INFORMATION 11-07-2011 - Laserfiche WebLink

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ENERGY, WASTE MANAGEMENT ASSESSMENT Electric Bitts A review of the electric bills for the year is provided below; 1. The overall electric rate, including all fees, taxes, demand charges, etc., was $0.096 per Kwh, a high rate, 2. Kwh usage and demand both peaked during summer months, probably due to air conditioning loads, 3. Demand varied significantly from a high of 128 Kw in June to a low of 72 Kw for both January & February. Again, this is probably caused by AC loads during summer months, 4. The average load factor (LF), was 46 percent,:which is considered "fair". A."good" LF would be 50 percent or better. (See Section 7: Glossary, for a discussion of LF and other terms used in this report), 5. The $0.90 per square foot of space for the year is slightly higher than the M-3 baseline number of $0.84. RETAP recommends that the City discuss with Utility Representatives, ways to reduce demand and Kwh usage to increase load factor and reduce electric bills. Fuel Bilts A review of fuel bills is provided below; 1. The average therms used during June, July and August, when no heating should be required, was 967 therms/month, indicating this fuel was used for water hea#ing, which is a significant amount for this purpose, 2. The fuel used was above DOE Benchmarks and also the MN B-3 Benchmarks, 3. The overall unit cost for 2010 fuel use was $0.794 per therm. Building Envelope Add insulation to the rooflceiling to increase the ~R" value from about 22 now to 40. This could be accomplished by adding 3 inches of polyisocyanurate foamboard, or 4 inches of polystyrene or 5 inches of fibrous glass board or 8 inches of fiberglass Batt insulation. This would reduce the fuel consumption-for heating by about 5,200 therms and electrical energy for cooling by about 10,900 kWhr for the year evaluated, for a total of about $5,749 per year. Consider some type of treatment for the aluminum window frames to reduce the conductance of thermal energy (cold), from the windows. Potential savings are negligible but the comfort level would/could be improved. H~AC Consider improvi^g he overall efficiency of the HVAC system from about 72 percent (heating), to 90 percent, by evaluation of the equipment and controls, conducting a recommissioning study if feasible and replacing old-equipment with new, high efficiency equipment. Estimated energy savings would be 2,480 kWhr electrical energy and 5,320 therms of fuel. Dollar savings would be about $4,465 total, per year. This analysis could/should include, bu# not be limited to, consideration of age and maintenance of .-------®_ Page 5 of 9 , ~~---