ENERGY Star Score for Indoor Ice Rinks
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Technical Reference ENERGY STAR Score for Indoor Ice Rinks in Canada OVERVIEW The ENERGY STAR score for indoor ice rinks in Canada applies to public or private buildings that include one or more ice sheets used for recreational or professional skating, hockey or ringette. The objective of the ENERGY STAR score is to provide a fair assessment of the energy performance of a property, relative to its peers, taking into account the climate, weather, and business activities at the property. A statistical analysis of the peer building population is performed to identify the aspects of building activity that are significant drivers of energy use and then to normalize for those factors. The result of this analysis is an equation that predicts the energy use of a property, based on its experienced business activities. The energy use prediction for a building is compared to its actual energy use to yield a 1 to 100 percentile ranking of performance, relative to the national population. • Property types. The ENERGY STAR score for indoor ice rinks applies to public or private buildings that include one or more ice sheets used for recreational or professional skating, hockey or ringette. The ENERGY STAR score applies to entire indoor ice rinks, whether they are single buildings or campuses of buildings. • Reference data. The analysis for indoor ice rinks in Canada is based on data from the Survey of Energy Consumption of Arenas (SECA), which was commissioned by Natural Resources Canada (NRCan) and carried out by Statistics Canada, and represents the energy consumption year 2014. • Adjustments for weather and business activity. The analysis includes adjustments for: • Number of full time equivalent workers • Number of months that the main indoor ice rink is in use • Total indoor ice rink size (m2) • Average number of indoor ice resurfacings per rink per week • Number of ice rink spectator seats in the facility • Number of curling sheets in the facility • Weather and climate (using heating and cooling degree days, retrieved based on postal code) • Release date. This is the first release of the ENERGY STAR score for indoor ice rinks in Canada. This document presents details on the development of the 1 – 100 ENERGY STAR score for indoor ice rinks. More information on the overall approach to develop ENERGY STAR scores is covered in our Technical Reference for the ENERGY STAR Score, available at http://www.energystar.gov/ENERGYSTARScore. The subsequent sections of this document offer specific details on the development of the ENERGY STAR score for indoor ice rinks. OVERVIEW ........................................................................................................................................ 1 REFERENCE DATA & FILTERS ....................................................................................................... 2 VARIABLES ANALYZED ................................................................................................................... 4 REGRESSION EQUATION RESULTS .............................................................................................. 7 ENERGY STAR SCORE LOOKUP TABLE ....................................................................................... 8 EXAMPLE CALCULATION .............................................................................................................. 11 August 2017 ENERGY STAR Score for Indoor Ice Rinks in Canada Page 1 Technical Reference REFERENCE DATA & FILTERS The ENERGY STAR score for ice rinks in Canada applies to public or private buildings that include one or more ice sheets used for recreational or professional skating, hockey or ringette. Buildings that are exclusively used for curling are not currently eligible to earn an ENERGY STAR score but can be benchmarked using this property type. The score does not apply to larger facilities primarily serving professional or collegiate functions and with significant spectator seating (≥5,000 seats). These facilities should most likely be benchmarked using the Entertainment/Public Assembly – Stadium – Indoor Arena property type, at https://portfoliomanager.energystar.gov/pm/glossary#IndoorArena. The reference data used to establish the peer building population is based on data from the Survey on Energy Consumption of Arenas (SECA), which was commissioned by Natural Resources Canada and carried out by Statistics Canada in late 2015 and early 2016. The energy data for the survey was from the calendar year 2014. The raw collected data file for this survey is not publically available. Summary results for the entire sector, produced by Statistics Canada, are available online. To analyze the building energy and operating characteristics in this survey data, four types of filters were applied to define the peer group for comparison and to overcome any technical limitations in the data: Building Type Filters, Program Filters, Data Limitation Filters, and Analytical Filters. A complete description of each of these categories is provided in our Technical Reference for the ENERGY STAR Score, at www.energystar.gov/ENERGYSTARScore. Figure 1 presents a summary of each filter applied in the development of the ENERGY STAR score for indoor ice rinks and the rationale behind the filter. After all filters were applied, the remaining data set has 1,195 observations. Due to the confidentiality of the survey data, NRCan is not able to identify the number of cases after each filter. Figure 1 – Summary of Filters for the ENERGY STAR Score for Indoor Ice Rinks Condition for Including an Observation Rationale in the Analysis Building Type Filter – In order to be considered part of the indoor ice rink peer Must have at least one indoor ice rink group, as defined in the survey, the facility must have at least one indoor ice rink, used for hockey and/or skating. Building Type Filter – In order to be considered part of the indoor ice rink peer Must not have more than 25% of the area group, the facility must not have more than 25% of its gross floor area used as a defined as Fitness Centre, Gymnasium fitness centre, gymnasium (including racquet sport courts) and/or indoor and/or Indoor Swimming Pool swimming pool. In Portfolio Manager, these areas would fall under the property use type: Fitness Center / Health Club / Gym. Program Filter – Basic requirement to be considered an indoor ice rink is that it Must have electric energy data requires electrical energy. Electricity can be grid-purchased or produced on site. Must have at least 1 full-time or part-time Program Filter – Basic requirement for a full-time indoor ice rink. There must be worker at least one worker. The main Ice Rink must operate at least 5 Program Filter – Basic requirement to be considered a full-time indoor ice rink months per year Data Limitation Filter – The survey asked whether fuels other than purchased electricity, on-site generated electricity from renewable sources, natural gas, Must not use any “other” fuels for which the heating fuel oil, diesel or propane were consumed in the facility. While the unit of energy value is reported energy was defined, the type of energy was not; therefore the energy content of these fuels could not be directly compared. In these occurrences, these observations were removed from the analysis. Data Limitation Filter – The survey reported the energy for calendar year 2014. Must be built in 2013 or earlier Therefore, if the facility was built in 2014, a full year of energy data would not be August 2017 ENERGY STAR Score for Indoor Ice Rinks in Canada Page 2 Technical Reference Condition for Including an Observation Rationale in the Analysis available. Data Limitation Filter – The survey asked whether the energy reported at the facility included energy supplied to outdoor pools, sports fields, exterior bubble Must not have reported energy to other domes, tennis courts, or annex buildings. The energy consumption for these buildings usages could not be quantified. In the cases that reported energy was supplied to one of the described uses, the cases were removed from the analysis. Data Limitation Filter – The survey asked if all the energy used at the facility was Must have reported all energy used in the reported. In the case that part or all of the energy consumed at the facility was facility not reported or missing, these cases were removed from the analysis. Must have a worker density less than or Analytical Filter – Values determined to be outliers based on analysis of the data. equal to 0.75 full-time equivalent workers Outliers are typically clearly outside normal operating parameters for a facility of per 100 square metres this type. Must have a rink area–to–building area ratio Analytical Filter – In order to be considered part of the indoor ice rink peer group, smaller than or equal to 90% the ice surface cannot constitute more than 90% of the building area. Must have a spectator seating density less Analytical Filter – Values determined to be outliers based on analysis of the data. than or equal to 200 spectator seats per Outliers are typically clearly outside normal operating parameters for a facility of 100 m² this type. Must have an average weekly number of Analytical Filter – Values determined to be outliers based on analysis of the data. resurfacings per rink less than or equal to Outliers are typically clearly outside normal operating parameters for a facility of 110 this type. Analytical Filter – Values determined to be outliers based on analysis of the data. Must have a spectator seating capacity less Outliers