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~ Analisis Performansi Alat Pengering Tenaga Surya

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~ Analisis Performansi Alat Pengering Tenaga Surya

ANALISIS PERFORMANSI ALAT PENGERING TENAGA SURYA DENGAN MENGGUNAKAN BATU KRIKIL SEBAGAI PELAT KOLEKT

Biasanya dalam proses pengeringan, pelat logam tipis dilapisi waraa hitam digunakan sebagai penyerap radiasi matahari. Pelat logam harganya mahal, sehingga penggunaaniiya tidak memungkinkan bagi masyarakat pedesaan yang mempunyai penghasilan rendah untuk mengeringkan hasil panennya seperti : padi, jagung, kacang dan Iain-lain. Temperatur udara untuk proses pengeringan umumnya tidak terlalu tinggi kira-kira . Mengingat kebutuhan tersebut maka memungkinkan penggunaan batu krikil yang dicat hitam sebagai pengganti pelat logam. Telah didesain dan dibuat sebuah prototipe alat pengering tenaga surya dengan menggunakan batu krikil sebagai kolektor.

Dimensi kolektor adalah lebar 0,9 m dan panjang 1,4 m. Alat ini digunakan untuk kapasitas pengeringan gabah 25 kg. Karena massa kolektor terbuat dari krikil, relatif besar terhadap massa pelat logam,maka metode unsteadi-state digunakan dalam perhitungan performansi pengeringan tenaga surya. Dari percobaan didapat efisiensi kolektor rata-rata adalah 51,09% dan efisiensi pengeringan rata-rata adalah 24,65%. Efek transient yang dihasilkan sangat kecil, karena pelat kolektor terbuat dari batu krikil tebalnya hanya 0,05 m. Oleh karena itu performansi yang dihasilkan mendekati kondisi steadi-state. Alt. Description

Usually in solar drying process, a metal sheet painted in black color is used as a solar absorber. The price of metal sheet is expensive, thus the method of using a metal sheet as collector is not appropriate to rural people having low income to dry their product of agriculture,such as rice, corn, bean, etc. The air temperature for drying process generally is not so high, about

Knowing this requirement, it is possible to use gravels painted in black color to replace a metal sheet as collector. Design of solar drying process using gravels as a collector has been done. Experimentation in the solar drying having dimension of collector 0.9 m width and 1.4 m length has been conducted to dry a rice of 25 kg.

Because the mass of the collector made from gravels is big relatively to the metal sheet, the unsteady-state analysis is used to evaluate the performance of the solar drying. From the experiment, the average collector efficiency is about 51.09% and average drying efficiency is about 24.65%. Because the thick of gravels plate is not so thick, the effect of transient is weak, and closely to steady-state analysis.

Created by MURTI, MADE RICKI 

 

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