マルチソース•マルチユース•ヒートポンプシステムに関する技術開発: 第2報-水熱源空調ヒートポンプの開発と性能検証

摘要

We proposed a multisource and multi-use heat pump (MMHP) system that attains a higher coefficient of performance (COP) than conventional heat pumps. The MMHP system extracts thermal energy from multiple heat sources/sinks such as solar heat, ground, and air and provides it to multiple heat uses such as cooling, heating, and hot-water supply with a water loop. Each use side can be expected to achieve high efficiency. Although there are many water-source heat pumps for air conditioning, these existing heat pumps are not suitable for the water-source temperature range of this system. Therefore, we developed a water-source heat pump that is suitable for this system for air conditioning. The development of the water-source heat pump combined with air conditioners is presented in this paper. A prototype of the water-source heat pump is developed, and good performance is achieved by adjusting the control of the expansion valve. The COPs of the cooling and heating modes were 10.1-14.2 and 4.8-5.1, respectively. On the basis of the experimental results, a performance curve of the prototype was created, which can be used for simulations.%筆者らは建物の大幅な省エネルギー化を目指し，熱利用機器の熱源が複合的に利用可能な『マルチソース・マルチユースヒートポンプシステム，名称MMHPシステム』を提案し，機器の大幅な性能向上を図っている。前報の給湯機に引き統き，本研究ではMMHPシステムコンセプトの熱源水温度域に合わせた水熱源空調ヒートポンプを開発するため，膨張弁開度の制御検証を実施し，機器制御の改良を行なった。その結果，本システムにおける定格出力の冷房COPは10.1～14.2を確認した。暖房COPは4.8～5.1を確認し，機器の改良方策を考案した。また，開発機の性能曲線を近似多項式で表現し，シミュレーションの実施を可能とした。