Electric heating films are divided into high temperature and low temperature electric heating films. High-temperature electric heating films are generally used in electronic appliances, military, etc. Today's electric heating films are produced by technology. The Graphene Floor Heating heating system is different from the point heating system represented by radiators, air conditioners and radiators, and the linear heating system represented by heating cables. It is a low-carbon heating high-tech developed by modern aerospace technology in the field of surface heating. product.

Introduction

Low-temperature electric heating film is a translucent polyester film that can generate heat when energized. It is made of conductive special ink and metal current-carrying strips, processed and hot-pressed between insulating polyester films. When working, the electric heating film is used as the heating element, and heat is sent into the space in the form of radiation, so that the human body and objects are warmed first. The overall effect is better than the traditional convection heating method. The low-temperature radiant electric heating film system consists of a power supply, a temperature controller, connectors, an insulation layer, an electric heating film and a facing layer. The power supply is connected to the electric heating film through wires to convert electrical energy into heat energy. Since the electric heating film is a pure resistance circuit, its conversion efficiency is high. Except for a small part of the loss (2%), most of it (98%) is converted into heat energy.

The electric heating film cannot be directly used for ground radiant heating. It needs to be added with a patented PVC vacuum envelope before it can be used for floor heating to ensure its effectiveness and lifespan.

Electric heating film has huge development potential and is in line with the development trend of low-carbon economy. The electric heating film heating method does not consume water, does not occupy an area, can be switched on and off independently, saves energy and materials, complies with the policy guidance of emission reduction and low carbon, and has broad development prospects. Some experts predict that the introduction of this technical standard will not only mean that environmentally friendly and economical electric heating film heating will enter thousands of households more quickly, but also mean the revitalization of the electric heating film heating industry and the coming of the spring of low-carbon development in the heating industry.

Classification

Electric heating films [1] can be divided into the following three categories according to their development stages and application modes:

(1) Electric heating film: the first generation of electric heating film, laid on the roof;

(2) Electric heating wall film: The second generation electric heating film is laid on the wall;

(3) Electric heating film: The third generation electric heating film is laid on the ground. Compared with the first two generations of electric heating films, the third generation of electric heating films has unique advantages such as simple construction, uniform heating, and health care (foot warm and head cool, in line with health science).

The most common specifications of electric heating film are classified according to appearance and shape: 50cm width, 80cm width, and 100cm width.

Electric heating films generally have two specifications according to power: 220 watts per square meter, 400 watts per square meter, and 220 watts per square meter. Electric heating films are low-temperature electric heating films and are mainly used in the floor heating industry: 400 watts are mainly used for aspects other than floor heating, such as drying, etc. The 400-watt electric heating film is a high-temperature electric heating film with a maximum temperature of more than 70 degrees. It is used for printing drying, drug drying, etc.

Principle of heating

The principle of electric heating film heating is that under the action of an electric field, the carbon molecular groups in the heating element produce "Brownian motion". Severe friction and collision occur between the carbon molecules, and the generated heat energy is transferred to the outside in the form of far-infrared radiation and convection. , its conversion rate of electrical energy and thermal energy is as high as over 98%. The action of carbon molecules rapidly heats up the surface of the system. When the electric heating film heating system is installed on the wall (floor), the heat energy will be continuously and evenly transmitted to every corner of the room. The reason why the electric heating film can quickly heat up the space is that 100% of its electrical energy input is effectively converted into more than 66% of far-infrared radiation energy and 33% of convective heat energy.

Industry development

market disorder

Heating cable manufacturers rarely make a fuss about the categories of heating cables. What the relevant businesses deliberately highlight is either the difference between imported brands and domestic brands of heating cables, or the standard issue of electromagnetic radiation intensity of heating cables. Most heating cable merchants focus on product quality, price and after-sales service under the same rules of the game, forming relatively fair competition. The electric heating film industry is different. The recognized methods of electric heating film include "polymer, ink, carbon fiber, and metal wire (sheet)". In addition, there are many other methods such as "silicon crystal, carbon crystal, electric heating film, carbon, and ecology". Electric heating film, advertising slogans are even more diverse. Many of these merchants claim that their products are "first", "only" and "best", which reflects the disordered and chaotic development status of the electric heating film field. Just imagine, if you can't even understand or dare not understand the category of your product, or you can't let experts accurately characterize it, then it's incredible that these businesses will have several "initiatives" when promoting the application effects of their electric heating films.

Lack of norms

Although electric heating film electric floor heating has many advantages, there have been no relevant application regulations. In contrast, heating cables already have "Technical Regulations for Ground Radiant Heating" that all manufacturers must abide by. However, various electric heating film manufacturers can only adopt enterprise version application procedures or local application procedures. What is even more worrying is that most domestic electric heating film manufacturers do not have the conditions for floor heating system design and construction, and have not cooperated with relevant companies to study construction techniques and daily maintenance measures suitable for their products, but are eager to promote their products to floor heating. project. The technical directors of many companies even equate the leakage current of electric heating films with leakage, and ridiculously claim that their products are well insulated and have no leakage current. Some provincial-level electric heating film application standards under the control of electric heating film companies even explicitly stipulate that electric heating films can not be insulated, grounded, or protected from leakage current. As everyone knows, only a metal shielding structure formed on the surface of the electric heating film can be used for wet paving methods such as ceramic tiles and marble floors. After some electric heating film manufacturers launched self-limiting temperature products, many manufacturers also followed suit and promoted them. If so many potential safety hazards cannot be controlled by national industry standards as soon as possible, it may not be long before a chaotic situation similar to that of electric heating film ceiling heating occurs again, and its seriousness may be even worse. If this kind of problem occurs unfortunately, it will undoubtedly affect the reputation of the entire electric floor heating industry.