成果報告書詳細
管理番号20110000000910
タイトル*平成22年度中間年報 次世代型ヒートポンプシステム研究開発/実負荷に合わせた年間効率向上ヒートポンプシステムの研究開発
公開日2011/7/28
報告書年度2010 - 2010
委託先名日立アプライアンス株式会社 株式会社日立製作所
プロジェクト番号P10011
部署名エネルギー対策推進部
和文要約和文要約等以下本編抜粋:1.共同研究の内容及び成果等 本研究開発の目標は、ヒートポンプシステムの年間効率を現状の1.5倍にする事である。 現状のヒートポンプは、図1に示す様に、空調能力50%付近で最高効率を示し、それ以下では低下する。しかし実際に使用される頻度は50%以下の低負荷が多い。そこで、低負荷における圧縮機効率を向上させ、かつ連続運転範囲を広げる事で、低負荷領域でのヒートポンプの効率を向上させる。加えて外気温度が低い際には冷媒自然循環方式を用い、また不要な発停ロスを防止するために適応制御を採用する。以上のシステムを開発するため、ヒートポンプシステムと高効率ワイドレンジスクロール圧縮機の開発を行う事とした。
英文要約Title: A Heat Pump System That Improves Annual Efficiency by Fitting the Actual Air-conditioning Load
To improve the annual efficiency of the conventional packaged heat pump system by 50%, we proposed a heat pump system with a highly efficiency wide-range scroll compressor. The proposed system had to satisfy the following requirements. (i) To use both a vapor compression refrigerating system and refrigerant natural-loop circulation system at low air-conditioning load. (ii) To avoid unnecessary start-and-stop compressor operation. (iii) To improve the overall adiabatic efficiency of the compressor by 20% under a low-speed condition compared with the conventional one. : The refrigerant natural-loop circulation system proved effective at saving operational energy, provided its cooling capacity is larger than the cooling load. : To avoid intermittent operation, we used adaptive control and estimated the air-conditioning load, which prevented unnecessary starts-and-stops by the compressor. In addition, we reduced the temperature difference between the air and the refrigerant by improving the heat exchanger. : The compressor proved to be effective against intermittent operation because its rated rotation speed was raised by changing the displacement volume down to 70% of that of the conventional value, applying optimizing method for improving efficiency at low speed while maintaining rated capacity. We also set its minimum speed ratio to a maximum speed lower than the conventional one (from 20% down to 3%) with the capacity control mechanism. Diamond-like carbon (DLC) coating also proved useful for increasing efficiency when we used it on the bearing of an orbiting scroll. : We used the above results to calculate the annual operating efficiency of a typical office model in Tokyo. The calculation showed that the proposed system can improve annual efficiency by 50% compared with the conventional packaged heat pump system.
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