Improvement in drying performance through sample movement change in tumble dryers

Abstract

To improve the drying performance of a tumble dryer, the movement of sample clothes as a function of the mechanical action of the dryer was analyzed. The movement of cotton shirts inside a tumble dryer, represented by sample movement patterns, occupancy, and velocity distribution, were quantitatively analyzed using sample movement indices. The differences in the sample movement and the subsequent drying performance were evaluated by varying the drum rotational speed and direction. A drum rotational speed of 50 rpm produced the best sample properties and a short drying period, as the samples actively moved primarily in the center of the drum. Changes in the direction of the drum rotation reduced the drying period and minimized wrinkles in the samples when the frequency of changes to the rotational direction was minimized; however, the change aggravated shrinkage and damaged the samples. The best drying performance was observed when the direction of the drum rotation was changed every 2 seconds. The correlation and regression analysis demonstrated that the sample movements occurred at the center of the drum and that the drying period decreased while the drying performance improved, as the samples were subjected to complex movements and the mixing between them increased.

Determining optimal drying conditions through analysis of the sample movement in a heat pump dryer

“…The rotating speed of the drum selected by 50 rpm, which the fabric in the drum dryer showed the most diverse movement and efficient drying performance. 14 The hot air flow temperature was maintained at 55.0 AE 2.0 C, flow rate was 0.2 AE 0.1 m/min, and drum rotation direction was clockwise.…”

“…This study aims to design a program according to the drying sections by considering the effect of sample movement, which is changed by varying the hot air flow and drum rotations, on the drying performance. At the beginning of drying, only hot air flow was introduced without drum rotation; in the middle of drying, the drum rotation speed was changed to 50 rpm along with hot air flow, leading to the highest evaporation rate; and in the latter of drying, the drum rotation speed, which had improved the fabric properties, was changed to 57.5 rpm and the drum rotation direction was changed every 2 s. 14 Therefore, the drying period herein was more than that under the existing drying condition of 50 rpm; however, the energy consumption was within the error range; further, a 36.9% decrease in shrinkage and a 10.8% improvement in wrinkle recovery were obtained (Table 3).…”

Rancang Bangun dan Pengujian Mesin Pengering Rotari dengan Pemanas dan Penggerak Tenaga Surya pada Pengeringan Jamur Tiram

“…Sedangkan [12] mengeringkan biji jagung menggunakan putaran 8, 12, 16 dan 24 rpm memperoleh informasi putaran 24 rpm menghasilkan pengeringan yang lebih cepat. Pengeringan tekstil dilakukan pada putaran lebih tinggi lagi seperti [13] menggunakan 50 rpm.…”