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Derek N. Young
Colorado State University, Fort Collins, CO 80524, USA

Todd M. Bandhauer
Interdisciplinary Thermal Science Laboratory Colorado State University, Fort Collins, CO 80524, USA

DOI: 10.1615/TFEC2018.tcn.021605
pages 1821-1824

KEY WORDS: Waste Heat Recovery, Technoeconomic Analysis


The wide availability of low grade waste heat streams provides an opportunity to reduce energy consumption and improve efficiencies in a number of different applications using thermally activated cooling systems. The current study investigated the effects of working fluid selection on a turbocompression cooling system that utilizes low grade waste heat available in diesel engine coolant. A coupled thermodynamic, heat transfer, and cost model was developed to better understand technoeconomic performance of the system. The simple payback period of the system was minimized for a specific design condition using a search and find optimization technique. In addition, a sensitivity study was performed to determine which heat exchanger effectiveness had the largest influence on payback period. The optimization routine was performed with a number of different working fluids, including low Global Warming Potential fluids, to find an overall minimum payback period. Of the fluids examined, it was found that a turbocompression cooling system with R600a as the working fluid had the minimum simple payback period (1.86 years) with an initial capital cost of $201,432. In this system, the payback period was most sensitive to the two-phase region of the power cycle condenser.

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