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

Home Browse Search

annually on the demand charge. That's $5,855 annual savings on just the one rink. If current lighting levels are not presently adequate, 10 lamp T-5 fixtures with high output lamps (540 watts actual) could be used. That means reduced savings but it may correct deficit lighting if it exists. There's also a possibility for greater savings through bi-level control, meaning that light output of each fixture can be reduced for different activities on the ice! Converting the 400 watt metal halide fixtures (460 watt actual) in the old rink to 6 lamp T-8 fixtures (222 watts actual) will increase the lighting level, and it will accommodate bi-level lighting as well. Annual energy savings will be $1,934 and annual demand savings will be $1,544, for a total savings of $3,478. Additional savings could be achieved through bi-level control. According to information furnished, the lead compressor in the Olympic Rink does nearly all the ice making @ 4403 hours per year. The lag compressor was on for only 22 hours. Since both lead and lag compressors are on simultaneously that cost an extra $4075 for only 22 hours run time. Those are mighty expensive kilowatt-hours! Interlocking them so only one can be on at a time should save $4075 per year if future years have the same use profile. The same holds true for the old rink. However, use of the lag compressor increases to 198 hours per year. While interlocking the lead and lag compressor is possible, it may not be practical. If it is, this could save $3,428 per year if future years have the same use profile. Another possibility is to install standby generation to provide power to the lag compressors. That way they can't contribute to your billing peak and you can run them at critical times -long payback though! Considering the usage patterns, perhaps variable frequency drives could be installed on the lag compressors so they don't operate on full load when only partial load is required. This option also has a long payback! Still another consideration is participating in our Dispersed Generation Program. If you would install a 3501cW generator (enough to carry the entire load of both rinks), you could qualify for a dispersed generation credit form us. That credit would be in the magnitude of $10,000 to $15,000 per year. The reason for the range is due to the uncertainty of the contribution of your monthly demand to our monthly billing peaks. We need to collect data on that before being specific on the credit amount. We previously looked at a credit based on 175 kW which computes to $11,300 credit per year. Combining lighting retrofit as recommended with the dispersed generation credit could save nearly $20,000 per year. Use the generator to pick up the Olympic Rink lag compressor run time, and the savings could approach $25,000 per year. No attempt was made to explore all the possibilities on the gas side, but just zoning the radiant heaters to reduce gas use to match the size of the spectators load will save both gas use and compressor run time.