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Seishi OKADA, Nobuharu MAEDA, Keita FUKUI2024 Volume 49 Issue 323 Pages 1-9
Published: February 05, 2024
Released on J-STAGE: January 20, 2024
JOURNAL FREE ACCESSLegionella species is attracting attention regarding the water quality of public baths. Water quality control standards determine the type and amount of filtration treatment a public bath requires, considering the KMnO4 consumption, TOC concentration, and turbidity of the water, polluted as a consequence of bathing behavior due to numerous people using the public bathtub. Accordingly, the basic unit of pollution in the literature is considered in the paper for physicochemical evaluation, and the degree of contamination of bathtub water is predicted. This paper clarified the degree of water pollution based on the number of bathers and bathing activities.
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Kazunobu SAGARA, Haruna YAMASAWA, Takeshi IWATA, Toshio YAMANAKA2024 Volume 49 Issue 323 Pages 31-39
Published: February 05, 2024
Released on J-STAGE: January 20, 2024
JOURNAL FREE ACCESSThermal energy storage air-conditioning systems continue to be introduced in many buildings in response to Demand Response and Business Continuity Planning. In this study, a method of evaluating the storage performance for vertical inflow diffusers installed in temperature-stratified water thermal energy storage tanks was investigated, and a new relationship between the model parameters and various design conditions for the diffuser and storage tank was established. Additionally, several models of water intake for the vertical inflow diffuser were studied by CFD analysis and experiments in order to estimate the storage performance of charge and discharge cycles under a constant flow rate and constant storage temperature.
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