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Based on the test results, the heat pump COP is compared with the data given by the manufacturer. The values for the COP from the manufacturer data sheet are given for three different outdoor temperatures: -15, 7 and 20 °C, based on constant water inlet and outlet temperatures to and from the heat pump at 30 °C and 50 °C respectively. Several tests have been done at different outdoor temperatures during stages 1 and 2. Due to some limitations of the climate chamber, it was however not possible to reach as low as -15 °C outdoor temperature. The manual specifies three different outdoor conditions. Therefore, only the test results at 7°C and 20°C outdoor temperatures are compared with data from the manufacturer during phase one of the testing. The test results at 7 °C outdoor temperature were obtained at a mean water inlet temperature of 30.12 °C and a mean outgoing water temperature of 59.17 °C. Compared with the test conditions of the manufacturer, the laboratory testing had a higher water outlet temperature (59 compared to 50°C), which results in a lower COP. The COP from the lab test was 2.91 whereas the manufacturer data gives 3.1. For 20°C outdoor temperature, the lab testing results were achieved at a mean water inlet temperature of 30.4 °C and a mean water outlet temperature of 51.58 °C, which is very similar to the manual’s given testing condition. The lab testing under the above specified condition achieved a COP as 4.2, which is slightly higher than the manual data as 3.75. Figure 12. Example of test results at +7 °C outdoor temperature 22PDF Image | CO2 heat pumps for the Swedish market
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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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