Development of an ice-water direct contact heat exchanger in a new district cooling system utilizing an ice-water mixture (3rd report: Application test in a test plant and design guideline)

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  • 氷水輸送式地域冷房システム用直接接触式熱交換器の開発（第３報：パイロットプラントによる実証試験と性能評価及び設計基準）
  • ヒョウスイ ユソウシキ チイキ レイボウ システムヨウ チョクセツ セッショクシキ ネツコウカンキ ノ カイハツ ダイ3ポウ パイロットプラント ニ ヨル ジッショウ シケン ト セイノウ ヒョウカ オヨビ セッケイ キジュン
  • 3rd report: Application test in a test plant and design guideline
  • 第3報:パイロットプラントによる実証試験と性能評価及び設計基準

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Abstract

In a district cooling system (DCS), a new system that utilizes an ice-water mixture is under development to reduce the pipe size and pumping power for transportation by increasing the energy density of the cold medium. To practically apply this new DCS, the development of effective heat equipment is required to convert an ice-water mixture into cold water at the end of the distribution system. For this purpose, the authors proposed a vertical cylinder type direct contact heat exchanger (DCHE), and reported its heat transfer characteristics in the preceding papers. In this work, the DCHE is installed in a pilot plant to study its operational behavior. The pressure loss and the outlet water temperature fluctuations caused due to unstable ice fractions are measured to test its performance. Based on the results, a standard is proposed for the optimum size of the DCHE in order to control the outlet water temperature within the required range, in spite of the unavoidable unstable ice fractions in the supplied mixture. From the view point of power loss and installation space, the new DCS that uses the DCHE with a common plate-type heat exchanger is more advantageous than the conventional systems using similar plate-type heat exchanger.

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