Refrigerant 134a enters the evaporator of a refrigeration system operating at steady state at -8°c and quality of 15% at a velocity of 7 m/s. at the exit, the refrigerant is a saturated vapor at a temperature of -8°c. the evaporator flow channel has constant diameter. if the mass flow rate of the entering refrigerant is 0.4 kg/s, determine: (a) the diameter of the evaporator flow channel, in cm. (b) the velocity at the exit, in m/s.

Ahouse has the following electrical appliance usage (1) single 40w lamp used for 4 hours per day (2) single 60w fan used for 12 hours per day (3) single 200w refrigerator that runs 24 hours per day with compressor run 12 hours and off 12 hours find the solar power inverter size in watt with correction factor of 1.25.

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

Which of the following refers to refers to how well the control system responds to sudden changes in the system. a)-transient regulation b)- distributed regulation c)-constant regulation d)-steady-state regulation