ENERGY SAVINGS
Below are some examples and suggestions regarding
energy savings.
1.
The following is a calculation for replacing the conventional light bulbs
in the EXIT signs with the long lasting energy saving bulbs.
Most do not realize how much energy EXIT signs burn because they are
“ON” 24 hours.
·
Existing bulbs: two 15 watt per sign.
Annual energy cost: 2 x 15 watt x
8760 hours x $0.05: 1000 = $13.14
per sign.
Materials cost: approximately $2.00 annually per sign.
·
Retrofitted fixture with two 2-watt bulbs.
Annual energy cost: 2 x 1 w x
8760h x $0.05 : 1000 =
$0.876 per sign.
Materials cost: $25.68 per sign, (that includes PST).
·
Saving in energy consumption is $12.26 annually per sign and with the
extra material cost of $23.68 per sign the payback is less then 2 years!
The proposed LED bulb is guaranteed for 10 years and its life expectancy is 25
years. Added benefits are the
savings in labor cost and/or time. There
is no labor component in the calculations above, as the new bulbs should be
installed as the existing burn out.
2.
The following is a Master List that should allow for quick calculations
regarding retrofit of F40 fluorescent light fixtures with electronic ballasts. Numbers below should be used for budgeting purposes only, as
prices for supply and labor may fluctuate depending on the circumstances.
Also these calculations do not address retrofitting the fixtures by
installing reflectors. Please note that it was assumed that the light fixtures are
“ON” 24 hours, you can always extrapolate for other cases, should it be
required.
·
Existing fluorescent fixture: one CW F40 tube, 120v.
Annual energy cost: 57 watt x 8760 hours x $0.05 : 1000 = $24.97
Retrofitted fixture with an electronic ballast and CW F40/ES tube.
Annual energy cost: 32w x 8760h x
$0.05 : 1000 = $14.02
Savings: $10.95
Materials: $32.00
Labor:
$8.50
$40.50
Payback: $40.50 : $10.95 =
3.7 years
·
Existing fluorescent fixture: two CW F40 tubes, 120 v.
Annual energy cost: 96 watt x 8760 hours x $0.05 : 1000 = $42.05
Retrofitted fixture with an electronic ballast and CW F40/ES tube.
Annual energy cost: 59 x 8760h x
$0.05 : 1000 = $25.84
Savings: $16.21
Materials: $32.00
Labor:
$8.50
$40.50
Payback: $40.50 : $16.21 =
2.5 years
·
Existing fluorescent fixture: one CW F40 tube, 347v.
Annual energy cost: 57 watt x 8760 hours x $0.05 : 1000 = $24.97
Retrofitted fixture with an electronic ballast and CW F40/ES tube.
Annual energy cost: 32w x 8760h x
$0.05 : 1000 = $14.02
Savings: $10.95
Materials: $35.00
Labor:
$8.50
$43.50
Payback: $43.50 : $10.95 = 4
years
·
Existing fluorescent fixture: two CW F40 tubes, 347v.
Annual energy cost: 96 watt x 8760 hours x $0.05 : 1000 = $42.05
Retrofitted fixture with an electronic ballast and CW F40/ES tube.
Annual energy cost: 59 x 8760h x
$0.05 : 1000 = $25.84
Savings: $16.21
Materials: $35.00
Labor:
$8.50
$43.50
Payback: $43.50 : $16.21 =
2.7 years
3.
Commercial properties energy consumption charges include so-called
“Demand”. One of the easy ways
to reduce this charge is to “spread” the start up time of numerous fan
motors and heat pumps in a building. For
instance if a property supply/exhaust system fans are set to start at 6 AM, set
their start individually with one-minute difference.
It goes as well for the heat pumps and other air handlers.
Let
us know should you require help in calculations and/or implementation of
different energy saving methods.