Heating and cooling cycle device is a circulation device that provides heat and cold sources for reaction vessels, tanks, etc. It is a laboratory instrument and equipment with dual functions of heating and cooling, mainly used in the fields of chemical, pharmaceutical, and biological industries to match glass reaction vessels, rotary evaporators, fermentation tanks, calorimeters, etc; Widely used in research departments such as petroleum, metallurgy, medicine, biochemistry, physical properties, testing, and chemical synthesis, universities, factory laboratories, and metrology and quality inspection departments.
The principle of heating and cooling cycle device:
1. Compressed air refrigeration cycle
Due to the difficulty in achieving constant temperature heating and constant temperature heat dissipation in air, it cannot operate in reverse circulation. In the compressed air refrigeration cycle, two constant pressure processes are used instead of the two constant temperature processes of the reverse cycle, so it can be considered as the reverse cycle. In engineering applications, compressors can be piston or impeller type.
02. Compressed steam refrigeration cycle
The reverse refrigeration cycle of compressed steam can theoretically be achieved, but it is too dry and too low, which is not conducive to the compression of two-phase substances. In order to avoid adverse factors, improve refrigeration efficiency, and simplify equipment, throttle valves (or expansion valves) are often used instead of expansion machines in practical applications. The compressed steam refrigeration cycle uses low boiling point substances as refrigerants and utilizes the constant pressure or constant temperature characteristics of the wet steam zone to vaporize and absorb heat for refrigeration at low temperatures, overcoming some of the shortcomings of the compressed air and regenerated compressed air cycles mentioned above.
03. Absorption refrigeration cycle
The absorption refrigeration cycle utilizes the characteristic of different solubility of refrigerant in solution at different temperatures, allowing the refrigerant to be absorbed by the absorbent (i.e. solvent) at lower temperatures and pressures, while evaporating from the solution at higher temperatures and pressures, thus completing the cycle and achieving the purpose of refrigeration.