PDF Publication Title:
Text from PDF Page: 242
7 – Discussion and Analysis ♦ Owing to the higher discharge pressure, the exergy loss for the com- pressor was even larger than in the combined mode (approx. 58%). ♦ The total exergy loss for the DHW gas cooler units was about 15 to 55% higher than that of the combined mode. This was due to the larger mean temperature difference and the higher mean temperature level during heat rejection. ♦ The moderate exergy loss for the expansion valve (14%) was a result of the relatively low outlet temperature from the DHW preheating gas cooler unit (8.3oC at 60°C DHW, 12.0oC at 80oC DHW). 7.2.3 The SH Mode Figure 7.6 shows the exergy losses for the prototype CO2 heat pump system during operation in the SH mode at optimum high-side pressure and supply/return temperatures of 33/28oC and 40/35oC. The numbers at the top of the bars represent the measured COP of the heat pump unit. 1600 2.78 3.15 292 344 221 619 Space Heating System Expansion Valve GC Space Heating Compressor Evaporator 171 249 229 552 1200 800 400 0 82 75 33/28°C 40/35°C Figure 7.6 The exergy losses for the prototype CO2 heat pump system at optimum high-side pressure during operation in the SH mode at 33/28 and 40/35oC supply/return temperatures. ♦ The absolute exergy loss for the compressor was almost the same as in the combined mode due to identical discharge pressures at the same supply/return temperatures in the SH system, i.e. 8.0 MPa at 33/28-60oC and 33/28oC, and 9.5 MPa at 40/35-80oC and 40/35°C. 220 Exergy Loss [W]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)