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Showing posts with the label thermodynamicsShow all
Consider an ideal Rankine cycle operating betwee 5 kPa and 10 MPa using Hâ‚‚0 as the working fluid. Steam enters the turbine as saturated vapor at a  flow rate of 8 kg/s.  A. Plot the ideal cycle on T-s  coordinates. B. Determine the power produced by  the turbine. C. Determine the power required to drive the pump.  D. Determine the thermal efficiency of the cycle.
A flat plate, 0.9 m in length and 0.2 m in width, is cooled by air stream at 325 K, 1 atm. The free stream air velocity is 1.22 m/s. The bottom of the plate is insulted. The plate surface temperature is uniform to be 375 K. Find the total heat loss [in W] from the plate to the air. The tolerance of your answer
Two identical 20-mm thick plates are bolted to the top and bottom flange to form the built-up beam. Each bolt has a shear strength of 27 kN.  if the beam is subjected to a shear force of V=230 kN, determine the allowable maximum spacings of the bolts to the nearest mm.
Helium is compressed from 100 kPa and 7°C to 300 kPa and 227°C. Assuming constant specific heats, determine the change in the specific entropy of helium.
To heat a house, a heat pump(HP) is used during the winter time. The COP of that heat pump is 1.4 and the HP is to produce 70,000 Btu/hr of heat to the house. How much power is needed for the heat pump to operate properly?
A chunk of brass is initially at 25°C. The brass absorbs 75 J of heat and the temperature increases to 45°C. What size is the chunk of brass (in grams)? The specific heat of brass is 0.38 Jg1C1.
Question: What is the relative humidity of air at 30° C Dry Bulb and 10 C Dew Point? A. 15% B 29% C 39% D None of the