PDF Publication Title:
Text from PDF Page: 237
7 – Discussion and Analysis 45 40 35 30 7.0 7.5 8.0 8.5 9.0 9.5 10.0 Supercritical Pressure [MPa] Figure7.3 The correlation between the pressure and the pseudo- critical temperature of supercritical CO2 (RnLib, 2003). 7.1.3.2 Constant or Variable High-Side Pressure? From an economical point of view, it would be a great advantage if the integrated CO2 heat pump unit could be operated at a constant high-side pressure and still achieve more or less the same COP as a system using high-side pressure control. The experimental results regarding the benefit of high-side pressure control can be summarized as follows: ♦ As long as the entire DHW heating demand was covered by ope- ration in the combined mode, and the temperature levels in the SH and DHW systems remained constant, it was possible to operate the CO2 heat pump at the same high-side pressure in the combined mode and the SH mode and still achieve the maximum COP. ♦ At 60oC DHW temperature, the COP was about 5% (combined mode), 0% (DHW mode), and 7.5% (SH mode) less than the maxi- mum COP, when CO2 heat pump unit was run at a constant high-side pressure of 9 MPa. ♦ At 70oC DHW temperature and 35/30 to 40/35oC supply/return temperature in the SH system, the COP was approximately 3% (com- bined mode), 7% (DHW mode), and 6% (SH mode) less than the maximum COP, when the CO2 heat pump unit was run at a constant high-side pressure of 9.5 MPa. 215 Pseudo-Critical Temperature [°C]PDF Image | Residential CO2 Heat Pump System for Combined
PDF Search Title:
Residential CO2 Heat Pump System for CombinedOriginal File Name Searched:
20559406.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)