ASHRAE Journal - May 2013 - 52

2013 Technology Award Case Studies
to DX based, as well as variable fan speed control based on
space dew point. The natatorium unit uses information from
the building automation system to compare the outside temperature and the indoor dew point to determine the likelihood
that condensation may occur at the envelope perimeter. When
the likelihood is low, the system reduces the circulating fan
speed to save energy. This is particularly useful during unoccupied periods when a pool cover is in place, and the evaporation load is much less than the maximum design amount.
Natatorium units typically have fans running at 100% continuously to maintain humidity conditions. The natatorium unit
also has air-to-air sensible heat recovery, as well as water-side
condenser heat recovery.

Retail/Water-Source Heat Pump Loop
The ground floor contains mostly retail and restaurant tenants. These zones are served by a water source heat pump system. The groundwater loop provides cooling for the condenser
water loop, and the heating water loop provides heating when
needed. Two 15 ton (53 kW) water source heat pumps provide
cooling for the utility transformer vault. This allows waste
heat to be rejected to the condenser water loop, and used by
the rest of the system. Additionally, the condenser water loop
is tied to the pool loop by a plate heat exchanger and control
valve. This allows waste heat from the condenser water loop
to heat the pool.

Archives
The ASRC is also home to the City of Portland archives.
Four spaces associated with the archives must be kept at specific environmental conditions to help preserve sensitive archived materials.
Two separate storage areas, totaling nearly 20,000 ft2 (1858
2), must be kept at 63°F (17°C) DB and 40% RH year-round.
m
With such a low required dew point (38°F [3°C]), refrigerant-based DX systems can be problematic. To meet this low
dew point, the design team specified two dedicated desiccantbased dehumidification air handlers. Each air handler consists
of three air filter sections (MERV-8, 11, and 15), a desiccant
dehumidification section with electric heat regeneration, DX
cooling, supply fan, electric heat, and humidifier. For redundancy, the two air handlers have the supply and return ductwork tied together and are isolated with motorized dampers. If
one unit is out of commission, it can be isolated, and the other
unit will pick up the load.
The archives office space is required to be kept continuously
at 70°F (21°C) DB and 45% RH (47°F [8°C] dew point). To
accommodate the many different thermal zones of the office
space, a stand-alone variable air volume system was designed
for temperature regulation. To dehumidify the zones, dry air
from one of the archives storage air handlers is diverted to the
variable air volume system as needed.
Near the entry to the archives office on the fifth floor is
a small display case. This case must be kept at the same
conditions as the main archive storage areas (63°F [17°C]
52

ASHRAE Journal

Innovative Features
•	 Direct ground water cooling.
•	 Increased duct system sizing.
•	 Waste heat from utility electrical transformers delivered to condenser water loop.
•	 Variable speed dew-point fan control on natatorium
dehumidification unit.
•	 Pool water pre-heat from condenser water loop.
•	 High-efficiency variable-primary flow heating plant.
•	 Electricity generated by exercise equipment. The
exercise equipment contains small generators, which
feed electricity to the building (in addition to a rooftop PV system). Although the electricity generated
is negligible compared to the overall building energy
use, it teaches building occupants how much effort is
involved in generating a single kilowatt.

DB/40% RH). After much searching for packaged equipment to fit the need, it was realized that a custom system
was required. To maintain these conditions, humidity control
was accomplished using dehumidified air from the fifth floor
archives storage room, ducted through a small chilled water
fan coil, to the display case, and then returned to the storage room by a transfer fan. The fan coil, which handles the
sensible envelope and lighting loads of the display case, is
provided with chilled water by a small electric water cooler,
pump, and buffer tank.
To help reduce envelope-related humidity loads in the archives areas, a vapor barrier was provided in the wall assemblies, and all the zones were blower door tested to find and seal
envelope leaks. To help reduce duct leakage-related humidity
loads, the air handler ductwork was sealed and pressure tested
to SMACNA leakage class 24 requirements.

Energy Efficiency
The ASRC went through extensive energy modeling and
review as required by LEED, as well as the Oregon Department of Energy’s (ODOE) State Energy Efficient Design
(SEED) program. The SEED program directs state agencies
to work with the Oregon Department of Energy to ensure
cost-effective energy conservation measures are included in
new and renovated publicly funded buildings. The energy
modeling was based on ASHRAE/IESNA Standard 90.12004, and used eQUEST version 3.64 for the energy modeling software. The baseline, proposed, and measured EUI
values are as follows:
• Modeled Standard 90.1-2004 baseline EUI: 138 kBtu/
ft2·yr (1 567 266 kJ/m2·yr);
• Modeled proposed EUI: 78 kBtu/ft2·yr (885 846 kJ/
2·yr); and
m
• Actual measured EUI: 64 kBtu/ft2·yr (726 848 kJ/m2·yr).
ashrae.org

