Prediction in off-design operation for the helical heat recovery exchanger

Nguyen Minh Phu * , Hoang Trong Tran Huy , Le The Truyen and Trinh Tien Tho

* Corresponding author (nmphu@nomail.com)

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Received: 25 Jan 2016
Revised: 20 May 2016
Accepted: 08 Jul 2016
Published: 30 Jul 2016
DOI: 10.22144/ctu.jsi.2016.007
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Nguyen, M. P., Hoang, T. T. H., Le, T. T., & Trinh, T. T. (2016). Prediction in off-design operation for the helical heat recovery exchanger. CTU Journal of Innovation and Sustainable Development , (Renewable Energy), 46-51. https://doi.org/10.22144/ctu.jsi.2016.007
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No. Special Issue on Renewable Energy (2016)

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Abstract

Helical heat exchangers are commonly used to exchange the thermal energy in waste heat recovery systems. Ammonia rectifier in absorption chiller and heat recovery steam generator are examples typically found in open literature. They are widely employed because of its compactness, high heat exchange rate, compensation of thermal expansion, vibration resistance, simple construction, and low capital cost. Heat exchanger researches have almost focused on straight tubes. However, study on helical heat exchanger has not been paid attention. In this study, a simplified model is developed to predict single phase heat transfer and pressure loss in the helical heat exchanger under various operating conditions without geometrical information inside the exchanger required. Methods of LMTD and e-NTU, and selective empirical correlations are presented in the model. Simulation results were achieved good agreement with the experimental data with a moderate tolerance. The model would be expected as a good tool for designers to the pre-design and correct selection of helical heat exchanger in thermal network.
Keywords: Helical heat exchanger, Modelling, Experimental validation

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