ASHRAE Journal - July 2020 - 42

2020

ASHRAE TECHNOLOGY AWARD CASE STUDIES

HWS
HWR
CHWS
CHWR

HP-1

Low Loss Header
AAV
CHWR

CHWR
CHWS

CHWS
HWS
HWR
CHWS
CHWR

Heat Recovery Air
Source Heat Pump Typ.

To/From AHU Cooling
Coils and Fan Coil Units

HP-2

HWR
HWS
AAV

Low Loss Header
HWR

HWS

HWS
Boiler

Boiler

Supplementary Gas
Fired Condensing Boiler Typ.

Boiler

To/From AHU Heating
Coils, Reheat Coils
and Fan Coil Units

Boiler

HWR

HWS
HWR

To/From Radiant Slab
(Heating Only)

M

FIGURE 1 Hot water and chilled water central plant schematic.

building envelope and the use of air-source heat pumps
with heat recovery to generate the building's heating
water needs, as well as air-to-air heat recovery wheels
in air-handling units (AHUs) to recover waste heat and
moisture from the exhaust air.

Building Envelope
Located in a cold-weather climate, with 4,180 heating degree-days below 18°C (64°F) (BC Building Code
2012), the building utilizes a high-performance building
envelope to reduce envelope heat loss, thus reducing the
heating energy consumption and helping to maintain
a stable indoor temperature for the exhibit. The building's envelope includes an R-55 (RSI-9.7) roof, an R-23.3
(RSI-4.1) wall, and triple-glazed windows, compared to
the baseline model with an R-20 (RSI-3.5) roof, an R-15.6
(RSI-2.7) wall, and double-glazed windows.

Hydronic Systems
Heating and cooling in the building are provided by
42

ASHRAE JOURNAL

ashrae.org

J U LY 2 0 2 0

hot water and chilled water, generated by two 175 kW
(50 ton) air-source heat recovery heat pumps, and four
(three duty/one standby) 145 kW (495 MBH) supplemental
gas-ﬁred condensing boilers. Hot water and chilled water
from the heat pumps are connected to separate hot-water
and chilled-water low-loss headers. Boilers are also connected to the hot-water low-loss header. Refer to Figure 1
for the hot-water and chilled-water plant schematic.
The air-source heat recovery heat pumps generate hot
water and chilled water simultaneously, and internally
recover the heat of compression from the compressors to increase the heating COP. When more heating is
required than can be recovered, the heat pumps use the
ambient air as a heat source to increase the heating output. As the heating demand increases in the winter season and the heat pumps cannot keep up with the building heating demand, the supplemental boilers stage
on to inject hot water into the heating loop. The energy
model predicted that the heat pumps could satisfy 76%
of the annual heating demand of the building.

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ASHRAE Journal - July 2020

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

Contents
ASHRAE Journal - July 2020 - Intro
ASHRAE Journal - July 2020 - Cover1
ASHRAE Journal - July 2020 - Cover2
ASHRAE Journal - July 2020 - 1
ASHRAE Journal - July 2020 - Contents
ASHRAE Journal - July 2020 - 3
ASHRAE Journal - July 2020 - 4
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ASHRAE Journal - July 2020 - Cover3
ASHRAE Journal - July 2020 - Cover4
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