ASHRAE Journal - March 2015 - 85

2015 ASHRAE TECHNOLOGY AWARD CASE STUDIES

TABLE 1 Electrical consumption for the Westhills Recreation Complex.

TABLE 2 Payback for the energy efficiency features, including energy sharing.

MONTH

KILOWATT HOURS BILLED

COST

Annual Reduction in Natural Gas Consumption

$46,928.96

January 2014

111,070

$7,478.26

BC Hydro's Calculated 259,751 kWh Annual Savings with VFDs

$15,585.00

February 2014

104,304

$7,084.41

Refrigeration and Air Conditioning Energy Efficiency Improvements

$5,718.00

March 2014

91,074

$6,060.16

Total On-Site Energy Savings

$68,231.96

April 2014

94,609

$5,563.04

Off-Site Energy Value Sent to Housing Development

$41,470.00

May 2014

75,168

$6,095.84

Total Energy Savings

$109,701.96

June 2014

62,157

$4,087.19

Net Cost Over Conventional System

$308,988.00

July 2014

56,600

$3,827.70

Payback on Energy Efficiency Components

2.81 Years

7 Month Total

594,982

$40,196.60

Actual Meter Reading Credit

146,850

$10,272.17

Actual Energy Consumed

448,132

$29,924.00

Monthly Average

64,016

$4,274.92

Extrapolated to 1 year

768,192 Annually

$51,294.04

once the on-site geothermal field is satisfied and all of
the zones are within their programed range, the remaining 60% of the heat is transferred via a VFD-driven
pump to a growing housing development 400 yd (366 m)
away as an energy source for the household heat pumps.
The VFD is temperature controlled and programmed

to maintain the ice rink energy loop at 80°F (27°C). A
brazed plate heat exchanger provides a fluid separation
between the housing development energy loop and the
ice rink energy loop. There are just under 500 homes in
the housing development, so the waste energy is only
able to provide a portion of the required heating energy
in winter. This results in absolutely every bit of waste
energy being used from the two ice surfaces and skating path during the winter. This scenario is much easier
to control in comparison to a situation where there
is too much heat that must be diverted to an outdoor

www.info.hotims.com/54426-3
MARCH 2015

ashrae.org

ASHRAE JOURNAL

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ASHRAE Journal - March 2015

Table of Contents for the Digital Edition of ASHRAE Journal - March 2015

Contents
ASHRAE Journal - March 2015 - Intro
ASHRAE Journal - March 2015 - Cover1
ASHRAE Journal - March 2015 - Cover2
ASHRAE Journal - March 2015 - 1
ASHRAE Journal - March 2015 - 2
ASHRAE Journal - March 2015 - Contents
ASHRAE Journal - March 2015 - 4
ASHRAE Journal - March 2015 - 5
ASHRAE Journal - March 2015 - 6
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ASHRAE Journal - March 2015 - Cover3
ASHRAE Journal - March 2015 - Cover4
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