Zero on the Score Board: The Energy Future of Ice Rinks

From competitive sports to recreational activities in the winter (i.e. ice skating), hockey rinks are found across North America and with expanding economic powers like China beginning to construct ice rinks, energy consumption by sporting events is poised to increase. Ice rinks in general are energy hogs in somewhat obvious mechanisms of pumping coolant and refrigeration. However, major inefficiencies can be found in older systems regarding a less obvious measure – heating. In order to keep spectators comfortable, ice rinks will often keep air temperatures closer to 60°F.

This is unsurprisingly, not the best method to keep ice at optimal conditions. Even simple changes like reducing air temperature from 60°F to 40°F have been found to provide energy savings of 25 to 50%. Touchstone Energy even claims that adding a heat recovery system to an ice rink can realize up to 75% in energy savings. Theoretically, waste heat from the refrigeration condenser could be used in domestic water heating, subfloor heating, floodwater heating, ice melting, and preheating cold outdoor air for ventilation. However, many older rinks are in arenas that cannot undergo such upgrades to facilitate these uses at a feasible cost.

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Above: ASHRAE comparison of rink energy consumption by percentage.

It’s not all gloom and doom though as the National Hockey League (NHL) at the professional level and a multitude of community rinks at the local level have shifted towards using more energy efficient means. While these are still in the developing stages of getting to a net zero status, the methods are wide ranging and can be used as case studies for future rinks. Harold Mayhew, an architect who specializes in skating rinks finds himself on the forefront of making ice rinks more efficient (and more recently with the goal of net zero). Mayhew designed the ice rink at Maine’s Bowdoin College, which opened in 2009, that became the nation’s first hockey rink to be LEED certified. He is currently undertaking the task of moving Woodstock, Vermont’s Union Arena toward the lofty net zero goal. Beginning in late 2016, the arena is upgrading the existing equipment, finding ways to reuse waste heat from the compressors, and buying solar panels to chip away at the energy bill that almost contributed to the rink potentially folding. Early efforts have already dropped the monthly energy consumption by 12.5% compared to the same time period in the previous year.

A couple of other interesting rink upgrades are also found up north. Falmouth High School in Massachusetts has installed around 4,400 solar panels on the roof of the rink and in a nearby parking lot that add up to about 1MW of capacity to cut down their utility costs. The Marcel Dutil Arena in Quebec trail-blazed their rink upgrades by going to a 100% CO2 – based refrigeration system (uses CO2 as the working fluid). By using CO2 the arena avoided the need for a secondary working fluid and saved energy in the design by not needing large pressure inputs into the system to chill the ice. More traditional rinks use ammonia or Freon chillers, and glycol or brine as secondary fluids.

falmouthrink.jpg

Above: Falmouth Ice Arena’s solar array can provide power of about 1MW in capacity to help cut down on utility costs (this is enough power for around 164 homes).

The NHL Green initiative was a major push by the league back in 2011-2012. Big pushes on social media fronts established that the NHL was looking to be the face of professional sports going green. Ultimately, the league has made strides since then, but maybe has not become very well renowned for its efforts. The NHL boasts that it is the “1st professional sports league to issue an environmental sustainability report” and the “25th largest user of green power in the United States,” among many other commendable measures. That being said, the league still emitted 408 metric tons of CO2 per game in 2014. While this is a slight improvement from around 416 mtons back in 2011, that is still an annual emission of 528,322 mtons CO2. This would seem miniscule to Plant Scherer (coal power plant) in Juliette, GA whose emissions were 17.7 million mtons in 2016, but then again Scherer is generating electricity that may very likely be powering ice rinks in the state (the old Macon Centreplex in particular).

nhlsusreport

Above: The NHL according to their 2014 Sustainability Report indicate that they are working to mitigate their current emissions that add up to 55 pounds CO2 emissions per sq. ft.

As a caveat, Mayhew said in discussions with people who work in the ice rink industry across the continent and beyond that no one is aware of any other facility looking to make their energy bill completely zero. Ultimately, the electricity bill will eventually force the hands of many establish rinks. From building construction to upgrading lighting to optimizing ice thickness, there are several areas where improvements can be made. The following quote from Mayhew sums up the situation quite nicely “If you can make a hockey rink a net zero building, you can make anything net zero.”

So what does everyone think? Are upfront economic costs the main driver as to why we do not see wholesale changes happening in ice rinks? Or is it more of the rink managers not researching proper methods to save money? Are there other aspects of ice rinks you believe could be looked at either at small community rinks or at large city arenas?

