A photovoltaic driven double-layer electric heating film floor radiant heating system suitable for building continuous heating

Abstract

The application discloses a photovoltaic driving double-layer electric heating film floor radiant heating system suitable for building continuous heating, which comprises a photovoltaic power generation system and a double-layer electric heating film floor radiant heating system; the photovoltaic power generation system is used for absorbing solar energy and converting the solar energy into electric energy to supply power for the double-layer electric heating film floor radiant heating system; the double-layer electric heating film floor radiant heating system is used for transferring heat energy in the form of far infrared radiation and convection to improve indoor temperature. The application utilizes solar energy to generate electricity, uses double-layer electric heating films as heating bodies and uses pebble layers as heat accumulators to realize rapid heating of shallow electric heating films to meet the daytime indoor heating demand, intermittent heat production of deep electric heating films and heat storage of the pebble layers to meet the nighttime indoor heating demand.

Description

Technical Field

[0001] This invention relates to the field of residential heating technology utilizing renewable energy, and specifically to a photovoltaic-driven double-layer electric heating film floor radiant heating system suitable for continuous building heating. Background Technology

[0002] Traditional heating systems rely primarily on fossil fuels such as coal, resulting in high energy consumption and severe pollution, which fails to meet the current urgent needs for energy conservation, carbon reduction, and green development. Solar energy, as a major renewable energy source, is widely available, clean, harmless, and sustainable, making its use for heating a priority development direction.

[0003] However, traditional solar thermal heating systems suffer from poor operational stability, severe overheating during the off-heating season, and a high rate of damage to collector components, making them unsuitable for remote rural areas where after-sales maintenance is inconvenient. In contrast, solar photovoltaic systems offer stable operation and a low failure rate, making them suitable for remote rural areas.

[0004] Photovoltaic electric heating film heating systems have advantages such as system simplicity, low cost, and easy installation, making them very suitable for single-family buildings in remote villages and towns. They are one of the commonly used heating methods both domestically and internationally. While heating is achieved by laying an electric heating film indoors and using photovoltaic power generation to drive the film, the intermittent and unstable nature of solar radiation leads to intermittent and unsustainable indoor heating.

[0005] To achieve continuous indoor heating using photovoltaic electric heating film, the analysis of the current status and development trend of distributed power generation mentioned using battery systems to smooth out fluctuations in solar radiation to ensure the continuity of heating. However, batteries have high manufacturing costs, large storage and discharge losses, and short service life, making large-scale promotion impossible. The widespread adoption of photovoltaic electric heating film is mainly due to its low manufacturing cost, which contradicts the original intention of this system.

[0006] To achieve continuous heating with battery-free photovoltaic heating films, the following two methods are currently mainly used: The first method is to utilize the heat storage function of phase change materials to achieve continuous heating throughout the day. However, inorganic phase change materials have poor cycle stability and are prone to phase separation, while organic phase change materials have low thermal conductivity, are flammable and volatile, and are expensive, which contradicts the low cost advantage of photovoltaic heating films. The second method is to lay the heating film deep into the building envelope to store heat. However, due to the high thermal inertia of the building envelope, the heat release is slow. The heat released by the building envelope at night and the heat generated by the heating film the next morning are difficult to be quickly released into the room to raise the indoor temperature, which cannot meet the demand for continuous heating throughout the day.

[0007] To meet the requirement of continuous 24-hour indoor heating from photovoltaic electric heating film, a double-layer electric heating film floor radiant heating system with a combination of shallow and deep layers is proposed. The shallow electric heating film heats up rapidly to meet daytime heating needs, while the deep electric heating film, which generates heat intermittently, is combined with a heat storage layer that stores daytime heat to meet nighttime heating needs, thereby achieving continuous heating of the building without an energy storage system. Summary of the Invention

[0008] To overcome the above technical problems, the present invention aims to provide a photovoltaic-driven double-layer electric heating film floor radiant heating system suitable for continuous building heating. It utilizes solar energy to generate electricity, with the double-layer electric heating film as the heating element and the pebble layer as the heat storage element. This allows the shallow electric heating film to rapidly heat up to meet the indoor daytime heating needs, while the deep electric heating film intermittently generates heat and uses the pebble layer to store heat to meet the indoor nighttime heating needs.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A photovoltaic-driven double-layer electric heating film floor radiant heating system suitable for continuous building heating is characterized by comprising a photovoltaic power generation system and a double-layer electric heating film floor radiant heating system.

