An electronic instrument is cooled by air blown through the case. air is supplied at 20? c and is exhausted at 70? c. pressure remains essentially atmospheric (101.3 kpa) find: a. the change in internal energy (per kg) of air as it flows through b. the change in specific volume (%) c. the amount of heat the air picks up, per kgair

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