An office building is found to gain 200,000 Btu/h of heat on a hot summer day over the period from 6 a.m. to 6 p.m. The same building loses 20,000 BTU/h over the first 6 hours and the last 6 hours of the same day.
What is the total Heat gain or loss of the building for the day in Btu. Then determine the average heat gain or loss for the day in Btu/h?