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Heat Pump

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by

Jemimah Baidya

on 20 April 2016

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Transcript of Heat Pump

Heat Pump
What is a heat pump?
A heat pump is an electrical device that transfers heat from one place and extracts it to another. It can be reversed to either heat or cool a controlled space. It consists of two units: 1. Indoor unit; the air handler and 2. Outdoor unit which is similar to an air conditioner.

Examples: Refrigerators and air conditioners.
How does it work?
A heat pump is essentially like an air-conditioner but can also heat our homes during winter. It pumps heat out of our homes in summer and into our homes during winter.

Five main components:
Evaporator
condenser
compressor
expansion device
Refrigerant (working fluid)
The most common type of heat pump is called an air- source heat pump. Which helps to transfer heat between the house and outside air.

High efficiency heat pumps are better dehumidifiers than standard central air-conditioners.




The heat pump extracts the outside air and transfers it to either inside or the outside of our homes depending on the season. The air source heat pump has 3 cycles:
1. The heating cycle- heat is pumped indoors
2. The cooling cycle-takes heat out of the indoor air
3. The defrost cycle- the heat pump is switched to defrost mode.
In conclusion
Heat pumps are somewhat ineffective in climates where the temperature falls near or below freezing as this requires more energy to transfer heat from an extremely cold area to a hotter one. Resulting in mild heat.

Heat pumps are great in the summer as they are better dehumidifiers than air-conditioners as they have larger flat returning coils than air conditioners.




Bibliography
http://www.industrialheatpumps.nl/en/how_it_works/
http://energy.gov/energysaver/heat-pump-systems
http://www.nrcan.gc.ca/energy/publications/efficiency/heating-heat-pump/6831
http://www.prostar-mechanical.com/heatpump/howheatpumpswork.htm
http://home.howstuffworks.com/home-improvement/heating-and-cooling/heat-pump4.htm
Full transcript