Steam enters a counterflow heat exchanger operating at steady state at 0.07 mpa with a quality of 0.9 and exits at the same pressure as saturated liquid. the steam mass flow rate is 1.3 kg/min. a separate stream of air with a mass flow rate of 100 kg/min enters at 30°c and exits at 60 c. the ideal gas model with cp = 1.005 kj/kg-k can be assumed for air. kinetic and potential energy effects are negligible. determine the temperature of the entering steam, in °c. for the overall heat exchanger as the control volume, what is the rate of heat transfer, in kw

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody

Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way