Preprint Article Version 1 This version is not peer-reviewed

Experimental Study on the Heat Transfer Characteristics of the Enhanced Fin-Tube Heat Exchanger Applied a Coiled Turbulator

Version 1 : Received: 5 January 2017 / Approved: 5 January 2017 / Online: 5 January 2017 (09:07:14 CET)

How to cite: Byun, S.; Lee, S.; Cha, J.; Wang, Z.; Kwon, Y. Experimental Study on the Heat Transfer Characteristics of the Enhanced Fin-Tube Heat Exchanger Applied a Coiled Turbulator. Preprints 2017, 2017010021 (doi: 10.20944/preprints201701.0021.v1). Byun, S.; Lee, S.; Cha, J.; Wang, Z.; Kwon, Y. Experimental Study on the Heat Transfer Characteristics of the Enhanced Fin-Tube Heat Exchanger Applied a Coiled Turbulator. Preprints 2017, 2017010021 (doi: 10.20944/preprints201701.0021.v1).

Abstract

This study presents the comparison of heat transfer capacity and pressure drop characteristics between a basic fin-tube heat exchanger and a modified heat exchanger with the structural change of branch tubes and coiled turbulators. All experiments were carried out using an air-enthalpy type calorimeter based on the method described in ASHRAE standards, under heat exchanger experimental conditions. 14 different kinds of heat exchangers were used for the experiment. Cooling and heating capacities of the turbulator heat exchanger were excellent, compared to the basic one. As the insertion ratio of the coiled turbulator and the number of row increased, the heat transfer performance increased. However, the capacity per unit area was more effective in 4 rows than 6 rows, and the cooling performance of the 6 row turbulator heat exchanger (100% turbulator insert ratio) was down to about 6% than that of 4 row one. As the water flow rate and the turbulator insertion ratio increased, the pressure drop of the water side increased. This trend was more pronounced in 6 rows. In the cooling condition, the pressure drop on the air side was slightly increased due to the generation of condensed water, but was insignificant under the heating condition. The power consumption of the pump was more affected by the water flow rate than the coiled turbulator. The equivalent hydraulic diameter of a tube by the turbulator was reduced and then the heat transfer performance was improved. Thus, the tube diameter was smaller, the heat flux was better.

Subject Areas

capacity; cooling and heating; fin-tube heat exchanger; pressure drop; turbulator

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Comment 1
Received: 5 January 2017
Commenter: Sun-Joon Byun
The commenter has declared there is no conflict of interests.
Comment: Significant contribution
Most conclusions supported (minor revision needed)
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