
Efisiensi penggunaan water chiller di wilayah tropis, masih sangat rendah sehingga perlu dilakukan upaya peningkatan. Hal tersebut dapat dilakukan dengan cara mengidentifikasi sebaran suhu media tanam didaerah perakaran di waktu-waktu kritis, agar diketahui kapan sebaiknya water chiller digunakan. Sebaran suhu suatu media tanam dapat disimulasikan dengan computational fluid dynamic (CFD) setelah beberapa sifat thermo-physic media tanam tersebut diketahui. Pada penelitian ini, lima sifat thermo-physic media tanam arang sekam diukur, dihitung, dan dianalisis. Kelima sifat tersebut adalah massa jenis, porositas, panas jenis, konduktivitas panas, dan pressure drop . Hasil penelitian menunjukkan nilai-nilai karakteristik thermo-physic arang sekam adalah sebagai berikut; massa jenis 153.24 kg/m3, porositas 46%, konduktivitas panas 0.0719 W/mK, dan panas jenis 7.932 kJ/kg°C, sedangkan nilai pressure drop arang sekam menurun seiring dengan peningkatan debit fluida yang dialirkan. Kata kunci: arang sekam, simulasi fluida, CFD, sifat thermo-physic
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