Jelaskan Dehydrofreezing dari Teknologi pembekuan makanan

Adalah metode pembekuan makanan yang diaplikasikan khususnya pada makanan berkadar air tinggi. Makanan didehidrasikan untuk memenuhi kadar air yang diperlukan sebelum dibekukan. Ketika produk seperti buah dan sayuran segar dengan kadari air tinggi dibekukan, masalah utama yang mengganggu kualitas adalah peningkatan volume akibat kadar air di dalamnya yang dapat menyebabkan kerusakan jaringan. Dehidrasi parsial dapat dilakukan dengan pengering udara konvensional atau pengeringan osmotik. Dehidrasi parsial dapat memberikan berbagai keuntungan, diantaranya menurunkan beban transfer kalor produk makanan, mempermudah dan mengurangi biaya penyimpanan, penanganan, dan pengiriman.

Konservasi energi dalam proses pembekuan

Pembekuan adalah kegiatan dengan penggunaan energi yang intensif. Keefektivan biaya dari kegiatan pembekuan tergantung pada beban pendinginan produk makanan yang menentukan besar energi yang dikonsumsi alat pembeku. Memindahkan panas pada awal proses pembekuan merupakan hal yang tersulit dan membutuhkan banyak waktu, sehingga titik akhir pembekuan, yang pada umumnya sulit ditentukan, harus diperkirakan dengan tepat dan amat menentukan total konsumsi energi alat pembeku. Manipulasi bahan penyusun produk makanan, automatisasi alat pendingin, pelacakan perubahan fase air-es, dan sebagainya, juga menjadi hal yang penting dalam penentuan total energi yang dibutuhkan dalam proses pembekuan karena mencegah pemindahan panas yang berlebihan.

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