One lb of oxygen in a piston cylinder assembly undergoes a cycle consisting of the following processes:Process 1-2: Constant-pressure expansion from T1=450R, p1=30 lbf/in^2 to T2=1120R. Process 2-3: Compression to T3=800R and p3 = 53.3 lbf/in^2 with Q(2-3) = -60 Btu. Process 3-1: Constatnt-volume cooling to state 1.Employing the ideal gas model with cp evaluated at T1, determing the change in specific entropy in Btu/lb * R, for each process.

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

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.