Water flows in a heat exchanger, and heat is transferred from the water to heat air. At the inlet, the pressure of the water is 100 psia, and at the outlet, it is 80 psia. The initial specific volume is 0.017736 ft3/lbm, and the final specific volume is 0.01757 ft3/lbm. The initial enthalpy is 298.61 Btu/lbm, the initial internal energy is 298.28 Btu/lbm , the final enthalpy is 282.21 Btu/lbm, and the final internal energy is 281.95 Btu/lbm. Determine the heat transferred from the water.

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

Most leaks in reciprocating air compressors can be detected and minimized by: (clo4) a)-detecting leakage areas using ultrasonic acoustic detector. b)-tightening joints and connections c)-replacing faulty equipment d)-all of the given options