Aheat pump provides 65,000 btu/h of heat to a dwelling at 70 °f when the outside temperature and the evaporator temperature is 0 °f the device operates on a dry compression cycle and uses r-12 as the working fluid. assuming that the condenser outlet temperature is 10 °f above the room temperature and the evaporator temperature is 10 °f below the outside temperature. determine (a) the flowrate of the refrigerant, (b) the cop, and (c) the power required for the compressor. where mdot= 0.287 lbm/s, cop=4.9 and pc=3872w

true tan speed = ang vel x radius

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.