2 indirect dan direct cws perbedaan indirect dan

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2. INDIRECT DAN DIRECT CWS Perbedaan indirect dan direct CWS in terletak pada teknik transfer panasnya. Jika pada indirect CWS, process fluid yang panas tidak kontak medium (air) secara langsung. Misalnya, process fluid berada dalam suatu wadah dan air dialirkan melalui pipa yang MACAM SISTEM AIR PENDINGIN Ilham Anugrah Permata Teknik Kimia FTI-ITS [email protected]
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mampu menghantarkan panas, seperti pada heat exchanger . Jika pada direct CWS , process fluid mengalami kontak langsung dengan medium. Misalnya pendinginan pada cooling tower yang membiarkan process fluid kontak dengan udara lingkungan. 3. OPEN RECIRCULATING CWS Seperti pada gambar, air yang telah diteransferi panas selanjutnya didinginkan oleh udara pada sistem terbuka, sehingga dinamakan opened . Recirculating berarti air digunkan berkali-kali melalui sistem cooled and reused . Kekurangan dari proses ini adalah adanya air yang lolos ( windage loss dan evaporation loss ) sehingga harus ada make-up water. Kontaknya dengan udara secara langsung juga menambah jumlah mineral pada air, sehingga konsentrasi mineral ini harus dikontrol (melalui blowdown water ). Sistem ini biasa ditemui di kilang minyak dan industri petrokimia. 4. CLOSED RECIRCULATING CWS Sistem closed ini menggunakan tempat tertutup untuk mentransferkan panas dari medium (air), sehingga mediumnya bisa digunakan lagi. Biasanya digunkan fluida lain
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