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<br />. <br /> <br />. <br /> <br />. <br /> <br /> <br />Nelson-Rudie & Associates, Inc. <br />Structural - Mechanical - Electrical <br />Consulting Engineers <br /> <br />2575 University Ave. West <br />Suite 135 <br />St. Paul, MN 55114 <br /> <br />September] , 2004 <br /> <br />Mr. Jeffrey A. Beahen <br />Chief of Police <br />City of Elk River Police Department <br />13077 Orono Parkway <br />Elk River, MN 55330 <br /> <br />Re: Elk River Public Safety Building <br />Elk River, MN <br />NRA Project No.: 02-009 <br /> <br />Dear Jeff: <br /> <br />We have reviewed your letter dated July 20, 2004 along with the gas utility bills and the <br />Commercial/Industria] Energy Audit dated April] 7, 2004 which you sent to us. You indicated <br />that you had some difficulties with your geo-thermal heating system during the winter months <br />and that your biggest concern is the "massive amount of natura] gas that the building is <br />consuming especially since gas is not being used as a primary source of fuel for the heating <br />system. " <br /> <br />We reviewed the original design ofthe heating system for the building and although the building <br />is heated with a geo-thermal system which uses electricity as its energy source, a significant <br />amount of heating for the building is being supplied by natural gas. The total connected heating <br />load for the geo-thermal heat pumps is approximately 680 MBH. The total connected load ofthe <br />natural gas heating system is 2] 58 MBH, not including the gun range unit. This total includes <br />665 MBH for heating in the Apparatus Bay and Garages, 743 MBH for the Apparatus Bay and <br />Garage Make-up Air units, and 750 MBH for the Budding Ventilation Unit. <br /> <br />Table A below indicates our estimate of the natural gas the building will consume and the <br />associated costs based on the current cost of $0.86 per CCF of gas used. As you can see from the <br />Table, the worst month would be January with an estimated gas usage of39]2 CCF and a cost of <br />$3,364.52 and the annual estimated total would be ]9,707 CCF with an estimated cost of <br />$] 6,948.32. These estimates do not include the consumption and costs for the gun range <br />ventilation system which will be operated periodically during the year. <br /> <br />Dennis A. Nelson, P.E. <br />Scott F. Rudie. P.E. <br />Andrew N. Erdmann, P.E. <br />Joseph M. Pearce, P.E. <br />M~hael D. WoeMe, P.E. <br /> <br />Tel: (651) 644-2400 <br />Fax: (651) 647-4120 <br />WNW.nelsonrudie.com <br />