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Research Papers: Heat Exchangers

Transient Temperature Response of Variable Flow Heat Exchangers in a Marnoch Heat Engine

[+] Author and Article Information
P. Saneipoor

Faculty of Engineering and Applied Science,
University of Ontario Institute of Technology,
Oshawa, ON L1H 7K4, Canada

G. F. Naterer

Faculty of Engineering and Applied Science,
Memorial University,
St. John's, NF A1B 3XB, Canada
e-mail: gnaterer@mun.ca

I. Dincer

Faculty of Engineering and Applied Science,
University of Ontario Institute of Technology, Oshawa, ON L1H 7K4, Canada

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 19, 2013; final manuscript received July 14, 2014; published online August 26, 2014. Assoc. Editor: Oronzio Manca.

J. Heat Transfer 136(11), 111801 (Aug 26, 2014) (8 pages) Paper No: HT-13-1028; doi: 10.1115/1.4028176 History: Received January 19, 2013; Revised July 14, 2014

Within a Marnoch heat engine (MHE), a water/glycol mixture transfers heat from the heat source into a set of variable flow heat exchangers and removes heat from adjoining cold heat exchangers. The compressed dry air is used as the working medium in this heat engine. The MHE has four shell and tube heat exchangers, which operate transient and variable flow conditions. A new transient heat transfer model is developed to predict this transient behavior of the heat exchangers for different flow regimes and temperatures. The results from the model are validated against experimental results from an MHE prototype. The heat transfer model shows 85% agreement with measured data from the MHE prototype for the individual heat exchangers. This model can be used for similar shell and tube heat exchangers with straight or U-shaped tubes. The heat transfer model predicts the gas temperature on the shell side, when a step change is imposed on the liquid entering the tubes.

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References

Figures

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Fig. 1

(a) Basic mechanical configuration of the MHE with two heat exchangers (modified from 1 and 2) and (b) experimental MHE prototype

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Fig. 3

Heat transfer section between liquid, tube, and air

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Fig. 2

Heat exchanger of the MHE—(a) shell with liquid and gas inlets and outlets and (b) multipass—multi-inlet/outlet heat exchanger

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Fig. 4

Temperature and pressure changes of one heat exchanger pair during one charging and discharging period

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Fig. 5

Pressure changes in one heat exchanger pair (1 and 2) during five sequential operational cycles

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Fig. 6

Comparison between measured temperatures and MHE model during heating mode

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Fig. 7

Comparison between measured temperatures and MHE model during cooling mode

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Fig. 8

Comparison between measured pressures and MHE model during heating mode

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Fig. 9

Comparison between measured pressures and MHE model during cooling mode

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