ASHRAE Journal - January 2024 - 48

TECHNICAL FEATURE
TABLE 6 Comparison of annual cost-based COPBSC and ηBSh with annual site
energy and source energy LER values.
LER CALCULATION METHOD
Annual COPBSC and ηBSh
Annual Site Energy LER
Annual Source Energy LER
CS1 BUILDING
Cooling
2.28
1.44
0.72
Heating
0.46
0.59
0.52
CS2 BUILDING
Cooling
2.46
1.99
0.82
Heating
0.043
0.055
0.044
AHUs and very little reheat, the COPBSC is only 2.46.
The current minimum SEER value for a split system air
conditioner in Texas is 14, which corresponds to a COP
of 4.1-far higher than the COPBSC for this building that
uses single-duct VAV AHUs and very little reheat!
Building Heating System Efficiency. The annual ηBSh
is calculated for CS2 in the same manner as for CS1 with
monthly values shown in Figure 4. Since no space heating
is needed in summer, months from May to October have
no heating loads and no ηBSh data. The average annual
ηBSh is 0.043 and the average monthly ηBSh ranges from
0.006 to 0.54. The reason for these low ηBSh values is
related to the low heating loads and the fact that the air
that meets these loads is first cooled to 52°F to 60°F (11°C
to 16°C) before being heated to meet the load.
The minimum flow rate of the AHU means these loads
can often be met with an air temperature only 1°F to
2°F (0.6°C to 1°C) above the room temperature, but the
supply air must be heated 15°F to 23°F (8.3°C to 13°C),
and heat has been supplied by a boiler plant with an
efficiency of 79%. In addition, fans and pumps still need
to work at minimum flows and consume additional
equivalent natural gas for heating. Consequently,
128 MMBtu (135 GJ) of plant natural gas is used to meet
8 MMBtu (8 GJ) of annual heating load. Additional
energy is used to cool the air before it is heated to meet
the heating loads, further lowering ηBSh. Note: while the
ηBSh is very low, the total cost to supply heating in this
202,467 ft2 (18,810 m2) building is still only $1,036/yr.
Comparision of Energy LERs with Cost-Based
Conversions. As noted in the Methodology section, site
energy may be used directly, or all energy forms may be
converted to source energy to compute LERs. Annual
results for the case study buildings are given in terms
A bundle to help you manage the risk
of building occupants and water systems
ASHRAE Guideline 12-2020
Managing the Risk of
Legionellosis Associated
with Building Water Systems
Approved by the ASHRAE Standards Committee on March 26, 2020, and by the ASHRAE Board of Directors on March 30,
2020.
Preparing building water
systems to manage the threat
of legionellosis is critical for
occupant safety.
This Guideline is under continuous maintenance by a Standing Standard Project Committee (SSPC) for which the Standards
Committee has established a documented program for regular publication of addenda or revisions, including procedures for
timely, documented, consensus action on requests for change to any part of the Guideline. Instructions for how to submit a
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The latest edition
ephone 404-636-8
AE
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ASHRAE Journal - January 2024

Table of Contents for the Digital Edition of ASHRAE Journal - January 2024

ASHRAE Journal - January 2024 - Intro
ASHRAE Journal - January 2024 - CT1
ASHRAE Journal - January 2024 - CT2
ASHRAE Journal - January 2024 - Cover1
ASHRAE Journal - January 2024 - Cover2a
ASHRAE Journal - January 2024 - Cover2b
ASHRAE Journal - January 2024 - Cover2c
ASHRAE Journal - January 2024 - 1
ASHRAE Journal - January 2024 - 2
ASHRAE Journal - January 2024 - 3
ASHRAE Journal - January 2024 - 4
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ASHRAE Journal - January 2024 - S1
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ASHRAE Journal - January 2024 - S32a
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ASHRAE Journal - January 2024 - S32d
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ASHRAE Journal - January 2024 - Cover3
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