May 2013



ASHRAE Journal - May 2013

Table of Contents for the Digital Edition of ASHRAE Journal - May 2013

ASHRAE Journal - May 2013
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
VAV Reheat Versus Active Chilled Beams & DOAS
A Stable Whole Building Performance Method for Standard 90.1
Technology Award Case Studies:
PSU Design Build Project
Passive Cooling for School
Standing Columns
Building Sciences
InfoCenter
Refrigeration Applications
IAQ Applications
Engineer's Notebook
Products
Data Centers
Emerging Technologies
Classified Advertising
Advertisers Index
ASHRAE Journal - May 2013 - ASHRAE Journal - May 2013
ASHRAE Journal - May 2013 - Cover2
ASHRAE Journal - May 2013 - 1
ASHRAE Journal - May 2013 - 2
ASHRAE Journal - May 2013 - Contents
ASHRAE Journal - May 2013 - Commentary
ASHRAE Journal - May 2013 - 5
ASHRAE Journal - May 2013 - Industry News
ASHRAE Journal - May 2013 - 7
ASHRAE Journal - May 2013 - 8
ASHRAE Journal - May 2013 - 9
ASHRAE Journal - May 2013 - 10
ASHRAE Journal - May 2013 - 11
ASHRAE Journal - May 2013 - 12
ASHRAE Journal - May 2013 - 13
ASHRAE Journal - May 2013 - Letters
ASHRAE Journal - May 2013 - 15
ASHRAE Journal - May 2013 - Meetings and Shows
ASHRAE Journal - May 2013 - 17
ASHRAE Journal - May 2013 - VAV Reheat Versus Active Chilled Beams & DOAS
ASHRAE Journal - May 2013 - 19
ASHRAE Journal - May 2013 - 20
ASHRAE Journal - May 2013 - 21
ASHRAE Journal - May 2013 - 22
ASHRAE Journal - May 2013 - 23
ASHRAE Journal - May 2013 - 24
ASHRAE Journal - May 2013 - 25
ASHRAE Journal - May 2013 - 26
ASHRAE Journal - May 2013 - 27
ASHRAE Journal - May 2013 - 28
ASHRAE Journal - May 2013 - 29
ASHRAE Journal - May 2013 - 30
ASHRAE Journal - May 2013 - 31
ASHRAE Journal - May 2013 - 32
ASHRAE Journal - May 2013 - A Stable Whole Building Performance Method for Standard 90.1
ASHRAE Journal - May 2013 - 34
ASHRAE Journal - May 2013 - 35
ASHRAE Journal - May 2013 - 36
ASHRAE Journal - May 2013 - 37
ASHRAE Journal - May 2013 - 38
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ASHRAE Journal - May 2013 - 41
ASHRAE Journal - May 2013 - 42
ASHRAE Journal - May 2013 - 43
ASHRAE Journal - May 2013 - 44
ASHRAE Journal - May 2013 - 45
ASHRAE Journal - May 2013 - PSU Design Build Project
ASHRAE Journal - May 2013 - 47
ASHRAE Journal - May 2013 - 48
ASHRAE Journal - May 2013 - 49
ASHRAE Journal - May 2013 - 50
ASHRAE Journal - May 2013 - 51
ASHRAE Journal - May 2013 - 52
ASHRAE Journal - May 2013 - 53
ASHRAE Journal - May 2013 - Passive Cooling for School
ASHRAE Journal - May 2013 - 55
ASHRAE Journal - May 2013 - 56
ASHRAE Journal - May 2013 - 57
ASHRAE Journal - May 2013 - 58
ASHRAE Journal - May 2013 - 59
ASHRAE Journal - May 2013 - 60
ASHRAE Journal - May 2013 - 61
ASHRAE Journal - May 2013 - Building Sciences
ASHRAE Journal - May 2013 - 63
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ASHRAE Journal - May 2013 - 65
ASHRAE Journal - May 2013 - 66
ASHRAE Journal - May 2013 - 67
ASHRAE Journal - May 2013 - 68
ASHRAE Journal - May 2013 - 69
ASHRAE Journal - May 2013 - InfoCenter
ASHRAE Journal - May 2013 - 71
ASHRAE Journal - May 2013 - 72
ASHRAE Journal - May 2013 - 73
ASHRAE Journal - May 2013 - 74
ASHRAE Journal - May 2013 - Refrigeration Applications
ASHRAE Journal - May 2013 - 76
ASHRAE Journal - May 2013 - 77
ASHRAE Journal - May 2013 - IAQ Applications
ASHRAE Journal - May 2013 - 79
ASHRAE Journal - May 2013 - 80
ASHRAE Journal - May 2013 - 81
ASHRAE Journal - May 2013 - 82
ASHRAE Journal - May 2013 - 83
ASHRAE Journal - May 2013 - Engineer's Notebook
ASHRAE Journal - May 2013 - 85
ASHRAE Journal - May 2013 - Products
ASHRAE Journal - May 2013 - 87
ASHRAE Journal - May 2013 - Data Centers
ASHRAE Journal - May 2013 - 89
ASHRAE Journal - May 2013 - 90
ASHRAE Journal - May 2013 - 91
ASHRAE Journal - May 2013 - Emerging Technologies
ASHRAE Journal - May 2013 - 93
ASHRAE Journal - May 2013 - 94
ASHRAE Journal - May 2013 - Classified Advertising
ASHRAE Journal - May 2013 - Advertisers Index
ASHRAE Journal - May 2013 - Cover3
ASHRAE Journal - May 2013 - Cover4
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