Yellowknife takes steps to reduce its environmental footprint
By Beth McKay
The city's Multiplex has undergone a technological upgrade to save energy.
“So far the ice appears to be better. We have only had compliments about the arena, I mean, it would be nice to save some money, but right now, there’s been no complaints about the ice,” said Hurley. Though bids for systems are confidential, Gervais expected the payback for the vortex degasser to take less than a year, noting that the system has not been active long enough to validate savings at time of print. According to a press release from the City of Yellowknife, an estimated $16000 should be saved each year in Yellowknife because of the vortex degasser technology.
HOW DOES IT WORK
The Measurement & Verification (M&V) Result report from FortisBC, explains that Vortex technology is a compact piping system, which removes air bubbles and filaments from the resurfacing flood water through cavitation instead of thermal activation. The resurfacing water is forced through guide vanes creating a pressure gradient to separate air bubbles and filaments from the potable water. As a result, vortex-treated water does not have to be heated to the high temperature as traditionally done before applying the water to the ice surface. This generates thermal and electricity savings through:
• reduction in thermal energy by significantly reducing the need to heat up resurfacing water; and
• reduction in electricity for the operation of the ice rink refrigeration plant as: vortex generated resurfacing water creates a lower refrigeration load since low temperature water is applied to the ice surface for ongoing resurfacing and the initial ice buildup; and the ice rink slab temperature is raised to allow the vortex generated resurfacing water to freeze at an appropriate rate. See www.realice.ca/tag/fortis-bc/ for more details.