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Rapport 2414173 - October 2007 __________________________________________________________________ 2.2.Comparison of subcritical and transcritical cycles 2.2.1. Characteristics of subcritical cycles One of the most important criteria for a refrigerant is its critical point – i.e. the point at which vapor can no longer be distinguished from liquid. This point is indicated by values of temperature and pressure which are the critical parameters and which are characteristics of the refrigerant. Figure 5 : A subcritical cycle using R22 Traditional refrigerants have been chosen or designed so that they can be condensed with an available cooling medium, often water or air. This requires that their critical temperature be well above the temperature of the cooling medium, i.e. typically in the range 80-110°C. Refrigerant R22, for example, will yield a thermodynamic cycle that could be illustrated by Figure 5. The R22 critical temperature is 96.2°C. This means that with water or air available at 40°C, R22 may condense at, say 55°C. Because there exists a unique relationship between pressure __________________________________________________________________________________________ SHERPHA PROJECT - Transcritical R744 Heat Pumps – Technician's Manual 13/63PDF Image | Transcritical R744 (CO2) Heat Pumps 2017
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