ASHRAE Journal - August 2023 - 36

TECHNICAL FEATURE
TABLE 2 Sample hotel evaluation of three alternate packages.
PROJECT: HOTEL EXAMPLE
Climate Zone: 4C
Required Energy Credits: 50
H03
H07
W02
W03
W06
W08
L02
L03
L06
R01
Q01
Q03
G06
A:
B:
C:
Cooling Efficiency
Guideline 36 Sequence
Heat Pump SW Heater
Efficient Gas SW Heater
Thermostatic Balancing Valves
SHW Distribution Sizing
Lighting Dim & Tuning
Added Occupancy Sensors
Lighting Power Reduction
Renewable Energy
Efficient Elevators
Fault Detection
SHW Storage
Raw Sum of All Credits Achieved
Renewable (R) + Load Management (G)
Renewable + Load Management Limit: 60% × Required
Total Credits Achieved (A - B) + {lesser of B, C}
* Reduced heating loads with improved heating
efficiency (only used for cold climates).
Sample Package Evaluation
To demonstrate how projects might meet the energy
credit requirement, an example is completed for hotels
in Climate Zone 4C. This selection is made because this
combination has a higher required-to-available point
ratio for the moderate climate. Only measures used in
the example are shown in Table 2. In the table, three
alternative credit packages are shown that each meet the
50-credit requirement.
When looking at a particular building, sample packages
can be reviewed by building type and general climate
in the " Application Guide. " 3
Conclusion
A new Section 11 has been added to Standard 90.1 to
increase energy savings by requiring energy credit measures
beyond the base prescriptive requirements. This
new requirement targets a 5% reduction in overall building
energy cost through selection from a broad range
of measures. Allowing designers to choose measures
36
ASHRAE JOURNAL ashrae.o rg
A U G UST 2023
Pack A
3
2
13
10
1
9
2
5
3
10
4
2
31
Yes
31
51
31
30
50
30% Load
70% Load,
0.6 Adj.
Yes
13
6
1
Low Flow
Common
Auto Off
9
2
5
10%
In DDC
Yes
Pack B
2
31
51
31
30
50
0.3 W/ft2 PV
All Class A
In DDC
6
30
4
2
Pack C
51
30
30
51
that are particularly suited to a particular project provides
flexibility in increasing energy savings. There are
resources available to help designers implement this
new requirement in Standard 90.1-2022, including an
" Application Guide. " 3
References
1. ANSI/ASHRAE/IES Standard 90.1-2022, Energy Standard for Sites
and Buildings Except Low-Rise Residential Buildings.
2. Hart, R., J. McNeill, M. Tillou, E. Franconi, et al. 2022. " 90.1
Energy Credits Analysis Documentation. " PNNL-32516. Pacific
Northwest National Laboratory for U.S. Department of Energy,
Office of Energy Efficiency and Renewable Energy. https://tinyurl.
com/52wha9d2
3. Hart, R., M. Tillou, D. Maddox, M. Rosenberg. 2023. " Energy
Credits Application Guide: ASHRAE Standard 90.1-2022. " PNNL34217.
Pacific Northwest National Laboratory for U.S. Department of
Energy, Office of Energy Efficiency and Renewable Energy. https://
tinyurl.com/3zwffmuh
4. ICC. 2021. " 2021 International Energy Conservation Code
(IECC). " International Code Council. https://tinyurl.com/j8j3jtwb
5. McBride, M. 1995. " Development of Economic Scalar Ratios for
ASHRAE Standard 90.1R. " Proceedings of Thermal Performance of the
Exterior Envelopes of Buildings VI 663-677.
6. 6 42 USC 6833. Energy Conservation and Policy Act, Public Law
94-385, as amended. http://www.gpo.gov/fdsys/pkg/USCODE-2011title42/pdf/USCODE-2011-title42-chap81-subchapII.pdf.
Also see
https://www.energycodes.gov/about/statutory-requirements.
15%/5%
In DDC
2
9
TABLE POINTS
FROM STANDARD
90.1
Pack A - SHW
Notes & Adj.
Credits
ALTERNATIVE PACKAGES FOR PROJECT
Pack B - Control/Des
Notes & Adj.
Credits
Pack C: Mix
Notes & Adj
Credits

https://tinyurl.com/52wha9d2 https://tinyurl.com/52wha9d2 https://tinyurl.com/3zwffmuh https://tinyurl.com/3zwffmuh https://tinyurl.com/j8j3jtwb http://www.gpo.gov/fdsys/pkg/USCODE-2011-title42/pdf/USCODE-2011-title42-chap81-subchapII.pdf http://www.gpo.gov/fdsys/pkg/USCODE-2011-title42/pdf/USCODE-2011-title42-chap81-subchapII.pdf https://www.energycodes.gov/statutory-requirements https://ashrae.org/

ASHRAE Journal - August 2023

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