Compare the annual SSF for 150 ft2 of the following passive systems for the house in Problem 9.5:
(a) direct gain (DGA3),
(b) vented. Trombe wall (TWD4),
(c) unvented Trombe wall (TW14),
(d) waterwall (WWB4), and
(e) sunspace (SSB4).
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.