrete backfill layer, and a floor decoration layer, sequentially installed on the floor slab structure. Floor heating pipes are embedded in the concrete backfill layer, with paraffin phase change material as the medium. An electric heating module and a temperature monitoring probe are run through the paraffin phase change material. The electric heating module heats the paraffin phase change material, providing heat; the temperature monitoring probe monitors the temperature inside the pipes. Room temperature is obtained by installing a temperature sensor indoors. The control module receives the pipe temperature and room temperature, and controls whether the electric heating module performs heating based on electricity price periods. Under the same self-heating conditions, paraffin phase change material has high latent heat of phase change and high stability, allowing it to store heat during off-peak hours. When heat needs to be released during the day, the phase change heat release of the paraffin phase change material, combined with the thermal inertia of the building materials themselves, provides a stable heat source for the building. Compared to existing floor heating systems, this method significantly reduces operating energy consumption and costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the ground structure of a floor heating system based on paraffin phase change material according to one embodiment of this application; Figure 2 This is a schematic cross-sectional view of a floor heating coil according to one embodiment of this application; Figure 3This is a schematic diagram illustrating the assembly relationship of the underfloor heating coils according to one embodiment of this application; Figure 4 This is a schematic diagram of the communication connection of the device according to one embodiment of this application; Figure 5 This is a schematic diagram of the control logic during off-peak hours of the control method described in one embodiment of this application; Figure 6 This is a schematic diagram of the control logic during a normal power supply period in one embodiment of the control method described in this application; Figure 7 This is a schematic diagram of the control logic during peak power periods of the control method described in one embodiment of this application. Detailed Implementation

[0016] The specific embodiments of this application will be further described below with reference to the accompanying drawings.

[0017] It is readily understood that, based on the technical solution of this application, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of this application. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this application and should not be considered as the entirety of this application or as limitations or restrictions on the technical solution of the application.

[0018] This embodiment provides a floor heating system based on paraffin phase change material, combined with... Figures 1 to 4 As shown, it includes: A moisture-proof film layer 102 is installed on the floor slab structural layer 101; a thermal insulation layer 103 is installed on the moisture-proof film layer 102; a reflective layer 104 is installed on the thermal insulation layer 103; a concrete backfill layer 105 is installed on the reflective layer 104, and a floor heating coil 106 is embedded in the concrete backfill layer 105; a floor decoration layer 107 is installed on the concrete backfill layer 105; such as Figure 2 As shown, the underfloor heating coil 106 is filled with paraffin phase change material 1061, and an electric heating module 1062 and a temperature monitoring probe 1063 are placed within the paraffin phase change material; the temperature monitoring probe 1063 is used to monitor the temperature inside the underfloor heating coil 106, and the electric heating module 1062 is connected to the mains power supply via an electric switch. Combined with... Figure 3 and Figure 4 As shown, the system also includes a temperature sensor 108 installed indoors for monitoring room temperature; and a control module that receives the temperature inside the pipe and the room temperature, and controls the on / off state of the power switch according to the current electricity price period, which includes off-peak electricity period, flat electricity period and peak electricity period.

[0019] In the above structure, the moisture-proof film layer 102 is used to block underground moisture and prevent the insulation layer from becoming damp and failing; the insulation layer 103 is used to reduce the downward transfer of heat and improve the heat utilization efficiency; the reflective layer 104 is used to reflect the upward radiated heat to the indoor direction and reduce heat loss; the concrete backfill layer 105 embeds the underfloor heating coil 106, and this backfill layer has both structural support and secondary heat storage functions; the floor decoration layer 107 is such as flooring or ceramic tiles. The paraffin phase change material 1061 filled in the underfloor heating coil 106 can be a paraffin-based composite phase change material with a melting point between 28℃ and 45℃. It has the characteristics of chemical stability, non-corrosiveness, and high latent heat of phase change (≥180 kJ / kg). The paraffin phase change material can absorb or release a large amount of latent heat at a constant temperature. When applied to the underfloor heating system, it can realize off-peak electricity heat storage and peak electricity heat release, which has significant energy saving and economic benefits. The temperature monitoring probe 1063 is used to monitor the temperature inside the underfloor heating coil 106 in real time, i.e., the temperature of the paraffin phase change material. The electric heating module 1062 is connected to the mains power supply via an electric switch, which can be a relay or a solid-state relay, and is driven by the control module. The temperature sensor 108 is installed on a wall or in a well-ventilated area 1.2–1.5 meters above the ground, avoiding proximity to doors, windows, or heat sources. The control module can be a PLC, a microcontroller, or a smart thermostat, receiving the temperature inside the coil and the room temperature, and controlling the on / off state of the electric switch according to the current electricity price period. Among the electricity price periods, the off-peak period is the period with the lowest electricity price, usually at night; the average period is the period with a moderate electricity price; and the peak period is the period with the highest electricity price, usually during the daytime peak electricity consumption period. The control module has a built-in timetable and electricity price period table, and as an feasible solution, it can execute the following control logic: Off-peak heating and energy storage: If the indoor temperature is lower than the user-set temperature (e.g., 20℃) and the temperature inside the pipe has not reached the temperature at which the paraffin wax completely melts (e.g., 50℃), the control switch will close, and the electric heating module will work to heat the paraffin wax to melt and store heat. Heating will stop when the temperature inside the pipe reaches the upper limit threshold (e.g., 55℃) or the room temperature exceeds the set temperature + 1℃.

