ASHRAE Journal - April 2020 - 75

COLUMN ENGINEERS NOTEBOOK

negligible pressure differential available from the campus
distribution system at the building connection resulted
in very little campus chilled water being supplied to the
building and the majority of the building chilled water
return being circulated back as supply to the building.
The chilled water testing and balancing activities at the
adjacent building exacerbated the effect of low campus
differential pressure at the building point of connection,
but was not the underlying root cause of the issue.
The solution recommended by the author and implemented by the owner was to physically remove the
campus chilled water connection decoupler line and
reconfigure the building campus chilled water connection to a "boosted secondary" pumping arrangement.
Figure 13 (Page 74) shows the resulting building performance after this modification was made.

Conclusions
Careful consideration should be given to the design of
campus chilled water building connections to achieve
optimum performance at a campus utility level as well

as within each building. Design decisions can significantly impact the performance and resilience of the
campus chilled water utility infrastructure.
"Lazy river" campus plant pumping schemes and
direct-coupled building connections with boostedsecondary pumps tend to promote the lowest campus
pumping energy, highest ∆T and greater operational
flexibility and resiliency.

References
1. Peterson, K. 2014. "Improving performance of large chilled
water plants." ASHRAE Journal (1).
2. Taylor, S. 2011. "Optimizing design & control of chilled water
plants part 1: chilled water distribution system selection." ASHRAE
Journal (7).
3. Taylor, S. 2006. "Chilled water plant retrofit-a case study."
ASHRAE Transactions 112(2).
4. Taylor, S. 2002. "Degrading chilled water plant delta-T: causes
and mitigation." ASHRAE Transactions 108(1).
5. Taylor, S. 2015. "Resetting setpoints using
trim & respond logic." ASHRAE Journal (11).
6. Taylor, S. 2011. "Optimizing design &
control of chilled water plants part 3: pipe sizing https://bit.ly/2T2iToK
Rate This Column
and optimizing ∆T." ASHRAE Journal (12).

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A M E R I C A N

APRI L 2020

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M A D E

ASHRAE JOURNAL

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ASHRAE Journal - April 2020

Table of Contents for the Digital Edition of ASHRAE Journal - April 2020

Contents
ASHRAE Journal - April 2020 - Intro
ASHRAE Journal - April 2020 - Cover1
ASHRAE Journal - April 2020 - Cover2
ASHRAE Journal - April 2020 - 1
ASHRAE Journal - April 2020 - Contents
ASHRAE Journal - April 2020 - 3
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ASHRAE Journal - April 2020 - Cover3
ASHRAE Journal - April 2020 - Cover4
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