How to Determine Fuel Savings
from an E-Tech Economizer
Fuel |
Heating
Value |
Price |
$/MMBTU |
Natural Gas |
1000 BUT/MCF |
$2.5/MCF |
$2.50 |
No. 2 Fuel Oil |
125,000 BTU/gal |
$0.90/gal |
$6.80 |
No. 6 Fuel Oil |
147,000 BTU/gal |
$0.75/gal |
$5.00 |
Coal |
11,000 BTU/ton |
$20/ton |
$0.90 |
To Calculate Fuel Savings:
($/MMBTU of Fuel) x (Average Economizer Heat
Recovery) x (Operation Hours per Year)
(Boiler Efficiency without Economizer) x (1,000,000)
To Calculate Payback (in years):
(Cost of Economizer) + (Cost of Installation) -
(Tax Credit)
(Annual Savings)
Example:
| Fuel: |
Natural Gas |
| Economizer Heat Recovery: |
3,500,000 BTU/hr |
| Operation Hours per Year: |
8,000 |
| Boiler Efficiency: |
79% |
| Cost of Economizer: |
$15,750.00 |
| Cost of Installation: |
$15,000.00 |
| Tax Credit: |
$1,500.00 |
Fuel Savings:
($2.50/MMBTU) x (3,500,000 BTU/hr) x (8,000 hrs) =
$88,608 per year
(.79) x (1,000,000)
Payback:
($15,750) + ($15,000) - ($1,500) =
0.33 Approximately 4 Months
($88,608)
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