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4 – Test Rig Design and Experimental Methods from about 55 to 57oC, the initial city water temperature was approxi- mately 5oC, and the average room temperature during testing was about 21oC. The water flow rate, which ranged from about 0.6 to 2.5 l/min, was measured by means of a 2000 ml can and a stop watch. 4.2.2.4 Thermal Performance of an Insulating Plate The application of a movable insulating plate in cylindrical DHW tanks will eliminate the mixing losses and lead to a considerable reduction in the conductive heat transfer between the hot and cold water reservoirs (ref. Section 3.3.4, Application of a Movable Insulating Plate Inside the DHW Tank). The thermal performance of an insulating plate was documented by measuring the transient temperature gradient at each side of the plate. Experimental Set-Up Only the insulating plate with the largest diameter was tested, since the two plates had nearly identical designs. Owing to the additional weight of the temperature sensors and the required auxiliary equipment, it was only possible to measure the thermal performance of the plate in the static mode, i.e. when the plate was kept at a fixed position in the middle of the tank during testing. 20 thermocouples were mounted on four vertical plastic coated metal rods that were attached to the centre and the rim of the plate. In order to mini- mize heat conduction along the wires, 40 mm of each wire end was mounted horizontally (isothermally). The positioning and installation of the thermocouple wires are shown in Figures 4.31 and 4.32. Experimental Procedure The initial temperature of the insulating plate and the 200 litre polycar- bonate tank was about 22oC. When the tank was empty, the insulating plate was resting on a metal cylinder in order to protect the thermocouples at the underside of the plate. During testing, the tank was filled with 6oC city water through the diffuser until the plate was floating in the middle of the tank. The plate was then fixed to the tank wall in order to avoid any movement of the plate and subsequent mixing of hot and cold water when the hot water was supplied to the tank. The tank volume above the plate was filled with 55oC water, the polycarbonate cover was mounted, and the tank was insulated with a 40 mm glass-wool mat. The average room temperature during the 12 hour test period was about 22oC. 105PDF Image | Residential CO2 Heat Pump System for Combined
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