We propose to heat a house in the winter with a heat pump. the house is to be maintained at 20 c at all times. when the ambient temperature outside drops to -10 c, the rate at which heat lost from the house is estimated to be 25 kw. what is the minimum electrical power required to drive the heat pump?

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

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