7. A bank of solar cells supplies power to a 95% efficient electric water heater. The area of the solar cell bank is 500 ft. The solar cell bank has a maximum theoretical efficiency of 31% and receives an incident solar flux of 150 W/m2. The heater boils water to make saturated steam at 30 psig to supply a turbine. Feedwater enters the boiler as saturated liquid at 140 deg.F. Calculate the total power in the bank. A. 7370 Btu/hr B. 7004 Btu/hr C. 7040 Btu/hr D. 7800 Btu/hr

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! Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.29 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of 430 W from the surroundings. The heat exchanger loses no heat to the environment. 26°C ↑ 42°C Condenser Expansion valve Evaporator OL Water 18°C 2 kW. 1.2 MPa 65°C W; in Compressor 60 kPa -34°C Determine the refrigeration load. (Take the required values from saturated refrigerant-134a tables and steam tables.) (You must provide an answer before moving on to the next part.) The refrigeration load is

What is the coefficient of performance of the refrigeration plant mentioned in # 3?* a. 3.1 b. 3.4 c. 3.7 d. 3.9

1. A heat exchanger is located on the roof of a warehouse to heat the air in winter. It is a coil-shaped pipe into which water vapor enters at 0.1 MPa and 300 °C and leaves with a quality of 30%. The warehouse has the following dimensions: 80m x 160m x 10m. The air must be heated from 5°C to 22°C. a. What must be the mass flow rate of the water to heat the air in less than half an hour? b. We want to cool the steam from the exchanger outlet and bring it up to 50 °C. For this, a mixing chamber with water at 20 °C is used, what will be the proportion of the steam mixture? c. The exchanger is damaged and only liquid water can be used at the same pressure (inlet T. 1 °C below saturation and outlet T. at 30°C). How long does it take to heat the air with the same flow of water?

your client needs to know about the mass flow rate ofsteam needed for a 1500 kW plant. The heat supplied to the steamin the boiler is 2700 k//kg, the heat rejected by the steam to thecooling water in the condenser is 2000 kJ/kg, and the feed pumpwork required to pump the condensate back into the boiler is 3.5 kWCalculate the mass flow of steam required

A geothermal resource/aquifer has been tested and confirmed to continuously produce saturated liquid water at 230°C. It is desired to construct a 60 MW geothermal power plant, which will utilize this resource. Two designs are proposed: a) a single flash unit and b) a dual-flash unit. A nearby cooling pond may supply sufficient cooling water to keep the condenser of the plant at 40°C. For the two types of units under consideration calculate: a) The total amount of steam that needs to be produced. b) The total amount of water the wells must provide. c) If each well produces 60 kg/s of water, what is the number of wells that must be drilled?

Please solve

5. A steam turbine receives 362,500 kg/h of steam throttled at 8.70 MPa and 410°C. Steam leaves the high pressure turbine shell at 2 MPa with 7.58°C of superheat. Reheated steam is at 1.9 MPa and 410°C. Condensate is at 78°C. For a generator output of 100MW at 94% efficiency, calculate: (A) Combined thermal effficiency (B) Actual condition of the exhaust steam (C) thermal efficiency of an ideal engine