HEAT PUMP

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HEAT PUMP

• Hassan Sarwar
• ME100
• 4M-10C
• Nov 1st, 2005

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Objective

• Objective of this presentation is to relate heat
  pump to mechanical engineering and how it works.

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What is it?

• A heat pump is a machine which takes heat from a
  low temperature reservoir to high temperature
  reservoir.

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Common examples of Heat Pump

• Gas compression heat pumps
• Phase change heat pumps
• Geothermal exchange heat pumps
• Vortex Tubes

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Gas Compression Heat Pumps

• Gas compression heat pumps are used to liquefy
  air to produce gases such as nitrogen, oxygen,
  argon for industrial purposes.

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Phase Change Heat Pumps

• The most common type of Heat pumps
• It is commonly used in refrigerators and air
  conditioners
• It takes a liquid, refrigerant, which has a low
  boiling point. The liquid requires energy to
  evaporate and it then drains that energy from
  surrounding in the form of heat. When the vapour
  condenses, it release that energy back in form of
  heat.

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Phase Change Heat Pumps

• This pump has two cycles.
• In first cycle, it changes to vapour form
• In next cycle, it changes back to liquid form
• This process is called refrigeration cycle.
• The liquid,used is used to be CFC, but due to
  damage to ozone layer by CFC, now the liquid is
  R-13a but sometimes ammonia is also used.

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Geothermal Exchange Heat Pumps

• Geothermal exchange heat pumps is also known as a
  ground source heat pump.
• It is a heat pump that uses Earth as either the
  heat source or heat sink, depends on the mode of
  operation.
• This type of heat pumps are either closed or open
  system and consisted of a loop, a compressor and
  a pump.

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Geothermal Exchange Heat Pumps

• In closed system, a fluid is circulated and this
  fluid is never able to leave the system.
• This fluid is usually the water but it could be
  an antifreeze such as denatured ethanol, or
  methanol.
• In open system, the fluid moves one place to
  another and it either removes the heat or add the
  heat

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Vortex Tubes

• Vortex Tubes are special kind of heat pumps with
  no moving parts
• A special type of gas is injected into the heat
  pump, where the internal shape of the chamber and
  the pressure of the gas accelerates the heat pump
  to high rate of rotation, over 1,000,000 rpm.

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Vortex Tubes

• Vortex tubes are commonly used for inexpensive
  cooling, where compressed gas is available.
• Industry uses vortex tubes to produce a
  temperature drop of about 45 celsius
• Vortex tubes are also used in uranium enrichment.

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Sources

• http//en.wikipedia.org/wiki/Heat_pumps