ASHRAE Journal - August 2021 - 61

COLUMN ENGINEER'S NOTEBOOK
TABLE 1 Case Study 1 COP comparison table.
FIGURE 3 Heating-only scenario graph.
CONDITIONS
Heating Only at Design OA of 37°F, HHW Supplied at 115°F
Heating Only at Design OA of 37°F, HHW Supplied at 110°F
Heating Only at Design OA of 37°F, HHW Supplied at 105°F
Heating Only at Design OA of 37°F, HHW Supplied at 100°F
Heating Only at Design OA of 37°F, HHW Supplied at 95°F
Heating Only at Design OA of 37°F, HHW Supplied at 90°F
Simultaneous Heating and Cooling:
HHW Supplied at 115°F,b CHW Supplied at 46°F
Simultaneous Heating and Cooling:
-
HHW Supplied at 110°F,b CHW Supplied at 46°F
Simultaneous Heating and Cooling:
-
HHW Supplied at 105°F,b CHW Supplied at 46°F
Simultaneous Heating and Cooling:
-
HHW Supplied at 100°F,b CHW Supplied at 46°F
Simultaneous Heating and Cooling:
-
HHW Supplied at 95°F,b CHW Supplied at 46°F
Simultaneous Heating and Cooling:
-
HHW Supplied at 90°F,b CHW Supplied at 46°F
Simultaneous Heating and Cooling:
-
HHW Supplied at 90°F,b CHW Supplied at 50°Fc
Heating Only at OA of 65°F,d HHW Supplied at 115°F
Heating Only at OA of 65°F,d HHW Supplied at 110°F
Heating Only at OA of 65°F,d HHW Supplied at 105°F
Heating Only at OA of 65°F,d HHW Supplied at 100°F
Heating Only at OA of 65°F,d HHW Supplied at 95°F
Heating Only at OA of 65°F,d HHW Supplied at 90°F
4.4
4.4
4.4
4.4
4.4
4.4
BASELINE
COP
2.8
2.8
2.8
2.8
2.8
2.8
-
PROPOSEDa
COP
2.0
1.9
1.9
1.9
1.8
1.7
5.8
FIGURE 4 Simultaneous heating and cooling scenario graph.
5.5
5.4
5.0
4.8
4.3
Baseline
Proposed at:
4.5
2.6
2.5
2.5
2.4
2.3
2.1
aProposed COP is based on aggregate performance between domestic
hot water load served by HHW and load served by electric
resistance heat.
bMultiple HHW supply temperature operating points were reviewed
to evaluate potential energy effi ciency gain from resetting
HHW supply temperature.
cMaximum CHW supply temperature operating point reviewed
with minimum HHW supply temperature operating point to evaluate
potential energy effi ciency gain from resetting both HHW and
CHW supply temperatures.
dMild weather condition to evaluate anticipated performance at
intermediate ambient climate conditions.
110°F HHWS, 46°F CHWS
95°F HHWS, 46°F CHWS
90°F HHWS, 46°F CHWS
115°F HHWS, 46°F CHWS
105°F HHWS, 46°F CHWS
100°F HHWS, 46°F CHWS
90°F HHWS, 46°F CHWS
(Figure 3), the load profi le of this project is such that there
is signifi cant simultaneous demand for heating and
cooling within the building, a circumstance in which the
proposed design has signifi cantly higher COP (Figure 4).
Another factor contributing to the small impact on overall
project EUI is the relatively small magnitude of the
domestic hot water energy consumption compared to
other energy loads within the building.
During our COP analysis, it became clear that resetting
the heating hot water temperature produced by the
HVAC heat-recovery chiller had a signifi cant impact on
the aggregate COP of the proposed dual-source domestic
hot water heater design approach. While the HVAC
heat-recovery chiller COP improved signifi cantly with
reduced heating hot water supply temperatures, the
heat transfer done by the heat exchanger served by the
A U G U S T 2 0 2 1 ashrae.org ASHRAE JOURNAL
61
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
30
35
40
45
50
55
60
Outdoor Air Temperature (°F)
65 70°F
6
5
4
3
2
1
30
35
40
45
50
55
Outdoor Air Temperature (°F)
Baseline
Proposed
60
65
70
Coeffi cient of Performance (COP)
Coeffi cient of Performance (COP)
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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
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