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6 – Modelling 6.1.3.6 Verification of the Simulation Model The simulation model for the tripartite gas cooler was tested and verified by means of experimental data from the CO2 heat pump unit (ref. Section 5.1). Table 6.2 shows the percentage deviation between the simulation results and the measurements with regard to the main temperatures (Temp.), the total heating capacity (Qtot) and the COP. The left-hand column shows the set-points for the space heating (SH) and hot water (DHW) systems. The middle column displays the required adjustment of the CO2 mass flow rate (∆mCO2) and the tube length of the DHW reheating gas cooler (∆LDHW-R) in order to keep the deviation of Qtot and COP within ±1% from the measured values. Table 6.2 The deviation between the simulation results for the tripartite gas cooler model and the experimental results from the CO2 heat pump unit (ref. Section 5.1). Temp. Set-points SH DHW [oC] [oC] 33/28 60 33/28 80 35/30 60 35/30 80 40/35 60 40/35 80 * 70 35/30 * Corrections ∆mCO2 ∆LDHW-R [%] [%] +4.6 +14 +8.6 0 +3.5 0 +5.9 +14 +5.9 +14 +4.5 +10 +8.6 +20 +2.6 * Deviation Temp. Qtot COP [oC] [%] [%] ±0.2 +0.2 +0.3 ±0.3 -1.0 -1.0 ±0.3 -0.6 -0.6 ±0.3 +0.6 +0.7 ±0.3 +0.5 +0.5 ±0.2 +0.1 0 ±0.3 +0.6 +0.6 ±0.1 -1.0 -1.0 Due to the relatively large oil concentration in the CO2 flow for the prototype heat pump unit, the CO2 mass flow rate in the simulations were increased as much as the ratio between the measured heating capacity in the water circuits and CO2 circuit (ref. Figure 5.53, Section 5.1.3.9, Comparison of the Measurements from the Water Circuits and the CO2 Circuit). For most of the simulations the tube length of the DHW reheating gas cooler unit had to be increased by about 10 to 20% in order to comply with the measured heating capacity and outlet temperatures. Nevertheless, Table 6.2 demonstrates that the simulation model predicted the performance of the tripartite counter-flow tube-in-tube CO2 gas cooler with satisfactorily accuracy. 182PDF 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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