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Research Papers: Heat Exchangers

Performance Analysis of Printed Circuit Heat Exchanger for Supercritical Carbon Dioxide

[+] Author and Article Information
Jiangfeng Guo

Institute of Engineering Thermophysics,
Chinese Academy of Sciences,
Beijing 100190, China;
School of Engineering Science,
University of Chinese Academy of Sciences,
Beijing 100049, China
e-mail: gjf1200@126.com

Xiulan Huai

Institute of Engineering Thermophysics,
Chinese Academy of Sciences,
Beijing 100190, China;
School of Engineering Science,
University of Chinese Academy of Sciences,
Beijing 100049, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 16, 2016; final manuscript received December 4, 2016; published online February 28, 2017. Assoc. Editor: Ali Khounsary.

J. Heat Transfer 139(6), 061801 (Feb 28, 2017) (9 pages) Paper No: HT-16-1394; doi: 10.1115/1.4035603 History: Received June 16, 2016; Revised December 04, 2016

A printed circuit heat exchanger (PCHE) was selected as the recuperator of supercritical carbon dioxide (S-CO2) Brayton cycle, and the segmental design method was employed to accommodate the rapid variations of properties of S-CO2. The local heat capacity rate ratio has crucial influences on the local thermal performance of PCHE, while having small influences on the frictional entropy generation. The heat transfer entropy generation is far larger than the frictional entropy generation, and the total entropy generation mainly depends on the heat transfer entropy generation. The axial conduction worsens the thermal performance of PCHE, which becomes more and more obvious with the increase of the thickness and thermal conductivity of plate. The evaluation criteria, material, and size of plate have to be selected carefully in the design of PCHE. The present work may provide a practical guidance on the design and optimization of PCHE when S-CO2 is employed as working fluid.

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Figures

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Fig. 1

(a) S-CO2 recompressing cycle layout and (b) the relation of specific heat with temperature in low temperature recuperator

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Fig. 2

The schematic diagram of subheat exchangers

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Fig. 3

The schematic diagram of cross section for printed circuit heat exchanger

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Fig. 4

The comparisons between the present simplified solutions and Kroeger's analytical solutions

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Fig. 5

(a) The local heat capacity rate ratio and (b) the localeffectiveness along the flow direction of hot fluid at kw = 20 W/m K, Hc1 = 2.5 mm and Ltot = 1.5 m

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Fig. 6

(a) The local heat transfer entropy generation number and (b) local pressure drop entropy generation number along flow direction of hot fluid at kw = 20 W/m K, Hc1 = 2.5 mm, and Ltot = 1.5 m

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Fig. 7

The relations of (a) total heat transfer rate and (b) total heat transfer entropy generation number with the mass flow rate of cold fluid at kw = 20 W/m K, Hc1 = 2.5 mm, and Ltot = 1.5 m

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Fig. 8

The relations of (a) total heat transfer and pressure drop entropy generation numbers, and (b) total entropy generation number with the total length of heat transfer channel at kw = 20 W/m K, Hc1 = 2.5 mm, and m˙c  = 1.3 kg/s

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Fig. 9

The relations of (a) total heat transfer rate and (b) total heat transfer entropy generation number with the total length ofheat transfer channels at kw = 50 W/m K, Hc1 = 2.5 mm and m˙c  = 1.2 kg/s

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Fig. 10

The relations of (a) local effectiveness and (b) total entropy generation number with the thickness of cold plate at kw = 20 W/m K, Ltot = 1.5 m and m˙c  = 1.3 kg/s

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Fig. 11

The relations of (a) total heat transfer rate and (b) total heat transfer entropy generation number with the thickness of cold pate at kw = 20 W/m K, Ltot = 1.5 m and m˙c  = 1.3 kg/s

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Fig. 12

The relations of (a) total heat transfer rate and (b) total heat transfer entropy generation number with the thermal conductivity of plate at Hc1 = 2.5 mm, Ltot = 1.5 m, and m˙c  = 1.3 kg/s

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