• Experimental investigation of dry ice cyclone separator for ultra‐low temperature energy storage using carbon dioxide 

      Yamasaki, Haruhiko; Kizilkan, Ônder; Yamaguchi, Hiroshi; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter (Peer reviewed; Journal article, 2020)
      CO2 cascade heat pump system has been developed to realize an ultra‐low temperature below the triple point of 0.518 MPa and − 56.6°C or less by flowing dry ice solid‐gas state of CO2 in a refrigeration system. Solid CO2 ...
    • Experimental investigation of the effect of solid-gas two-phase flow in CO2 cascade refrigeration system 

      Yamasaki, Haruhiko; Yamaguchi, Hiroshi; Kizilkan, Ônder; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter (Peer reviewed; Journal article, 2020)
      The dry ice sublimation process of CO2 is a unique technique in which temperature ranges below the triple point of −56 °C can be achieved in a CO2 refrigeration system. However, during the evaporation process of the actual ...
    • Solar heat recovery system using CO2 as working fluid 

      Yamasaki, Haruhiko; Wakimoto, Hiroyuki; Yamaguchi, Hiroshi; Nekså, Petter (Science et technique du froid;, Chapter, 2020)
      This article proposes a solar water heater system induced by natural convective flow using supercritical CO2 as a working fluid. The proposed solar water heater can produce thermal energy as hot water from solar thermal ...
    • Thermal Characteristics in Supercritical CO2 Along Heating Tube 

      Tazawa, Taluya; Yoshida, S; Yamasaki, Haruhiko; Wakimoto, Hiroyuki; Yamaguchi, Hiroshi; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter (Sciences et technique du froid;2020:14, Chapter; Peer reviewed, 2020)
      The system using CO2 as a refrigerant such as heat pump or Rankine cycle, depends greatly on the phase state and physical properties of CO2. In the present study, as a basic research on CO2 in the supercritical state, an ...