PEMODELAN PERPINDAHAN PANAS KONDUKSI AREA STEAMING GROUND GEDONGSONGO, PROSPEK PANASBUMI UNGARAN, JAWA TENGAH

M BADARUZ ZAMAN, Dr. rer. nat. Wiwit Suryanto, M.Si.

2015 | Tesis | S2 Ilmu Fisika

Penelitian mengenai suhu permukaan di area steaming ground Gedongsongo, sistem panasbumi Ungaran telah dilakukan. Pengukuran suhu di lokasi penelitian menggunakan sensor termokopel tipe-K dengan jangkauan pengukuran suhu dari -50 oC sampai 1300 oC dan ketelitian sebesar 0,1 oC. Pengukuran distribusi suhu di permukaan dilakukan di 25 titik mapping dan 1 titik monitoring yang pada masing-masing titik diukur suhu di permukaan, kedalaman 50 cm, serta kedalaman 100 cm. Nilai aliran panas konduksi area penelitian dihitung berdasarkan persamaan aliran panas satu dimensi. Model 2D perpindahan panas konduksi sistem panasbumi Ungaran dibuat dengan pendekatan metode elemen hingga. Berdasarkan hasil pengolahan data monitoring, lapisan tanah hingga kedalaman 100 cm masih terpengaruh oleh radiasi sinar matahari. Rata- rata aliran panas konduksi di area steaming ground Gedongsongo berdasarkan penelitian ini sekitar 16,5 W/m2. Keberadaan manifestasi steaming ground Gedongsongo diakibatkan oleh naiknya energi panas dengan suhu 170 oC melalui patahan yang terisi fluida dari kedalaman 1000 m di atas permukaan laut.

A Research of surface temperature in Gedongsongo steaming ground area, Ungaran geothermal system has been conducted. K-type thermocouple sensor with a measuring range of -50 °C to 1300 °C and accuracy of 0.1 °C used to measure temperature in research area. The temperature measurement on the surface has been conducted at 25 mapping points and 1 monitoring point. Temperature was measured at surface, 50 cm depth, and 100 cm depth. Conduction heat flow values was calculated by one-dimensional heat flow equation. 2D model conduction heat transfer of Ungaran geothermal system was calculated with finite element method approach. Based on the research results, the soil depth at 100 cm is affected by solar radiation. Heat flow average of Gedongsongo steaming ground area was calculated about 16,5 W/m2. Manifestation presence of Gedongsongo steaming ground is caused by the increase of thermal energy with temperature 170 oC through the fluid-filled fracture from a depth of 1000 meters above sea level.

Kata Kunci : Pengukuran suhu, pemodelan panas konduksi, steaming ground, prospek panasbumi Ungaran