Application and Prospect of electrothermal film ra

Talking about the application and Prospect of electrothermal film radiant heating technology

Abstract: through the comparison of several heating technologies, this paper focuses on the characteristics, application and Prospect of electrothermal film radiant heating technology

key words: application prospect of electrothermal film heating electricity can further stop the design. The hot film radiant heating technology is a relatively new heating technology, which has only been developed in China in the past 7 or 8 years. Yongxing special steel is based on optimizing the stock. Electric heating film is a pure resistance heating body made of special conductive ink and metal current carrying strip printed and hot pressed between two layers of insulating polyester film, and then equipped with an independent adjustable temperature control device to form an electric heating heating system. 1 Comparison of heating methods at present, the main heating methods in China include coal-fired stove, gas stove, oil fired stove, electric boiler and electric heating film. See Table 1 for the comparison of the characteristics of the above-mentioned heating methods. Table 1 several heating parties the provincial government held a video conference and sent four emergency notices in succession. Comparison of heating methods pollution thermal efficiency overall cost service life (a) Economic value of operation and management costs coal-fired boilers are serious> 60% lower, more than 10 higher gas-fired boilers> 80% higher, less 10 higher, oil fired boilers are larger> 80% higher, less 15 lower than low electric boilers, 95% ~ 98% moderate, 15 less low electric heating film, 95% ~ 98% moderate, 30 no higher. In terms of indoor heat sources, they are divided into metal radiator type, low-temperature ground heating radiation type and electric heating film heat radiation type, See Table 2 for the comparison of their characteristics. Table 2 characteristics of several indoor heat sources comparison of heat sources indoor aesthetics human comfort floor area temperature controllable metal radiator type difference generally occupies indoor area uncontrollable low temperature ground heating heat radiation type is good comfort does not occupy indoor area controllable electric heating film heat radiation type is good comfort does not occupy indoor area controllable metal radiator as a traditional heat source has the advantages of low cost and mature technology, It is widely used by residential users. Low temperature ground heating and thermal radiation technology has been applied in developed countries as early as the 1930s. With the development of material technology, it has also been widely used in China in recent years. Low temperature ground heating heat radiation, so the tensile testing machine must accurately measure the strain of the sample in the rubber tensile test. It also uses hot water as the thermal medium, but its hot water temperature is lower than that required by the metal radiator. It embeds the cross-linked polyethylene plastic pipe (PEX pipe for short) in the ground cushion, and the heat is evenly radiated indoors through the floor, so that the human body can get the best feeling of warm feet and cool head, and does not occupy the indoor use area of residents. At present, its technology is also increasingly mature, and there are many projects applied in our district. Electrothermal film thermal radiation technology is a new type of heating technology. Its emergence is based on the sufficiency of electric energy and people's increasing attention to the environment. It has set off a revolution in the field of heating with its environmental protection, safety and comfort. It has been widely used in various buildings abroad. The power company in our district has recently introduced preferential electricity prices, which has also laid a certain foundation for its development in our district. 2 electric heating film thermal radiation heating technology 2.1 load calculation

electric heating film thermal radiation heating technology is to connect the electric heating diaphragm in parallel and bury it in the ceiling, wall and ground indoors. The connection between the sheets is made of special alloy materials, and the connection card is also attached with a plastic cover for insulation and protection. Each room has a thermostat, and the electric heating diaphragm of this room is finally connected to the thermostat, which is characterized by adjustable temperature. The electric load of electrothermal film technology can be calculated by the following formula: where: P - electric load of electrothermal film, W; K - operation coefficient, generally k=0.2; PM - calculated value of room heat load, W. Through the above formula, we can get the electrical load of each room and further calculate the total load. Generally speaking, the electric power of electric heating film required for each square meter of building area in our district is 50 ~ 75W. According to this calculation, the electric power required for each house to use electric heating film is nearly twice that of not using electric heating film, and the number of distribution circuits is increased by at least two. 2.2 there are probably two kinds of power supply and measurement methods in the design of residential buildings with electric heating film heating. First, single-phase household, single-phase measurement; Second, three-phase household, three-phase measurement. The following is a comparison between the two methods: A. single-phase household, single-phase measurement. Taking three types of residential buildings as an example, the national code for residential design (GB) stipulates that the electrical load standard is 4kw. If electrothermal membrane heating is used, the total load is about 7KW. According to the formula: P - active power calculation load, taking 7000W; U - rated phase voltage, 220V; cos φ— Average power factor, taken as 0.9. Then: i=35.4 (a) according to article 4.0.12 of code for design of power supply and distribution systems (GB): when the line current of single-phase power supply load is I 30a, the three-phase four wire system should be used for power supply. At present, the building area of most of the residential buildings developed in China has exceeded three categories, so there is a power supply design method that uses the electric heating film to separate the power consumption from the rest, that is, the electric heating film is measured and distributed separately