Respuesta :
The liquid refrigerant must evaporate (change from a liquid to a gas) and cool. This process releases heat. The cool gas is pumped through tubes so that it can absorb heat from the interior of the refrigerator, keeping it away from the food. Then the gas must condense into a liquid so that it can release the absorbed heat to the outside and begin the cycle again.
The two changes of state of the refrigerant are necessary to operate a refrigerator because liquid refrigerant must evaporate and cool.
What is refrigerator?
A refrigerator is a heat engine in which work is done on a refrigerant substance in order to collect energy from a cold region and exhaust it in a higher temperature region, thereby further cooling the cold region.
What is liquid refrigerant?
The liquid refrigerant is used for heat transfer in a refrigeration system, which absorbs heat at a low temperature and low pressure and rejects heat at a higher temperature and a higher pressure.
Explain refrigeration cycle?
- This cycle is based on the process of changing the physical state of the liquid refrigerant (from liquid to gas and vice versa). These substances condense to liquid at high pressures and evaporate to gases) at low pressures.
- The cold in cooling systems happens due to the change of state of this liquid refrigerant fluid to gas.
- This process depends on the work done by the compressor – which uses mechanical energy to compress the liquid refrigerant from the evaporator in the gas phase.
- With this compression, the pressure and temperature of the liquid refrigerant increases. When it enters the condenser, the refrigerant transfer the heat to the environment, causing its temperature to decrease and condensation occurs, which is the process of phase change from gas to liquid.
- After that, the liquid refrigerant passes through the control element – capillary tube or expansion valve – which, by narrowing the passage, slows its speed on the evaporator, causing its pressure to decrease.
- The liquid refrigerant arrives on the liquid state and under low pressure to the evaporator, during which it is changing phase again, from liquid to gas. When you change phase, it absorbs the heat present in the conditioned items in the refrigerator case and returns to the compressor, restarting the refrigeration cycle.
The liquid refrigerant must evaporate (change from a liquid to a gas) and cool. This process releases heat. The cool gas is pumped through tubes so that it can absorb heat from the interior of the refrigerator, keeping it away from the food. Then the gas must condense into a liquid so that it can release the absorbed heat to the outside and begin the cycle again.
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