[0011] The photovoltaic power generation system is used to absorb solar energy and convert it into electrical energy to power the double-layer electric heating film floor radiant heating system.

[0012] The double-layer electric heating film floor radiant heating system is used to transfer heat energy to the outside in the form of far-infrared radiation and convection, thereby increasing the indoor temperature.

[0013] The photovoltaic power generation system includes a solar photovoltaic module 1 and a solar inverter integrated machine 2. The solar photovoltaic module 1 absorbs solar energy during the day and converts it into direct current. The solar inverter integrated machine 2 converts the direct current into alternating current and sends it into the electric heating film floor radiant heating system.

[0014] The solar photovoltaic module 1 is formed by connecting individual solar cells in series, parallel, and encapsulating them to form a solar cell module. The solar cell modules are then connected in series and parallel to form the module. During installation, the tilt angle needs to be determined first for bracket installation. After the bracket installation and adjustment are completed, the solar photovoltaic module 1 is installed. The electrical energy generated by the solar photovoltaic module 1 supplies power to the double-layer electric heating film floor radiant heating system through the solar inverter integrated machine 2. When the solar photovoltaic module 1 is insufficient to meet the electrical energy requirements of the electric heating film 5-1, the electric heating film 5-1 is connected to the municipal power supply 3.

[0015] The double-layer electric heating film floor radiant heating system includes a thermostat 4-1, an electric heating film 5-1, a thermostat 4-2, and an electric heating film 5-2. The electric heating film 5-1 is laid in a shallow layer on the indoor floor, and the electric heating film 5-2 is laid in a deep layer on the indoor floor. A pebble layer 8-5 is laid on the protective layer 8-4 of the electric heating film 5-2 for heat storage during the day and heat dissipation at night. The electrical energy generated by the solar photovoltaic module 1 is transmitted to the double-layer electric heating film floor radiant heating system through the solar inverter integrated machine 2. The thermostat 4-1 supplies power to the electric heating film 5-1 to generate heat and increase the indoor temperature, or the thermostat 4-2 supplies power to the electric heating film 5-2 to generate heat and utilizes the pebble layer 8-5 to store the heat energy.

[0016] The system employs a double-layer electric heating film, consisting of a shallow electric heating film 5-1 and a deep electric heating film 5-2, which alternately operates during the day to meet the continuous heating needs throughout the day. When the indoor temperature is lower than the minimum set temperature of the thermostat 4-1, the electric heating film 5-1 rapidly heats up and radiates heat through the decorative layer 8-7 to the room to meet the heating requirements. When the indoor temperature is higher than the maximum set temperature of the thermostat 4-1, the electric heating film 5-1 is de-energized, the electric heating film 5-2 is energized to generate heat, and the pebble layer 8-5 stores thermal energy. When the indoor temperature is higher than the maximum set temperature of the thermostat 4-2, the system discards solar power. This achieves the goal of direct heating during the day and utilizing the thermal energy stored in the pebble layer 8-5 during the day to heat the room at night, thus constituting a photovoltaic-driven double-layer electric heating film floor radiant heating system capable of meeting the continuous heating needs throughout the day.

[0017] The minimum temperature of thermostat 4-1 is 18℃, the maximum temperature of thermostat 4-1 is 20℃, and the maximum temperature of thermostat 4-2 is 30℃. When the indoor temperature is below 18℃, the solar photovoltaic module 1 starts to work and supplies power to the electric heating film 5-1. When the indoor temperature is above 20℃, the electric heating film 5-1 is de-energized, and the solar photovoltaic module 1 supplies power to the electric heating film 5-2. When the indoor temperature is above 30℃, the system wastes solar power. When the solar photovoltaic module 1 supplies power to the electric heating film 5-1 but the indoor temperature does not reach 18℃, the electric heating film 5-1 is connected to the municipal power supply 3 to meet the continuous heating needs throughout the day.

[0018] The thermostat 4-1 has a built-in thermostat probe 7-1 for sensing the indoor temperature and feeding it back to the thermostat 4-1; the thermostat 4-2 has a built-in thermostat probe 7-2 for sensing the indoor temperature and feeding it back to the thermostat 4-2.

[0019] The electric heating film 5-1 is 0.4 mm thick and is laid on the pebble layer 8-5. A protective layer 8-6 is laid on the electric heating film 5-1 for heat preservation and insulation. When the electric heating film 5-1 is powered on, it generates heat and provides warmth. The heat is directly transferred upwards to the room to meet the demand for rapid temperature rise during the day.

