Heat Pumps

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Heat Pumps

• Fraser Gibson

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Objective

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

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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

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Types of Heat Pumps

• Air Source Heat Pump
• Ground Source Heat Pump
• Open Loop
• Closed Loop

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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

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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

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Ground Source Heat Pump
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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

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Water Source Heat Pumps
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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

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Disadvantages

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

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Conclusion

• Main Concepts
• Heat Pump Basics
• Different Types of Heat Pumps

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References

• http//www.bchydro.com/powersmart/elibrary/elibrar
  y685.html
• http//www.hydroonenetworks.com/en/efficiency/heat
  ing_cooling/heat_pumps/