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Rancang Bangun Pendingin Susu Hasil Pasteurisasi Menggunakan Metode Water Cooling System Gita Adi; Harianto; Yosefine Triwidyastuti
Journal of Technology and Informatics (JoTI) Vol. 1 No. 1 (2019): Vol. 1 No.1 (2019)
Publisher : Universitas Dinamika

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (475.925 KB) | DOI: 10.37802/joti.v1i1.10

Abstract

Berdasarkan SNI 01-3951-1995, untuk melakukan proses pasteurisasi susu harus mengalami pemanasan di suhu 63oC-66oC selama minimum 30 menit atau di suhu 72oC selama 15 detik. Namun penelitian yang telah ada menghasilkan sistem pasteurisasi susu yang tidak memiliki sistem pendinginan yang terpadu. Proses pendinginan susu masih dilakukan dengan cara manual (dibiarkan terbuka pada suhu ruangan). Penulis memiliki gagasan untuk membuat suatu alat pendingin susu menggunakan metode water cooling system yang dapat bekerja secara otomatis. Pendingin ini mampu mempercepat proses pendinginan susu dan mengurangi campur tangan manusia. Dari hasil percobaan, didapatkan data waktu yang dibutuhkan untuk proses pendinginan susu sampai sesuai dengan suhu ruangan 32.5oC dan tanpa perlakuan apapun adalah 7 jam 20 menit. Sedangkan durasi rata-rata waktu pendinginan menggunakan alat yang dibuat adalah 1 jam 25 menit.
Otomasi Sistem Hidroponik Wick Terintegrasi pada Pembibitan Tomat Ceri Ira Puspasari; Yosefine Triwidyastuti; Harianto
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 7 No 1: Februari 2018
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1511.175 KB)

Abstract

Process of maintaining hydroponic wick system manually requires extra energy, especially during the cherry tomato plant breeding season. Parameters, including pH value, Electrical Conductivity (EC) nutrient solution, room temperature, and humidity are needed to be considered to produce superior seeds. In this study, room temperature and humidity, pH value, and EC content in nutrient solution were controlled. The PID and on/off controller were employed in the examination plant. The PID was applied to control room temperature. On the other hand, the on/off was applied to control room humidity, pH, and EC value. PID parameters were set to Kp = 3, Ki = 2, and Kd = 10. As a result, the system produced rise time of 60 minutes, overshoot of 1.17%, and settling time of 57.5 minutes. At the same time, the on/off controller was able to settle the humidity from 61% to 80% within 150 seconds. Moreover, reduction of the pH value from 6.9 to 5.34 can be reached within 12.8 minutes. The study of the EC showed that the longer for the water valve to open, the longer it takes to reach the set point. The study also showed that the rate of cherry tomato plant height is 2.675 cm/week utilizing both of the PID and the on/off controller, while it can only reach 0.2 cm/week without controller. Furthermore, examination on the leaf numbers per week showed that the leaf grew 2 sheets per week when both controllers were applied, while it grew no sheet without controller.