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5 – Experimental Results 58 56 54 52 50 48 T=56.2·e(-0.048·t) [oC] 0 4 8 12 16 20 24 Time, t [h] Figure 5.55 The measured transient temperature drop at the centre of the 200 litre DHW tank insulated with 40 mm glass-wool. The data are from Figure 5.54. The experimental results can be summarized as follows: ♦ The average temperature drop for the DHW tank during the 24 hour test period was 0.26oC/h. ♦ The measured maximum temperature difference between the centre and the inner wall of the DHW tank during the entire test period was less than 0.2 K, i.e. a negligible radial temperature gradient. 5.2.1.2 Transient Temperature Gradients in a DHW Tank Filled with Hot and Cold Water Details regarding the instrumentation and the experimental procedures are found in Section 4.2.2.3, Transient Temperature Gradients in a DHW Tank Filled with Hot and Cold Water. Static Mode (Static Thermocline) In these experiments the transient temperature gradient (thermocline) between a hot and a cold water volume in the 200 litre DHW tank was measured. With reference to Section 6.2, the results were used to document the effect of internal conductive heat transfer in a DHW tank as well as to verify the transient two-dimensional heat conduction model for cylindrical single-shell DHW tanks. 161 Temperature, T [°C]PDF Image | Residential CO2 Heat Pump System for Combined
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