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E NERGY C ONSERVATION C ODE§5E-2-1 <br />b.The combined air exchange rate for infiltration and mechanical ventilation shall <br />be determined in accordance with Equation 43 of 2001 ASHRAE Handbook of <br />Fundamentals, page 26.24 and the “Whole-house Ventilation” provisions of 2001 <br />ASHRAE Handbook of Fundamentals, page 26.19 for intermittent mechanical <br />ventilation. <br />c. Thermal storage element shall mean a component not part of the floors, walls or <br />ceilings that is part of a passive solar system, and that provides thermal storage <br />such as enclosed water columns, rock beds, or phase-change containers. A thermal <br />storage element must be in the same room as fenestration that faces within 15 <br />degrees (0.26 rad) of true south, or must be connected to such a room with pipes or <br />ducts that allow the element to be actively charged. <br />d. For a proposed design with multiple heating, cooling or water heating systems <br />using different fuel types, the applicable standard reference design system <br />capacities and fuel types shall be weighted in accordance with their respective <br />loads as calculated by accepted engineering practice for each equipment and fuel <br />type present. <br />e. For a proposed design without a proposed heating system, a heating system with <br />the prevailing federal minimum efficiency shall be assumed for both the standard <br />reference design and proposed design. <br />f. For a proposed design home without a proposed cooling system, an electric air <br />conditioner with the prevailing federal minimum efficiency shall be assumed for <br />both the standard reference design and the proposed design. <br />g. For a proposed design with a nonstorage-type water heater, a 40-gallon storage- <br />type water heater with the prevailing federal minimum energy factor for the same <br />fuel as the predominant heating fuel type shall be assumed. For the case of a <br />proposed design without a proposed water heater, a 40-gallon storage-type water <br />heater with the prevailing federal minimum efficiency for the same fuel as the <br />predominant heating fuel type shall be assumed for both the proposed design and <br />standard reference design. <br />h. For residences with conditioned basements, R-2 and R-4 residences and <br />townhouses, the following formula shall be used to determine glazing area: <br /> AF = As × FA × F <br /> where: <br /> AF = Total glazing area <br /> A=Standard reference design total glazing area. <br />s <br /> FA = (Above-grade thermal boundary gross wall area)/(above-grade boundary wall <br />area + 0.5 × below-grade boundary wall area). <br /> F = (Above-grade thermal boundary wall area)/(above-grade thermal boundary <br />wall area + common wall area) or 0.56, whichever is greater. <br /> and where: <br /> Thermal boundary wall is any wall that separates conditioned space from <br />unconditioned space or ambient conditions. <br /> Above-grade thermal boundary wall is any thermal boundary wall component not <br />in contact with soil. <br /> Below-grade boundary wall is any thermal boundary wall in soil contact. <br /> Common wall area is the area of walls shared with an adjoining dwelling unit. <br /> L and CFA are in the same units. <br />SUPP. 9 (1-2021) <br />5E-25 <br /> <br />