Main Article Content

Abstract

Abstract
Freezing is the best method to preserve the quality of food for a long period of time compared to other technologies such as drying and canning. Technology of freezing requires more energy than other preservation technologies, however. Therefore, an energy efficient freezer is needed. This research aims to the effect of utilization of a receiver to improve the freezer performance efficency. The research is conducted on freezer used to cool and freeze 1 kg of water from a temperature of 27oC to -14oC, then a receiver is installed in the freezer and the same research is conducted (the type and setting of expansion valve and test materials are the same). The refrigerant medium is R404A working fluid. The receiver is installed between condenser and filter dryer in the system circuit of the freezer. The result shows that the utilization of receiver increases the coefficent of performance (COP) from 2.24 to 2.69 and reduce the electricity consumption. The time required for freezing becomes shorter particularly on the transition of liquid to solid phase (ice) . Consequently, the freezing rate becomes quicker and provides advantages for application of food freezing.

Abstrak
Pembekuan merupakan metode yang paling baik untuk menjaga kualitas makanan dalam jangka waktu lama, dibanding dengan teknologi lain seperti pengeringan dan pengalengan. Namun teknologi pembekuan membutuhkan lebih banyak energi daripada teknologi pengawetan lainnya, karena itu diperlukan mesin pembeku yang hemat energi. Penelitian ini bertujuan untuk mempelajari pengaruh penggunaan receiver untuk meningkatkan efisiensi kinerja mesin pembeku. Penelitian dilakukan pada mesin pembeku yang digunakan untuk mendinginkan dan membekukan air 1 kg dari suhu 27oC sampai -14oC, selanjutnya penelitian mesin pembeku ditambahkan receiver dan dilakukan penelitian yang sama (bukaan katup ekpansi diatur tetap dan sama, serta bahan uji dilakukan dalam kondisi sama). Media pendingin menggunakan fluida kerja R404A. Receiver diletakkan di antara kondensor dan filter dryer pada rangkaian sistem mesin pembeku. Hasil penelitian menunjukkan bahwa penggunaan receiver pada mesin pembeku berdampak pada peningkataan koefisien kinerja (COP) dari 2.24 menjadi 2.69, dan terjadi penghematan konsumsi energi listrik. Waktu proses pembekuan menjadi lebih singkat, khususnya pada tahap perubahan fase cair menjadi es, sehingga laju pembekuan menjadi lebih cepat dan memberi keuntungan untuk penerapan pada pembekuan bahan pangan.

Keywords

Receiver freezer energy saving

Article Details

Author Biographies

Paulus Sukusno, 1. Teknik Mesin Politeknik Negeri Jakarta 2. Pasca Sarjana Program S3 Ilmu Keteknikan Pertanian IPB

Teknik Mesin Politeknik Negeri Jakarta,

Pasca Sarjana Program S3
Ilmu Keteknikan Pertanian

Armansyah H. Tambunan, Institut Pertanian Bogor.

Departemen Teknik Mesin dan Biosistem. Institut Pertanian Bogor.

Radite Praeko Agus Setiawan, Institut Pertanian Bogor.

Departemen Teknik Mesin dan Biosistem. Institut Pertanian Bogor.

Yohanes Aris Purwanto, Institut Pertanian Bogor

Departemen Teknik Mesin dan Biosistem. Institut Pertanian Bogor

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