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Home My WebLink AboutNORTH LEMAY PLAZA PUD - FINAL - 57-87A - CORRESPONDENCE - APPLICANT COMMUNICATION■ n� GEFROH HATTMAN INC. ARCHITECTS/PLANNERS CONSTRUCTION MANAGEMENT 135 West Swallow Road Fort Collins, CO 80525 January 1 1 , 1988 (303) 223-7335 Mr. Felix Lee City of Fort Collins Director of Building Department Box 580 Fort Collins, CO 80522 RE: NORTH LEMAY P.U.D. Dear Mr. Lee: �r i' gees --JV The information submitted with this letter is being forwarded to your office for review through the Planning Department. This information is provided as documentation to support this project request of energy related points within the Planning process. The project consists of two buildings -- one, a 2604 sq. ft. convenience store; the other, a 10,672 sq. ft. retail building. The construction techniques for both buildings will be similar. Each will be single story in nature, 2"A'' framing wall with brick veneer slab on grade floors and wood truss pitches roof framing. There are two separate points charts submitted for this project: A points chart "D" for road side and auto related commercial and a points chart "E" business service uses. On both charts we are requesting 4 points out of a possible 8 points or 50% of the total energy points allowable for such a complex. The following is a review of Chapter 6 of the model energy code for the City and State. It is our contention that by designing a more thermally efficient build- ing envelope that this can reduce the non-renewable fossil type fuel consumption of this project to warrant credit for these points. The following summary of the two thermal envelopes demonstrates an average of 40% savings of energy through a heating season which we think is a substantial savings over and above the base line requirements set by City standards; therefore, warranting the points being granted. The following is our findings. S i nce re y you •��is��sriz�°• a•• V VC F edric F�eJ. Haftm V ice Pres, dent kam rr.-1637 e cc: Ted Shepard °°o`'Q0 AR'��`�, 41/U 11 I II a'�••• MODEL ENERGY CODE COMPLIANCE CONVENIENCE STORE NORTH LEMAY P.U.D. BUILDING ENVELOPE Building Footprint 26o4 Sq. Ft. Building Dimensions 62X42 Floor to Ceiling Height of Heated Space 10 Ft. Temperature Differential 72° F. Heating Season 6600 Degree Days CODE COMPLIANT - Base Data For This Building Table Values of Surface Aggregate Walls U = 0.26 Roof/Ceiling U° = 0.07 Slab R° = 5.4 BASE CRITERIA U Wall X Area Wall + U Roof X Area Roof Building U0 = 0 0 SURFACE AREA = 0.26 X 2080 + 0.07 X 2604 4684 0.15 SPECIFIC BUILDING - Envelope Value Wall Face Brick R = .75 Insulated Sheathing R = 2.50 Air Space R = 1.01 Batt Insulation R = 19.00 Wood Studs R = 6.875 Gypsum Board R = 0.45 Assume 14% of Wall is Solid Wood Framing R = 11.58 Assume 86% of Wall is Filled With Insulation R = 23.71 Glass Store Front Aluminum Frame and 1" Insulation Glass U = .49 Wall Surfaces 540 Sq. Ft. Glass tore Front 216 Sq. Ft. Solid Wall 1324 Sq. Ft. Void Wall Wall U0 = UG X Glass Area + USW X Solid Wall Area + UVW X Void Wall Area Surface Area = 0.49_X_540 + 0.086 X 216 + 0.042 X 1324 2080 338.77 2080 .16 A MODEL ENERGY CODE COMPLIANCE NORTH LEMAY P.U.D. Page 2 Roof/Ceiling Suspended Ceiling R = 1.78 MR Space R = .94 Truss R = 6.875 Insulation R = 40.00 Assume 14% of Roof is Framing R = 9.59 Assume 86% of Roof