Erik Cates ME 3322

 Uses a heat source(gas or propane) to run a cooling process  Cooling is caused by heat absorption by refrigerant as it is evaporated, which removes it from the system  Refrigerant gas is then converted back to liquid form to repeat cycle  Most commonly used refrigerant is Ammonia

 Generator- receives heat from source, produces ammonia gas  Separator- separates ammonia gas from water  Condenser- hot ammonia gas is cooled, condensed to liquid form  Evaporator- evaporates ammonia liquid, creates cold effect inside refrigerator  Absorber- absorbs ammonia gas into water

 Dalton’s Law- the total pressure from gas mixture is sum of all partial pressures  Hydrogen doesn’t react with ammonia- hydrogen simply takes up space  In evaporator- hydrogen/ammonia mixture causes the partial pressure of ammonia to be lowered, which lowers the boiling point of the ammonia to below room temperature

 No moving parts  Doesn’t require electricity  Quiet  Makes use of excess heat  No HCFC’s – harmful to environment

 rigerator   bin/faq.cgi?_recurse=1&file=17  ured/21_62.jpg