Manual for Refrigeration Servicing Technicians

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Manual for Refrigeration Servicing Technicians ( manual-refrigeration-servicing-technicians )

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2 CHAPI PAGE TRE T2he next illustration shows action of a zeotropic mixture of 6 refrigerant components, fluid A and fluid B, as it flows through a heat exchanger tube. In the case of a pure fluid, the temperature of the refrigerant remains the same as the liquid vaporises, or the vapour condenses. However, with a zeotropic blend, as the refrigerant vaporises, the saturation temperature rises, or as the vapour condenses, the saturation temperature falls. The refrigerant is at the bubble temperature when it is just a pure liquid (e.g. when it is just evaporating) and is at the dew temperature when it is just a pure gas (e.g. when it is just condensing). The range of temperature between the dew point and bubble point is called the temperature glide. This is illustrated here: ZEOTROPIC BLEND PRESSURE - TEMPERATURE CHART LENGTH OF HEAT EXCHANGER LIQUID VAPOUR PURE FLUID A BLEND OF FLUID A AND FLUID B PURE FLUID B DONE Behaviour of a zeotropic blend with changing temperature EVAPORATION BUBBLE POINT (LIQUID WITH A «BUBBLE» IN IT) DEW POINT (VAPOR WITH A «DEW DROP» IN IT) GLIDE SUBCOOLED BOILING CONDENSATION Condensation and evaporation of a zeotropic blend Prior to the Montreal Protocol, zeotropic mixtures were rarely used, perhaps the only example being R400 (a mixture of R12 and R114). In the search for alternatives for CFCs, and latterly, for alternatives for HCFCs, a large number of zeotropic mixtures have been formulated. Some of the HFC and HC based zeotropic blends to replace CFCs and HCFCs are: R404A, R407C, R410A and R436B. PROPORTION VAPORISED/CONDENSED 48 1 TEMPERATURE Refrigerants TEMPERATURE

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