16C Q.1(a) The temperature and the relative humidity of the air in a room and 50% respectively. The barometric pressure is 101.3 kN/m. Using equations to calculate: the humidity ratio (moist content); (i) (ii) the dew point temperature. (5 marks) *Do NOT use the psychrometric chart for this question. Water properties table is given in Appendix 1. (b) It is required to heat 5 m of the moist air mentioned in part (a) to 30C. Calculate: (i) (ii) the mass of dry air; the heat required for heating up the air. Given: T V = = R Ra = 287 J/(kg K), Ra Pa Heat gain or cooling load Cpd = 1.005 kJ/kg . K, Cps = 1.88 kJ/kg. K Instantaneous heat gain (c) With reference to Figure Q.1, explain what thermal storage effect is and how this effect can help reduce the cooling or heating load. (5 marks) -Light (5 marks) Medium Heavy Actual cooling load Time Figure Q.1 thermal storage effect Page 2 of 11 (5 marks) (5 marks)