Silicone rubber heating belt--electrical heat energy and calculation

If it is a pure resistance circuit:

Because it is almost a pure resistance circuit, the formula is P=VI. Lithium battery heaters have basic functions, such as heating, constant temperature, and temperature control. Cabinet dehumidification heaters In recent years, due to the greenhouse effect, the temperature has risen year by year, and the atmospheric environmental factors have gradually deteriorated. The variable climate, such as high temperature and high humidity, has made the threats faced by indoor power distribution facilities more and more obvious. The 3D printer heating sheet uses a layered stacking method to produce a three-dimensional model. Its operation process is similar to that of a traditional printer, except that the traditional printer prints ink on paper to form a two-dimensional plane drawing, while the 3D printer stacks liquid photosensitive resin materials, molten plastic filaments, gypsum powder and other materials by spraying adhesives or extrusion to form a three-dimensional entity.

If it is not a pure resistance circuit:

1. First, it is necessary to determine the heating time (H) and the temperature difference (degrees). From how many degrees to how many degrees, this parameter is very important. If the time requirement is very short, the required heating power may be very large, wasting energy. If the time is long, the equipment preparation time is long, and a balance point is required.

2. The volume of air in the main equipment (cubic meters), including the air passing through the pipes, is estimated and analyzed.

3. The specific gravity of air is 1.16 (kg/m3), and the specific heat is 0.24 kcal/kg ° c.

4. The heating efficiency is generally 0.5~0.6.

Calculate according to the following basic formula: Heating system power (KW) = (volume X specific gravity X specific heat X temperature difference) / (860X heating time X efficiency).

The calculation formula of the electric heat energy of an object: electric heat Q = I^2RT = IUT = Pt

Among them, the voltage symbol U, the current symbol I, and the resistance symbol R, R are called the resistivity or resistivity of the object. It is related to the material of the object, and the value is equal to the resistance value per unit length and per unit area of ​​the object at 20 degrees Celsius.

Resistivity of common conductors

Resistivity of common conductor materials (?)? Ω? M) At 20℃

Silver 0.016 Copper 0.0172 Gold 0.022 Aluminum 0.029 Zinc 0.059 Iron 0.0978 Lead 0.206