Experimental assessment of convective heat transfer and pressure drop correlation of R1234ze(E) for a supercritical heat
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DOI 10.1007/s12206-020-1037-z
Journal of Mechanical Science and Technology 34 (11) 2020 Original Article DOI 10.1007/s12206-020-1037-z Keywords: · Convective heat transfer coefficient · Pressure drop · R1234ze(E) · Supercritical heat exchanger · Supercritical organic Rankine cycle
Correspondence to: Seon-Chang Kim [email protected]
Citation: Lee, C., Ko, J.-W., Ji, H. Y., Kim, S.-C. (2020). Experimental assessment of convective heat transfer and pressure drop correlation of R1234ze(E) for a supercritical heat exchanger in the organic Rankine cycle. Journal of Mechanical Science and Technology 34 (11) (2020) 4809~4818. http://doi.org/10.1007/s12206-020-1037-z
Received April 1st, 2020 Revised
July 12th, 2020
Accepted August 10th, 2020
Experimental assessment of convective heat transfer and pressure drop correlation of R1234ze(E) for a supercritical heat exchanger in the organic Rankine cycle Cheonkyu Lee, Ji-Woon Ko, Hyung Yong Ji and Seon-Chang Kim Clean Energy R&D Department, Research Institute of Clean Manufacturing System, Korea Institute of Industrial Technology (KITECH), Cheonan-si, Korea
Abstract
In the supercritical organic Rankine cycle, the process of absorbing heat from a heat source occurs in the supercritical region. The supercritical heat exchanger, which is responsible for heat exchange between the heat source and working fluid in the supercritical region, is a crucial component of this cycle. In this study, the correlation of the Nusselt number and Darcy’s friction factor was proposed, according to the experimental result of the heat transfer and pressure drop of the supercritical R1234ze(E) for the temperature ranges below and above the pseudo-critical temperature. Correlations of the Nusselt number and Darcy's friction factor agree with the experimental results within ±20 %. Supercritical heat exchangers were designed and tested using the proposed correlations. The developed supercritical heat exchanger satisfied the condition within a -0.5 % margin of error, based on the heat exchange rate between the design and experimental results.
† Recommended by Editor Yong Tae Kang
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Low-grade heat sources, typically classified below 230 °C, account for 50 % or more of the total heat generated worldwide [1, 2]. This thermal energy is released across the world and constitutes an incalculable amount of the energy that is released into the ambient atmosphere [2]. The organic Rankine cycle (ORC) could produce electric power using an organic fluid by means of these low-grade heat sources. The ORC is similar to a general steam Rankine cycle in terms of components and operating principles. However, the principal difference is that the vaporization temperature of the organic working fluids is lower than that of steam. Accordingly, the ORC could operate on a considerably low-temperature heat source than that of a steam Rankine cycle [3]. ORC mainly consists of four components, namely
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