Air enters the compressor of an ideal brayton refrigera- tion cycle at 100 kpa, 270 k. the compressor pressure ratio is 3, and the temperature at the turbine inlet is 310 k. determine (a) the net work input, per unit mass of air flow, in kj/kg. (b) the refrigeration capacity, per unit mass of air flow, in kj/kg. (c) the coefficient of performance. (d) the coefficient of performance of a carnot refrigeration cycle operating between thermal reservoirs at tc=270k and th=310 k, respectively.

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

Prove the equivalence between the two statements of the 2nd law of thermodynamics (i.e., a violation of one statement leads to the violatio the other statement)

Consider a 1.2 meter high and 2 meter wide glass window whose thickness is 6 mm and thermal conductivity is 0.78 w/m °c. the room temperature is maintained at 24 °c, while the outdoor temperature is -5 °c. the convective heat transfer coefficients on the inner and outer surfaces of the window are 10 w/m2 °c and 25 w/m2 °c respectively. (a) draw the thermal resistance network, etermine the steady rate of heat transfer t e glass window (c) determine the temperature of the inner surface of the window