Heat Pumps Fraser Gibson

Objective To convey a basic understanding of different types of heat pumps Discuss advantages/disadvantages of heat pumps

What is a heat pump? A large scale refrigerator that “pumps” heat from either: –The ground –A water source –The air Two Basic Modes –Heating Mode –Cooling Mode

Types of Heat Pumps Air Source Heat Pump Ground Source Heat Pump –Open Loop –Closed Loop

Air Source Heat Pumps Heating Mode –Moves heat from outside to inside of home –Requires a back up heat source –Effective at fall/early winter temperatures Cooling Mode –Moves heat from inside to outside of home –Same function as a refrigerator

Ground Source Heat Pump Refrigerant is run through pipes buried in ground Uses the warmer/colder ground to heat/cool home Horizontal Pipes buried 2 m deep Spread over large area of ground Vertical Pipes buried vertically about 50 m deep Works same way as vertical system Good for applications where space is an issue

Ground Source Heat Pump

Water Source Heat Pump Open Loop –Pipes submerged in well, lake, or river –Water from source is drawn through refrigerant system and then emitted in another well or back into lake/river –Uses the same principles as other systems Closed Loop –Refrigerant solution is run through loops of pipe submerged in water

Water Source Heat Pumps

Advantages of Heat Pumps Very efficient Cut heating bills by 60%(ground/water source) 30% (air source) Cut water heating bills by 50% Payback time of 2-6 years

Disadvantages Expensive Takes up large amount of space Not practical in some situations

Conclusion Main Concepts –Heat Pump Basics –Different Types of Heat Pumps

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