Page 192 - Boiler plant and distribution system optimization manual
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Over 100 Ways to Improve Efficiency 177
Section 10-9 4. MODIFY THE FURNACE SYSTEM OR USE
A SEPARATE HEATING SYSTEM TO
Process Heating Systems RECOVER FURNACE ExHAUST GAS
HEAT. [REGENERATIVE HEAT RECOVERY]
CHECkLIST 9
Find a place to invest the heat lost from the
Process Heating Systems
process like preheating the next batch. Recover
1. Minimize air leakage into the furnace by part of the furnace exhaust heat for use in low-
sealing openings er-temperature processes.
2. Maintain proper, slightly positive furnace
pressure
3. Reduce weight of or eliminate material han-
dling fixtures [reduce thermal mass] Section 10-10
Building HVAC Projects
4. Modify the furnace system or use a separate
heating system to recover furnace exhaust
gas heat. [regenerative heat recovery]
CHECkLIST 10
5. Other Check Lists apply to process heating. Building HvAC Projects
1. Use heat pumps
1. MINIMIzE AIR LEAKAGE INTO THE 2. Condensing furnaces, water heaters &
FURNACE BY SEALING OPENINGS boilers
3. Install temperature setback to operate in
One of your best tools for identifying heat
off hours.
losses are infra red scanning instruments which
4. Close shipping/hangar doors when not in
will identify hot spots that need fixing. High en-
use.
ergy losses are produced by high temperature lo-
cations. 5. Reduce make-up air, increase re-circulated
air.
6. Convert steam air make-up units to natu-
2. MAINTAIN PROPER, SLIGHTLY ral gas.
POSITIVE FURNACE PRESSURE 7. Reduce infiltration air.
8. Shut-down exhaust fans during off pro-
You don’t want to be drawing in cold outside
duction periods
air that is heated up then exhausted from the pro-
cess as wasted heat. 9. Install heat recovery ventilators.
10. Install run around heat recovery units be-
tween exhaust and intakes
3. REDUCE WEIGHT OF OR ELIMINATE
MATERIAL HANDLING FIxTURES
[REDUCE THERMAL MASS] 1. USE HEAT PUMPS WITH SOURCE HEAT
FROM WASTE ENERGY OR STEAM
Invest heat into your product not into heat- FROM BOILER PLANT
ing and cooling of massive support equipment.
Use soft ceramic furnace liners instead of fire Savings
brick. Keep the massive weights down. Some of the highest savings possible
