1. A solar-thermal power plant uses an ideal Rankine cycle and refrigerant 134a
ID: 1862829 • Letter: 1
Question
1.A solar-thermal power plant uses an ideal Rankine cycle and refrigerant 134a as the working fluid. The mass flowrate of the working fluid through the power plant is 5000 kg/sec. The saturated vapor that enters the turbine is at 80 oC and the condenser pressure is 8 bar. The useful power output from the solar collector to the working fluid is = 300 W/m2.
a)Create a data/strategy table as in lecture and draw a T-S diagram.
Calculate
b)The net power output
c)The heat transfer rate from the solar collector to the working fluid.
d)The required solar collector area
e)The thermal efficiency
f)Does this power plant violate any efficiency limits?, e.g. is the calculated thermal efficiency less than the Carnot efficiency?
A solar-thermal power plant uses an ideal Rankine cycle and refrigerant 134a as the working fluid. The mass flowrate of the working fluid through the power plant is 5000 kg/sec. The saturated vapor that enters the turbine is at 80 degree C and the condenser pressure is 8 bar. The useful power output from the solar collector to the working fluid is Q''U = 300 W/m2. a) Create a data/strategy table as in lecture and draw a T-S diagram. Calculate The net power output The heat transfer rate Q.H from the solar collector to the working fluid. The required solar collector area The thermal efficiency Does this power plant violate any efficiency limits?* e.g. is the calculated thermal efficiency less than the Carnot efficiency?Explanation / Answer
b. net power output = (h2 -h3);
Net power o/p = 5000* (2644 - 2479);
P = 825 000 W = 8.25 MW;
c. Heat transferrd from the collector to the fluid =m'( h2-h1);
Q1 = 5000 * (2644 - 2049);
Q1 = 2725000W = 27.35 MW;
d. Required Solar collector area = A
so h2-h1 = Q1 * A ;
A = 5000 * (2644-2049)/300;
Thus A = 9083 m2;
e. Efficiency = Wnet/Qnet This has been neumerated above;
Q2 = 5
E = 8.25 /27.35;
E = 30.1 %;
f. Yes the thermal efficiency will always be less than the carnot efficiency'
E carnot = 1- T2/T1;
E carnot = 1-40/80;
E carnot = 50 %;
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