The installation and operating of a 100 ton per day glass melting furnace by Flat River Glass Company to make specialty bottles provided an excellent opportunity for recovery of waste heat. The furnace operates at 2300°F, and four feeders to bottle making machines operate at 2100“F. The 120,000 s.f. packaging area is next to the furnace bay, and it is heated solely by reclaimed heat from the melting furnace bay.

There are two systems that are used to transfer this waste heat from the furnace area to the packaging area. The first of these systems is a water loop. Water is circulated above the molten glass feeders and refiner section of the furnace. This hot water is piped out in the packaging area and through six (6) fan coll units. These fan coil units are located down the center of the packaging area. The water also goes through a coil located in the air recovery system. In the summertime the water is circulated around a sand storage silo to preheat incoming sand.

The second system that recovers heat from the melting furnace area is a series of ducts to capture hot air. This ductwork is placed above the crown of the furnace. Also heat reclaim hoods are placed above each feeder and the refiner section of the furnace. Hot air from all of the hoods is drawn through a filter section to clean sand and dust from it. The hot air from the hoods is delivered to the 42" diameter main ductwork by 24" diameter ducts. Each of the 42" diameter ducts are open above the refiner section and molten glass feeders. Additional heat is recovered by this open ductwork. Main 42" diameter ductwork then delivers the recovered hot air to each side of the packaging area. Four 1 h.p. supply air fans are located here and supply plastic tubes with 10,000 cfm each. Distribution of heated air along the sides of the packaging area is done with flexible plastic tubes that have holes in the bottoms of them, so high velocity air is delivered to the packaging area.

This system has worked well during the last winter. Certain adjustments have to be made to the louvers in the building structure during the heating season. Some redesign of ductwork will occur before next winter so that even more heat can be recovered.

Flat River Glass is a good example of how waste process heat can be transferred from one area to another and put to good use.

Meeting Name

5th Annual UMR-DNR Conference on Energy (1978: Oct. 10-12, Rolla, MO)

Document Type

Article - Conference proceedings


Waste Heat Utilization

Document Version

Final Version

File Type





© 1978 University of Missouri--Rolla, All rights reserved.

Publication Date

12 Oct 1978