5. - 11. ICESR 08-14-2007 - Laserfiche WebLink

Home Browse Search

~/ Elk River Municip al Utilitie s 13069 Orono Parkway Elk River, MN 55330 November 8, 2006 Rich Czech Elk River Hockey Arena 1000 School St Elk River, MN 55330 phone: 763.441.2020 Fax: 763.441.8099 Subj: Results of Energy Use Assessment Conducted by Elk River Municipal Utilities A walk through energy use assessment of the Ells River Hockey Arena was completed on 10/23/06. A summary of data collected during that walk through is attached as Exhibit one. Main electric loads are the metal halide lighting and the ice snaking compressors in both rinks. Main gas loads are the forced air gas furnaces for the offices and locker rooms and radiant heaters used to warm the stands. Hours of use for these loads as furnished by Rich Czech, are attached as Exhibit two. Three years ago we did a similar walk through and recommended converting metal halide lighting in the rinks to fluorescent to save on both demand and energy charges and at least explore the possibility of interlocking the lead and lag compressors so they cannot operate simultaneously to cut down on demand charges. We also suggested considering our Dispersed Generation Program by installing on-site generation. Information on our Dispersed Generation Program is attached as Exhibit three. No recommendations were made regarding the gas use. Not much has changed in our new recommendations but your average monthly demand has increased from 248 kW to 2791cW (17% increase) and annual energy use has increased from 1,031,400 kWh to 1,211,580 kWh (13% increase). No additional equipment was added during this time, so the increase is probably due to increased use. There are some easy fixes to cut energy use in some areas such as zoning the radiant gas heaters used to warm the spectator stands, installing setback thermostats on the forced air heating, and increased use of occupancy sensors. There are also some possibilities for additional zoning of rink lighting for various uses, especially when there are only walkers in those areas. These are relative low cost fixes, but they don't yield significant savings compared to the recommendations that follow. The most significant savings will come from changing out the rink lighting from metal halide to fluorescent. The 1000 watt (1170 watts actual) fixtures in the Olympic Rink can be converted to 81an1p T-5 fixtures with high output lanips (468 watts actual), for an annual savings of 88,938 kWh or $3,610 on the energy charge and 17.3 kW/mo or $2,245