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Operating Room Lighting Replacement
The operating theaters are the defining load on the air handlers, which dictate the setpoint of the supplied air of the air
handler. If the operators adjust the setpoint of the supplied air to compensate for the drop in load there will be both
electrical and thermal savings; an average of 0.69 kWh and .04 therms/direct kWh of reduction. Tables 3 and 4
illustrate these savings. Petaluma’s results by OR are available in Appendix II, as well as the full calculations &
supporting documentation. Kaiser’s calculations and supporting documentation is available in Appendix I. Note that
the basis of the positive value without a controls change for Kaiser’s OR 6 is that the currently supplied cooling for that
OR is greater than the supplied cooling.
Table 3: Savings Summary
Kaiser Petaluma Valley Hospital
Do Nothing Modify AHU Setpoint Do Nothing Modify AHU Setpoint
Direct Indirect Total Direct Indirect Total Direct Indirect Total Direct Indirect Total
11,67
11,67 11,67
11,67
25,17
kWh 3 0 3 3 0 3 2,421 0 2,421 2,421 22,749 0
Therms 0 -1,248 -1,248 0 -1,248 -1,248 0 343 343 0 139 139
$1,05
$1,05
$2,37
$ 1 -$874 -$874 1 -$874 $177 $218 $276 $492 $218 $2,159 6
PG&E
$3,41
Incentive $584 $0 $584 $584 $0 $584 $121 $275 $396 $121 $3,296 7
*These model are conservative because other areas would also have savings due to less reheat. PG&E does not pay an
incentive for indirect savings.
Table 4: Kaiser Unit Based Energy Savings
OR CFM
No
Control
Change
Therms
Saved
/Year
No
Control
Change
Indirect $
Savings
/Year
Direct
kWh $
Savings
/Year
Direct
kWh
Savings
/Year
Revised
Therms
/Year After
Controls
Modification
Controls
Changed
Indirect
$
Savings
/Year 1
Simple
Payback –
Early
Retirement,
in years
Simple
Payback
–
Incr.
Cost, in
years
1 945 -23.9 -$16.73 $105.75 1,175 24.6 $56.89 124 32.0
2 1,231 -124.1 -$86.85 $44.06 490 40.3 $93.07 297 76.9
3 1,081 -118.7 -$83.10 $79.32 881 16.1 $37.24 165 42.7
4 2,166 -342.8 -$239.99 $105.75 1,175 57.5 $132.85 124 32.0
5 2,140 -149.0 -$104.31 $133.29 1,481 43.1 $99.70 98 25.4
6 1,668 84.5 $59.14 $133.29 1,481 19.7 $45.51 98 25.4
7 1,940 -47.2 -$33.06 $133.29 1,481 33.2 $76.74 98 25.4
8 1,249 -113.7 -$79.57 $53.24 592 36.8 $85.08 246 63.6
9 1,162 -102.4 -$71.69 $79.32 881 20.1 $46.54 165 42.7
10 1,358 -182.0 -$127.38 $66.10 734 76.1 $175.82 198 51.3
11 1,036 -21.8 -$15.28 $53.24 592 56.7 $131.05 246 63.6
12 1,096 -106.7 -$74.66 $63.89 710 56.4 $130.35 205 53.0
Total 17,072 -1,247.8 -$873.49 $1,050 11,673 481 $1,110.84
1
Both thermal and kWh
Salas O’Brien Engineers | expect a difference | Project No. 09104
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