成果報告書詳細
管理番号20110000000908
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/デシカント・蒸気圧縮式ハイブリッド型ノンフロストヒートポンプの研究開発
公開日2011/8/5
報告書年度2010 - 2010
委託先名東京大学 東京電力株式会社 新日本空調株式会社
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. 研究開発の内容及び成果等
本研究開発では、吸着材メソポーラスシリカを使用したデシカントサイクルと蒸気圧縮式冷凍サイクルのハイブリッドシステムにより、冬季におけるノンフロスト運転、夏季におけるノンドレイン運転を可能とするノンフロストヒートポンプを開発する。平成22年度の取組状況を表1 に示す。研究項目と平成22年度の目標と取組・成果と当初目標との差異を示す。
英文要約FY 2010 Annual report on research and development of next-generation heat pump systems
Research and development of frost-free vapor-compression heat pump systems hybridized with desiccant material
The University of Tokyo, Tokyo Electric Power Company and Shin Nippon Air Technologies
A hybrid system consisting of a heat pump and desiccant material is superior to a conventional heat pump in terms of energy efficiency for air dehumidification. This is because the humidity can be reduced by adsorption of water vapor onto the desiccant materials without lowering the temperature below the dew point, and the water vapor can subsequently be desorbed using low-temperature exhaust heat. This mechanism enables the system to offer non-drain operation in summer. Furthermore, if desiccant materials can function below the freezing point, frost-free heat pumps or freezer could be realized. These systems would not require defrosting, thus increasing their energy efficiency. The objectives of this project were to make prototypes of two different types of the hybrid heat pump systems used as water heater and air conditioner and to evaluate their energy efficiency. To achieve these objectives, the research topics have been categorized into the following four classes:
(A) Research and development of desiccant materials
(B) Design of energy-saving systems
(C) Research and development of hybrid heat pump systems
(D) Operation test & evaluation and marketing research for product commercialization
Research results in FY 2010 are as follows. (A) Two-dimensional hexagonal mesoporous silicas (MPSs) with pore diameters of ca. 3 and 10 nm were synthesized via an evaporation-induced self-assembly process, and the adsorption-desorption isotherms of water vapor were measured in the temperature range of 263-298 K. Both MPSs can adsorb water vapor without freezing even if the temperature is below 273 K. Therefore, MPSs are potentially applicable in frost-free heat pumps or freezers, which would be more energy efficient as they would not require defrosting. Furthermore, the effects of temperature and the number of measurements on the isotherm were clarified [1, 2]. The adsorption rate of water vapor was also measured by using a magnetic suspension balance at 263 K. The result showed that the time constant was in the order of 10 min, suggesting that MPSs are potentially applicable in frost-free heat pumps system. (B) The energy-saving systems of water heaters and air conditioners were designed using numerical simulation. The simulation results showed that annual performance factors (APFs) of hot water supply and air conditioner can be improved 1.3 and 1.5 times as high as those in conventional heat pump systems. (D) The target market was identified by the analysis of climate conditions and current commercial products. The energy saving effect was calculated by the analysis of energy consumption in the residential sector. Furthermore, the feasibility of proposed systems in the above mentioned target market was confirmed by interviewing house constructors and heat pump manufacturers and the guideline to determine product specifications was established.
References
1. Akira Endo, Toshio Yamaura, Fumio Matsuoka, Eiji Hihara and Hirofumi Daiguji, "Water adsorption-desorption isotherms of two-dimensional hexagonal mesoporous silica around freezing point," submitted.
2. Toshio Yamaura, Hirofumi Daiguji, Fumio Matsuoka, Eiji Hihara and Akira Endo, "Water adsorption properties of two-dimensional hexagonal mesoporous silica around freezing point," Proceedings of 48th Japan National Heat Transfer Conference (2011).
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