[0020] The electric heating film 2 5-2 is 0.4mm thick and is laid on the insulation layer 8-2. Before laying the electric heating film 2 5-2, a 4mm thick reflective film 8-3 needs to be laid to prevent heat loss downward and improve the reflective radiation capability. At the same time, a protective layer 1 8-4 needs to be laid on the electric heating film 2 5-2 for heat preservation and isolation. It is intermittently powered to generate heat and uses a 150mm thick pebble layer 8-5 to store heat so that heat can be continuously released into the room at night.

[0021] The indoor floor consists of, from bottom to top, a moisture-proof layer 8-1, a heat-insulating layer 8-2, a reflective layer 8-3, an electric heating film 2 5-2, a protective layer 1 8-4, a pebble layer 8-5, an electric heating film 1 5-1, a protective layer 2 8-6, and a finishing layer 8-7.

[0022] The moisture-proof layer 8-1 and the heat insulation layer 8-2 are laid on the ground and at the boundary between the ground and the wall. On the basis of the heat insulation layer 8-2, the deep electric heating film 5-2 is laid. First, the reflective layer 8-3 is laid, then the electric heating film 5-2 is laid, and finally the protective layer 8-4 is laid. On the protective layer 8-4, the pebble layer 8-5 is laid for heat storage during the day and heat dissipation at night. On the pebble layer 8-5, the shallow electric heating film 5-1 is laid, and the electric heating film 5-1 only needs to be covered with the protective layer 8-6. Finally, the finishing layer 8-7 is laid.

[0023] The beneficial effects of this invention are:

[0024] This invention utilizes a photovoltaic-driven double-layer electric heating film floor radiant heating system. It uses only solar energy during operation, producing no pollution and is energy-efficient and environmentally friendly. A thermostat precisely monitors the indoor temperature and feeds it back to the controller, enabling efficient system control. The system employs a combination of shallow and deep electric heating films for floor radiant heating. The shallow heating film rapidly heats up to meet daytime heating needs, while the intermittently heating deep heating film, combined with a pebble layer that stores daytime heat, meets nighttime heating needs, achieving a novel low-temperature radiant electric heating system that meets the continuous 24-hour heating requirements of remote villages and towns during winter. It boasts good stability, simple structure, convenient installation, and high efficiency. Actively responding to the call for energy conservation, emission reduction, and green development, it generates significant economic value. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 This is a detailed diagram of the system control.

[0027] Figure 3 This is a diagram of the ground structure layer for laying electric heating film.

[0028] The numbers in the diagram represent: 1-Solar photovoltaic module, 2-Solar inverter integrated machine, 3-Municipal power supply, 4-1-Thermostat one, 4-2-Thermostat two, 5-1-Electric heating film one, 5-2-Electric heating film two, 6-1-Controller, 6-2-Switch one, 6-3-Switch two, 6-4-Switch three, 7-1-Thermostat probe one, 7-2-Thermostat probe two, 8-1-Moisture-proof layer, 8-2-Insulation layer, 8-3-Reflective layer, 8-4-Protective layer one, 8-5-Pebble layer, 8-6-Protective layer two, 8-7-Surface layer. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the embodiments.

[0030] like Figure 1 As shown, the present invention provides a photovoltaic-driven photovoltaic electric heating film floor radiant heating system, including a photovoltaic power generation system and an electric heating film floor radiant heating system. The photovoltaic power generation system includes a solar photovoltaic module 1 and a solar inverter integrated machine 2. The electric heating film floor radiant heating system includes a thermostat 4-1, an electric heating film 5-1, a thermostat 4-2, and an electric heating film 5-2.

[0031] The working idea of ​​this invention is to combine the embedding depth of the electric heating film with the building's own heat storage and heating characteristics to form a new heating mode that allows for rapid heating during the day and utilizes the daytime heat storage for heating at night.

[0032] The electricity generated by the solar photovoltaic module 1 is supplied to the double-layer electric heating film floor radiant heating system via the solar inverter integrated machine 2 and controller 6-1. The electricity is then supplied to the electric heating film 5-1 via switch 6-3 and thermostat 4-1 to generate heat. The heat is directly dissipated into the room to meet the daytime heating needs. The electric heating film 5-2 generates heat intermittently, which is transferred to the pebble layer 8-5 and stored therein. At night, the heat is dissipated into the room to meet the basic nighttime heating needs as much as possible, thereby achieving the goal of continuous heating of the building without an energy storage system.

