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- W2980485673 abstract "In most rural villages in Alaska, power is generated by diesel generators and fossil fuels are burned for power and heating. Due to the extremely isolated conditions of most of these villages i.e., no road infrastructure, the costs of fuel, travel, system installation and maintenance (no technicians on-site) are very expensive. The primary goal of this work is to investigate gas-to-liquid heat transfer performance of a concentric tube heat exchanger with twisted tape inserted in corrugated tube and its modifications, and evaluate the impact on engine performance, economics, and reduced CO2 through exhaust heat recovery (exhaust contains 1/3 of energy of fuel consumed) of a heavy duty diesel generator (120ekW rated load), such as are being used in rural Alaska communities. This type of heat exchanger is expected to be inexpensive to install, require only minimal maintenance, and provide effective heat transfer, with minimal effect on exhaust emissions of diesel engines. Most previous research of corrugated concentric heat exchangers has investigated liquid-to-liquid or gas-to-gas heat transfer in corrugated tubes, not gas-to-liquid heat transfer. For this study, the SolidWorks Flow Simulation computer program is used. To validate program reliability, simulation results obtained through this software are compared with renowned correlations and field measurements. Simulations are then conducted for the corrugated concentric heat exchanger with twisted tape and its modifications to determine the optimal design. Twisted tape modifications include perforated twisted tape, dual twisted tape, twisted tape with cuts, serrated twisted tape, and twisted tape with rod. The maximum enhancement in the rate of heat transfer is found in an annularly corrugated tube heat exchanger, with a twisted tape with rod inserted. The enhancement is limited by the requirement of pressure drop constraint of the exhaust gas passing through the heat exchanger. This exchanger transfers about 279.3%, 126.17%, and 35.1% more heat compared to plain tube, annularly corrugated tube heat exchangers without twisted tapes, and annularly corrugated tube heat exchangers with plain twisted tape. Based on optimal results for a 120 kWe diesel generator, installing an annularly corrugated tube heat exchanger with a plain twisted tape insert can save 2,266 gallons of fuel annually; with a rod twisted tape insert, an annual savings of up to7622 gallons is attained. This is a savings of approximately 4252 gallons more than the presently installed heat recovery system can attain. In addition, CO2 emissions are reduced by up to 43 metric tons annually." @default.
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- W2980485673 date "2019-01-01" @default.
- W2980485673 modified "2023-09-23" @default.
- W2980485673 title "Numerical Study of an Exhaust Heat Recovery System Using Corrugated Tube Heat Exchanger with Modified Twisted Tape Inserts" @default.
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