Motoaki Utamura

TL;DR: In this paper, a supercritical CO2 closed regenerative Brayton cycle has been successfully demonstrated using a bench scale test facility, where a set of a centrifugal compressor and a radial inflow turbine of finger top size is driven by a synchronous motor/generator controlled using a high-speed inverter.

TL;DR: In this paper, a sunlight collecting system and a solar energy utilization system which collects sunlight with the sunlight collection system are provided, a sunlight collector including a solar heat collector which includes a heat collecting element which is formed by a helically wound heat exchange medium circulation pipe inside which the Heat exchange medium flows, in such a way to have an incurved light receiving surface which narrows and converges towards the sunlight inlet and a sunlight-collecting reflector.

TL;DR: Using 3D-CFD code, Nusselt number correlations for a microchannel heat exchanger (MCHE) with S-shaped fins used for hot water suppliers are obtained through numerical experiments and then validated as discussed by the authors.

TL;DR: In this paper, the authors investigated the cycle characteristics of closed gas turbines using supercritical carbon dioxide as a working fluid and found that an anomalous behavior of the physical properties of CO 2 at the pseudocritical point may limit the heat exchange rate of a regenerative heat exchanger.

TL;DR: In this paper, the performance of a closed cycle gas turbine with supercritical carbon dioxide as a working fluid was evaluated using a reduced scale turbomachine and the aerodynamic characteristics of a compressor were examined.