Pub Date : 2021-02-26DOI: 10.1109/CPEEE51686.2021.9383354
Ji Yunzhe, Lin Jintian, Wang Xiaojie
In the room with pollution source, the pollutant discharge efficiency of ventilation system reflects its pollutant discharge capacity, which is determined by the air distribution and the characteristics of pollution source. In this paper, with a ward model was established, CFD technology was used to simulate the concentration distribution of pollutant in the room as the pollution source was in different positions then these concentration distributions of pollutant in the room were taken as initial conditions, the decaying process of pollutant concentration indoor after pollution sources stopped releasing was simulated too. Base on the simulated results, the distribution and the change in the decaying process of relative pollutant discharge efficiency of each point indoor under different conditions was compared. Based on the comparative analysis of the simulation results, the pollution source index was defined, which could be used to evaluate the impact of pollution sources on the discharge efficiency. With this index, the combination of pollution source and air distribution was further discussed to improve the discharge efficiency of ventilation system.
{"title":"Research on Ventilation System Discharge Capacity Evaluation Based on CFD Simulation","authors":"Ji Yunzhe, Lin Jintian, Wang Xiaojie","doi":"10.1109/CPEEE51686.2021.9383354","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383354","url":null,"abstract":"In the room with pollution source, the pollutant discharge efficiency of ventilation system reflects its pollutant discharge capacity, which is determined by the air distribution and the characteristics of pollution source. In this paper, with a ward model was established, CFD technology was used to simulate the concentration distribution of pollutant in the room as the pollution source was in different positions then these concentration distributions of pollutant in the room were taken as initial conditions, the decaying process of pollutant concentration indoor after pollution sources stopped releasing was simulated too. Base on the simulated results, the distribution and the change in the decaying process of relative pollutant discharge efficiency of each point indoor under different conditions was compared. Based on the comparative analysis of the simulation results, the pollution source index was defined, which could be used to evaluate the impact of pollution sources on the discharge efficiency. With this index, the combination of pollution source and air distribution was further discussed to improve the discharge efficiency of ventilation system.","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127518195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-26DOI: 10.1109/CPEEE51686.2021.9383395
Hiroto Endo, M. Deng
In recent years, energy saving and reducing CO2 are requested. Therefore thermoelectric generation is noticed. Thermoelectric is a generation technology which generates electricity due to the seebeck effect when temperature difference is given to thermoelectric element. A objective of this paper is to follow electric power to reference input with operator theory and sliding mode control(SMC). Also, SMC is compared proportional-integral(PI) control on simulation. As a result, when a DC-DC converter is controlled by SMC, time to converge on reference input is shorter than when it is controlled by PI control.
{"title":"Electric power control of thermoelectric generation system","authors":"Hiroto Endo, M. Deng","doi":"10.1109/CPEEE51686.2021.9383395","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383395","url":null,"abstract":"In recent years, energy saving and reducing CO2 are requested. Therefore thermoelectric generation is noticed. Thermoelectric is a generation technology which generates electricity due to the seebeck effect when temperature difference is given to thermoelectric element. A objective of this paper is to follow electric power to reference input with operator theory and sliding mode control(SMC). Also, SMC is compared proportional-integral(PI) control on simulation. As a result, when a DC-DC converter is controlled by SMC, time to converge on reference input is shorter than when it is controlled by PI control.","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123661118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-26DOI: 10.1109/CPEEE51686.2021.9383403
Lin Jintian, Ji Yunzhe, Ma Xibin, Wang Bo, Liao Weihua
It need fast and deficient calculation method for heat transfer in the underground engineering. Most foreign researchers give the simplified calculation formulas for heat transfer in the attached shallow underground engineering envelope. These formulas ignore the heat transfer of the enclosure to the surrounding rock and soil, and if applied to the deep additional underground engineering or the single-building shallow underground engineering, it will cause a certain amount of error. Improved research of simplified calculation method for heat transfer in the underground engineering envelope were based on shape factor and phase difference in this thesis, and the attached and the single-building underground engineering envelope for heat transfer were separated. And through comparative analysis of practical example and existing literature, it proves that the method can be applied to rapid calculation in engineering.
{"title":"Improved research of simplified calculation method for heat transfer in the underground engineering envelope","authors":"Lin Jintian, Ji Yunzhe, Ma Xibin, Wang Bo, Liao Weihua","doi":"10.1109/CPEEE51686.2021.9383403","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383403","url":null,"abstract":"It need fast and deficient calculation method for heat transfer in the underground engineering. Most foreign researchers give the simplified calculation formulas for heat transfer in the attached shallow underground engineering envelope. These formulas ignore the heat transfer of the enclosure to the surrounding rock and soil, and if applied to the deep additional underground engineering or the single-building shallow underground engineering, it will cause a certain amount of error. Improved research of simplified calculation method for heat transfer in the underground engineering envelope were based on shape factor and phase difference in this thesis, and the attached and the single-building underground engineering envelope for heat transfer were separated. And through comparative analysis of practical example and existing literature, it proves that the method can be applied to rapid calculation in engineering.","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124331898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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