Research and Development of Packaged Air-conditioners Intended to Improve Annual Efficiency

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  • パッケージエアコンディショナの年間効率向上を目指した研究開発
  • パッケージエアコンディショナの年間効率向上を目指した研究開発(第1報)パッケージエアコンディショナの開発
  • パッケージエアコンディショナ ノ ネンカン コウリツ コウジョウ オ メザシタ ケンキュウ カイハツ(ダイ1ポウ)パッケージエアコンディショナ ノ カイハツ
  • －第1 報：パッケージエアコンディショナの開発－
  • －1st Report: Design of Packaged Air-conditioner

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We propose a packaged air-conditioner that improves the annual efficiency by 50% compared with that of the conventional one. To achieve this aim, we developed (i) a highly efficient wide-range compressor that improves the heat pump efficiency in the case of 30-40% air-conditioning loads, (ii) a heat exchanger that is optimized for both a vapor compression refrigeration system and refrigerant natural circulation system, (iii) an adaptive controller that suppresses unnecessary start-and-stop compressor operation, and (iv) a refrigerant natural circulation system that enables highly efficient operation under a low ambient temperature condition. We evaluated the annual efficiency of the developed system and proved that it is 1.52 times more efficient compared with that of the conventional one in simulation studies.

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