Consider an air solar collector that is 1 m wide and 6 m long and has a constant spacing of 3 cm between the glass cover and the collector plate. air flows at an average temperature of 45°c at a rate of 0.15 m3/s through the 1-m-wide edge of the collector along the 5-m-long passageway. disregarding the entrance and roughness effects and the 90° bend, determine the pressure drop in the collector. the properties of air at 1 atm and 45° are rho = 1.109 kg/m3, μ = 1.941 × 10–5 kg/m·s, and v = 1.750 × 10–5 m2/s

An ideal vapor-compression refrigeration cycle is employed to maintain a building temperature of 23°c when the outside temperature is 37°c. the cycle operates at steady state using ammonia as the working fluid. the mass flow rate of the refrigerant is 15 kg/min. the refrigerant enters the compressor at 1.5 bar and 10 °c. the condenser pressure is 20 bar and the temperature at the condenser exit is 45 °c. determine (a) the compressor power in kw. (b) the refrigeration capacity in tons. (c) the coefficient of performance. d) the maximum theoretical coefficient of performance.