Question: 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,

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. Using the LCR method, determine

(a) the annual auxiliary heating energy needed by this design

(b) the storage mass and dimensions required.

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