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� �� <br /> I �� �� <br /> �� <br /> � R b N K L I N ��,� F��rLt�A�cr�� FH�:��; nzi-t.;�� <br /> ENGINEERINt� `.��tPzo2 F,�42582�-E_:.z <br /> •' �eland LVA �8033 hvt,c��'rarklinera:�^� <br /> �-s:c!i����::':��,i_corisu��rir::; <br /> U-value Calculation for "Vented" T-bar Ceiling with Light Fixtures <br /> R-19 Batts R-25 Batts <br /> U-value Area UA U-value Area UA <br /> Vent Gap 7.13 0.2916 0.330 Vent Gap ?.13 0.2916 0.330 <br /> Insulation R-19 0.05 93.0084 4.650 Insulalion R�25 0.04 93.0084 3.720 <br /> Total UA 4.980 Tatal U� 4.050 <br /> Average U-value= U,= UNA U, = 0.053 Averaye U-value= U, = UA/A Uo= 0.043 <br /> R-19 balis R-25 batts <br /> R-30 Batts R-38 Batts <br /> U-value Area UA U-value Area UA <br /> Vent Gap 1.13 0.2916 0.330 Vent Gap 1.13 0.2916 0.330 <br /> Insulation R-30 OA34 93.008A 3.162 Insulation R-38 0.026 93.0084 2.418 <br /> Total UA 3.492 Tolal UA 2J48 <br /> Average U-value= U,= UA/A U, _ 0.037. Average U-value = U,= UWA U;= OA29 <br /> R-10 batts R-38 batts <br /> BacHc�round Calculations <br /> Vent Gap <br /> Size. 7/8"tiide by 48" Icng U-value of vent gap: <br /> � Area=7/8 x 48= 42 inZ Assume R=0.88, 1/R=U=1.13 <br /> 42 in2/14v in2= 0.2916 f�z <br /> Vent Ga Area = 0.2916 ftZ � U-value of Vent Gap = 1.13 <br /> l.ight Fixtures InsulaSion <br /> Assume: I Area of insulalion <br /> 112 watts/fixture Z = area of Light FixWres-area of Vent Gap <br /> 1.2 wattsl�t` Q3 j f� � Area of insulalion = 93.3- 0.2916 <br /> 1 Light Fixture per 93.3 it2 I Insulatian Area = 93.00841t2 <br /> I. <br /> � <br /> ;, . � <br /> % � � ,, <br /> � <br />