2007-01-06_PR Comm Packet - Laserfiche WebLink

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Pan coils Fan c 1V Fa" coils i� Heat pptnps � i� Hea7 P—P. 3 Ics Heel p=qs Heal from ice to loop j Heal from ice to building Heat from loop to building Diograin 2 Diagrmu 3 Dfre,ram 4 The Selkirk connection From the very beginning, the Dubuque group looked at the full-size ice arena in Selkirk as a working. "A properly designs host punts system can out energy costs by a factor of four." 0000000 000000 Although the Selkirk I hockey Arena is only one of many geothernal ice rinks built in Manitoba, it is the facility most comparable in size and scope to the proposed Dubuque project with a record of energy use. The Selkirk Arena contains an 85' x 200' ice sheet, a 3000 -seat arena, locker rooms, a banquet ball, offices and a lobby. Only 22,400 square feet of that area is heated to 70". It was completed in 1990 and the ice is in use 10 months out of the year. It operates on an open - loop (pump and dump) geothermal heat recovery system that cost $740,000 to install, including wells, rink piping, and complete installation. The Selkirk Arena is entirely electric. I heat pumps chill the waterimethanol antifreeze circulated under the ice. The heat taken from the antifreeze heats water, which is circulated through fan coil units throughout the building. The heat is also used to heat domestic water supplies and water used to flood the ice. The heat is even used to provide hot air for hand driers in the bathrooms. The well water, at a constant 44°F, is used to maintain ground temperature under the ice to avoid the buildup of permafrost, which can cause the ground to buckle if the soil under the rink is too cold. The well water is also used to preheat and pre -cool the building's interior space. Ed Lohrenz, BES, territory manager with WaterFurnace, Inc., a manufacturer of geothermal hear pumps, has been involved in a number of geothermal curling and skating rinks in Manitoba and British Columbia, including the Selkirk Arena near Winnipeg. Hockey and curling arenas are the most obvious examples of suitable applications (of integrated geothermal systems," said Lohrenz,.. "but many manufacturing plants also reject tremendous quantities of process heat, while bringing in additional energy to heat the building. An integrated system is suitable in any such application where there are simultaneous heating and cooling de€hands, according to Lohrenz. Although the Selkirk Arena has been operating for several years with few problems, improvements in the design of geothermal ice rinks have made other rinks even more efficient. One such change recommended by Lohrenz is that small modular compressor units be used in place of one or two large compressor units as in the Selkirk Arena. The modular nature allows for easy control of peak power demand if needed," explains Lohrenz. "Shutting off two of 12 compressors for 15 minutes would in most eases not affect the ice temperature, whereas shutting off one of two compressors in a hockey rink for the same time would have a mach greater effect." The temperature of the ice shed was another cause for concern. Although the system was originally designed to maintain a constant temperature of 45°F, the spectators were uncomfortably cold in temperatures lower than 55-60° The amount of hot water storage provided by the system was inadequate to meet the arena's needs and two 18kw electric water heaters were added to the system. The ventilation system in the ice shed was also a problem because the ductwork was designed to blow air directly on the spectators, and the air was often cool when heat was not required. Heat pumps make ice plus heat and cool entire building "In order to maximize the efficiency of a geothermal system, you have to integrate a geothermal with proper fluid flow and pump selection," says Greg Jorgensen, president of Creation Engineering International in Winnipeg. "Pump selection and rink pipe layout are crucial," explained Jorgensen. "You can double your energy requirements by having an improper layout of pipes.,' According to Jorgensen, who has built six geothermal rinks in Canada, a properly designed heat pump system can cut energy costs by a factor of four,