Compare the annual SSF for \(150 \mathrm{ft}^{2}\) 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), 

(e) sunspace (SSB4).

Problem 9.5

A \(2000 \mathrm{ft}^{2}\) house in Boston is being designed with NLC-12,000 Btu/F-day and \(150 \mathrm{ft}^{2}\) of direct gain. The direct gain system includes double glazing, nighttime insulation, and \(30 \mathrm{Btu} / \mathrm{ft}^{2} \mathrm{~F}\) thermal storage capacity.