ASHRAE Journal - April 2015 - 41

TECHNICAL FEATURE

It is possible to add a recirculating warm deck
air-handling unit to an existing VAV air system and
change out the terminals from single duct reheat to
dual duct terminals. This approach is more feasible
if there is space for the warm deck air-handling
unit and the distribution terminals are in an easily
accessible location. Also, careful evaluation of the
existing VAV unit fan capacity turndown should be
investigated.
Consideration must account for the additional space
requirements of the dual duct system in a retrofit situation. Possible solutions may include stacked air handlers
or rooftop equipment.
In the evaluation of replacing the existing operating suite system, credit savings in the hospital
infrastructure capacity to the replacement system.
Considerable savings in boiler and chiller plant
capacity will be achieved and this capacity will be
available for future additions and renovations. The
operating suite needs to be supported by utilities
that are on emergency power and this may relate to

www.info.hotims.com/54427-55

further infrastructure savings.
Also, if the central plant capacity is judged to be
marginal, replacing the operating room system may
be a better solution than increasing the capacity of the
plant.

Conclusions
It has been demonstrated that the energy demands of
an operating room HVAC system can be mitigated by a
dual duct air system, as compared to a well-controlled
conventional VAV two-position system.
The proposed dual duct system has a higher installed
cost, but will provide a favorable payback for many
applications.
The changing of the paradigm of what is the optimum
system to be applied to the operating room is one of the
changes required to address the high energy requirements of the hospital.

References
1. ANSI/ASHRAE/ASHE Standard 170-2008, Ventilation of Health
Care Facilities.

www.info.hotims.com/54427-12
APRI L 2015

ashrae.org

ASHRAE JOURNAL

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ASHRAE Journal - April 2015

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

Contents
ASHRAE Journal - April 2015 - Cover1
ASHRAE Journal - April 2015 - Cover2
ASHRAE Journal - April 2015 - 1
ASHRAE Journal - April 2015 - 2
ASHRAE Journal - April 2015 - Contents
ASHRAE Journal - April 2015 - 4
ASHRAE Journal - April 2015 - 5
ASHRAE Journal - April 2015 - 6
ASHRAE Journal - April 2015 - 7
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ASHRAE Journal - April 2015 - 40
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ASHRAE Journal - April 2015 - Cover3
ASHRAE Journal - April 2015 - Cover4
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