Problem 2 A 10 m^2 system for solar water heating consists of absorber tubes and

Question

Problem 2 A 10 m^2 system for solar water heating consists of absorber tubes and a mixing tank. Water at T1= 20 degree C enters the absorber tubes at a constant flow rate of m1 = 50 gs^-1. The absorber tubes transfer 60% of incident solar irradiation to the water. The incident concentrated solar irradiation is qsum = 1000W m^- 2. Model the sun as a blackbody at 5777K. Water exiting the absorber tubes then enters the mixing tank where it is mixed with water entering the tank at T3 = 30 degree C and m3 = 5 kgs^-1. Assume the average boundary temperature of the tubes is 27 degree C and the reference conditions are T0 = 25 degree C and P0 = 101.3 kPa. Approximate liquid properties with saturated liquid properties. Question: (a) Calculate the temperature of the water exiting the absorber tubes (b) Calculate the rate of exergy transfer accompanying the heat transferred from the absorber tubes to the water (c) Calculate the amount of exergy destroyed in the absorber tubes (d) For the mixing tank, calculate the temperature of the exiting water and the rate of exergy destruction.

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