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 TABLE IV.4CLIMATE ZONES AND REPRESENTATIVE CITIES
Climate zone
Population
1A
2A
2B
3A
3BCA
3BNon CA
3C
4A
4B
4C
5A
5B
6A
6B
7
8
While a UFHWST can be installed outdoors anywhere in the Nation, for this analysis, DOE is using the assumption that these installations will only occur in the Very Hot and Hot
TMY
location No.
Representative city
6,208,359
38,418,718
6,869,283
43,230,951
29,951,605
5,546,151
8,596,694
69,154,015
2,245,023
9,696,610
70,727,419
13,119,013
17,705,715
2,650,907
2,625,239
170,286
Miami
Houston
Phoenix
Atlanta
Los Angeles
Las Vegas
San Francisco
Baltimore
Albuquerque
Seattle
Chicago
Boulder
Minneapolis
Helena
Duluth
Fairbanks
722020
722430
722780
722190
722950
723677
724940
724060
723650
727930
725300
724699
726580
727720
727450
702610
outdoors, and the monthly average ambient temperature values for each Tamb, z.
regions Building America climate zones 1A, 2A, and 2B where the chance of overnight freezing is very low.
Table IV.5 shows the fraction of UFHWSTs installed indoors versus
TABLE IV.5AVERAGE MONTHLY AMBIENT TEMPERATURES
Average temperature for month F
Location weight 1
1A
2B
2A
Indoor
DOE requests comment on its assumption regarding the typical ambient temperatures for UFHWSTs installed indoors and outdoors.
DOE requests comment on its assumption that 10 percent of all UFHWST would be installed outdoors.
DOE requests information on the typical capacities and R-values of outdoor equipment.
DOE requests comment on its assumption that outdoor installations
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67
55
51
75
3
70
60
55
75
71
63
61
75
4
5
75
75
69
75
6
80
81
75
75
7
82
93
81
75
83
96
83
75
8
82
93
83
75
9
81
87
80
75
10
79
77
69
75
11
74
64
63
75
12
69
53
55
75
would be limited to climate zones 1A, 2A, and 2B. DOE requests information or data on the fraction of installations that occur within these, or other, climate zones.
DOE requests comment on its Tank Thermal Loss Model.
d. R-value of Insulation Ri, j
To calculate the energy used by the boiler attributable to the heat losses of the UFHWSTs, DOE used the following equation for each EL listed in Table IV.1
of this document:
The R-value of each zone i of the UFHWST is defined for each EL j in the engineering analysis in Table IV.1 and Table IV.3 of section IV.B of this document.
EBoi lj Where:
EBoilj = The energy by the boiler required to maintain the water temperature in the UFHWST at the temperature Ti at each EL j, Btu/yr, Qhr, j = hourly heat loss for the UFHWST at each EL j see section IV.C.1, Btu/hr of this document, and
0.012
0.075
0.013
0.900
2
=
Qhr,1.
X
8760
1
X
Boiz er ,yr 11
Boilern = average boiler efficiency % in year yr defined in section IV.F.2 of this document.
Table IV.6 presents the energy used by the boiler attributable to the heat losses of the UFHWST at the baseline EL 0 and each EL by tank capacity.
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2. Annual Energy Use Due to UFHWST
Losses
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Table IV.7 presents the resulting energy savings at each EL above baseline. The representative storage volumes used in this analysis are discussed in section IV.B.2 of this document.
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Climate zone/location z
