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Chapter 12 Conclusions This chapter discusses the accomplished tasks related to the project objectives and the future work needs to be done to the GM. It will also listed out the comments about the GM based on the experience obtained from this testing project. The objectives of this project as mentioned in the Introduction chapter include: 1. Objective 1: To prove that an improvement of the efficiency of the diesel power plant by about 10% (i.e. about 4% of fuel efficiency) is achievable through the use of an organic Rankine cycle (ORC) system, which uses waste heat contained in diesel engine jacket water and exhaust. Based on experimental results, the maximum net efficiency experienced at the heating fluid temperature of 195oF (jacket water temperature) is about 7.4%. For more than 50% of fuel energy as waste heat (in jacket water and exhaust), the potential of fuel efficiency improvement is about 3.7%, which is close to the target of 4% fuel efficiency improvement. In addition, if higher temperature heat source (obtainable from exhaust) is used and the cap of the GM output restriction is moved from 50kW to 65kW (by a simple retrofitting process) to improve the maximum efficiency for high temperature fluid (245oF), the 4% improvement in fuel efficiency seems reachable. 2. Objective 2: To evaluate feasibility, operation and maintenance requirements, and payback time of applying a selected ORC system. Based on the observation and operation experience, the system is considered very reliable (Under normal operation condition, no foreseen technical problems are expected for long term operation) and no advanced technology background is needed for operation. Considering maintenance requirements, no advanced technology background are needed for maintenance and not much of extra cost is needed beside the consuming materials (filters, lube oil, etc.), if the GM routine maintenance schedule is incorporated into the routine diesel genset maintenance schedule. (Please refer to Chapter 10 Data Analysis for details.) Based on the reliability testing results (at full capacity of the GM), the estimated payback time is 3.6 years for a 0% interest rate and 4.6 years for a 10% interest rate. (Please refer to Chapter 10 Data Analysis for details.) 3. Objective 3: To develop guidelines for ORC system selection, operation, and maintenance; and to evaluate the potential impact of applying waste heat ORC systems on rural Alaska economy, fuel consumption, and emissions and greenhouse gas reductions. Guidelines for ORC System Selection: 58PDF Image | Optimizing Heat Recovery Systems for Power Generation in Rural AK
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