Cold chain logistics has always been a new hot in modern society, bringing great convenience to production and life. As a major model of cold chain logistics, transportation refrigeration units should have the design of the car structure in addition to the national standards of the whole vehicle. Moderate strength and stiffness, lightweight design, simple process, serialization, generalization and standardization, good thermal insulation performance and ease of use, maintenance and maintenance. So what are the materials for the good transport refrigeration unit?
First, the insulation layer material and thickness:
Requirements for insulation materials
(1) Uniform foaming and low density;
(2) The thermal conductivity is as small as possible, generally required to be below 0.045w/(m2K);
(3) The stability to temperature changes is good, and the performance should meet the specified requirements within the operating temperature range of -40 to 70 °C.
(4) It has a certain mechanical strength and can withstand the vibration and impact of small transport refrigeration units under bad road conditions without damage or deformation.
(5) Low water absorption and hygroscopicity, corrosion resistance. Good frost resistance,
(6) It is non-toxic and tasteless, and has low gas permeability. When using and burning heat-insulating materials, it shall not decompose toxic and harmful gases;
(7) The price is low and easy to form, and the insulation layer of the small transport refrigeration unit can be formed by filling, pouring and spraying.
Second, the type of insulation materials:
At present, the commonly used small transport refrigeration unit compartment insulation materials mainly include polystyrene foam and polyurethane foam. The polystyrene foam is a foamed material of a microporous honeycomb structure obtained by heating and pre-baking the expandable polystyrene particles containing a low-foam liquid foaming agent in a mold.
Knowing the material of the transport refrigeration unit can better purchase the transport refrigeration unit.
