Dynamic Simulation of Absorption Chiller with Variable Water Volume Control

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  • FUJII Tatsuo
    Mechanical Engineering Research Center, Hitachi Research Laboratory, Hitachi, Ltd.
  • NAGANO Katsunori
    Graduate School of Engineering, Hokkaido University

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  • 冷水・冷却水変流量制御時における吸収式冷凍機の動特性解析
  • ヒヤミズ ・ レイキャクスイ ヘンリュウリョウ セイギョジ ニ オケル キュウシュウシキ レイトウキ ノ ドウトクセイ カイセキ

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Abstract

In the field of the central air-conditioning systems, variable water volume control (VWV) has been brought to attention to reduce the electricity consumed by water pumps, as well as to improve component performances. In the VWV of chilled water and cooling water passed through absorption chillers, what is important is the compatibility of energy saving and reliable operation while also controlling water flow rate and heat input. We dynamically simulated an absorption chiller to investigate this system. This chiller both calculates and transmits the controlled flow rate of chilled water and cooling water. Heat input control is simulated for both continuous and three position control. As the simulation result with assumption of cooling load profile, the estimated electricity reduction ratio is approximately 70% for the chilled water pump and 60% for the cooling water pump compared to the case of constant water volume system. On the other hand, cooling efficiency, defined as accumulated cooling calorie per accumulated heat input, is 99.5% of the constant water volume system, for continuous control. To improve the reliability of the operation, output temperature of chilled water is kept at 7±2°C in both continuous and three position controls.

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