[0020] During peak electricity hours, the electric switch remains off, and the electric heating module does not operate. Underfloor heating relies on the heat released from the solidification of paraffin wax to maintain room temperature. If the room temperature falls below the set temperature... If the temperature inside the tube is 1℃ higher than the phase change point, the system will not start electric heating and will prioritize the use of latent heat of phase change.

[0021] Supplemental heating during normal power supply periods: If the room temperature is lower than the set temperature. If the temperature inside the tube is 1℃ lower than the lower limit of the phase change temperature range (e.g., 30℃), then briefly start electric heating until the room temperature reaches the standard or the temperature inside the tube rises back to the phase change range, to avoid over-reliance on peak electric heating.

[0022] In this embodiment, a moisture-proof film layer 102, an insulation layer 103, a reflective layer 104, a concrete backfill layer 105, and a floor decoration layer 107 are sequentially arranged on the floor slab structural layer 101. Underfloor heating pipes 106 are embedded in the concrete backfill layer 105. The medium in the underfloor heating pipes 106 is paraffin phase change material 1061. An electric heating module 1062 and a temperature monitoring probe 1063 are inserted through the paraffin phase change material 1061. The electric heating module 1062 heats the paraffin phase change material 1061, providing heat; the temperature monitoring probe 1063 monitors the temperature inside the pipe. The room temperature is obtained by installing a temperature sensor 108 indoors. The control module receives the pipe temperature and room temperature, and controls whether the electric heating module performs heating based on the electricity price period. Under independent heating conditions, paraffin phase change materials possess characteristics such as high latent heat of phase change and high stability, enabling them to store heat during off-peak electricity hours. When heat needs to be released during the day, the phase change heat release of the paraffin phase change material, combined with the thermal inertia of the building materials themselves, can provide a stable heat source for the building interior. Compared to existing underfloor heating systems, this results in a significant reduction in both operating energy consumption and costs.

[0023] In some solutions for underfloor heating systems based on paraffin phase change materials, the paraffin phase change material filling the underfloor heating coils is a composite paraffin material obtained by mixing two or more paraffin materials. Further, in this solution, the paraffin phase change material is a composite paraffin material obtained by mixing 48# paraffin and C18 paraffin in a mass ratio of 7:3. The purpose of using multiple paraffin materials in this solution is: Adjusting the phase change temperature range: Different grades of paraffin wax have different melting points. By mixing them, a suitable phase change temperature can be obtained in a temperature range that cannot be met by a single type of paraffin wax, making it more suitable for underfloor heating needs (usually 30℃–45℃).

[0024] Expanding the phase change platform: Single paraffin has a relatively narrow phase change temperature, while composite paraffin can form a wider phase change temperature platform, prolonging the heat release time and improving the stability of heating.

[0025] By optimizing the thermophysical parameters and compounding paraffins with different carbon chain lengths, a balance can be achieved between latent heat of phase change, thermal conductivity, and volume expansion rate, thereby improving the overall performance of the material.

[0026] To suppress supercooling and phase separation, combining some low-melting-point paraffin with high-melting-point paraffin can reduce supercooling during crystallization and improve the uniformity of component distribution in the liquid phase.

