Air curtain (cooling pad) khusus kertas honeycomb bahan struktural. Prinsip kerjanya adalah fenomena alam "uap air menyerap panas", yaitu air Mengalir dari atas ke bawah di bawah aksi gravitasi, membentuk film air di bergelombang permukaan serat air tirai. Ketika udara yang mengalir melewati air tirai air di dalam air film akan menguap dan menyerap panas di udara, mengambil sejumlah besar panas laten, sehingga suhu udara melewati air curtain akan berkurang, sehingga untuk mencapai tujuan pendinginan.
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