ASHRAE Journal - January 2014 - 43

2013 ASHRAE TECHNOLOGY AWARD CASE STUDIES
through Jan. 2012 with a net annual avoided cost of $1 million.
One additional cost that had to be included was the
cost of running one of the high-pressure steam boilers at
low fire during cogeneration (CHP) mode so that in the
event of cogeneration shutdown we could get the highpressure
steam system operational in under an hour.
That additional annual operation cost was $73,726.
Also, we have added the calculated cost of chilled water
demand load and power consumption savings on the
CUP chilled water production by recovering 24,500 lb/h
(3087 g/s) of high-pressure steam from the cogeneration
heat recovery steam generator for an annual total
of 294,000 lb/h (37043 g/s) of high-pressure steam
(165,541.6 MMBtu). That steam is used to produce 21
million ton hours of cooling via the steam-driven centrifugal
chillers at an estimated savings of $817,523 for a
combined annual net savings of $1.8 million from Feb.
2011 through Jan. 2012. This puts the simple payback at
2.16 years versus four years as initially modeled.
Systems overall heat transfer efficiency for the cogen-
eration (CHP) unit increased from around 30% for generation
of electric power to slightly above 88% by using
the heat recovery steam generator unit to capture
the free waste heat and use it effectively to generate
domestic hot water, heating hot water, sterilizer steam
and/or chilled water in the manifolded high-pressure
steam distribution system.
The environmental impact from NOX emissions has
been reduced by selecting a gas turbine-generator CHP
unit using aqueous ammonia SCR with best available
control technology rated to produce maximum 15 ppm
NOX in lieu of high-pressure steam boilers. Using the
EPA CHP emissions calculator, the CHP system will
reduce NOX by a net reduction of 71% or 20.79 tons/year
(56.9 kg/year), SO2 by a net reduction of 100% or
56.10 tons/year (154 kg/year) and will reduce CO2 by
10,511 tons/year (28,797 kg/year) or 28%.
Expensive hurdles included site adaptation of the exist-
ing 50-year-old CUP roof structural support to install
the equipment on the roof and getting a crane to set up
the equipment without closing the hospital main patient
drop-off. Others were limited working space access adjacent
to the emergency entrance/ambulance drive and the
ongoing construction of the new research building.
www.info.hotims.com/49800-122
JAN UARY 2014 ashrae.org A SHR A E J O U RNA L
43

ASHRAE Journal - January 2014

Table of Contents for the Digital Edition of ASHRAE Journal - January 2014

ASHRAE Journal - January 2014
Contents
Commentary
Industry News
Letters
Meetings and Shows
Effect of Heat Rejection Load and Wet Bulb on Cooling Tower Performance
Shaping the Next... Building and Energy
Texas Hospital Central Plant Redesign
Detecting Faults in Hong Kong High-Rise
Engineer's Notebook
HVAC Applications
Refrigeration Applications
Energy Modeling
The Performance Gap
Data Centers
People
Classified Advertising
Advertisers Index
ASHRAE Journal - January 2014 - B1
ASHRAE Journal - January 2014 - B2
ASHRAE Journal - January 2014 - ASHRAE Journal - January 2014
ASHRAE Journal - January 2014 - Cover2
ASHRAE Journal - January 2014 - 1
ASHRAE Journal - January 2014 - 2
ASHRAE Journal - January 2014 - Contents
ASHRAE Journal - January 2014 - Commentary
ASHRAE Journal - January 2014 - 5
ASHRAE Journal - January 2014 - Industry News
ASHRAE Journal - January 2014 - 7
ASHRAE Journal - January 2014 - 8
ASHRAE Journal - January 2014 - 9
ASHRAE Journal - January 2014 - 10
ASHRAE Journal - January 2014 - 11
ASHRAE Journal - January 2014 - 12
ASHRAE Journal - January 2014 - Letters
ASHRAE Journal - January 2014 - Meetings and Shows
ASHRAE Journal - January 2014 - 15
ASHRAE Journal - January 2014 - Effect of Heat Rejection Load and Wet Bulb on Cooling Tower Performance
ASHRAE Journal - January 2014 - 17
ASHRAE Journal - January 2014 - 18
ASHRAE Journal - January 2014 - 19
ASHRAE Journal - January 2014 - 20
ASHRAE Journal - January 2014 - 21
ASHRAE Journal - January 2014 - 22
ASHRAE Journal - January 2014 - 23
ASHRAE Journal - January 2014 - Shaping the Next... Building and Energy
ASHRAE Journal - January 2014 - 25
ASHRAE Journal - January 2014 - 26
ASHRAE Journal - January 2014 - 27
ASHRAE Journal - January 2014 - 28
ASHRAE Journal - January 2014 - 29
ASHRAE Journal - January 2014 - 30
ASHRAE Journal - January 2014 - 31
ASHRAE Journal - January 2014 - 32
ASHRAE Journal - January 2014 - 33
ASHRAE Journal - January 2014 - 34
ASHRAE Journal - January 2014 - 35
ASHRAE Journal - January 2014 - Texas Hospital Central Plant Redesign
ASHRAE Journal - January 2014 - 37
ASHRAE Journal - January 2014 - 38
ASHRAE Journal - January 2014 - 39
ASHRAE Journal - January 2014 - 40
ASHRAE Journal - January 2014 - 41
ASHRAE Journal - January 2014 - 42
ASHRAE Journal - January 2014 - 43
ASHRAE Journal - January 2014 - 44
ASHRAE Journal - January 2014 - 45
ASHRAE Journal - January 2014 - Detecting Faults in Hong Kong High-Rise
ASHRAE Journal - January 2014 - 47
ASHRAE Journal - January 2014 - 48
ASHRAE Journal - January 2014 - 49
ASHRAE Journal - January 2014 - 50
ASHRAE Journal - January 2014 - 51
ASHRAE Journal - January 2014 - Engineer's Notebook
ASHRAE Journal - January 2014 - 53
ASHRAE Journal - January 2014 - 54
ASHRAE Journal - January 2014 - 55
ASHRAE Journal - January 2014 - 56
ASHRAE Journal - January 2014 - 57
ASHRAE Journal - January 2014 - HVAC Applications
ASHRAE Journal - January 2014 - 59
ASHRAE Journal - January 2014 - 60
ASHRAE Journal - January 2014 - 61
ASHRAE Journal - January 2014 - 62
ASHRAE Journal - January 2014 - 63
ASHRAE Journal - January 2014 - Refrigeration Applications
ASHRAE Journal - January 2014 - Energy Modeling
ASHRAE Journal - January 2014 - 66
ASHRAE Journal - January 2014 - 67
ASHRAE Journal - January 2014 - The Performance Gap
ASHRAE Journal - January 2014 - 69
ASHRAE Journal - January 2014 - 70
ASHRAE Journal - January 2014 - 71
ASHRAE Journal - January 2014 - 72
ASHRAE Journal - January 2014 - 73
ASHRAE Journal - January 2014 - Data Centers
ASHRAE Journal - January 2014 - 75
ASHRAE Journal - January 2014 - 76
ASHRAE Journal - January 2014 - People
ASHRAE Journal - January 2014 - Classified Advertising
ASHRAE Journal - January 2014 - Advertisers Index
ASHRAE Journal - January 2014 - 80
ASHRAE Journal - January 2014 - Cover3
ASHRAE Journal - January 2014 - Cover4
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