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Abstract
Abstract
Chili production in Indonesia is very unstable because most of chili production areas are open field that are quite influenced by weather. Therefore, it is important to develop hydroponic technology for chili cultivation under greenhouse. As energy-efficient cooling system for tropical greenhouses, root zone cooling could be applied by flowing cooled water in pipes that are burried in the root zone. Determining the space between the pipes for flowing the cooled water requires temperature distribution in the root zone. The objective of this research were to find out the temperature distribution in the root zone, to simulate temperature distribution with based on computational fluid dynamics, and to validate the simulated root zone temperature. The results showed that an uniform horizontal temperature distribution during the day time and night time. Uniform vertical
temperature distribution were also noted during the night time. There were quite wide temperature variation in the root zone during the day time, vertically. The validation results showed that temperature distribution in the root zone could be predicted accurately by computational fluid dynamics as indicated by the value of R2 obtained at 0.84 and the linear equation is y axis approaches the value of x axis. Therefore, the predicted temperature distribution would be very useful in determining zone cooling system for chili cultivation in hydroponic system under tropical greenhouse.
Abstrak
Produksi cabai di Indonesia sangat tidak stabil karena sebagian besar areal budidaya tanaman cabai dilakukan di lahan terbuka yang sangat dipengaruhi oleh cuaca. Oleh karena itu, penting untuk mengembangkan teknologi hidroponik untuk budidaya tanaman cabai di dalam rumah tanaman. Metode pendinginan yang efisien dari segi konsumsi energi untuk rumah tanaman di daerah tropika salah
satunya adalah pendinginan daerah perakaran. Pendinginan daerah perakaran dapat diterapkan dengan mengalirkan air dingin di dalam pipa yang dibenamkan dalam daerah perakaran tersebut. Penentuan jarak antar pipa pendingin tersebut memerlukan sebaran suhu di daerah perakaran tersebut. Tujuan dari
penelitian ini adalah untuk memprediksi sebaran suhu daerah perakaran, melakukan simulasi suhu daerah perakaran menggunakan computational fluid dynamics, dan melakukan validasi hasil simulasi sebaran suhu daerah perakaran. Hasil penelitian menunjukkan bahwa sebaran suhu daerah perakaran secara horizontal ternyata seragam pada waktu siang maupun malam hari. Data sebaran suhu daerah perakaran yang seragam secara vertikal juga diperoleh pada waktu malam hari. Sebaran suhu daerah perakaran secara vertikal pada siang hari ternyata cukup bervariasi. Validasi menunjukkan bahwa sebaran suhu daerah perakaran dapat diprediksi dengan baik menggunakan computational fluid dynamics yang ditunjukkan dengan nilai R2 yang diperoleh sebesar 0.84 dan diperoleh persamaan y yang mendekati nilai x. Oleh karena itu, suhu daerah perakaran hasil prediksi dapat digunakan untuk perancangan zone cooling system budidaya tanaman cabai secara hidroponik di dalam rumah tanaman.
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