ASHRAE Journal - August 2021 - 64

COLUMN ENGINEER'S NOTEBOOK
FIGURE 9 Baseline Design Approach. Higher education campus academic building
with dedicated heat pump water heater.
CAMPUS CHWR
FM
T
dP
CAMPUS CHWS
BTU
T
FM
T
dP
BTU
T
HRC HRC
FM
T
dP
BTU
T
VFD
VFD
HPWH
CW
HWR
First Cost
The proposed approach of integrating domestic hot
water production with the heat-recovery chillers yielded
first cost savings of approximately $45,000 through
characteristics similar to those in Case Study 1. In this
case, the first cost savings is roughly proportional to
the size of the domestic hot water application. Because
the domestic hot water load is substantially less for the
higher education academic instruction building in this
case study than for the medical office building in Case
Study 1, the first cost savings is lower. However, the savings
is still significant for this application.
Maintenance
As with C, the proposed design approach reduces the
anticipated maintenance obligations through elimination
of dedicated heat pump components. This benefit
is accentuated by the small size of the heat pump system
specified in the baseline design approach; elimination
of unique equipment maintenance requirements is a
benefit that owners with limited operational staff and
budget can appreciate.
64
ASHRAE JOURNAL ashrae.org A U G UST 2021
Energy Efficiency
For this case study, the energy efficiency of the proposed
design is anticipated to be superior to that of the
baseline because the proposed design will typically be in
heat-recovery mode during normal operation, producing
useful chilled water to back-feed into the campus
chilled water loop when there isn't coincident demand
for chilled water in the building. This yields a better COP
than a typical air-source heat pump water heater under
many operational scenarios (Table 1).
Reduced Mechanical Room Space Requirements
The proposed design approach was able to be packaged
within a relatively compact configuration (Figure 11). This
space savings was made possible by consolidating the
separate air-source heat pump water heater and remote
storage tank of the baseline approach into a single dualsource
tank-type water heater. The design team anticipates
that the proposed design will require approximately
half the space required by the baseline design
CW
HWR
dP
HHWS
DHW
Storage
Tank
VFD
VFD
HHWR
VFD
VFD
dP
dP
BLDG CWS
CAMPUS CHWS
dP
BTU
T
FM
T
BTU
T
HRC HRC
FM
T
BTU
T
VFD
VFD
E
Dual Source
Storage Tank
HHWS
DHW
VFD
VFD
HHWR
VFD
VFD
BLDG CHWR
FIGURE 10 Proposed Design Approach. Higher education academic building DHW
production integrated with HRCs.
CAMPUS CHWR
FM
T
dP
BLDG CHWS
BLDG CHWR
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ASHRAE Journal - August 2021

Table of Contents for the Digital Edition of ASHRAE Journal - August 2021

Contents
ASHRAE Journal - August 2021 - Intro
ASHRAE Journal - August 2021 - Cover1
ASHRAE Journal - August 2021 - Cover2
ASHRAE Journal - August 2021 - 1
ASHRAE Journal - August 2021 - Contents
ASHRAE Journal - August 2021 - 3
ASHRAE Journal - August 2021 - 4
ASHRAE Journal - August 2021 - 5
ASHRAE Journal - August 2021 - 6
ASHRAE Journal - August 2021 - 7
ASHRAE Journal - August 2021 - 8
ASHRAE Journal - August 2021 - 9
ASHRAE Journal - August 2021 - 10
ASHRAE Journal - August 2021 - 11
ASHRAE Journal - August 2021 - 12
ASHRAE Journal - August 2021 - 13
ASHRAE Journal - August 2021 - 14
ASHRAE Journal - August 2021 - 15
ASHRAE Journal - August 2021 - 16
ASHRAE Journal - August 2021 - 17
ASHRAE Journal - August 2021 - 18
ASHRAE Journal - August 2021 - 19
ASHRAE Journal - August 2021 - 20
ASHRAE Journal - August 2021 - 21
ASHRAE Journal - August 2021 - 22
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ASHRAE Journal - August 2021 - Cover3
ASHRAE Journal - August 2021 - Cover4
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