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5 – Experimental Results 5.2 Testing of a DHW Tank and a Movable Insulating Plate 5.2.1 Testing of a Single-Shell DHW Tank 5.2.1.1 Transient Temperature Drop In these experiments the transient temperature drop in the 200 litre DHW tank insulated with a 40 mm glass-wool mat, was measured under various operating conditions. With reference to Section 6.2, Modelling of Single- Shell DHW Tanks, the results were used to estimate the U-value for the DHW tank. The experimental set-up, the instrumentation and the experi- mental procedures are described in Section 4.2.1, Construction of the Test Rig, and Section 4.2.2.2, Transient Temperature Drop in a DHW Tank. Figure 5.54 shows the measured transient temperature profiles at the centre of the DHW tank. The initial water temperature was 56.2oC, and the average room temperature was approximately 22oC during the 24 hour test period. The vertical position of the temperature sensors refers to the distance above the bottom of the tank. 100 80 60 40 20 0 24 h 20 h 16 h 12 h 8 h 4 h Start 49 50 51 52 53 54 55 56 57 Temperature [°C] Figure 5.54 The measured temperature profile at the centre of the 200 litre DHW tank insulated with 40 mm glass-wool. The initial water temperature was 56.2oC, and the average room temperature during the test period was 22oC. Figure 5.55 shows the measured mean temperature development at the centre of the DHW tank. The data are from Figure 5.54. 160 Vertical Position [cm]PDF Image | Residential CO2 Heat Pump System for Combined
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