Vapour compression cycle

Another reason for the interest in heat-driven cycles is their ability to produce higher temperature outputs than vapour compression cycles. There are industrial... 

Fig. 5a. Vapour compression cycle Fig. 5b. Basic adsorption cycle...

Since the vapour compression cycle uses energy to move energy, the ratio of these two quantities can be used directly as a measure of the performance of the system. This ratio, the coefficient of performance, was first expressed by Sadi Carnot in 1824 for an... 

The purpose of the compressor in the vapour compression cycle is to accept the low-pressure dry gas from the evaporator and raise its pressure to that of the condenser. 

The purpose of the condenser in a vapour compression cycle is to accept the hot, high-pressure gas from the compressor and cool it to remove first the superheat and then the latent heat, so that the refrigerant will condense hack to a liquid. In addition, the liquid is usually slightly suhcooled. In nearly all cases, the cooling medium will he air or water. 

The condensed ammonia passes through a throttle and an evaporator in exactly the same way as in a standard vapour compression cycle and the useful cooling is obtained at the evaporator. 

Note that the fluid used in a vapour compression cycle should have large vaporisation enthalpy, moderate vapour pressure, as well as acceptable usage properties, as non-toxic, non-inflammable and non-corrosive. 

Dr Coney (1971) researched Taylor vortex flow with particular interest in rotary heat exchangers, which he later used in a rotary vapour compression cycle heat pump. Taylor-Couette flows are used in commercial intensified reactors now (see Chapter 5). 

Vapour compression cycle units Micro-heat exchangers... 

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