A. The Concept of Heat Pump
1) Heat pump is a device that uses mechanical energy to transfer heat from one place to another.
2) Heat pump works through reverse refrigeration cycle.
3) Heat pump can be used for heating or cooling, depending on the structure.
4) Under refrigeration mode, heat pump works as a refrigeration system.
5) There is a four-way valve in the refrigeration circuit for switching between heating mode and refrigeration mode.
6) Heat pumps can be used in space(room) heaters or water heaters.
7) Heat source can be found in the natural environment (like soil, air, groundwater, etc.)
B. Efficiency of heat pump
Coefficient of performance (COP)
The performance coefficient of heat pump can be defined as the ratio of heat output to power input.
For example, if COP is 4, it means that 1kw of electric energy plus 3kw of thermal energy produces 4kw of thermal energy output.
Question: Why heat pump more efficient than traditional heating equipment?
1) Thermal energy in soil and air is completely free.
2) It is found naturally in the soil and is often supplemented by wind, sunlight and rainfall.
3) 3/4 of the energy that heat pump provide annually for space heating and domestic hot water comes from sunlight and is stored in soil or air.
4) 44% of the solar energy received on Earth is eventually stored in the soil.
5) The solar energy is 480 times the total human energy demand on Earth.
6) Heat pump is clean source and renewable solar energy, which helps create good environment.
7) Heat pump combine with high efficient heating system, and install by good installer, that can reduce heating cost by more than 50%.
8) Compared with oil-fired boilers, typical heat pump systems have great advantages in environmental.
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