Categorise the loads in cooling load calculations. 4.2 For an office 6 mx 3 mx 4 m high, the ambient conditions are: dry bulb temperature (Tdb) = 40C, wet bulb temperature (Two) = 26C while the indoor conditions are: T = 22C and relative humidity = 60%. Further, it may be assumed that the office has a structural load of 6000 kJ/hr, 5 tube lights (ballast factor = 1.20 each of 40 W rating. 13.5 air changes per 24 hours for the infiltration load, 7.1 x 10 m/s per person of ventilation, 10-person occupancy and each release 500 kJ/hr. Estimate the capacity (in kW) of a window air-conditioner required to achieve the desired objective. (15) [19] QUESTION 5 A standard vapour compression cycle develops 85 kW of refrigeration using refrigerant 22 operating with a condensing temperature of 35C and an evaporating temperature of -10C. 5.1 Sketch the p-h diagram and name the processes 5.2 Determine: (a) (b) the circulation (mass flow) rate of the refrigerant in kg/s (c) the power required by the compressor in kW (d) the coefficient of performance (4) the refrigerating effect in kJ/kg (e) the volume flow rate measured at the compressor suction (f) the power per kilowatt of refrigeration (2) (4) (2) (3) (2) (2) (2) (2) (g) the compressor discharge temperature (h) If a single cylinder compressor which runs at 500 rev/min with volumetric efficiency of 92% with of length of stroke/bore diameter (L/D = 1.5), calculate the cylinder dimensions. (5)