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Shubham Hadadare Follow. Refrigeration and air conditioning. Refrigeration system 1. Prem Kumar. They know how to do an amazing essay, research papers or dissertations. Burla Ramakrishna. Jawed Ahmed. Kannan Nsk. Yogesh Chavan. Pavan Kalyan Mamidi. Amrit Mahato , Student at purulia polytechnic. Taz Rockzz Rahman. Show More. Views Total views. Actions Shares.
No notes for slide. Refrigeration and Air conditioning 1. ADE S. Another device that transfers heat from a low-temperature medium to a hightemperature one is the heat pump. Refrigerators and heat pumps are essentially the same devices; they differ in their objectives only. The objective of a refrigerator is to remove heat QL from the cold medium; the objective of a heat pump is to supply heat QH to a warm medium.
The refrigerant is a heat carrying medium which during their cycle in a refrigeration system absorbs heat from a low temp. This rejection of heat from low level to higher level of temp. Vapour compression cycle In such a system, the refrigerant is usually dissolved in a liquid.
A concentrated solution of ammonia is boiled in a vapour generator producing ammonia vapour at high pressure. The high pressure ammonia vapour is fed to a condenser where it is condensed to liquid ammonia by rejecting energy as heat to the surroundings. Then, the liquid ammonia is throttled through a valve to a low pressure.
During throttling, ammonia is partially vapourized and its temperature decreases. Then this low-pressure ammonia Vapour is absorbed in the weak solution of ammonia. The resulting strong ammonia solution is pumped back to the Vapour generator and the cycle is completed. The COP of the absorption system can be evaluated by considering it as a combination of a heat pump and a heat engine System Programming PPT slides.
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