Demand-controlled Exhaust Systems for Boilers and Water - Enervex
Demand-controlled Exhaust Systems for Boilers and Water - Enervex
Demand-controlled Exhaust Systems for Boilers and Water - Enervex
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Sustainable Advantages<br />
Economical<br />
ENERVEX <strong>Dem<strong>and</strong></strong>-Controlled<br />
Fan Cost Venting Material Space Cost Fan Operating Cost<br />
17,000 47,000 23,000 4,000<br />
Combined chimney w/o fan<br />
Venting Material Space Cost Cost of efficiency loss<br />
ECONOMICAL 68,000 40,000 75,000<br />
Multiple 250HP boilers - 4,000 hours/year - $1.20/Therm<br />
Life Cycle Cost (LLC) - 15 years, $1.20/Therm<br />
Multiple <strong>Boilers</strong> with EXHAUSTO<br />
415,000 Therms = $499,200 per boiler<br />
Over a 15year period a typical dem<strong>and</strong><strong>controlled</strong><br />
Multiple boilers exhaust using common system stackserving<br />
4 highefficiency<br />
434,000 Therms boilers = $520,800 in a per 20story boiler building costs<br />
50% less to operate than a combined system<br />
ENERGY without SAVINGS dem<strong>and</strong>control. Most of these<br />
savings are energy savings due to boiler ef<br />
Multiple 250HP boilers - 4,000 hours/year - $1.20/Therm<br />
ficiency improvements. And savings can be<br />
further enhanced by adding an Economizer.<br />
Multiple <strong>Boilers</strong> with EXHAUSTO<br />
415,000 Therms = $499,200 per boiler<br />
Material <strong>and</strong><br />
Labor Savings<br />
Multiple boilers using common stack<br />
434,000 Therms = $520,800 per boiler<br />
MATERIAL AND LABOR<br />
Venting of 4 high-efficiency boilers in 20-story building<br />
Combined sidewall<br />
venting with ENERVEX<br />
Combined Venting with ENERVEX<br />
Combined Venting<br />
$27,500<br />
$68,000<br />
Individual Venting $87,000<br />
ECONOMICAL<br />
$72,000<br />
Combining chimneys <strong>and</strong> reducing dia meters<br />
Life Cycle Cost (LLC) - 15 years, $1.20/Therm<br />
can save material <strong>and</strong> labor when using a<br />
mechanical draft system. Smaller chimneys<br />
are less expensive to install. Side wall exhaust<br />
can save even more material <strong>and</strong> labor.<br />
Fan Cost Venting Material Space Cost Fan Operating Cost<br />
17,000 47,000 23,000 4,000 EXHAUSTO <strong>Dem<strong>and</strong></strong>-Controlled<br />
Venting Material Space Cost Cost of efficiency loss<br />
68,000 40,000 75,000<br />
Energy Savings<br />
Multiple boilers using a common chimney<br />
operate at higher O 2 levels than when<br />
exhausted by individual chimneys.<br />
A mechanical draft system provides more<br />
precise draft control so the O 2 levels can<br />
be lowered. Annual savings can amount to<br />
24% <strong>and</strong> thous<strong>and</strong>s of Dollars. Adding an<br />
economizer will improve energy savings by<br />
up to 5%.<br />
1.0<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
$ Fuel Cost<br />
Multiple 250HP boilers<br />
4000<br />
Common stack<br />
ENERVEX<br />
ENERVEX with Economizer<br />
Unmatched<br />
Per<strong>for</strong>mance<br />
Pressure (inWC) ENERVEX Other<br />
20 40 60 80 100 120 140 160 180 200 220 240 260 280<br />
Seconds<br />
Not only is the ENERVEX system<br />
fast in response to dem<strong>and</strong> changes,<br />
it’s also able to maintain a +/2% accuracy<br />
from setpoint. Alternative solutions using<br />
a VFD <strong>and</strong> a pressure sensor only achieve a<br />
+/ 20% accuracy, so their savings are over<br />
20% less than that of an ENERVEX system.<br />
Combined chimney w/o fan<br />
4<br />
$ 1.20 / Therm<br />
52,020<br />
per boiler<br />
49,920<br />
per boiler<br />
46,500<br />
per boiler<br />
Hours/Year
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