Using waste heat to satisfy heat needs reduces the consumption
of fossil fuels burned. To illustrate directly, the use of the heat
produced in the local plant boiler room was reduced by the amount
of heat received fromthe recovery system. The value of the reduced
heat flux can be converted to the classic fuel flux. The calculation
accounts for the average flux of useful energy produced in the form
of hot oil, E_ue ¼ 1269.6 kW. The plastic tape plant that is the object
of this study had its own boiler fired with natural gas. The required
production of thermal hot oil in the boiler room was correspondingly
reduced. The subsequent reduction in the natural gas flux
consumed was 149.4 m3n/h. (Table 6).