ASHRAE Journal - June 2019 - 48

2019

ASHRAE TECHNOLOGY AWARD CASE STUDIES

The building is ventilated according to hospital and
clinic ventilation standards (two air changes per hour
for outdoor air and six air changes per hour for ventilation) as per the CSA standard imposed by the tenant (the
provincial government). The rooms are ventilated by fan
coil units selected to ensure four air changes per hour.
The other two air changes per hour are provided by
treated fresh air that is delivered directly to the rooms by
the dedicated outdoor air systems (DOAS); the delivered
air is at room temperature (air-conditioned, dehumidiﬁed and/or heated according to the season).
The main energy-efﬁciency measures are:
* Heat recovery to heat the building envelope and
fresh air and to preheat domestic hot water. The main
sources of heat recovery are mechanical cooling, when
required, toilets and general evacuation, electrical
room, and server room. Other sources are heat rejection
from compressors of walk-in freezers and trash room;
* High-efﬁciency modular rooftop unit with integrated variable speed drive and modulating compressors for
the administrative area;
* On-demand ventilation strategy in the administrative area;
* Control system for ventilation, heating and air-conditioning systems including pumps (centralized control
with remote access).
* Efﬁcient lighting and lighting control in high density areas.
* Variable speed drives on all water circulation
pumps.
* ECM motors in all fan coils and series fan power
mixing boxes (FPMB).
* Intelligent hood control and variable volume ventilation systems for the kitchen and cafeteria.
* Low temperature heating coils.
* Efﬁcient windows (thermally broken, double glazing, low-e and argon ﬁlled).

Indoor Air Quality

Ullivik Health Centre was designed to meet the more
stringent of Standards ANSI/ASHRAE/ASHE 170-2008 and
ASHRAE Standard 62.1-2010. Ventilation air is mainly distributed to occupied spaces by wall grilles in the patient
rooms and ceiling diffusers in the administrative, reception and catering area. Air is supplied at a temperature
between 55°F and 65°F (13°C and 18°C) in cooling mode
and between 75°F and 85°F (24°C and 29°C) in heating

ASHRAE JOURNAL

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J U N E 2 0 19

The Ullivik Health Centre in Dorval, QC, Canada, gives a comfortable place to stay for convalescing patients of nearby hospitals and their families.

mode. To ensure thermal comfort in patient rooms and
perimeter zones on the ground ﬂoor, a trickle heating system using electrical baseboards is installed. The electrical
baseboards are authorized to operate at outside temperatures below 32°F (0°C) (adjustable per zone through DDC)
and are modulated by triacs.
Outdoor air brought to the building is controlled and
metered via DDC. A demand-controlled ventilation strategy was implemented to optimize the treatment of the
administrative area's outdoor air. Outdoor air systems are
equipped with MERV 13 ﬁlters and MERV 8 preﬁlters.
A pressure control loop ensures that the building is
maintained at a slightly positive pressure with respect to
the exterior.
All materials, adhesives, sealants, paints and coatings
used during construction are low-emitting materials.
The Ullivik Health Centre stands out for its level of thermal and acoustic comfort and the quality of its indoor
environments; occupant welfare is enhanced by effective
management of fresh air, heating, cooling and lighting.

Innovation

The energy performance of the concept of centralized
water-based heating and cooling is not a surprise or an
innovation since this concept has existed for a long time
and has been used in many energy-efﬁcient projects.
However, the demonstration of the ﬁnancial viability of
this concept compared to other less expensive concepts,
such as VRF systems, is based on a several innovative
elements such as:
* The creative approach and value engineering
performed on conventional ways of design and installation have reduced the overall cost of installation. For
example, the non-conventional Delta T (15°F) used
in the condensing loop along with the Delta T control

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ASHRAE Journal - June 2019

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