There are at least two ways to describe a furnace’s thermal performance. The percent-available heat indicates thermal efficiency, while the adiabatic flame temperature indicates heat-transfer intensity. Both factors can be used to indicate a furnace’s productivity.
the efficiency of a heating process depends on knowing (or calculating) the
heat of combustion of a fuel. In some cases, it’s sufficient to
use an approximate value, such as 1,000 BTU/ft3
for natural gas.
Efficient process heating
requires recovery of the largest possible fraction of a fuel’s combustion heat
into the material being processed. There are many avenues of loss in the
operation of a heating process. Typically, the dominant loss is energy leaving
with the offgas.
The September 2017 issue of Industrial Heating features our cover story on vacuum diffusion bonding for joining titanium alloys, along with best welding practices for heat-resistant alloys, and much more.