Question

The equation for the useful energy prođuced by a solar thermal collector can be written as: ) Qu Ac FR(a)IT-FRUL (T; - Ta) From this derive an cquation for the efficiency of a solar thermal collector. The results of a standard collector test for such a collector are shown below. Efficiency of a Flat Plate Collector 1 0,8 0.6 0.4 0.2 0 0.03 0.02 0.04 0.05 0.01 (T-T What important information do the slope and intercept of this curve provide? If the solar radiation level at a particular time is 750 W/m2 and the ambient temperature is 28°C, what is the stagnation temperature of this collector in these conditions? What type of collector do you think this might be, and why? 0 Marks Draw a block diagram of a water-based active solar hot water system providing hot water to a d) process heating application. Label the different parts of the system. Describe the operation of the system over the course of a fine, sunny day. 15 Marks Efficiency

Answer 1

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