Federal Register - June 10, 2021
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Source: Federal Register
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Federal Register / Vol. 86, No. 110 / Thursday, June 10, 2021 / Proposed Rules DOE evaluates the effects of amended standards at the national level by comparing a case without such standards referred to as the no-newstandards case with standards-case projections that characterize the market for each UFHWST class if DOE were to adopt amended standards at the specified energy efficiency levels for that class. As discussed in the subsections that follow, this analysis requires an examination of both the efficiency of the UFHWST, as well as the efficiency of the appliance supplying heated water to that tank.
1. Energy Efficiency Distribution in the No-New-Standards Case DOE received limited information regarding the efficiency range of UFHWSTs distributed in commerce in response to its request for comment in the August 2019 ECS RFI. BWC stated that it is appropriate to assume that for this analysis, all UFHWST have R12.5
insulation i.e., that they meet the minimum R-value of 12.5 currently required by ASHRAE 90.1. BWC, No.
5 at p. 3
To estimate the fraction of equipment sold at or above the current standard, DOE examined the counts and R-values of the records in its Compliance Certification Management System CCMS database.28 DOE found that
there were a minimal number of designs that related to the R-value efficiency levels determined in the engineering analysis, as demonstrated by Table IV.11. However, DOE notes that the data from the CCMS database is a count of models at a given efficiency and not a direct reflection of the number of units shipped at that efficiency level. When weighted as a function of shipments, the data shows that the vast majority of shipment are at baseline, as shown in Table IV.13. Consequently, DOE
tentatively agrees with the statement from BWC and for this analysis assumed that almost all UFHWST across all capacities are at the baseline efficiency level, R12.5.
TABLE IV.12FRACTIONS OF MODEL EFFICIENCY IN CCMS
% of records Representative tank volume gal.
EL 0
baseline
EL 1
EL 2
R12.5
R15.62
R18.75
50
175
375
750
1500
3500
5000
14
21
20
18
21
2
0
2
1
0
0
0
0
0
0
0
0
0
0
0
0
TABLE IV.13FRACTION OF MODEL EFFICIENCIES AS A FUNCTION OF SHIPMENTS
% of records
Representative tank volume gal.
Weight
50
175
375
750
1500
3500
5000
EL 1
EL 2
R12.5
R15.62
R18.75
0.03
0.11
0.23
0.26
0.20
0.16
0.01
3
10
23
26
20
16
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
As stated previously, a potential standard increasing the insulation rating of UFWHST equipment would reduce thermal losses, which would in turn
reduce the energy used by a buildings hot water supply equipment to provide hot water.29 Determining the impact of reduced UFHWST losses on the connected boilers requires an estimate of the boiler efficiency. To estimate the efficiency of boiler systems, DOE used the No-New-Standards Case EL0
efficiency distribution data from the May 2016 CWH ECS NOPR 30 to calculate a single, market-weighted,
average efficiency, which is 84.4 percent in 2016. For years beyond 2016 and future years through 2050, DOE used the AEO 2021 data series Commercial:
Stock Average Efficiency: Water Heating: Natural Gas: Reference case to project the efficiency trend of hot-water supply boilers.31 DOE assumed no increase in boiler efficiency after 2050
i.e., the end date for the AEO 2021
See: https www.regulations.doe.gov/ccms.
While there is a wide range of equipment that building owners can use to produce hot water, for this analysis, DOE assumed that 100 percent of all hot water is produced by a hot water supply boiler.
See section IV.E.1.b of this document for details.
30 Available at: https www.regulations.gov/
document?D=EERE-2014-BT-STD-0042-0016 Last accessed: April 8, 2020.
31 U.S. Energy Information Administration, Annual Energy Outlook 2021, Table 22, Commercial Sector Energy Consumption,
Floorspace, Equipment Efficiency, and Distributed Generation Available at: https www.eia.gov/
outlooks/aeo/data/browser id=32AEO2021&cases=ref2021&sourcekey=0 Last accessed April 23, 2021.
DOE requests comment regarding its applied efficiency distribution that 99
percent of all units sold are currently at baseline R12.5.
2. Hot Water Supply Boiler Efficiency Trend khammond on DSKJM1Z7X2PROD with PROPOSALS
EL 0
baseline
28
29
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