A14 kw cooling load is to be served by operating an ideal vapor-compression refrigeration cycle with its evaporator at 320 kpa and its condenser at 800 kpa.

calculate the refrigerant mass flow rate and the compressor power requirement when refrigerant-134a is used.

(take the required values from the saturated refrigerant-134a tables.)the refrigerant mass flow rate is kg/s. the compressor power requirement is 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.

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Brief discuss how the presence of dislocations in crystal structures can be an advantage and a disadvantage to engineer and designers.