Pengaruh Variasi Diameter Outlet Terhadap Tinggi Ruang Pengering Pada Kecepatan Aliran Fluida

Abstract

The performance of a solar collector is significantly influenced by design parameters and operating conditions, such as the
distance of the absorber plate from the base of the drying chamber, the ratio of the outlet pipe diameter to the height of the
drying chamber, and the operating temperature of the absorber plate. These variations can determine the temperature
distribution, airflow velocity, and heat transfer efficiency within the system. Different outlet pipe diameters and lengths change
the pressure and airflow velocity, which directly impact the drying rate. Therefore, to understand how these parameters interact
and contribute to the overall performance of the solar collector, a comprehensive study of the outlet-to-height ratio is required.
Computational Fluid Dynamics (CFD) was chosen to analyze the heat transfer and fluid flow phenomena occurring within the
solar collector in this study. CFD has proven effective in numerically evaluating the performance of thermal systems, and can
provide a detailed picture of the temperature, pressure, and flow velocity distributions without the need for time-consuming
and costly laboratory experiments. The outlet-to-height ratio was varied from 1/16:1 to 1/8:1. ¼:1, 1/3:1 and ½:1, while the
absorber plate temperature was varied from 700C, 800C and 900C. From the simulation, it was found that the outlet diameter
ratio of ½:1 with an absorber plate temperature of 900C produced the most optimum velocity of 0.07 m/s with an outlet
temperature of 46oC and an outlet pressure of 0.13 Pa.