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5 – Experimental Results well as the experimental procedures for measuring the thermal perfor- mance and functionality of the two prototype insulating plates are presented in Section 4.2.2.4, Thermal Performance of an Insulating Plate and Section 4.2.3, Flow Studies. 5.2.2.1 Thermal Performance Figure 5.60 shows the measured transient temperature profiles above and below the 50 mm extruded polystyrene (XPS) plate, which was placed in the middle of the 200 litre tank. The initial water temperatures were 6.2oC and 54.9oC, and the average room temperature during the 12 hour test period was about 22.5oC. The vertical position in the figure refers to the distance between the temperature sensors and the plate surface (20 to 180 mm). 20 15 10 5 0 -5 -10 -15 -20 2 8 Start 12 4 1 1 Start 4 12 8 2 0 10 20 30 40 50 60 Temperature [°C] Figure 5.60 The measured temperature gradients above and below the 50 mm XPS plate. The initial water temperatures were 6.2 and 54.9oC, and the average room temperature was 22.5oC. The experimental results can be summarized as follows: ♦ The measured temperature differences between the centre and the rim of the insulating XPS plate were less than 0.3 K, i.e. a negligible radial temperature gradient. 166 Vertical Position [cm]PDF Image | Residential CO2 Heat Pump System for Combined
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