Question

Could someone help me with this question please as I am kinda lost as in how to do these type of questions

a) Draw a diagram of a solar hot water system and discuss the functions of its [5 marks For the solar collector, analyse the solar radiation heat gain and heat losses through different modes of heat transfer. How is the heat transfer rate to the water per unit area of the collector calculated? b) [5 marks c) For the solar collector, show that the thermal efficiency n can be calculated by where is the transmittance, α is the absorptance, u is the overall heat loss coefficient, Tc is the temperature of the absorber plate, Ta is the temperature of the surrounding, G is the solar radiation flux. [5 marks] What is the threshold radiation of the collector? d) [5 marks] e) For a solar collector, the optical efficiency a is 0.8, the overall heat loss coefficient is 5.2 W/m2 K, the ambient and collector temperatures are 5 °C and 50 °C, respectively, the solar radiation flux is 687.8 W/m2. What are the heat transfer rate to water per unit area of the collector, the thermal efficiency of the collector and the threshold radiation? [5 marks]

please explain each step

Answer 1

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