報告書番号

W02001

タイトル（和文）

カプセル型氷蓄熱システムの高性能化に向けた技術開発 -第３報 微生物を利用した過冷却解除剤の安定性評価-

タイトル（英文）

Study on advanced encapsulated ice system3rd Report Stability of the supercooling release agent using the microorganisms

概要 （図表や脚注は「報告書全文」に掲載しております）

カプセル型氷蓄熱システムの更なる効率向上と環境保全性を念頭に、微生物を利用した過冷却解除剤の実用化に向けた技術開発に取り組んだ。氷核活性細菌（E.ananas)の紫外線殺菌試料について、過冷却解除能力の長期安定性を評価し、2000回（運転期間2年）程度の凝固融解繰り返しに対して概ね-2℃以上の高い性能を維持することを確認した。また、高温(40℃）に曝した場合の性能劣化について明らかにするとともに、大容量の殺菌に適したγ線殺菌についても、性能持続性に問題ないことを明らかにした。さらに微生物添加カプセルを試作し、カプセル群としての蓄冷熱性能を評価し、従来の解除剤であるAgIに匹敵する性能を有することを確認した。

概要 （英文）

As regards the super-cooling phenomenon, which is important factor in encapsulated ice system, we studied the super-cooling release agent using the microorganism. Though the ice nucleation active bacteria had the high super-cooling release ability, it was proved that the performance gradually lowered in long terms continuous use, when the live microorganisms were used. In the former report, in order to improve the sustainability of the super-cooling releasing ability, the effects of typical sterilization methods were compared using live E.ananas of which the releasing ability is the highest of some ice nucleation active bacteria and it was found that ultraviolet irradiations produced excellent results. In this report, we checked more long-term performance stability about the ultraviolet irradiation sample, and confirmed that it lasted for a long time in 2000 times repeated freezing-melting tests of water to which sterilized E.ananas were added. And it found that sterilized E.ananas kept the performanc even if it is left under 40℃ for 24 hours. Furthermore, it cleared tha γ-ray irradiation which was suitable for the large-scale of management produced high results, too. In addition, some thousands of heat storage capsules with ultraviolet sterilized E.ananas were built a prototype. From the evaluation of the total heat exchange of encapsulated ice system, high super-cooling releasing ability was indicated.

報告者

キーワード