Performance Enhancement Of Rotary Air
Preheater By The Use Of Pin Shaped Turbulators
Author(s)
H. H. Al-Kayiem & H. A. A. Mahdi
Abstract
The present paper presents the contribution on the performance enhancement
study of a regenerative Ljongstrom type air preheater. The experimental analyses
are carried out to study the performance enhancement of the system by regular
artificial roughening of the heat transfer elements using pin-shaped turbulators
(promoters). An experimental test rig is designed and fabricated to simulate the
transient operation of the rotary air-preheat system. To study the hydraulic and
thermal processes and their combined influences on the system performance, the
friction factor and the convection heat transfer coefficient, with and without the
turbulators, were evaluated from experimental measurements. The investigations
have been carried out under various designs and operational conditions. The
results were obtained and presented for Reynolds number in the range of 0.93 x
105 to 2.35 x 105 in the thermal discharge period and 0.58 x105 to 1.8 x 105 in the
thermal charging period. The roughening effect was also investigated by varying
the pin pitch to pin height ratio, P/e; additionally, the effect of the thermal
elements numbers in the working section was considered. The artificial
roughening by the pins enhanced the performance of the rotary air preheater, and
best results have been achieved at P/e=10.
Keywords: heat transfer enhancement, Rotary air preheater, turbulator,
artificial roughened surface, regenerative heat transfer, heat recovery system,
thermal experiment.
1 Introduction
Heat exchangers (HEX) are devices which provide internal thermal energy
transfer between two or more fluids at different temperatures. Common
Keywords
heat transfer enhancement, Rotary air preheater, turbulator,
artificial roughened surface, regenerative heat transfer, heat recovery system,
thermal experiment
Related Book
Other papers in this volume
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