Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan
Online ISSN : 2424-0486
Print ISSN : 0385-275X
ISSN-L : 0385-275X
Volume 44, Issue 272
Displaying 1-3 of 3 articles from this issue
Scientific Paper
  • Part 1-Application to Fault Detection for Energy Consumption of Lighting
    Takuya TANAKA, Masaya OKUMIYA, Hideki TANAKA, Makiko UKAI
    2019 Volume 44 Issue 272 Pages 1-8
    Published: November 05, 2019
    Released on J-STAGE: November 05, 2020
    JOURNAL FREE ACCESS

    This study investigates a the mechanical detection method based on pattern analysis to understand the operation situation of a building and detect equipment faults and improper operation for utilizing BEMS data to energy management. First, the mechanism of the proposed method generates consumption patterns automatically from operation data using clustering analysis. Next, test data are classified into similar patterns and detected as anomalies based on the distance. The lighting power consumption data of an office were used for detection, and the detection accuracy was compared and evaluated when using only power consumption and when using indoor illuminance, outdoor solar radiation, and occupancy information as auxiliary data. Moreover, a simplified method for removal of anomaly data from training data in clustering was proposed, and its effectiveness was confirmed from a verification using real operation data.

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  • Minehiko SATO, Noriaki OKAMURA, Masao MASUDA, Takaomi KOBAYASHI
    2019 Volume 44 Issue 272 Pages 9-15
    Published: November 05, 2019
    Released on J-STAGE: November 05, 2020
    JOURNAL FREE ACCESS

    Direct ozone supply to the activated sludge tank was examined to improve the treatment performance of the activated sludge method. To verify the relationship between the amount of ozone supply and the treatment performance improvement effect of the activated sludge, a batch test for supplying ozone to the activated sludge was carried out. To demonstrate the improvement effect when applied to industrial wastewater, ozone was directly supplied to the activated sludge tanks of a food factory and a pulp factory. It was found of that supplying ozone directly to the activated sludge tank increased the amount of processable water improved the sludge sedimentation properties, and reduced the amount of excess sludge generated. These results strongly suggest that directly supplying ozone to activated sludge is an effective solution to solving several problems in sludge sedimentation including sludge excess amount of sludge formation in the activated sludge method.

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Technical Paper
  • Part 1-Overview of the Control Method and Verification for Single Input / Output VAV System
    Yohei OGAWA, Yasuyuki SHIRAISHI, Harutoshi OGAI
    2019 Volume 44 Issue 272 Pages 17-23
    Published: November 05, 2019
    Released on J-STAGE: November 05, 2020
    JOURNAL FREE ACCESS

    In recent years, the energy consumption of office buildings has been increasing. In particular, HVAC systems account for a high proportion of the total energy consumption. One factor that increases the energy consumption is the control problem. Therefore, this study aimed to show the effectiveness of model predictive control (MPC) as a new control method to replace classical control. In this paper, we outlined MPC and presented case studies on various control methods using MPC for a VAV system based on an air conditioning system simulation tool of the coupled simulation of CFD analysis integrating a general-purpose control simulator. It was found that MPC improves control performance because the overshoots at the rising time of air conditioning was suppressed compared to PID control. As a result, the effectiveness of MPC in air conditioning were control was shown by maintaining the working space at a set temperature using the HVAC system performance simulator with MPC.

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