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2 It is important to consider the likely operating pressures in both the suction and discharge sides of the system. Ideally, a refrigerant is chosen that will have an evaporating pressure above atmospheric pressure under normal operating conditions, so as to avoid air and moisture being drawn into the system in the event of a leak. Thus, a refrigerant should be chosen with a normal boiling point (NBP) that is lower than the anticipated evaporating temperature. A selected refrigerant should also have a condensing pressure that does not exceed the pressure that the system components are designed for, as this can have safety implications. The capacity and COP are mainly dictated by the design and control of the system itself (compressor, heat exchangers, piping, etc), although the properties of the refrigerant play a part in this. The COP can be affected by the compression ratio (which is dictated by the saturation pressure-temperature characteristic), heat exchanger performance and pressure losses around the system, which are all influenced by latent heat, density, viscosity, thermal conductivity, specific heat. For a given evaporating and condensing temperature, the cooling (or heating) capacity of a system is strongly influenced by the latent heat and density of the gas entering the compressor. For conventional systems, a fairly high critical temperature is preferred (at least 20K above the condensing temperature), unless the system is specially designed for operation near or above the critical temperature, such as with R744 systems. 36 RefrigerantsPDF Image | Manual for Refrigeration Servicing Technicians
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