Sources and Further Reading:

Managing Energy Costs in Ice Rinks:
https://bea.touchstoneenergy.com/sites/beabea/files/PDF/Sector/Ice_Rinks.pdf

World’s First CO2 Ice Rink:
https://www.ashrae.org/resources–publications/periodicals/ashrae-journal/features/ice-rink-uses-co2-system

Ice Rinks vs. Energy Bills:
http://www.chicagotribune.com/sports/hockey/ct-ice-rinks-energy-bills-20161226-story.html

Union Arena and Sustainability:
http://unionarena.org/project/sustainable-arena-campaign/

NHL Green – By the Numbers:
https://www.nhl.com/info/nhl-green/by-the-numbers

NHL Green – 2014 Sustainability Report:
http://ice.nhl.com/green/report/#environmentalImpact

Plant Scherer Emissions:
https://ghgdata.epa.gov/ghgp/service/facilityDetail/2016?id=1001051&ds=E&et=&popup=true

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10 thoughts on “Zero on the Score Board: The Energy Future of Ice Rinks

  1. Before reading this, I had never considered the massive amounts of energy consumed by ice rinks, especially in warmer weather areas. I think this is a push in the right direction not only for ice rinks, but for sporting venues in general. I have to agree with Mayhew when he says: If you can make a hockey rink a net zero building, you can make anything net zero. I was shocked that in this article, they even considered s net-zero ice rink, as I imagine the input to keep the ice frozen while also keeping the spectators at a comfortable temperature must be an energy-inefficient process. Hopefully this sort of innovation will set an example for the future sporting arenas in the US.

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  2. I never really thought about ice rinks when talking about building sustainability before, but they are a very unique problem. The ideas to just put the waste heat from the refrigeration line into the indoor environment or into domestic water heating is a great idea. However, at the end of the day, it is inherently inefficient use of energy to have and maintain an ice floor in a room well above freezing. I think any effort to incorporate renewable energies to run the rink is noble, but it will come down to whatever is cheapest, and ultimately what the fan base there is in the area.

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  3. Really interesting blog! I have never considered the environmental costs of watching a sporting event. All the lights, sound systems, HVAC, etc. that goes into a sporting event is incredible to think about, especially ice rinks that require specific conditions to produce the ice. Unfortunately, I think the economic costs associated with optimizing rink energy uses, is slowing down progress. Current rinks can’t start initiatives to become net zero because its just too expensive to make the upgrades. As people prove that sporting arenas can become net zero I think future stadiums, rinks, and arenas will be designed with energy efficiency in mind.

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  4. Thanks for sharing Alex. From past experiences at hockey rinks, I can see how the dilemma of trying to keep the crowd warm can be an energy hog, given that you also have to keep the ice cool. I think it is a mixture of rink managers not researching proper methods to save money, and a lack of money for capital investments. In my hometown, the ice rink has always struggled to get by. That would lead me to beleive that they don’t have the money or want to take the risk on a big initial investment, even if it might pay off down the road.

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  5. Thanks for sharing this! The sustainability of ice rinks is not something I had ever really thought about but it really makes you consider the different environmental impacts of all sporting events! While hockey seems like it is pretty unique in its energy requirements I’m sure there is huge room for improvement in all sports. Professional sports are in a really cool position in that they have the power to reach a wide audience so it would be cool to see more sports take steps towards being positive role models for sustainability!

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  6. Great topic! Like others, I had never thought of the immense amount of energy required to keep the crowd warm and simultaneously keep the ice cold. Let’s be honest, no matter the energy costs- entertainment sports will never be threatened in the US. I think that this effort by the NHL and even local rinks that you mentioned should be applauded for being able to keep consumers happy while simultaneously being energy conscious. It would be great to see more sports venues across the nation follow the NHL’s lead.

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  7. This is a really great topic. Many including myself never really thought about the amount of energy that goes into power an event like this. I think that many rinks that are not as efficient are not able to become more greener due to the cost. Upgrades in technology are very expensive and occur very often so it seems to me like as soon as many of the smaller rinks as soon as they made these changes there would be new technology available.

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  8. Interesting article. I have never thought about the massive amount of energy needed to maintain a hockey rink. I’m glad to see that steps have been taken to combat this issue.

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  9. Interesting article that not many people would probably think about unless they read this. A part of me wants to tell viewers of hockey to suck it up and wear a sweater. You’re watching hockey, man up. But that wouldn’t really solve anything. I found it interesting about the goal to create a hockey rink that was LEED certified. I think it is very possible. The roofs on hockey stadiums would be great for solar panels. Also, with a round shape, there could be methods of using wind as a cooling system the way Google is doing in their new building in California. It allows air to enter through many vents at all angles and circulate through the building from 360 degrees. I think this could be a great application for hockey stadiums due to their round shape.

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  10. I think this issue really highlights the dilemma of superfluous waste in America. Something like an ice rink… It’s an unfathomable luxury. To have the heating on as the ice is constantly being frozen, that feels really excessive. I wonder if some rinks should be closed? I am not a hockey fan but my good friend played it. I understand why it is so appealing, but it is a problem. Do other sports have similar issues with stadium expenses and operations? Would it be better to have some bigger rinks, but less of them? Or maybe only operate recreational ones in the winter. I feel like some sacrifices should be made.

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