In your kitchen refrigerator, this working fluid is a hydrochlorofluorocarbon chemical that's usually referred to generically as freon.However the refrigerant used in Heli ultra-low temperature freezer is mixed with CFC free chemical refrigerant,It is a combination of several refrigerants with different boiling points,the advantage of this refrigerant is that it is safe and environmentally friendly.The four steps of the refrigeration cycle of a refrigerator are described as follows:
The first stage of the cycle is the evaporator, which removes heat from the inside of the fridge. It starts out with liquid fluid that's colder than the inside of the fridge, which is the result of the last stage of the previous cycle. So, this liquid is really cold, but its boiling point is also really low. In fact, the liquid is just about at the temperature where it's ready to boil. And when a liquid changes to a gas, it absorbs heat. So when the liquid in the evaporator boils, it absorbs heat from the refrigerator at the same time. But even though it's absorbing heat, its temperature doesn't actually change. All that heat energy is going into changing the liquid into a gas, not raising its temperature.
Stage two is the compressor. Its job is to raise the pressure of the gas, which also raises its temperature and its boiling point. After stage two is complete, the gas is really hotter than the air outside the fridge. But because its boiling point increased too, it's still around the temperature where it's ready to condense into a liquid.
Which brings us to stage three: the condenser, which is basically the opposite of the evaporator in stage one. In the condenser, the gas turns into a liquid, a process that releases heat. Since the refrigerant is now hotter than the air outside, heat can flow from inside the condenser to the surrounding air. But, like in the evaporator, the temperature of the refrigerant stays constant in the condenser.
Finally, in stage four, an expansion valve throttles the liquid, lowering its pressure and therefore, lowering both its temperature and boiling point. It's the opposite of what happens in the compressor. You end up with cold liquid refrigerant at a lower pressure, ready to enter the evaporator and start the process all over again, absorbing more heat from the fridge as it boils. So basically, the food inside your fridge stays cold because we're taking heat out from the inside of your refrigerator.
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