[0027] According to GB / T 254-2010 standard, 48# paraffin wax is a fully refined paraffin wax with a melting point of approximately 48℃, belonging to the medium-to-high melting point paraffin wax category. It has a relatively high latent heat of phase change (approximately 200–220 kJ / kg) and primarily serves as a heat storage medium in the high-temperature range. C18 paraffin wax, on the other hand, has a melting point of approximately 28℃ and a latent heat of phase change of approximately 240–250 kJ / kg. It belongs to the low-temperature phase change material category and is used to adjust the initial melting temperature of composite materials and broaden the phase change range. When 48# paraffin wax and C18 paraffin wax are mixed at a mass ratio of 7:3, the phase change temperature range of the composite material is approximately 32℃–44℃, covering the typical operating temperature range of underfloor heating. At this ratio, the latent heat of phase change of the composite material can be maintained at 190–210 kJ / kg, resulting in a high heat storage density. Furthermore, differential scanning calorimetry testing shows that the supercooling of the composite paraffin wax at this ratio is less than 3℃, and the phase change performance decay is less than 5% after 200 cycles, demonstrating good thermal cycling stability.

[0028] Some of the proposed solutions describe underfloor heating systems based on paraffin phase change materials, such as... Figure 3 As shown, the system also includes a pressure tank: the two ports of the pressure tank are respectively connected to the two ports of the underfloor heating coil 106. The pressure tank is located at the inlet and outlet of the underfloor heating coil and is connected to the internal cavity of the underfloor heating coil, allowing the paraffin phase change material to squeeze its volume increase into the pressure tank when it melts and expands, and to be drawn back from the pressure tank when it solidifies and shrinks. The pressure tank can be selected as a pre-pressurized diaphragm pressure tank or an airbag pressure tank.

[0029] Preferably, in some embodiments of the underfloor heating system based on paraffin phase change material, the thickness of the moisture-proof film layer is 0.5±a mm; the thickness of the insulation layer is 20±b mm; the thickness of the reflective layer is 0.06±c mm; and the thickness of the concrete backfill layer is 5±d cm; where a, b, c, and d are redundant error parameters. By adopting the above-mentioned optimized thicknesses and redundant error parameters, the system exhibits optimal thermal performance, with sufficient insulation layer thickness to reduce heat loss and a moderate backfill layer thickness to provide suitable thermal inertia; it has strong compatibility, suitable for most building floor structures such as residential and office buildings; and it has a long service life, with reasonable thicknesses of the moisture-proof and insulation layers to prevent moisture-induced failure.

[0030] Secondly, the technical solution of this application provides a control method, which is applied to the control module of the underfloor heating system based on paraffin phase change material as described in any of the first aspects, and is executed for a single room.

[0031] The parameters to be applied to this method are defined as follows: T1A indicates the current room temperature, measured in real-time by temperature sensor 108, in °C. T2A represents the heating set temperature, which can be set by the user or by the system default, and can be 18–24 ℃, in ℃. T3A represents the temperature inside the pipe, which is the real-time measurement value of the temperature monitoring probe 1063, with the unit of °C; T4 represents the temperature adjustment range, the allowable fluctuation range, which can be 0.5–1.0 °C, with the unit of °C; T5 represents the upper limit value of the temperature inside the pipe, the highest allowable temperature of the paraffin phase change material, which can be 45–60 °C, with the unit of °C; T6 is the lower limit value of the temperature inside the pipe, the lowest allowable temperature of the paraffin phase change material, which can be 25–35 °C, with the unit of °C.

[0032] As Figure 5 shown, the method includes: If the current time is the valley electricity period, then: When the room temperature T1A ≤ (heating set temperature T2A + temperature adjustment range T4) [indicating that the room temperature does not exceed the comfort upper limit], or, when the heating set temperature T2A < room temperature T1A ≤ (heating set temperature T2A + temperature adjustment range T4) and the temperature inside the pipe T3A ≤ the upper limit value of the temperature inside the pipe T5 [indicating that the room temperature is within the adjustment area and the pipe temperature is not exceeded], the electric switch is closed; When the room temperature T1A > (heating set temperature T2A + temperature adjustment range T4) [indicating that the room temperature exceeds the comfort upper limit], or, when the heating set temperature T2A < room temperature T1A ≤ (heating set temperature T2A + temperature adjustment range T4) and the temperature inside the pipe T3A > the upper limit value of the temperature inside the pipe T5 [indicating that although the room temperature is within the adjustment area, the pipe temperature has exceeded the limit], the electric switch is opened.

