水袋モデル凍結時の電子式膨張弁と温度式膨張弁による冷媒制御の比較について
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概要
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The Freezing efficiency of the evaporator for quick freezing was compared between one equipped with electronic control expansion valves(EEV) and one with thermostatic expansion valves (TEV) through the experiment of freezing watar bag model. For experimental freezig, the quick freezer was stocked with 40 vinil bags containig 8ｌ of water following usual procedure taken by tuna fishing boats, and then the refrigerator was operated until the central temperature of the vinyl bags reached -55℃. A low temperature flow meter for refrigerant and a large-sized vacuum gauge (JIS ♯ 0.5) were newly installed for the experiment. As a result of this experiment, whereas TEV took 14.8 h to get the desired temperature (-55℃), EEV needed 12.3 h, shortening the time by 17％. We conclude that we can give full play to the efficiency of a refrigerating compressor by a narrow room and a small cost to install EEV.
- 長崎大学の論文
長崎大学 | 論文
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