Research Papers

Experimental Investigation on a Rotary Regenerator Operating at Low Temperatures

[+] Author and Article Information
A. A. Rabah1

Department of Chemical Engineering, University of Khartoum, P.O. Box 321, Khartoum, Sudanrabahss@hotmail.com

A. Fekete, S. Kabelac

Institut für Thermodynamik, Helmut-Schmidt Universität, Universität der Bundeswehr Hamburg, Holstenhofweg 85, 22039 Hamburg, Germany


Dr.-Ing. Rabah is an Alexander von Humboldt Stiftung Research Fellow at Institut für Thermodynamik, Helmut-Schmidt Universität, Universität der Bundeswehr-Hamburg, Holstenhofweg 85, 22039 Hamburg.

J. Thermal Sci. Eng. Appl 1(4), 041004 (May 19, 2010) (9 pages) doi:10.1115/1.4001543 History: Received August 22, 2009; Revised February 24, 2010; Published May 19, 2010; Online May 19, 2010

This work investigated the operation conditions of a rotary regenerator operating at low regeneration temperatures, which is widely used in solar desiccant air conditioning systems. A rigorous experimental rig that facilitates the measurement of axial, radial, and angular airflow temperature distribution is used. The measurements covered balanced flow at a wide range of rotational speeds (0–24 rpm), regeneration temperatures (4070°C), and airflow rates (160–530 kg/h). The influences of those parameters on the rotary regenerator effectiveness are presented. The results revealed that the critical effectiveness occurs at 5 rpm (equivalent to 4Cr13). This is lower than that for rotary regenerators operating at high regeneration temperatures and airflow rates. The results also concluded that the Kays and London correlation is sufficient for rotary regenerators operating at low regeneration temperatures. It predicted the experimental data with an average absolute percent deviation of 6.34.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 10

Influence of mass flow rate on effectiveness

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Figure 9

Effectiveness as a function of rotational speed and regeneration temperature

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Figure 8

Angular variation of exit airflow temperatures

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Figure 7

Radial variation of the outlet airflow temperatures (Ṁ=528 kg/h and regeneration temperature of 40°C)

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Figure 6

Radial leakage paths

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Figure 5

Seal location and leakage directions

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Figure 4

Temperature measurement grid

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Figure 3

Schematic of experimental setup

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Figure 2

Regenerator configuration: (a) face of the wheel and (b) tube cross section

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Figure 1

Solar desiccant air conditioning

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Figure 11

Kays and London (3) and Worsøe-Schmidt (5) correction factors



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