過冷却水利用ダイナミック型氷蓄熱システムの研究

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  • Studies of a Dynamic Type Ice Storage System Using Supercooled Water
  • カレイキャク ミズリヨウ ダイナミックガタヒョウチクネツ システム ノ ケンキュウ

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An ice storage system using supercooled water for ice making sluny-ice was constructed in this research to find conditions of stable and efficient operation. The system was consisted of a storage tank with the volume of 1.5 m3, as piral double-tube heat exchanger 22 m long, cold and hot brine tanks, a heater and refrigerating machine of the rated capacity of 2.2 kW. Stability of ice making was realized by improvement of water-exit part of the heat exchanger, proper arrangement of the heater and the water pump, and use of extended region of the water path between ilie outlet of the heater and the inlet of the heat exchanger for melting ice particles in the circulating water. A method to calculate an instantaneous ice-packing factor from the measurements of temperatures of water was easy and proper. Two control methods for operating the system steadily were applied to the system. The method which controls the temperature of the supercooled water at the exit of the heat exchanger showed better performance in producing ice than the method which controls the temperature of the brine at the inlet of the heat exchanger. A COP of about 1.5 based on the power consumption of the refrigerating machine was attained.

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