A room that normally contains 40 people is to be air-conditioned with window air- conditioning units of 5-kW cooling capacity. A person at rest may be assumed to dissipate heat at a rate of about 360 kJ/h. There are 10 light bulbs in the room, each with a rating of 100 W. The rate of heat transfer to the room through the walls and the windows is estimated 15,000 kJ/h. a) If the room air is to be maintained at a constant temperature of 21oC, determine the number of window air-conditioning units required. b) Let us assume that a person dissipates 5 times more energy when dancing. For the same number of air-conditioning units and the same desired temperature, how many people should be invited to the room for a party featuring a few hours of dancing?