ASHRAE Journal - August 2011 - 44

ASHRAE’s BEST
SEcond plAcE: HEAlTH cARE fAciliTiES, ExiSTing

hospital upgrade
By Jack Kafesdjian, Eng., Member ASHRAE

Heat Recovery, Geothermal Save Energy

M

ontreal’s Louis-H. Lafontaine Hospital is a 140-yearold psychiatric hospital that at its peak housed as

many as 5,000 patients. Historic buildings of this type offer many opportunities for energy savings. Designers identified 26 energy-saving measures for the 1.5 million ft2 (139 355 m2) hospital, and the hospital administration selected 18 based on available funds (see Energy Saving Measures sidebar). The initial energy efficiency study performed in 2005–06, revealed that the annual energy consumption for the hospital in the previous year was approximately 64 million kWh (230 400 GJ) or 44 kWh/ft2 (473 kWh/m2) at $0.04/kWh ($11.11/GJ). This equated to roughly $2.4 million in annual energy costs (in 2003–04 dollars) and was split between three energy sources: natural gas (70%); electricity (18%) and fuel oil (12%). The study showed that the annual energy savings potential was roughly $850,000. The construction costs were estimated at $6 million, and the original project payback period was seven years (maximum allowable for government funding). The financial savings estimated for this project are based on the following utility rate structure (from 2006): • Electric demand: $12.60/kW; • Electric consumption: $0.0256/kWh; • Natural gas: $0.40/m3 ($0.01/ft3); and • Fuel oil No. 2: $0.41/L ($1.55/gallon).
44 ASHRAE Journal

Montreal’s Louis-H. Lafontaine Hospital reduced energy consumption by 15%, with a projected yearly decrease of 2,387 tons of greenhouse gas emissions. The first 29 months of operation beginning in November 2006 and ending in March 2009 generated a substantial reduction of more than $1.5 million or 20.8 million kWh (74 850 GJ) in energy consumption. The period from March 2009 to March 2010 generated a reduction of $800,000 or 9,335,000 kWh (33 600 GJ), which is closely aligned to the predicted annual savings. This represents a 14.6% reduction of the total energy consumption for the hospital. The energy reduction is mainly achieved using boiler stack heat recovery and geothermal energy to heat domestic hot water. It does not include ventilation and air-conditioning savings because a large portion of the hospital has neither system. Large portions of the hospital were not evaluated due to upcoming renovation projects to address the lack of adequate ventilation. About the Author
Jack Kafesdjian, Eng., is the technical director at EnerCible, a department of SNC-Lavalin’s TIB division in Montreal.

