Heat Transfer, Refrigeration and Air Conditioning - Section 1 (4)

Which of the following represents a heat pump?

The total radiation from a black body per second per unit area is __________ fourth power of the absolute temperature. This statement is known as Stefan-Boltzmann law.

The condition of refrigerant after leaving the compressor and before entering the condenser is superheated vapour.

Thermal diffusivity is a

The sensible heat factor during cooling and dehumidification process is given by (where h₁ = Enthalpy of air entering the cooling coil, h₂ = Enthalpy of air leaving the cooling coil, and h_A = Enthalpy of air at the end of dehumidification process)

The wet bulb temperature lines, on the psychrometric chart, are curved lines.

The optimum effective temperature for human comfort is

Reynolds number (R_N) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, c_p = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)