[0033] Thermostat probe 1 7-1 is built into thermostat 1 4-1, senses the indoor temperature and feeds it back to thermostat 1 4-1; thermostat probe 2 7-2 is built into thermostat 2 4-2, senses the indoor temperature and feeds it back to thermostat 2 4-2. In the morning, switch 2 (6-3) is on, and the electricity generated by solar photovoltaic module 1 can power electric heating film 1 (5-1) through solar inverter integrated machine 2 and controller 6-1. When controller 6-1 receives feedback 1 from thermostat 4-1 that the indoor temperature reaches 20℃, switch 2 (6-3) is turned off, electric heating film 1 (5-1) stops working, switch 3 (6-4) is turned on, and electric heating film 2 (5-2) starts working. When controller 6-1 receives feedback 2 from thermostat 4-2 that the indoor temperature reaches 30℃, electric heating film 2 (5-2) stops working, and the system wastes solar power. When controller 6-1 does not receive feedback 3 from thermostat 4-1 that the indoor temperature reaches 18℃, it indicates that solar photovoltaic module 1 cannot meet the heating demand of electric heating film 1 (5-1). At this time, switch 1 (6-2) is turned on to connect to municipal power supply 3 to power electric heating film 1 (5-1) to ensure the indoor heating needs during the day and to increase heat storage as much as possible to meet the basic heating needs at night, ultimately achieving the need for continuous indoor heating throughout the day without the energy storage system.

[0034] Combination Figure 3 Electric heating film 1 (5-1) is laid at a shallow depth, which can quickly generate heat and meet the indoor heating needs during the daytime; electric heating film 2 (5-2) is laid at a deeper depth and has a pebble layer (8-5) laid as a heat storage body, which can achieve more heat storage during the daytime and meet the indoor heating needs at night as much as possible.

[0035] The indoor floor structure layers, from bottom to top, are: moisture-proof layer 8-1, heat insulation layer 8-2, reflective layer 8-3, electric heating film II 5-2, protective layer I 8-4, pebble layer 8-5, electric heating film I 5-1, protective layer II 8-6, and finishing layer 8-7.

[0036] Combination Figure 3 Since there are many single-story buildings in remote areas, the ground is in direct contact with the soil, so a moisture barrier layer 8-1 needs to be laid first. Secondly, in order to prevent heat from being transferred downwards and reduce the ineffective heat loss of the structural layer, extruded polystyrene boards are laid in an alternating manner as an insulation layer 8-2. In addition, a moisture barrier layer 8-1 and an insulation layer 8-2 also need to be laid at the boundary between the ground and the wall.

[0037] Combination Figure 3After the insulation layer 8-2 is laid, the electric heating film 2 5-2 is laid: First, in order to prevent heat loss from the ground and effectively improve the heat reflection and radiation capacity, a reflective film needs to be laid as the reflective layer 8-3 of the electric heating film 2 5-2 before laying the electric heating film 2 5-2; Next, the electric heating film 2 5-2 is laid flat in parallel, with a gap of more than 10mm between the electric heating films and a gap of more than 100mm between it and the walls and other objects. The electric heating films are connected with T-shaped cables, and the temperature control probe 7-2 is fixed and connected to the temperature controller 2 4-2; After the electric heating film 2 5-2 is laid, a protective film needs to be laid as the protective layer 8-4 of the electric heating film 2 5-2; Finally, a pebble layer 8-5 is laid as the indoor heat storage layer.

[0038] Combination Figure 3 After the pebble layer 8-5 is laid, the electric heating film 1 5-1 is laid, and the laying method is the same as that of the electric heating film 2 5-2. Similarly, a protective film is needed as a protective layer 2 8-6; finally, the finishing layer 8-7 is laid.

[0039] An operation method for a photovoltaic-driven double-layer electric heating film floor radiant heating system suitable for continuous building heating includes the following steps:

[0040] In the initial state, controller 6-1 is powered on, switch 2 6-3 is on, and switch 1 6-2 and switch 3 6-4 are off.