ashrae.org

August 2011



ASHRAE Journal - August 2011

Table of Contents for the Digital Edition of ASHRAE Journal - August 2011

ASHRAE Journal - August 2011
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
2011–12 Presidential Address: Sustaining ASHRAE Through Leadership
Retrocommissioning Older Buildings
Liquid Refrigerant Pumping in Industrial Refrigeration Systems
Technology Award Case Studies:
Hospital Upgrade: Heat Recovery, Geothermal Save Energy
Cool Weather Savings: Using Hybrid Refrigeration Systems for Chiller Retrofit
Special Section
InfoCenter
Standing Columns
Solar NZEB Project
Emerging Technologies
Special Products
IAQ Applications
Washington Report
People
Products
Classified Advertising
Advertisers Index
ASHRAE Journal - August 2011 - Intro
ASHRAE Journal - August 2011 - ASHRAE Journal - August 2011
ASHRAE Journal - August 2011 - Cover2
ASHRAE Journal - August 2011 - 1
ASHRAE Journal - August 2011 - 2
ASHRAE Journal - August 2011 - Contents
ASHRAE Journal - August 2011 - Commentary
ASHRAE Journal - August 2011 - 5
ASHRAE Journal - August 2011 - Industry News
ASHRAE Journal - August 2011 - 7
ASHRAE Journal - August 2011 - 8
ASHRAE Journal - August 2011 - 9
ASHRAE Journal - August 2011 - Letters
ASHRAE Journal - August 2011 - 11
ASHRAE Journal - August 2011 - 12
ASHRAE Journal - August 2011 - 13
ASHRAE Journal - August 2011 - 14
ASHRAE Journal - August 2011 - 15
ASHRAE Journal - August 2011 - Meetings and Shows
ASHRAE Journal - August 2011 - 17
ASHRAE Journal - August 2011 - 2011–12 Presidential Address: Sustaining ASHRAE Through Leadership
ASHRAE Journal - August 2011 - 19
ASHRAE Journal - August 2011 - 20
ASHRAE Journal - August 2011 - 21
ASHRAE Journal - August 2011 - 22
ASHRAE Journal - August 2011 - 23
ASHRAE Journal - August 2011 - 24
ASHRAE Journal - August 2011 - 25
ASHRAE Journal - August 2011 - Retrocommissioning Older Buildings
ASHRAE Journal - August 2011 - 27
ASHRAE Journal - August 2011 - 28
ASHRAE Journal - August 2011 - 29
ASHRAE Journal - August 2011 - 30
ASHRAE Journal - August 2011 - 31
ASHRAE Journal - August 2011 - 32
ASHRAE Journal - August 2011 - 33
ASHRAE Journal - August 2011 - 34
ASHRAE Journal - August 2011 - 35
ASHRAE Journal - August 2011 - Liquid Refrigerant Pumping in Industrial Refrigeration Systems
ASHRAE Journal - August 2011 - 37
ASHRAE Journal - August 2011 - 38
ASHRAE Journal - August 2011 - 39
ASHRAE Journal - August 2011 - 40
ASHRAE Journal - August 2011 - 41
ASHRAE Journal - August 2011 - 42
ASHRAE Journal - August 2011 - 43
ASHRAE Journal - August 2011 - Hospital Upgrade: Heat Recovery, Geothermal Save Energy
ASHRAE Journal - August 2011 - 45
ASHRAE Journal - August 2011 - 46
ASHRAE Journal - August 2011 - 47
ASHRAE Journal - August 2011 - Cool Weather Savings: Using Hybrid Refrigeration Systems for Chiller Retrofit
ASHRAE Journal - August 2011 - 49
ASHRAE Journal - August 2011 - 50
ASHRAE Journal - August 2011 - 51
ASHRAE Journal - August 2011 - InfoCenter
ASHRAE Journal - August 2011 - 53
ASHRAE Journal - August 2011 - 54
ASHRAE Journal - August 2011 - 55
ASHRAE Journal - August 2011 - 56
ASHRAE Journal - August 2011 - 57
ASHRAE Journal - August 2011 - 58
ASHRAE Journal - August 2011 - 59
ASHRAE Journal - August 2011 - 60
ASHRAE Journal - August 2011 - Solar NZEB Project
ASHRAE Journal - August 2011 - 62
ASHRAE Journal - August 2011 - 63
ASHRAE Journal - August 2011 - 64
ASHRAE Journal - August 2011 - 65
ASHRAE Journal - August 2011 - Emerging Technologies
ASHRAE Journal - August 2011 - 67
ASHRAE Journal - August 2011 - 68
ASHRAE Journal - August 2011 - 69
ASHRAE Journal - August 2011 - 70
ASHRAE Journal - August 2011 - 71
ASHRAE Journal - August 2011 - 72
ASHRAE Journal - August 2011 - 73
ASHRAE Journal - August 2011 - 74
ASHRAE Journal - August 2011 - Special Products
ASHRAE Journal - August 2011 - IAQ Applications
ASHRAE Journal - August 2011 - 77
ASHRAE Journal - August 2011 - 78
ASHRAE Journal - August 2011 - 79
ASHRAE Journal - August 2011 - Washington Report
ASHRAE Journal - August 2011 - 81
ASHRAE Journal - August 2011 - People
ASHRAE Journal - August 2011 - 83
ASHRAE Journal - August 2011 - Products
ASHRAE Journal - August 2011 - 85
ASHRAE Journal - August 2011 - Classified Advertising
ASHRAE Journal - August 2011 - 87
ASHRAE Journal - August 2011 - Advertisers Index
ASHRAE Journal - August 2011 - Cover3
ASHRAE Journal - August 2011 - Cover4
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