Question

For the collector geometry shown below and an inlet temperature of SO F, calculate the following parameters for this liquid flat plate design: 1) Useful energy collection, 2) Outlet temperature, 3) Collector efficiency, and 4) Pressure drop A 50% ethylene glycol solution flows upward through the collector at 0.25 GPM entering at the given temperature. The collector is mounted in a vertical position. Calculate the performance in Amherst, Mass. for the hour between 11 and noon on November 19- when the solar radiation, 260 BTU/mft2 (total) was measured at a 60 degree angle. (Just to save time, and to be consistent, you can assume that the TOTAL INSOLATION on a vertical plane was equal to 240 BTU/ hrft.) Also, at this time you may also assume a 10 mph wind and an ambient temperature of 50 °F The collector plate is 84 x 29.5 inches in size, and has the following cross section: 29.5 in. 5 in. The six tubes are 3/8 in (ID) copper with a 0.025 in wall and are soldered to a 0.0135 in thick copper plate. The absorber plate is coated with a flat black surface (a e0.98). The back is insulated insulation of your choice (justify) and the collector plate is surrounded by an anodized aluminum frame of 32 x 90 in size (you can specify this insulation alsol). The collector has one outer cover plate of 1/8 in thick ASG white crystal glass that is placed about 3/4 in above the absorber.

Answer 1

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