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There are many manufacturers of pharmaceutical heating and cooling devices on the market, and the cooling methods used by the equipment of different manufacturers are different.
So, what are the common cooling methods? 1.
Compressed air refrigeration cycle
.
Because air constant temperature heating and constant temperature heat removal are not easy to achieve, they cannot operate in reverse cycle.
In compressed air refrigeration cycle, two constant pressure processes are used to replace the two constant temperature processes of reverse cycle, so it can be considered as reverse cycle, In engineering applications, compressors are available in piston or impeller type
.
2.
Compressed vapor refrigeration cycle
.
The reverse refrigeration cycle of compressed vapor is theoretically possible, but it is too dry and too low to be conducive to the compression of two-phase substances
.
In order to avoid unfavorable factors, improve refrigeration efficiency, and simplify equipment, throttle valves (or expansion valves) are often used instead of expanders in practical applications
.
The compressed vapor refrigeration cycle uses low-boiling substances as refrigerants, and uses the constant pressure and constant temperature characteristics of the wet vapor area to vaporize and absorb heat at low temperatures, which overcomes some of the above-mentioned shortcomings of the compressed air and regenerated compressed air cycles
.
3.
Absorption refrigeration cycle
.
The absorption refrigeration cycle utilizes the characteristics of different solubility of refrigerants at different temperatures in the solution, so that the refrigerant is absorbed by the absorbent (ie solvent) at a lower temperature and pressure, and at the same time evaporates from the solution at a higher temperature and pressure, So as to complete the cycle and achieve the purpose of refrigeration
.
So, what are the common cooling methods? 1.
Compressed air refrigeration cycle
.
Because air constant temperature heating and constant temperature heat removal are not easy to achieve, they cannot operate in reverse cycle.
In compressed air refrigeration cycle, two constant pressure processes are used to replace the two constant temperature processes of reverse cycle, so it can be considered as reverse cycle, In engineering applications, compressors are available in piston or impeller type
.
2.
Compressed vapor refrigeration cycle
.
The reverse refrigeration cycle of compressed vapor is theoretically possible, but it is too dry and too low to be conducive to the compression of two-phase substances
.
In order to avoid unfavorable factors, improve refrigeration efficiency, and simplify equipment, throttle valves (or expansion valves) are often used instead of expanders in practical applications
.
The compressed vapor refrigeration cycle uses low-boiling substances as refrigerants, and uses the constant pressure and constant temperature characteristics of the wet vapor area to vaporize and absorb heat at low temperatures, which overcomes some of the above-mentioned shortcomings of the compressed air and regenerated compressed air cycles
.
3.
Absorption refrigeration cycle
.
The absorption refrigeration cycle utilizes the characteristics of different solubility of refrigerants at different temperatures in the solution, so that the refrigerant is absorbed by the absorbent (ie solvent) at a lower temperature and pressure, and at the same time evaporates from the solution at a higher temperature and pressure, So as to complete the cycle and achieve the purpose of refrigeration
.
