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3 – Theoretical Background and System Analysis 0.030 0.025 0.020 0.015 0.010 -10oC -5oC 0oC +5oC Variable evaporation temperature 5 10 15 20 25 30 35 40 CO2 Outlet Temperature [°C] Figure 3.8 The volumetric heating capacity as a function of the CO2 outlet temperature from the gas cooler and the evaporation temperature. The high-side pressure is 9 MPa, and the other boundary conditions are as in Figure 3.4. 3.2.3 Gas Cooler Configurations The main operating modes of an integrated CO2 heat pump system are: ♦ Simultaneous space heating and hot water heating (combined mode) ♦ Hot water heating only (DHW mode) ♦ Space heating only (SH mode) The CO2 outlet temperature after rejection of useful heat in the gas cooler should be as low as possible in order to achieve a high COP for the system. The CO2 outlet temperature is mainly determined by: ♦ The characteristics of the fluids to be heated (heat sinks): o the inlet temperatures (or temperature set-points) o the CP-values (ref. Appendix A2.4) ♦ The design and configuration of the gas coolers ♦ The compressor discharge temperature: o the suction pressure and temperature o the high-side pressure o the isentropic efficiency and heat loss for the compressor 34 Volumetric Heating Cap. [kJ/cm3]PDF 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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