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amount of energy rejected as waste heat can be used to calculate a temperature increase to the atmosphere due to this flow of energy. The average specific heat can be assumed to be 0.24 Btu/lbm-°F based on a reference temperature of 68°F. The total waste heat energy emitted by industry can be found using the study conducted by Lawrence Livermore National Laboratory mentioned earlier to be 4.36 x 1015 Btus/yr . The following simple equation is used to find the increase in temperature which is simply a rearranged form of the simplified first law of thermodynamics. ΔT ΔT Q heat mair Cp,air Q heat mair x Cp, air = increase in overall temperature of the air = amount of energy added to the atmosphere from waste heat = overall mass of air in the atmosphere = average assumed specific heat of air based on 68°F air temperature = where This simple analysis results in an increase in overall temperature of 0.0016°F per year but includes many large assumptions about each of the parameters involved. This simple calculation does however show an order of magnitude analysis on the effects of exhausting high temperature, high energy gas into the atmosphere and puts a separate check on the research presented earlier. 10PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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