06-11-2012, 12:39 PM
VAPOUR ABSORPTION REFRIGERATION SYSTEM
VAPOUR ABSORPTION.pptx (Size: 305.33 KB / Downloads: 154)
INTRODUCTION
An absorption refrigerator is a refrigerator that uses a heat source to provide the energy needed to drive the cooling system. A vapor absorption system makes use of a substance, called absorbent to absorb large volumes of the vapor of a refrigerant even when cold and reduce it to a liquid, and subsequently give off its vapors when heated.
PRINCIPLE:
The absorption cooling cycle can be described in three phases:
Evaporation: A liquid refrigerant evaporates in a low partial pressure environment, thus extracting heat from its surroundings – the refrigerator.
Absorption: The gaseous refrigerant is absorbed – dissolved into another liquid - reducing its partial pressure in the evaporator and allowing more liquid to evaporate.
3. Regeneration: The refrigerant-laden liquid is heated, causing the refrigerant to evaporate out. It is then condensed through a heat exchanger to replenish the supply of liquid refrigerant in the evaporator.