ASHRAE Journal - July 2021 - 44

TECHNICAL FEATURE
can their importance be underestimated. Constant
monitoring and fine-tuning until the systems finally
achieve the potential savings often takes longer than
anticipated, especially during the present COVID-19
environment.
This project or parts of it can be implemented in facilities
with chillers and simultaneous heating loads. Many
systems can be redesigned to use condenser water for
heating; heat recovery chillers can provide 105°F to
110°F (40.6°C to 43.3°C) hot water efficiently (in lieu of
a boiler). The first step is taking a hard look at how systems
are operating, deciding if setpoints are optimal for
the time of year and determining where energy is being
wasted.
Acknowledgments
The authors wish to thank the following people: Daniel
Driver, Member ASHRAE, Trane Technologies, Portland,
Ore., for assistance modeling chiller performance with
and without variable speed drives; and Malcolm Shuey,
P.E., Member ASHRAE, Fox Engineering Co., Oregon
City, Ore., for assistance modeling cooling tower and
plate/frame heat exchanger performance.
References
1. Cohen, R. 2003. " Energy efficiency for semiconductor
manufacturing facilities. " ASHRAE Journal 45(8):28- 34.
2. State of Oregon, Building Codes Division. 2019. " 2019 Oregon
Zero Energy Ready Commercial Code, " Chap. 5. State of Oregon,
Building Codes Division.
3. PNUCC. 2014. " Carbon Emissions: A Northwest
Perspective. " Pacific Northwest Utilities Conference Committee,
presented at Northwest Power & Conservation Council.
https://tinyurl.com/r956nn2h
Bibliography
Reed, M., W. Robinson, N. Hawes. 2019. " Dedicated heat recovery
virtual chiller provides savings for NASA. " ASHRAE Journal 61(1).
Wang, L., S. Yasuko, S. Bowman, D. Claridge. 2018.
" Commissioning an existing heat recovery chiller system. " ASHRAE
Journal 60(12).
Dubov, I. 2005. " Heat recovery, energy savings for semiconductor
plant. " ASHRAE Journal 47(12): 56-60.
Dubov, I. 2003. " Chilled water plant efficiency. " ASHRAE Journal
45(6):37 -40.
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ASHRAE Journal - July 2021

Table of Contents for the Digital Edition of ASHRAE Journal - July 2021

Contents
ASHRAE Journal - July 2021 - Intro
ASHRAE Journal - July 2021 - Cover1
ASHRAE Journal - July 2021 - Cover2
ASHRAE Journal - July 2021 - 1
ASHRAE Journal - July 2021 - Contents
ASHRAE Journal - July 2021 - 3
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