5-2 A conditioned space receives warm, humidified air during winter air conditioning in order to maintain 20°C and 30 percent relative humidity. The space experiences an infiltration rate of 0.3 kg/s of outdoor air and an additional sensible-heat loss of 25 KW. The outdoor air is saturated at a temperature of -20°C (see Table A-2). If con- ditioned air is supplied at 40°C dry-bulb temperature, what must the wet-bulb temper ature of supply air be in order to maintain the space conditions? Ans. 18.8°C