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Chapter 3 Common Inefficiencies Resulting in Waste Heat Rejection The following chapter briefly describes the major sources of inefficiencies when combustion processes occur. They are ordered with the most relevant first and the less significant source at the end. Above Normal Flue Gas Exhaust Temperature The main source of inefficiency that is discussed in this paper is the amount of wasted energy contained in exhaust gases from different processes. The paper focuses on how to recover this energy and what to do with it once it has been recovered. This is the greatest source of inefficiency for most combustion type heating processes and represents a relatively large amount of wasted energy. Average exhaust temperatures can range anywhere from about 75°F [63] if a highly efficient energy recovery system is implemented to over 3,000°F in certain processes such as a Nickel refining furnace where no energy recovery system is installed [4]. A process containing combustion as an indirect heating source with this type of inefficiency can be caused by many different reasons and due to the nature of the combustion process, the inefficiency cannot be completely eliminated. An exhaust gas temperature that is higher than normal could be due to an increase in demand for heat by the system. Because the heat transfer area of the system is fixed in the heat exchanger and the percentage of available energy which is able to be transferred to the working media does not follow the temperature differences exactly, some of the available energy is not able to transfer from the high temperature gas to the working 11PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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