Asteam power plant operates on the ideal reheat rankine cycle. steam enters the high pressure turbine at 6 mpa and 500°c and leaves as saturated vapour. steam is then reheated to 400°c before it expands to a pressure of 10 kpa. heat is transferred to steam in the boiler at a rate of 6 x 104 kw. steam is cooled in the condenser by cooling water from a nearby river, which enters the condenser at 7°c. show the process cycle on t-s diagram with respect to saturation lines. determine a) the pressure at which the reheating takes place b) the net power output and thermal efficiency c) the minimum mass flow rate of the cooling water required

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.