[0033] In the above solution, when the room temperature does not exceed the comfort upper limit (T1A ≤ T2A + T4) or the room temperature is within the adjustment area and the pipe temperature is not exceeded (T2A < T1A ≤ T2A + T4 and T3A ≤ T5), the electric switch is closed, and the paraffin phase change material is heated by using the low-cost electric energy during the valley electricity period for energy storage, making full use of the low-cost energy storage during the valley electricity period. The valley electricity price is usually 1 / 3 to 1 / 2 of the peak electricity price. Calculated based on 8 hours of valley electricity per day, the operating electricity cost can be reduced by 40%–60%. When the room temperature has exceeded the comfort upper limit (T1A > T2A + T4), the electric switch is opened to prevent excessive heating and energy waste; when the room temperature is within the adjustment area but the pipe temperature has exceeded the limit (T2A < T1A ≤ T2A + T4 and T3A > T5), the electric switch is also opened to avoid overheating of the paraffin and resulting in excess energy, and to avoid ineffective heating and energy waste.

[0034] Furthermore, as Figure 6 shown, the control method further includes: If the current time is the flat electricity period, then: When the room temperature T1A ≤ (heating set temperature T2A - 0.5 × temperature adjustment range T4), or when the heating set temperature T2A < room temperature T1A ≤ (heating set temperature T2A - 0.5 × temperature adjustment range T4) and the temperature inside the pipe T3A ≤ (upper limit value of the temperature inside the pipe T5 + lower limit value of the temperature inside the pipe T6) / 2, the electric switch closes; when the room temperature T1A > (heating set temperature T2A + 0.5 × temperature adjustment range T4), or when the heating set temperature T2A < room temperature T1A ≤ (heating set temperature T2A - 0.5 × temperature adjustment range T4) and the temperature inside the pipe T3A > (upper limit value of the temperature inside the pipe T5 + lower limit value of the temperature inside the pipe T6) / 2, the electric switch opens.

[0035] In the above solution, when the room temperature is in the comfortable range and the paraffin heat storage is sufficient, the electric switch opens, preferentially using the stored latent heat of phase change to avoid additional power consumption during the flat electricity period. (T5 + T6) / 2 is used as the dividing line for judging whether supplementary heating is allowed. When the pipe temperature is higher than the median value, it is considered that the heat storage margin is sufficient and no further heating is carried out; when it is lower than the median value, moderate supplementation is allowed. This avoids two extreme situations: blindly heating when the heat storage is still sufficient and waiting for heat release when the heat storage has been exhausted, achieving the optimal allocation of heat storage resources.

[0036] Further, as Figure 7 shown, the control method further includes: If the current time is the peak electricity period, then: When the room temperature T1A < (heating set temperature T2A - temperature adjustment range T4), or when the heating set temperature T2A ≥ room temperature T1A > (heating set temperature T2A - temperature adjustment range T4) and the temperature inside the pipe T3A < the lower limit value of the temperature inside the pipe T6, the electric switch closes; When the room temperature T1A ≥ (heating set temperature T2A - temperature adjustment range T4), or when the heating set temperature T2A ≥ room temperature T1A > (heating set temperature T2A - temperature adjustment range T4) and the temperature inside the pipe T3A ≥ the lower limit value of the temperature inside the pipe T6, the electric switch opens.

[0037] In the above solution, during the peak electricity period, it is default to mainly release heat, and electric heating is only started in extreme cases. The condition for the electric switch to close needs to meet that the room temperature is lower than the lower limit T2A - T4, or the room temperature is in the underheated area and the paraffin heat storage is exhausted T3A < T6, ensuring the minimum power consumption during the peak electricity period. When the room temperature is in the underheated range (T2A - T4 < T1A < T2A) and the paraffin still has heat storage margin (T3A ≥ T6), the electric switch opens, and the room temperature is maintained entirely by the heat release of paraffin solidification without consuming peak electricity.

[0038] In the third aspect, the technical solution of the present application provides a computer-readable storage medium, in which program information is stored, and after the computer reads the program information, it executes the steps of the control method described in any one of the second aspects.

[0039] Fourthly, the present application provides a computer program product, including a computer program / instructions, which, when executed by a processor, implement the steps of the control method described in any of the second aspects.

[0040] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0041] The above are merely the principles and preferred embodiments of this application. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of this application, and these modifications should also be considered within the scope of protection of this application.

