ASHRAE Journal - April 2022 - 17

TECHNICAL FEATURE
Option 5: Two Coils with All Heat Pumps
In this option, all boilers and chillers
are replaced by HPs as shown in Figure 6.
In cold climates when HPs may operate
ineffi ciently, dual-fuel heat pumps
(DF-HP2 and DF-HP4 ) in both loops may
be selected. Another option is to add an
emergency gas-fi red or electric boiler in
Loop 1 and/or in Loop 2. This confi guration
holds the same advantages of Option
4 but with additional benefi ts of installing
fewer cooling and heating resources.
To improve the effi ciencies of the HPs, a
four-pipe heat rejection water loop (now
called Loop 4) instead of a two-pipe confi
guration is recommended.3
Figure 7 shows the Loop 4 piping confi guration, including
two supply pipes; one carries the cold water delivered
to heat pumps in cooling mode, and the other carries
the warm water delivered to heat pumps in heating
mode. It also includes two return pipes; one carries the
HX2
HP1
DF-HP2
HX1
FIGURE 6 Option 5 configuration: two coils with all heat pumps.
VAV Box Reheat
AHU Coil Cl1
Water Loop
(Loop 1)
AHU Coil Cl2
Water Loop
(Loop 2)
HP3
DF-HP4
Cooling Loads
Process Cooling
Chilled Water Loop
(Loop 3)
HP5
cold water from heat pumps in heating mode, and the
other carries the warm water from heat pumps in cooling
mode. Each heat pump can receive or deliver cold or
warm water into any of these pipes using two-position
isolation valves. For instance, if the heat pump operates
in heating mode, the warm supply water valve (in red)
Healthy Air.
Healthy Buildings.
The Ruskin®
AIRFLOW-IQ series of products
helps reduce virus transmission in buildings
by using precision outside air velocity and
temperature data to provide healthier indoor air
quality. The AIRFLOW-IQ also helps satisfy the
requirements and recommendations of ASHRAE
62.1, 90.1 and 189.1, as well as California Title 24
and the International Energy Conservation Code
(IECC) by ensuring the minimum ventilation rate for
each occupied space is being satisfi ed. Combine
the AIRFLOW-IQ with our high-performance
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ruskin.com
A P R I L 2 0 2 2 ashrae.org ASHRAE JOURNAL
17

http://www.ruskin.com http://www.ashrae.org

ASHRAE Journal - April 2022

Table of Contents for the Digital Edition of ASHRAE Journal - April 2022

Contents
ASHRAE Journal - April 2022 - Intro
ASHRAE Journal - April 2022 - Cover1
ASHRAE Journal - April 2022 - Cover2
ASHRAE Journal - April 2022 - 1
ASHRAE Journal - April 2022 - Contents
ASHRAE Journal - April 2022 - 3
ASHRAE Journal - April 2022 - 4
ASHRAE Journal - April 2022 - 5
ASHRAE Journal - April 2022 - 6
ASHRAE Journal - April 2022 - 7
ASHRAE Journal - April 2022 - 8
ASHRAE Journal - April 2022 - 9
ASHRAE Journal - April 2022 - 10
ASHRAE Journal - April 2022 - 11
ASHRAE Journal - April 2022 - 12
ASHRAE Journal - April 2022 - 13
ASHRAE Journal - April 2022 - 14
ASHRAE Journal - April 2022 - 15
ASHRAE Journal - April 2022 - 16
ASHRAE Journal - April 2022 - 17
ASHRAE Journal - April 2022 - 18
ASHRAE Journal - April 2022 - 19
ASHRAE Journal - April 2022 - 20
ASHRAE Journal - April 2022 - 21
ASHRAE Journal - April 2022 - 22
ASHRAE Journal - April 2022 - 23
ASHRAE Journal - April 2022 - 24
ASHRAE Journal - April 2022 - 25
ASHRAE Journal - April 2022 - 26
ASHRAE Journal - April 2022 - 27
ASHRAE Journal - April 2022 - 28
ASHRAE Journal - April 2022 - 29
ASHRAE Journal - April 2022 - 30
ASHRAE Journal - April 2022 - 31
ASHRAE Journal - April 2022 - 32
ASHRAE Journal - April 2022 - 33
ASHRAE Journal - April 2022 - 34
ASHRAE Journal - April 2022 - 35
ASHRAE Journal - April 2022 - 36
ASHRAE Journal - April 2022 - 37
ASHRAE Journal - April 2022 - 38
ASHRAE Journal - April 2022 - 39
ASHRAE Journal - April 2022 - 40
ASHRAE Journal - April 2022 - 41
ASHRAE Journal - April 2022 - 42
ASHRAE Journal - April 2022 - 43
ASHRAE Journal - April 2022 - 44
ASHRAE Journal - April 2022 - 45
ASHRAE Journal - April 2022 - 46
ASHRAE Journal - April 2022 - 47
ASHRAE Journal - April 2022 - 48
ASHRAE Journal - April 2022 - 49
ASHRAE Journal - April 2022 - 50
ASHRAE Journal - April 2022 - 51
ASHRAE Journal - April 2022 - 52
ASHRAE Journal - April 2022 - 53
ASHRAE Journal - April 2022 - 54
ASHRAE Journal - April 2022 - 55
ASHRAE Journal - April 2022 - 56
ASHRAE Journal - April 2022 - 57
ASHRAE Journal - April 2022 - 58
ASHRAE Journal - April 2022 - 59
ASHRAE Journal - April 2022 - 60
ASHRAE Journal - April 2022 - 61
ASHRAE Journal - April 2022 - 62
ASHRAE Journal - April 2022 - 63
ASHRAE Journal - April 2022 - 64
ASHRAE Journal - April 2022 - 65
ASHRAE Journal - April 2022 - 66
ASHRAE Journal - April 2022 - 67
ASHRAE Journal - April 2022 - 68
ASHRAE Journal - April 2022 - 69
ASHRAE Journal - April 2022 - 70
ASHRAE Journal - April 2022 - 71
ASHRAE Journal - April 2022 - 72
ASHRAE Journal - April 2022 - Cover3
ASHRAE Journal - April 2022 - Cover4
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