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Answer :
Final answer:
Anyone who recovers refrigeration during maintenance, service, or repair of small appliances must be certified as either a universal Tech or an Advanced Tech.
Explanation:
Anyone who recovers refrigeration during maintenance, service, or repair of small appliances must be certified as either a universal Tech or a: Advanced Tech.
The mission of air conditioners and refrigerators is for heat transfer Qc to occur from a cool environment, such as chilling a room or keeping food at lower temperatures than the environment. There is an entire branch of physics, called thermodynamics, that deals with heat and temperature and forms the basis for technologies such as refrigeration.
A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Te and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work Wis done on the engine's working substance. A household refrigerator removes heat from the food within it while exhausting heat to the surrounding air. The required work is performed by the motor that moves a coolant through the coils.
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