Solved: A Solar Trough Power Plant Is A Rankine Cycle That…

Show transcribed image text A solar trough power plant is a Rankine cycle that uses solar energy as its heat input Solar energy is focused by parabolic trough receivers onto a pipe that carries a heat transfer fluid. The heat transfer fluid is heated as it flows through the solar-field and then returns to the power plant. The fluid transfers heat to the working fluid of the power plant in order to provide the thermal energy that drives the power cycle, which is shown in the followina figure The heat transfer fluid leaves the field and enters the power plant at Thtf.in 180 °C Some of the fluid enters the heater where it heats the working fluid for the cycle Because the working temperature for the cycle is so low, refrigerant R134a is the choice for the working fluid in the power cycle. The R134a leaves the heater at T-100。C. The R134a enters the high pressure turbine at Pi – Phigh 2500 kPa and is expanded to P2Preheat1000 kPa. The efficiency of the high pressure turbine is, nHPt0.85. The remainder of the heat transfer fluid enters the reheater where it re-heats the R134a leaving high pressure turbine to T3 – 100 °C. The R14a leaving the reheater passes through the low pressure turbine which has an efficiency of npt0.82. The condensing pressure is set so that the R134a leaving the condenser is saturated liquid at T6- 5 °C The efficiency of the pump is np – 0.70. The R143a leaving the low pressure turbine is used to pre-heat the R134a before it reaches the heater using a recuperative heat exchanger. The temperature of the R134a leaving the recuperative heat exchanger and entering the condenser has temperature T5 20 °C