1, the thermal insulation lunch box mainly depends on the low heat exchange rate of porous materials, and uses the pores contained in the materials for thermal insulation, because the thermal conductivity of air or inert gas in the gaps is very low. Therefore, using this feature, you can wrap the insulated lunch box with fibrous or porous materials such as cotton cloth and towels.
2. You can put a layer of heat reflective material (high reflection coefficient, which can reflect heat, such as gold, silver, nickel, aluminum foil or metallized polyester, polyimide film, etc.). ) In the insulated lunch box. Generally speaking, aluminum foil (also known as tin foil) can reflect heat back. This can increase the insulation time of the insulated lunch box.
3. On the basis of the above, putting the lunch box in the incubator (that is, the foam box) can further reduce the heat exchange and improve the heat preservation time.
Thermal insulation structure:
The thermal insulation structure consists of anti-corrosion layer, thermal insulation layer and protective layer. The pipeline suffers from internal corrosion of medium and external corrosion of atmosphere and soil, which affects the normal operation and service life of the system.
Commonly used anticorrosive coatings for hot water pipelines include heat-resistant antirust paint and resin paint. Commonly used anticorrosive coatings for steel pipes include acid-resistant paint, enamel, ready mixed paint, asphalt paint, etc. The insulation layer is composed of thermal insulation materials, which is the main component of thermal insulation and the main body of thermal insulation structure.
The function of the protective layer is to prevent the insulation layer from being damaged by mechanical collision, prevent moisture from invading the insulation layer and reducing its performance, and beautify the appearance of the insulation pipe. The protective layer is made of metal or felt cloth. The metal protective layer can be made of galvanized steel plate, common thin steel plate and aluminum alloy plate.