Claims

1. A floor heating system based on a paraffin phase change material, characterized in that, include: A moisture-proof membrane layer is installed on the floor slab structural layer; A heat-insulating layer disposed on the moisture-proof film layer; A concrete backfill layer is set on the reflective layer, and a floor heating coil is embedded in the concrete backfill layer. The floor heating coil is filled with paraffin phase change material, and an electric heating module and a temperature monitoring probe are placed in the paraffin phase change material. The temperature monitoring probe is used to monitor the temperature inside the floor heating coil, and the electric heating module is connected to the mains power through an electric switch. A floor decoration layer installed on the concrete backfill layer; A temperature sensor installed indoors to monitor room temperature; The control module receives the temperature inside the pipe and the room temperature, and controls the on / off state of the electrical switch according to the current electricity price period, which includes off-peak electricity period, flat electricity period and peak electricity period.

2. The underfloor heating system based on paraffin phase change material according to claim 1, characterized in that: The paraffin phase change material filling the underfloor heating coil is a composite paraffin material obtained by mixing two or more paraffin materials.

3. The underfloor heating system based on paraffin phase change material according to claim 2, characterized in that: The paraffin phase change material is a composite paraffin material obtained by mixing 48# paraffin and C18 paraffin in a mass ratio of 7:

3. 4.The floor heating system based on the paraffin phase change material of claim 1, wherein, Also includes pressure tanks: The two ports of the pressure tank are respectively connected to the two ports of the underfloor heating coil.

5. The underfloor heating system based on paraffin phase change material according to any one of claims 1-4, characterized in that: The thickness of the moisture-proof film layer is 0.5 ± a mm; The thickness of the insulation layer is 20±b mm; The thickness of the reflective layer is 0.06 ± c mm; The thickness of the concrete backfill layer is 5 ± d cm; In the above, a, b, c, and d are redundant error parameters.

6. A control method characterized by, The method, applied in the control module of the underfloor heating system based on paraffin phase change material according to any one of claims 1-5, comprises: If the current time is during off-peak electricity hours, then: When the room temperature T1A ≤ (heating set temperature T2A + temperature adjustment range T4), or when the heating set temperature T2A < room temperature T1A ≤ (heating set temperature T2A + temperature adjustment range T4) and the pipe temperature T3A ≤ the upper limit of the pipe temperature T5, the electric switch will be activated. When the room temperature T1A > (heating set temperature T2A + temperature adjustment range T4), or when the heating set temperature T2A < room temperature T1A ≤ (heating set temperature T2A + temperature adjustment range T4) and the pipe temperature T3A > the upper limit of the pipe temperature T5, the electric switch is turned off.

7. The control method according to claim 6, characterized by Also includes: If the current time is a period of normal electricity supply, then: When the room temperature T1A ≤ (heating set temperature T2A - 0.5 × temperature adjustment range T4), or when the heating set temperature T2A < room temperature T1A ≤ (heating set temperature T2A - 0.5 × temperature adjustment range T4) and the pipe temperature T3A ≤ (upper limit of pipe temperature T5 + lower limit of pipe temperature T6) / 2, the electric switch will be activated. When the room temperature T1A > (heating set temperature T2A + 0.5 × temperature adjustment range T4), or when the heating set temperature T2A < room temperature T1A ≤ (heating set temperature T2A - 0.5 × temperature adjustment range T4) and the pipe temperature T3A > (upper limit of pipe temperature T5 + lower limit of pipe temperature T6) / 2, the electric switch is turned off.

8. The control method according to claim 6, characterized by, Also includes: If the current time is during peak electricity hours, then: When the room temperature T1A is less than (heating set temperature T2A - temperature adjustment range T4), or when the heating set temperature T2A is greater than or equal to the room temperature T1A and greater than (heating set temperature T2A - temperature adjustment range T4) and the pipe temperature T3A is less than the lower limit of the pipe temperature T6, the electric switch will be activated. When the room temperature T1A is greater than or equal to (heating set temperature T2A - temperature adjustment range T4), or when the heating set temperature T2A is greater than or equal to the room temperature T1A and (heating set temperature T2A - temperature adjustment range T4) and the pipe temperature T3A is greater than or equal to the lower limit of the pipe temperature T6, the electric switch is turned off.

9. A computer-readable storage medium, characterized in that, The storage medium stores program information, and after the computer reads the program information, it executes the steps of the control method according to any one of claims 6-8.

10. A computer program product, characterised in that, Includes a computer program / instructions that, when executed by a processor, implement the steps of the control method according to any one of claims 6-8.

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