A design modification to the house in Problem 9.5 is desired. A 200 ft2, vented, 12 in. thick Trombe wall is to be added to the direct gain system. Assuming the same types of glazing and storage as described earlier, determine
(a) the annual heating auxiliary energy needed and
(b) the Trombe wall mass.
Problem 9.5
A 2000 ft2 house in Boston is being designed with NLC-12,000 Btu/F-day and 150 ft2 of direct gain. The direct gain system includes double glazing, nighttime insulation, and 30 Btu/ft2 F thermal storage capacity. Using the LCR method, determine
(a) the annual auxiliary heating energy needed by this design and
(b) the storage mass and dimensions required.