Page 171 - Boiler plant and distribution system optimization manual

156 Boiler Plant and Distribution System Optimization Manual

Potential Savings Description
Moderate The rule of thumb of each 11 degrees that you
can heat the water going into a boiler will improve
Description efficiency by 1%, applies in this case. In some rare
Infrared heaters have a high combustion applications, make up feedwater is a good candi-
efficiency and an ability to heat selected line of date for solar augmentation. Also, domestic hot
sight areas efficiently, such as hangars, warehous- water heating efficiency can be improved by this
es, gymnasiums and maintenance facilities. They option. There are applications where it can pay
put the heat where it’s needed and do not heat up off such as reducing fuel use with renewable en-
a large volume of air that may uselessly float up ergy for credits towards CO or other air pollu-
2
to the top of a large open building. People below tion compliance reductions
these units are comfortable in their shirtsleeves in
an otherwise cold space. Advantages/Disadvantages
This application would be most unusual,
Advantages/Disadvantages but possible. Financial analysis and air pollution
The infrared heater is usually self contained compliance requirements would be reasons for
and mounts in the overhead, out of the way. They justification.
may be an intelligent replacement to old steam,
hot water and hot air systems.
17. USE FLUE GAS AS A SOURCE OF
CARBON DIOxIDE

15. SUBMERGED COMBUSTION Cost
Moderate
Cost
Moderate

Potential Savings
High

Description
The combustion process takes place un-
der-water with direct contact heat exchange. Typ-
ical use is for heating swimming pools and laun-
dry water (Figure 10.26).

Advantages/Disadvantages
Fuel and air must be pressurized to over-
come submersion. Efficiencies approaching 95%
are possible.

16. SOLAR AUGMENTATION FOR
WATER HEATING

Cost
Moderate

Savings
Moderate Figure 10.50—Submerged combustion burner unit.