Space is Void R = 42.72 Uo Roof = UR Area Truss + UR X Area of Insulation Roof Area 0.104 x 364. + 0.023 X 2240 2 0 + .034 Overall Envelope U Values = UW X AW + UR + A SURFACE AREA .16 X 2080 + .034 X 2604 46 Uo = 0.09 Base Data Uo = 0.15 ENERGY CONSUMPTION- At design differential Base Data AS X Uo X At = BTUH 4684 X 0.15 X 72 = 51936 BTUH Building as Designed AS X Uo X At = BTUH 4684 X 0.09 X 72 = 30352 BTUH ENERGY CONSUMPTION - Seasonal Base Data AS X Uo X DD = MBTU/Season 4684 X 0.15 X 6600 = 4,760 MBTU/Season = Building as designed AS X Uo X DD = MBTU/Season 4684 X 0.09 X 6600 = 2782 MBTU/Season = 2782 MBTU = 58% 7�+ 6o MBTU - Percent of Fuel Savings 42% Per Season 4 MODEL ENERGY CODE COMPLIANCE RETAIL STORES NORTH LEMAY P.U.D. BUILDING ENVELOPE Building Footprint 10,672 Sq. Ft. Building Dimensions 70 X 160 Floor to Ceiling Height of Heated Space 10 Ft. Temperature Differential 72° F. Heating Season 6600 Degree Days CODE COMPLIANT - Base Data for this Building Table Values of Surface Aggregate Walls U = 0.26 Roof/Ceiling U° = 0.07 Slab R° = 5.4 BASE CRITERIA Uo = U° Wall X Area Wall + U° Roof X Area Roof SURFACE AREA 0.26 X 4600 + m7 X 1o,672 15,272 Uo = 0.127 SPECIFIC BUILDING - Envelope Value Wall - Face Brick R = .75 Insulating Sheathing R = 2.50 Air Space R = 1.01 Batt Insulation R = 19.00 Wood Studs R = 6.875 Gypsum Board R = 0.45 Assume 140 of Wall is Solid Wood Framing R = 11.58 Assume 86% of Wall is Stud Space R = 23.71 Glass Store Front Aluminum Frame and 1" Insulating Glass UG = .49 Wall Surfaces 1400 Sq. Ft. Glass 448 Sq. Ft. Framing 2752 Sq. Ft. Stud Space UW = Uc X A Glass + OF X A Framing + US X A Space 600 Sq. Ft. _ o.49 X 1400 + 0.089 X 448 + o.o43 X 2752 600 Sq. Ft. 0.034 0 • MODEL ENERGY CODE COMPLIANCE RETAIL STORES NORTH LEMAY P.U.D. Page 2 Roof/Ceiling - Suspended Ceiling Air Space Truss Truss Space Insulation Assume 14% of Wall is Solid Wood Frame Assume 860 of Insulated Space R = 1.78 R = .94 R = 6.875 R = 40.00 R = 9.59 R = 42.72 U0 Roof = UR X A Truss + UR X A Insulation Roof Area 0.104 x 1494 + 0.023 X 5178 10, 672 Sq. Ft. 0.034 Overall Envelope U Value = UW X AW + UR + AR Surface Area 0.18 x 4600 + 0.034 X 1o,672 15,27E Sq. Ft. U = 0.078 0 Base Data U0 = 0.127 ENERGY CONSUMPTION - At Design Differential Base Data - A X U X At = BTUH 15�9274ox 0.127 x 72 = 139,665 BTUH Building As Designed - A X U X At = BTUH 15,274oX 0.078 X 72 = 85,778 BTUH ENERGY CONSUMPTION - Seasonal Base Data - A X U X DD = MBTU/Season 1�,2740X 0.127 X 6600 = 12,802 MBTU/Season = Building As Designed - A X U X DD = MBTU/Season 1�,274oX 0.078 x 6600 = 7863 MBTU/Season = 7,863 _ 610 12,802 Percent of Fuel Savings 39% CONCLUSIONS: The code calls for slab on grade to have a perimeter insulation R = 5.4. Using a dow SM board 1�" thick, the insulation value is R = 7.5. The perimeter edge loss is 50% higher than code standard for purposes of these cal- culations of energy savings. This differential in values was negated in order to establish values for the envelope subject to air to air heat loss. The decrease in fuel consumption due to the increase in thermal value for the exposed envelope shows a measured reduction in fossil fuel required for these structures over City standards. Values approaching 40% were achieved by both buildings which we feel warrant the allowance of 4 points for energy conservation for each Point Chart.