If in a standard vapor-compression cycle using refrigerant 22 the evaporating temperature is - 5°c and the condensing temperature is 30°c, sketch the cycle on pressure-enthalpy coordinates and determine a. the work of compression, b. the refrigerating effect c. the heat rejected in the condenser, all in kilojoules per kilograms d. the coefficient of performance.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?