[0041] The electricity generated by the solar photovoltaic module 1 is supplied to the double-layer electric heating film floor radiant heating system through the solar inverter integrated machine 2 and controller 6-1. The electricity is then supplied to the electric heating film 5-1 through switch 2 6-3 and thermostat 4-1 to generate heat. The heat is directly dissipated into the room to meet the daytime heating needs. The electric heating film 5-2 generates heat intermittently, and the heat is transferred to the pebble layer 8-5. Because the pebbles have poor thermal conductivity, they absorb the heat generated by the electric heating film 5-2 and dissipate it slowly. They have strong heat retention, so the heat is stored in the pebble layer 8-5. At night, the heat is dissipated into the room to meet the basic heating needs at night as much as possible, thereby achieving the goal of continuous heating of the building without an energy storage system.

[0042] Thermostat probe 1 7-1 is built into thermostat 1 4-1, sensing the indoor temperature and feeding it back to thermostat 1 4-1; thermostat probe 2 7-2 is built into thermostat 2 4-2, sensing the indoor temperature and feeding it back to thermostat 2 4-2. In the morning, switch 2 6-3 is in the open state, and the electrical energy generated by solar photovoltaic module 1 can power electric heating film 1 5-1 through solar inverter integrated machine 2 and controller 6-1; when controller 6-1 receives feedback from thermostat 1 4-1 that the indoor temperature reaches 20℃, switch 2 6-3 is turned off, electric heating film 1 5-1 stops working, switch 3 6-4 is turned on, and electric heating film 2 5-1... -2 Start working; When controller 6-1 receives feedback 2 from thermostat 4-2 that the indoor temperature reaches 30℃, electric heating film 5-2 stops working and the photovoltaic power generation system wastes light; When controller 6-1 does not receive feedback 3 from thermostat 4-1 and the indoor temperature reaches 18℃, it means that the solar photovoltaic module 1 cannot meet the heating demand of electric heating film 5-1. At this time, switch 6-2 is turned on to connect to the municipal power supply 3 to supply power to electric heating film 5-1 to ensure the indoor heating needs during the day and to increase heat storage as much as possible to meet the basic heating needs at night, and finally achieve the need for continuous indoor heating all day without the energy storage system.

[0043] The present invention includes both a shallowly laid electric heating film 5-1 and a deeply laid electric heating film 5-2, and sets the temperature controller 4-1 to a minimum of 18°C ​​and a maximum of 20°C, and sets the temperature controller 4-2 to a maximum of 30°C. The solar photovoltaic module 1 absorbs solar energy to provide power to the system. When the indoor temperature is below 18℃, the solar photovoltaic module 1 starts to work and supplies power to the electric heating film 5-1, which quickly heats up to increase the indoor temperature. When the indoor temperature is above 20℃, the solar photovoltaic module 1 stops supplying power to the electric heating film 5-1 and supplies power to the electric heating film 5-2. The electric heating film 5-2 generates heat and stores the heat in the pebble layer 8-5. When the indoor temperature is above 30℃, the electric heating film 5-2 stops working, and the system wastes solar energy. When the solar photovoltaic module 1 cannot achieve the effect of reaching an indoor temperature of 18℃ by supplying power to the electric heating film 5-1, the electric heating film 5-1 is connected to the municipal power supply 3 to meet the winter heating needs. This achieves the purpose of continuous building heating by alternating operation of shallow and deep electric heating films without an energy storage system.

Claims

1. A photovoltaic-driven double-layer electric heating film floor radiant heating system suitable for continuous building heating, characterized in that, This includes photovoltaic power generation systems and double-layer electric heating film floor radiant heating systems; The photovoltaic power generation system is used to absorb solar energy and convert it into electrical energy to power the double-layer electric heating film floor radiant heating system. The double-layer electric heating film floor radiant heating system is used to transfer heat energy to the outside in the form of far-infrared radiation and convection to increase the indoor temperature. The system employs a double-layer electric heating film, consisting of a shallow electric heating film (5-1) and a deep electric heating film (5-2), which alternately operates during the day to meet the continuous heating needs throughout the day. When the indoor temperature is lower than the minimum set temperature of the thermostat (4-1), the electric heating film (5-1) rapidly heats up and radiates heat through the decorative layer (8-7) to meet the heating needs. When the indoor temperature is higher than the maximum set temperature of the thermostat (4-1), the electric heating film (5-1) is de-energized, the electric heating film (5-2) is energized to generate heat, and the pebble layer (8-5) stores thermal energy. When the indoor temperature is higher than the maximum set temperature of the thermostat (4-2), the system discards sunlight. This achieves the goal of direct heating during the day and utilizing the thermal energy stored in the pebble layer (8-5) during the day to heat the room at night, thus constituting a photovoltaic-driven double-layer electric heating film floor radiant heating system capable of meeting the continuous heating needs throughout the day. The first electric heating film (5-1) is 0.4 mm thick and is laid on the pebble layer (8-5). The second protective layer (8-6) is laid on the first electric heating film (5-1) for heat preservation and isolation. When the electric heating film (5-1) is powered on, it generates heat and provides warmth. The heat is directly transferred upward to the room to meet the demand for rapid heating during the day. The second electric heating film (5-2) is 0.4 mm thick and is laid on the insulation layer (8-2). Before laying the second electric heating film (5-2), a 4 mm thick reflective layer (8-3) needs to be laid to prevent heat loss downward and improve the reflective radiation capability. At the same time, a protective layer (8-4) needs to be laid on the second electric heating film (5-2) for heat preservation and isolation of the second electric heating film (5-2). It is intermittently powered to generate heat and uses a 150 mm thick pebble layer (8-5) to store heat so that heat can be continuously released into the room at night.

