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Real Energy Saving Case Study
I do a lot of roll-out Architectural work. In case you don't know what that means, it is when a client needs a lot of the same buildings all over the county. This work is mostly for restaurant architecture but this case study is about 2 banks. One of the most interesting things about this type of work is when I get to do experiments, making variations in the building and comparing the results. This is the story of one of those experiments. I think you will find the results interesting. I had the chance to build 2 nearly identical banks in the Chicago area. The buildings in question were about 4,[link widoczny dla zalogowanych], 100 square foot retail branch banks. The first one was located in Deerfield, IL and was a good quality commercial building that met all energy codes. The building had a steel frame infilled with 6 inch metal studs, filled with 6 inch fiberglass insulation for the walls, the roof was metal deck and bar-joist with 3 inches of insulation board. The second bank was in Wheaton IL about 20 miles away, so both building get the same weather. We only changed 3 elements, the buildings were other wise identical. One, the wall insulation was changed to foamed in place low density polyurethane,[link widoczny dla zalogowanych], this changed the wall insulation value from about R-18 to about R-20 but the air infiltration into the building drops to almost nothing with the foam because it expands and sticks to everything. Two,[link widoczny dla zalogowanych], we doubled the roof insulation from 3 inches to 6 inches, increasing the insulation value from R-18 to R-36. Third,[link widoczny dla zalogowanych], we changed the windows from 1 inch clear low-e sealed glass units to tinted low-e 1 inch sealed glass units. Each item was bid as an additive alternate so we could obtain hard numbers for what each item cost and not just rely on estimates. The foamed in place insulation in the walls cost an additional $9, 150. The thicker roof insulation cost an additional $5, 300. The tinted glazing cost an additional $3, 800. The grand total for all three alternatives was $18, 250 or put another way $4. 45 a square foot. To complete the experiment I tracked the energy usage for a year and put together a comparison chart to ensure it was money well spent. You can judge for yourself, but I think the results are stunning. Gas consumption was cut by 62% and electrical consumption was cut by 25% that is a saving $5, 090 in the first year. That is $424 a month every month. People always ask the wrong question when it comes to energy conservation. They ask how long is the payback. The answer is about 3 years and 7 months. The correct question is what is the affect on cash flow, and the answer is $283 per month for 20 years then it jumps to $424 per month. What, I am talking about is the fact that buildings are financed so $18, 250 is borrowed and then paid back from cash flow, at 7% that is $141 a month for 20 years. $424 in savings take away $141 in dept payment is positive $283 a month. For this calculation I use $0. 09 a kilowatt-hour and $1. 00 a therm, both prices have fluctuated above and below these averages but I don't think it affects the out come on the experiment. Each of these three items thicker roof insulation, tinted glass and foam insulation are now standard for my buildings and with this hard date clients are easily convinced it is money well spent. One more thing the client allowed me to share this data but not their name. I hope you understand. Burt Andrews is an Architect with over 20 years of experience in designing restaurants and retail stores. You can read more of his restaurant ideas at his blog about restaurant architecture archisaur. us. He is a principal at Larson and Darby Group in charge of the St. Charles, IL office.Topics related articles：

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