When thermal energy is supplied directly to a process stream with a fired heater, the
most important consideration is the cost of the fuel. However, the efficiency of the
furnace is also important; for example, if the furnace has an 80% thermal efficiency, then
the amount of fuel that is needed is 1.25 times the process heat load. In some cases, an
energy efficiency project can affect the efficiency of a furnace. For example, increasing
feed preheat ahead of a charge furnace may increase the stack gas temperature, which in
turn reduces the furnace efficiency. This change in efficiency should be included in the
evaluation of the energy savings.
When thermal energy is supplied directly to a process stream with a fired heater, themost important consideration is the cost of the fuel. However, the efficiency of thefurnace is also important; for example, if the furnace has an 80% thermal efficiency, thenthe amount of fuel that is needed is 1.25 times the process heat load. In some cases, anenergy efficiency project can affect the efficiency of a furnace. For example, increasingfeed preheat ahead of a charge furnace may increase the stack gas temperature, which inturn reduces the furnace efficiency. This change in efficiency should be included in theevaluation of the energy savings.
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