Aheat pump with refrigerant-134a as the working fluid is used to keep a space at 25
o
c by absorbing heat from geothermal water that enters the evaporator at 60
o
c at a rate of 0.065 kg/s and leaves at 40
o
c. refrigerant enters the evaporator at 12
o
c with a quality of 15% and leaves at the same pressure as saturated vapor.

if the compressor consumes 1.6 kw of power, determine

(a) the mass flow rate of the refrigerant,
(b) the rate of heat supply,
(c) the cop,
(d) the minimum power input to the compressor for the same rate of heat supply

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

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.