Heat pump:
A heat pump is a device which operating in a cyclic process to maintains the temperature of a hot body (heated space) at a temperature higher than the temperature of surrounding.
Basic Components of a Heat Pump:
- Condenser
- Expansion Valve
- Evaporator
- Compressor
In the outdoor coils (evaporator), heat transfer Qc occurs to the working fluid from the cold outdoor air which turning it into a gas. The electrically driven compressor (work input W ) raises the temperature and pressure of the gas, which forces it into the condenser coils that are inside the heated space. Due to the temperature of the gas is higher than the temperature inside the room, heat transfer to the room occurs and the gas condenses to a liquid. The liquid then flows back through a pressure-reducing valve to the outdoor evaporator coils, being cooled through expansion.
Coefficient of Performance (COP):
The performance of a heat pump is judged by how much heat transfer Qh occurs into the warm space compared with how much work input W is required.
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