Analysis of Electric Energy Usage in Air Force Houses Equipped with Air-to-Air Heat Pumps Page: 12
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occur at the same time, the load factor for the
entire group is low.
b. Daily Pattern of Power Demand
In order to determine how the power demand
varied throughout the day, the daily pattern of
ower demand was plotted for 5 of the sample
ouses for the months of January 1960 and August
1959. For these 2 months, the power used during
each 15-min period of the day was tabulated for
the 5 houses. From these data the maximum and
minimum demands that occurred on any day of
the month and the average demand for all days of
the month were plotted for each 15-min period of
the day. This information is shown in figures 4
to 8, inclusive, for January 1960 and in figures 9
to 13, inclusive, for August 1959.
Of the 5 sample houses evaluated, houses
numbered 14, 263, 468, and 587 revealed similar
changes in the average and maximum power
demands between the day and night hours duringthe month of January. Starting in the morning
at a time ranging from about 0630 to 0900 hr, the
average and maximum power demands rose
quickly to about twice that observed earlier in the
morning and remained at a high level until 1 to 3
hr after noon when they decreased to a value only
a little above the night demand. After about 2
hr at a low value, the power demand rose again
to a smaller maximum at about 1800 or 1900 hr
and then gradually decreased to night level,
before midnight in most cases. The daily pattern
of power demand for these 4 houses indicates the
following conclusions regarding the power demand:
(1) The monthly maximum 15-min power
demand often occurred between the hours of
0630 and 2000 and was caused principally by the
activities of the occupants of the house during
their waking hours.
(2) The monthly maximum 15-min power
demand was not directly caused by the heating
equipment during the coldest hours in the 24-hr
period.TABLE 10. Relation of energy usage and degree-days under cooling conditions for June 1959, Little Rock Air Force Base
Energy consumption Degree-days Energy-usage factor, kw-hr/degree-
days (1,000 ft2)
Contractor's Avg Avg Inside
house number indoor outdoor floor area
Heat Appliance temp temp Hourly Hourly Daily mean Hourly Hourly Daily mean
pum p contribu- values, values, above values, values, above
tion kw-hrA 65 OF base 75 oF base indoor avg 65 OF base 75 OF base indoor avg
2-bedroom houses
kw-hr kw-hr OF OF fj2
14 -------------- 720 354 76 79 390 146 90 891 2.1 5.5 9.0
180 ---------------- 900 489 70 79 390 146 270 891 2.6 6 9 3.7
263.....------------- 900 262 68 79 390 146 330 891 2.6 6 9 3.1
301 --_ 720 470 76 79 390 146 90 891 2.1 5.5 9.0
585 a 420 162 a74 79 390 146 a 150 a 999 1.1 a 2.9 a 2. 8
843 ------------------840 179 73 79 390 146 180 999 2.2 5.8 4.7
Average ..-. 816 351 73 79 390 146 192 912 2.3 6.1 5.9
Coefficient of variation........... -----------------------------------------------------------------------------------0.10 0.11 0.44
3-bedroom houses
4 _ -820 244 75 79 390 146 120 999 2.1 5.6 6. 8
74 ..... ----------------- 820 517 71 79 390 146 240 1,013 2.1 5.5 3.4
163 ... ...---------------- 960 555 73 79 390 146 180 999 2.5 6.6 5.3
172.... .... ---------------- 780 289 73 79 390 146 180 1,013 2.0 5.3 4.3
577... .... ---------------- 660 443 77 79 390 146 60 1,115 1.5 4.1 9.9
587...---------------- 880 424 71 79 390 146 240 1,046 2.2 5.8 3. 5
656 660 562 76 79 390 146 90 1,046 1 1.6 4.3 7. 0
770 . - 900 147 73 79 390 146 180 1,115 2.1 5.5 4.4
Average. 810 398 74 79 390 146 161 1,043 2.0 5.3 5.6
Coefficient of variation... ....... ..------------------------------------------------------------ - - 0. 16 0. 14 0.37
4-bedroom houses
467 , --------------- 1560 1 579 74 79 390 146 150 1,553 2.6 6.9 6.7
468............---------------- 1,560 688 76 79 390 146 90 1,900 2.1 5.6 9.1
Average..... 1,560 634 75 79 390 146 120 1,727 2.4 6.3 7.9
Coefficient of variation...............-----------------------------------------------------------------------------------0.11 0.10 0.15
Average for
15 houses-- 912 413 73 79 390 146 166 1,091 2. 2 5. 7 6.0
Coefficient of variation, 15 houses.---------- ----------------------------------------------------------------0.15 0.14 0.38
a House 585 apparently occupied only part of the time. These data not included in the averages.
12
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Achenbach, Paul R.; Davis, Joseph C. & Smith, William T. Analysis of Electric Energy Usage in Air Force Houses Equipped with Air-to-Air Heat Pumps, report, July 13, 1962; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc13244/m1/18/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.