The incubator is a very common laboratory instrument, the main commonly used are: biochemical incubator , constant temperature and humidity incubator, carbon dioxide incubator, anaerobic incubator, mold incubator , light incubator , low temperature incubator and so on. The low-temperature incubator is also called the cryo-preservation box, which is a kind of test box that can refrigerate and preserve the normal low-temperature culture and storage of items. It is widely used in storage medium, serum, medicine, microbial culture and environmental test.
Principle of low temperature incubator
The refrigeration cycle of the low-temperature incubator adopts the reverse Karo cycle, which is composed of two isothermal processes and two adiabatic processes. The process is as follows:
The refrigerant is adiabaticly compressed by the compressor to reach a higher pressure, and the consumed power increases the temperature of the exhaust gas. After that, the refrigerant exchanges heat with the surrounding medium through the condenser isothermally and transfers the heat to the surrounding medium. After the refrigerant passes through the shutoff valve adiabatic expansion to perform work, at this time the temperature of the refrigerant decreases. Finally, the refrigerant absorbs heat isothermally from the higher temperature object through the evaporator, so that the temperature of the cooled object is lowered. This cycle is repeated to achieve the purpose of lowering the temperature.
The design of the refrigeration system applies energy adjustment technology, which can not only ensure the normal operation of the refrigeration unit, but also effectively adjust the energy consumption and refrigeration capacity of the refrigeration system to keep the refrigeration system in the best operating state. Using balanced temperature regulation (BTHC), that is, when the refrigeration system is continuously working, the control system controls the output of the heater through the PID automatic calculation output according to the set temperature point, and finally achieves a dynamic balance.
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5. Environment-friendly CFC-free Refrigerant R134a or R404a.
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