STUDY OF LOW-GRADE WASTE HEAT RECOVERY

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TUDY OF LOW-GRADE WASTE HEAT RECOVERY ( tudy-low-grade-waste-heat-recovery )

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the value can be determined from there. However as a note of caution, most permanent O2 sensors are made from zirconia and measure O2 content on a wet basis, whereas most handheld combustion analyzers measure O2 content on a dry basis and a different set of data should be used other than the type shown above. It should also be noted that excess air losses are confounded with the previous section of inefficiencies, Above Normal Flue Gas Exhaust Temperature. As the temperature of the exhaust gas decreases, so will the losses due to excess O2 content in the stack gas. This relationship is shown in the previous figure. Also when the amount of excess air in the system is decreased, the volumetric flow of the exhaust gas will also decrease, affecting the amount of energy that can be recovered by a heat exchanger. Shell Losses Another, but much less significant, major loss in a combustion heating system is the radiation and convective heat transfer losses from exposed hot surfaces on the equipment or distribution system, if they exist. This is generally only a major source of loss if the equipment has been shut down for an extended period of time and is turned on, requiring the equipment itself to be raised to the operating temperature from the ambient temperature. Overall this loss will account for less than 1% of the fuel energy input but can be easily reduced by the addition of insulation to the exposed hot surfaces [26]. 14

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