A factory building has an average ventilation rate of 1.3 air changes per hour in the office area and 1.5 air changes in the production area and 2. 0air changes in the reception area. Calculate the ventilation heat loss. The volume of the production area is V=8000 m 3 , office is 3000 m 3 and the reception area is 1000 m 3 . The internal temperatures are 24deg C for the production area, 22 C for the office and 21 deg C for reception. The external temperature is 5deg C