Use of heat pump as vapor absorption machine

Replies

• 

  Ramani Aswath

  All that a heat pump does is to remove heat from a lower temperature source and delivers to a higher temperature sink. This can be a vapour absorption system or an evaporator system.
  If you can explain your application in more detail perhaps more people will help with their ideas.
• 

  Harshad Katre

  I have Vapor absorption system designed for cooling water upto 10 deg C. But I want cooling water at 8 deg C for my process cooling. Can I use heat pump evaporator section to cool the fluid below 10 deg C?
  Pls reply.
• 

  Ramani Aswath

  Depends. The vapour pressure in the evaporator has to be well below the saturation vapour pressure of the fluid at 8 C. Otherwise the temperature will not reach 8 C.
• 

  Harshad Katre

  Thank You Sir.
  But Can I use heat pump as vapor absorption refrigeration system with some modifications?
• 

  Ramani Aswath

  I am a bit confused. A heat pump just pumps heat from a lower temperature to a higher temperature just as a water pump pumps water from a lower level to a higher level. Any cooling system is therefore a heat pump. Even the domestic refrigerator and AC are heat pumps.
  Since we are only moving the heat a heat pump can move about three times its power. This is in contrast with a heater, which will generate an exact equivalent of heat. That is 1 kWHr = 860 kcal. A heat pump will move about 2500 kcal for the same consumed power.
  Coming back to what you asked, the vapour absorption equipment is quite different from a compression/vapourization system. If your heat pump is a vapour absorption system you can modify it to your purpose.
  If you can post more details, may be some one here can give a better answer. Otherwise you will get only general answers.