in domestic refrigerators what is the type of condenser used
A refrigerator uses a sealed container of liquid refrigerant to absorb heat, which it then transfers to the evaporator in the condenser.
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The cooled refrigerant is then compressed and liquefied, and passes through a metering device in order to remove some of the heat.
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The vapors are sent back into the sealed container where they are mixed with more liquid refrigerant and put back into service (or pumped out for service elsewhere).
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The use of natural gas as a supplementary heating source evolved because electric resistance coils do not work well on larger machines.
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A generator is also used if electricity fails. In both cases natural gas provides backup power for maintaining temperatures inside the unit within an acceptable range during power loss, or interruption.
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The fluid used for cooling refrigerators is a combination of ammonia and water supported by a small amount of urea.
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The ammonia and urea react to release heat, which then is absorbed by the water. For example, if the temperature drops below 32 °F (0 °C), the ammonia turns into an ammoniacal solution that vaporizes.
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If the machine is turned on with low liquid level in its evaporator or condenser, the excess refrigerant will be expelled into the surrounding air, or possibly even may leak out; this will keep the inside temperature cool.
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As a sealed system, it can be opened only by draining off all or part of its contents and installing a new booster pump. Should it be necessary to add fluid, the operator must first remove and dispose of all traces of oil.
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The refrigeration system consists of two main components, a compressor (compressor) and a condenser. The compression process is responsible for the conversion of a high pressure and low temperature refrigerant into a low pressure and high temperature refrigerant in order to make it evaporate at low pressures.
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The condensation process is responsible for the opposite operation, i.e., the conversion of the hot high pressure gas into a cold low pressure liquid phase in order to maintain its function as a heat transfer agent.
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In large refrigeration systems, these two processes are added to by other components, namely the booster pump (a combination of a pressure reduction valve and a liquid pump to keep the system operating), expansion valves (which convert high pressure gas into low pressure gas), service valves (which are added between pressure reducing valves and evaporators in order to control the refrigerant flow within the system) and liquid receivers (which compensate for any possible losses due to leaks).
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The key component of this apparatus is the compressor. The compressor works as follows: A low pressure, especially warm vapor is cooled at constant volume in an evaporator. Afterwards, it passes through a throttling device which reduces its temperature.
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Because all refrigerants boil at a constant, low temperature, the un-cooled vapor then passes through a metering device.
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This device monitors the pressure of the refrigerant and when the pressure is below some threshold value, it opens and allows part of the vapor to flow through a valve onto a compressor where it is compressed and cooled.
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The compressor then sends warm low pressure liquid back into the evaporator to be recompressed at high pressure again by the expansion valve.The condenser works in reverse: The condensate coming from the evaporator is at high temperature and pressures (partly even with superheated vapor) and is compressed by the compressor into low pressure liquid for storage in a tank or manifold.
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