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Rapport 2414173 - October 2007 __________________________________________________________________ • The high pressure is no longer fixed by the cooling fluid temperature or flow rate; therefore, there is a need to control this parameter; • The high pressure refrigerant is not "condensed" – it is cooled as a supercritical fluid; • In most cases, the refrigerant flow rate is not fixed based on the value of superheat at compressor suction. • The more refrigerant charge there is in the high pressure side, the higher the pressure will be. Gas cooling above the critical point Figure 6 : A transcritical cycle using R744 2.3.Optimum pressure with the transcritical cycle It was seen that for the subcritical cycle, the condenser pressure was fixed by the condensing temperature, which in turn is a function of the condenser size and the cooling fluid flow rate and temperature. For the transcritical cycle, the gas cooler pressure is not a function of the R744 temperature, because there is no unique relationship between temperature and pressure above the critical point. This means that the system can operate at different values of high pressure, which can be set by the control scheme. __________________________________________________________________________________________ SHERPHA PROJECT - Transcritical R744 Heat Pumps – Technician's Manual 15/63PDF Image | Transcritical R744 (CO2) Heat Pumps 2017
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