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CO2 CO2 CO2 TCO2 pCO2 DHW Preheating (A) Space Heating (B) CO2 DHW Reheating (C) 6 – Modelling 12 3 4 ... ... 19 20 12 3 4 ... ... 19 20 12 3 4 ... ... 19 20 ... mDHW mSH Water mCO2 TDHW-in TSH-in TSH-out TDHW-out Figure 6.5 Water Principle showing the structure of the modelled tripartite counter-flow tube-in-tube CO2 gas cooler. Since the tripartite gas cooler was of a counter-flow type, initial linear temperature profiles based on the known inlet CO2 and water temperatures were established by running an integral Visual Basic subroutine. The itera- tion process was then started in sub-section no. 20 for the DHW reheating gas cooler. The sequential calculation of the inlet and outlet variables for each sub-section was repeated until the difference between the heat flow at the CO2-side and water-side of sub-section no. 10 for each gas cooler unit was less than 1 W. This convergence criterion constituted less than 2% of the heat flow for the sub-sections in the different gas cooler units. The results from the simulations were presented as shown in Figure 6.6 and by means of various types of diagrams. Modelling of a Tripartite Counter-Flow Tube-in-Tube CO2 Gas Cooler 83.55 bar 9.4°C 23% 1.600 kW 7.0°C 35% 2.401 kW 60.0°C 85.00 bar 1.491 kg/m 86.4°C DHW Preheating GAS COOLER 30.6°C 0.142 l/s 30.1°C 35.0°C Space Heating GAS COOLER 28.2°C 1.090 l/min 28.2°C Q-tot P-in COP 6.904 kW 1.775 kW 3.89 43.0°C DHW Reheating GAS COOLER 2.903 kW 42% Figure 6.6 Presentation of the main results from the tripartite gas cooler simulation programme (Microsoft Excel/VBA). 181PDF Image | Residential CO2 Heat Pump System for Combined
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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
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