Study of an ejector refrigeration cycle with low environmental load refrigerants, driven by solar heat and low-temperature waste heat

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14573
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 31020:Earth resource engineering, Energy sciences-related
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: Kuniyoshi Nao 東京海洋大学, 学術研究院, 助教 (00781577)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: エジェクタ冷凍機 / 熱利用 / R1224yd(Z) / R1336mzz(Z) / 数値シミュレーション / 多孔壁キャビティ

Outline of Final Research Achievements

This study experimentally investigated the performance difference between an ejector refrigeration cycle with R1224yd(Z) and R1336mzz(Z). The same ejector was used in the experiments with R1224yd(Z) and R1336mzz(Z). As a result, it is confirmed that COPT, cooling capacity divided by heat input, for R1224yd(Z) is larger than that for R1336mzz(Z). On the other hand, it was clear that the critical condensing temperature for R1336mzz(Z) is higher than that for R1224yd(Z). In addition, the effect of combining a porous cavity with an ejector on the critical condensing temperature was numerically investigated. As a result, it was confirmed that the possibility of improving the critical condensing temperature.

Free Research Field

熱工学，流体工学

Academic Significance and Societal Importance of the Research Achievements

60 ℃程度の低温熱源を利用した熱駆動型冷凍機による冷房供給ができれば，冷房による消費電力の削減が期待できる．そこで，本研究では熱駆動型冷凍機の1つであるエジェクタ冷凍機に着目した．本研究では，低環境負荷冷媒であるR1224yd(Z)およびR1336mzz(Z)を用いたエジェクタ冷凍機の実験による性能評価を行った．また，多孔壁キャビティとエジェクタを組み合わせた場合の効果について数値シミュレーションにより検証した．これらの結果はエジェクタ冷凍機の開発に貢献するものである．