ASHRAE Journal - June 2014 - 28

Technical FeaTure

For Swedish Issaquah, several iterations of control sequence adjustments
were required during the year after
startup commissioning was complete
and the building was occupied for the
system to achieve optimum results.
It is recommended that a project
pursuing a similar system consider
planning for post occupancy commissioning to make any necessary adjustments for optimal operation.

Heat Recovery Coils in Exhaust Systems
(Used Only When Additional Heat is Required)
Chilled Water Coils in Air-Handling Units

58°F Chilled
Water Return
VFD

Variable Flow
Chilled Water
Pumps

Process Cooling Loads
Chiller Bypass Valve

41.5°F Chilled Water Supply

Results
Trend data from 2013 shows that
93% of heating energy was served
by the heat recovery chiller with an
average heating only COP of 4.0. The
energy use intensity (EUI) for the past
two years has been 112 kBtu/ft2·yr
(353 kWh/m2·yr), and the heat recovery system saves the hospital approximately $120,000/yr. While EUI reductions similar to that seen at Swedish
Issaquah may likely be seen in any
hospital project that has an opportunity to design a similar system,
the economic benefits depend on
the local price of natural gas, electric
rates and demand charge structures.
Careful analysis using local utility
rates to determine project specific
economic benefits is recommended.

48°F Chilled Water Supply

Cooler

530 Ton
300 Ton Heat Recovery Chiller - Variable
Chiller - Dual Compressor Speed Screw
Machine
Screw Machine
(3 Typical)

Condenser
Condenser Heating
Capacity is 4,520 MBH

Pump (Typical)

150°F Boiler Supply
(120°F Under Normal Operation
3,000 MBH Condensing
Boiler (6 Typical)

Variable Flow
Heating
Water Pumps
120°F
Heating
Water
Supply

VFD

Heating Coils in
Air-Handling Units

100°F Heating
Water Return

Heating Coils in Terminal Units

Existing Buildings

Figure 3: Heat recovery system.
Although this article is focused
on new hospital projects, the genhydronic heat recovery system would also be significantly
eral concepts may be applicable
to differing degrees in existing hospitals. If the heating
higher.
water supply temperature in an existing building can be
Conclusion
reset low enough during summer months and moderate
Substantial energy is available within a hospital for heat
conditions for a heat recovery chiller to operate (typically
recovery. In many applications, it may be enough to meet
130°F and maybe higher), then a heat recovery chiller
could potentially meet a significant portion of the heating a majority of building heating demand. A hydronic heat
recovery system using a heat recovery chiller and exhaust
demand. If the existing system is served by constant air
recovery coils offer significant energy savings compared
volume AHUs, the amount of air tempering in the buildto traditional boiler heating systems, and in many areas of
ing would be significantly higher than the example used
the country also offer substantial economic savings.
in this article. Therefore, the potential savings from a
28

ASHRAE JouRnAl

ashrae.org

J u n e 2014



ASHRAE Journal - June 2014

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

Contents
ASHRAE Journal - June 2014 - Cover1
ASHRAE Journal - June 2014 - Cover2
ASHRAE Journal - June 2014 - 1
ASHRAE Journal - June 2014 - 2
ASHRAE Journal - June 2014 - Contents
ASHRAE Journal - June 2014 - 4
ASHRAE Journal - June 2014 - 5
ASHRAE Journal - June 2014 - 6
ASHRAE Journal - June 2014 - 7
ASHRAE Journal - June 2014 - 8
ASHRAE Journal - June 2014 - 9
ASHRAE Journal - June 2014 - 10
ASHRAE Journal - June 2014 - 11
ASHRAE Journal - June 2014 - 12
ASHRAE Journal - June 2014 - 13
ASHRAE Journal - June 2014 - 14
ASHRAE Journal - June 2014 - 15
ASHRAE Journal - June 2014 - 16
ASHRAE Journal - June 2014 - 17
ASHRAE Journal - June 2014 - 18
ASHRAE Journal - June 2014 - 19
ASHRAE Journal - June 2014 - 20
ASHRAE Journal - June 2014 - 21
ASHRAE Journal - June 2014 - 22
ASHRAE Journal - June 2014 - 23
ASHRAE Journal - June 2014 - 24
ASHRAE Journal - June 2014 - 25
ASHRAE Journal - June 2014 - 26
ASHRAE Journal - June 2014 - 27
ASHRAE Journal - June 2014 - 28
ASHRAE Journal - June 2014 - 29
ASHRAE Journal - June 2014 - 30
ASHRAE Journal - June 2014 - 31
ASHRAE Journal - June 2014 - 32
ASHRAE Journal - June 2014 - 33
ASHRAE Journal - June 2014 - 34
ASHRAE Journal - June 2014 - 35
ASHRAE Journal - June 2014 - 36
ASHRAE Journal - June 2014 - 37
ASHRAE Journal - June 2014 - 38
ASHRAE Journal - June 2014 - 39
ASHRAE Journal - June 2014 - 40
ASHRAE Journal - June 2014 - 41
ASHRAE Journal - June 2014 - 42
ASHRAE Journal - June 2014 - 43
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ASHRAE Journal - June 2014 - 49
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ASHRAE Journal - June 2014 - Cover4
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