2. The photovoltaic-driven double-layer electric heating film floor radiant heating system suitable for continuous building heating according to claim 1, characterized in that, The double-layer electric heating film floor radiant heating system includes a thermostat one (4-1), an electric heating film one (5-1), a thermostat two (4-2), and an electric heating film two (5-2). The electric heating film one (5-1) is laid in a shallow layer on the indoor floor, and the electric heating film two (5-2) is laid in a deep layer on the indoor floor. A pebble layer (8-5) is laid on the protective layer one (8-4) of the electric heating film two (5-2) for daytime heat storage and nighttime heat dissipation. The electrical energy generated by the solar photovoltaic module (1) is transmitted to the double-layer electric heating film floor radiant heating system through the solar inverter integrated machine (2). The thermostat one (4-1) supplies power to the electric heating film one (5-1) to generate heat and increase the indoor temperature, or the thermostat two (4-2) supplies power to the electric heating film two (5-2) to generate heat and uses the pebble layer (8-5) to store thermal energy.

3. A photovoltaic-driven double-layer electric heating film floor radiant heating system suitable for continuous building heating according to claim 1, characterized in that, The minimum temperature of thermostat one (4-1) is 18℃, the maximum temperature of thermostat one (4-1) is 20℃, and the maximum temperature of thermostat two (4-2) is 30℃. When the indoor temperature is below 18℃, the solar photovoltaic module (1) starts to work to supply power to the electric heating film one (5-1). When the indoor temperature is above 20℃, the electric heating film one (5-1) is de-energized, and the solar photovoltaic module (1) supplies power to the electric heating film two (5-2). When the indoor temperature is above 30℃, the system abandons solar power. When the solar photovoltaic module (1) supplies power to the electric heating film one (5-1) but the indoor temperature does not reach 18℃, the electric heating film one (5-1) is connected to the municipal power supply (3) to meet the continuous heating needs throughout the day. The thermostat one (4-1) has a built-in thermostat probe one (7-1) for sensing the indoor temperature and feeding it back to the thermostat one (4-1); the thermostat two (4-2) has a built-in thermostat probe two (7-2) for sensing the indoor temperature and feeding it back to the thermostat two (4-2).

4. A photovoltaic-driven double-layer electric heating film floor radiant heating system suitable for continuous building heating according to claim 1, characterized in that, The indoor floor, from bottom to top, consists of a moisture-proof layer (8-1), an insulation layer (8-2), a reflective layer (8-3), an electric heating film II (5-2), a protective layer I (8-4), a pebble layer (8-5), an electric heating film I (5-1), a protective layer II (8-6), and a finishing layer (8-7). The moisture-proof layer (8-1) and the heat insulation layer (8-2) are laid on the ground and at the boundary between the ground and the wall. On the basis of the heat insulation layer (8-2), the second deep electric heating film (5-2) is laid. First, the reflective layer (8-3) is laid, then the second electric heating film (5-2) is laid, and finally the first protective layer (8-4) is laid. On the top of the first protective layer (8-4), the pebble layer (8-5) is laid for heat storage during the day and heat dissipation at night. On the basis of the pebble layer (8-5), the first shallow electric heating film (5-1) is laid, and the first electric heating film (5-1) only needs to be covered with the second protective layer (8-6). Finally, the finishing layer (8-7) is laid.

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