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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Chapter 6 Example System Design The following chapter describes an example system created and the design steps required. The first step in designing a heat recovery system is to determine the amount of energy that is available in the exhaust stream which can be recovered. This can be accomplished using a simple first law of thermodynamic analysis on the flow of exhaust gas using reasonable temperature drops through the heat exchanger types used. Once the amount of energy available has been determined, the demand for the system should be calculated using different methods to find the maximum amount of energy required throughout the year. After the total energy recovered and the total system demands have been determined, the appropriate type of, or even need for, thermal storage in the system can be determined. The next step is to determine supply and return temperatures along with flow rates of the system. This information is then used to assist in the design of the next two systems, heat exchangers and pumps. The heat exchangers that must be designed initially include the sensible heat exchanger in the exhaust stream along with the condensing economizer. The pumps can be selected, one for each loop, using the information already known about the system flow rates and the head that the pump must overcome. These two system designs can be aided from software capable of designing and giving performance characteristics of each. 85

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