PDF Publication Title:
Text from PDF Page: 065
3 – Theoretical Background and System Analysis Due to the bad temperature fit between the supercritical CO2 and the water in the floor heating system and the consequent high average temperature difference, the COP will be lower than that of a conventional heat pump cycle where heat is given off at constant temperature by condensation of the working fluid (Kerherve and Clodic, 2002). 110 90 70 50 30 10 -10 450 Figure 3.14 3.2.4.3 500 550 600 650 700 750 110 90 70 50 30 10 -10 800 850 B CO2 - 8.5 MPa (b-c) Low-temperature space heating b c B Specific Enthalpy, h (kJ/kg) Illustration of the heat rejection process for a tripartite gas cooler operating in the SH mode. The high-side pressure is 8.5 MPa. Design of the Tripartite Gas Cooler Designing a tripartite gas cooler for an integrated CO2 heat pump unit is an iterative optimization process, since there are tight reciprocal connec- tions between the set-point temperatures for the secondary systems and the heat transfer surfaces for the three gas cooler units on one hand, and the required heating capacity, the DHW heating capacity ratio, the high- side pressure and finally the COP on the other hand. One of the main goals in the design process, is to obtain the largest possible temperature glide during heat rejection (i.e. a large enthalpy difference) at the lowest possible high-side pressure (i.e. a moderate compressor power input) during operation in the different modes. Figure 3.15 shows the principle of the heat rejection process in the tripartite gas cooler as well as an overview of the main variables and input parameters. 43 Temperature, T (oC)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 | RSS | AMP |