Analisa Efisiensi Coling Tower di PT. Geo Dipa Energi Unit Dieng

RIENETTA I D S, Ir. Soeadgihardo Siswantoro, M.T.

2020 | Tugas Akhir | D3 TEKNIK MESIN

Salah satu komponen penting pada Pembangkit Listrik Tenaga Panas Bumi (PLTP) adalah cooling tower. Cooling tower adalah alat penukar panas yang berfungsi membuang panas dari kondensat ke lingkungan. Proses pendinginan pada cooling tower di PT. Geo Dipa Energi Unit Dieng diharapkan mencapai suhu yang mendekati temperatur wet bulb ambien yaitu 18,8 derajat celcius. Selanjutnya, kondensat yang telah didinginkan akan dialirkan ke main condenser menjadi spray pendingin uap. Apabila air pendingin memiliki temperatur yang terlalu tinggi, akan menyebabkan tekanan meningkat dan vakum pada main condenser berkurang. Untuk mengetahui kinerja cooling tower, diperlukan analisa performa cooling tower, diantaranya adalah analisa dan perhitungan terhadap cooling capacity, range, approach dan efisiensi cooling tower. Selanjutnya analisa tersebut akan menjadi salah satu pertimbangan perusahaan untuk melakukan perawatan atau penggantian. Hasil analisa menunjukkan bahwa cooling capacity yang dimiliki cooling tower pada bulan April 2020 adalah 37.522.997,57 MJ/hr dengan nilai range sebesar 11,88 derajat celcius, nilai approach sebesar 3,48 derajat celcius, dan efisiensi sebesar 77,34 persen.

The one of important component in Geothermal Power Plant (PLTP) is cooling tower. Cooling tower is a heat exchanger that works to remove heat from the condensate into the environment. The cooling process in the cooling tower at PT. Geo Dipa Energy Dieng Unit is expected to reach temperatures close to the ambient wet bulb temperature that is 18.8 derajat celcius. Furthermore, the condensate that has been cooled will be flowed to the main condenser to be a steam cooling spray. If the cooling water has a temperature that is too high, the pressure will increase and vacuum in the main condenser decreases. To find out the cooling tower performance, an analysis of cooling tower performance is needed, including analysis and calculation of the cooling capacity, range, approach and efficiency of the cooling tower. Furthermore, this analysis will be one of the company's considerations for maintenance or replacement. The analysis showed that the cooling capacity of the cooling tower in April 2020 was 37,522,997.57 MJ / hr with a range value was 11.88 derajat celcius, an approach value was 3.48 derajat celcius, and efficiency was 77.34 persen.

Kata Kunci : Cooling Tower, Efisiensi, Range, Approach, Cooling Capacity