Ventilation in pumped storage power stations: Influence of dehumidifiers in an underground tunnel

Xue, Feifei; Xu, Chang; Shen, Wen Zhong; Li, Linmin

doi:10.1016/j.applthermaleng.2020.115162

Cited by 9 publications

(4 citation statements)

References 32 publications

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“…When the evaporator coil picks up heat from the incoming air, the condenser coil releases heat into the outlet air and then mixes with the air downstream of the outlet. 36 As the placement of industrial dehumidifiers can be different, the results presented here were the best results obtained by several attempts of changing the positions and directions.…”

Section: Resultsmentioning

confidence: 66%

Measuring and modeling moisture environment in underground metro stations during commissioning stage: A case study

You

Zhang

et al. 2021

Building Services Engineering Research and Technology

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Due to the humid underground environment, underground metro stations often have internal condensation issues, especially during the commissioning and initial operation phases, and these issues will have a negative impact on the equipment operation and building life. This study aims to solve the issue by 1) identifying common areas with condensation risks based on on-site measurements and numerical simulation methods, and 2) proposing effective dehumidification solutions for the moisture control of stations. By on-site investigating the characteristics of the station’s moisture environment and numerical assessing the effects of two different dehumidification strategies, it has been found that 1) for Tianjin, during most times in summer, the air temperature of the station in the commissioning phase was maintained relatively stable, but with significantly changing humidity; 2) the relative humidity on the platforms was higher than 80% for almost 30% of the testing time, and the surface of the upper structure of platform doors having a high risk of condensation; 3) the dehumidification effect of industrial dehumidifiers was found to be better than that of increasing exhaust air volume. The authors hope that the research could aid the decision on dehumidification strategies and provide guidance for further moisture control in underground stations. Practical Application This article analyzed the moisture environment of the underground metro stations in the commissioning phase and conducted a numerical approach to assess the condensation risk. Potential dehumidification solutions including increasing the exhaust air volume and using industrial dehumidifiers have been proposed, and their effects have been investigated and compared. The authors hope that this research can aid the decision on dehumidification strategies for facilities maintenance and provide a guidance to further moisture control in underground stations.

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Section: Resultsmentioning

confidence: 66%

Measuring and modeling moisture environment in underground metro stations during commissioning stage: A case study

You

Zhang

et al. 2021

Building Services Engineering Research and Technology

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“…Sci. 2022, 12, 4896 6 of 14 (4) According to the absolute weight, the relative weight of the assessment index λ j is calculated by Equation (7).…”

Section: C-owa Operatormentioning

confidence: 99%

“…It not only has a flexible storage capacity which could support the deployment of wind and solar energy, but also helps to ensure the secure and stable operation of power grid [3,4]. In 2016, the signing of the "Paris Agreement" resulted in a quick development of green and low-carbon energy [5].…”

Section: Introductionmentioning

confidence: 99%

Suitability Evaluation of the Lining Form Based on Combination Weighting–Set Pair Analysis

et al. 2022

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Aiming at the many uncertain factors in the suitability evaluation of reinforced concrete lining of high-pressure pipelines, the set pair analysis (SPA) theory is used to establish the suitability evaluation model. By summarizing the key influencing factors of typical lining design criteria, five suitability evaluation indices are determined from three criteria, i.e., the minimum overburden criterion, the minimum principal stress criterion, and the hydraulic fracturing criterion. In order to fully consider the subjective and objective factors, the combination ordered weighted averaging (C-OWA) operator and the criteria importance through intercriteria correlation (CRITIC)-entropy weighting model (EWM) were used to construct a combination weighting method, and the weight coefficients of each index were comprehensively determined. Based on the SPA theory and calculation rules, combined with the lining suitability grading criteria, the five-element connection degree of each index and the comprehensive connection degree of each working point were calculated. In this study, the model is applied to the suitability evaluation of reinforced concrete lining at each drilling point of the high-pressure pipeline of a pumped storage power station (PSPS) in Shanxi Province. The results show that the proposed model consisting of subjective weight and objective weight can effectively avoid the error caused by a single weight method, which improves the evaluation sensitivity and rationality.

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“…In order to analyze the flow and heat transfer in the tunnel, Xue et al [3] proposed a new temperature prediction model to predict the temperature distribution * Corresponding author: lijunmei@bjut.edu.cn in the tunnel with or without dehumidifiers. It is worth noting that the current research on the thermal and humid environment of underground pumped storage power plants is more experimental and lacks simulation studies.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Moisture Dissipation on the Thermal and Humidity Environment in the Turbine Floor of Underground Pumped Storage Hydropower Plants

et al. 2022

E3S Web Conf.

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The turbine floor of the main plant is an important part in an underground pumped storage hydropower plants.The health of personnel and the safe operation of equipment are endangered due to high space humidity and water seepage through the walls. In this paper, numerical simulations were used to study the thermal and humidity environment of the main plant turbine floor in summer. Two working conditions with and without the dissipation of humidity are computed and compared. The psychrometric chart was also used to analyze the air treatment process in the turbine floor. Results show that the air temperature decreases by 28% and the relative humidity increases by 34% when considering the effect of the moisture dissipation source. The results of temperature and humidity analyzed by the psychrometric chart are similar to those of numerical simulation. And validition of the numerical method is conducted . The research results have a reference significance for predicting the relative humidity distribution of the turbine floor and the arrangement of dehumidification devices at design stage .

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Ventilation in pumped storage power stations: Influence of dehumidifiers in an underground tunnel

Cited by 9 publications

References 32 publications

Measuring and modeling moisture environment in underground metro stations during commissioning stage: A case study

Measuring and modeling moisture environment in underground metro stations during commissioning stage: A case study

Suitability Evaluation of the Lining Form Based on Combination Weighting–Set Pair Analysis

Study on the Influence of Moisture Dissipation on the Thermal and Humidity Environment in the Turbine Floor of Underground Pumped Storage Hydropower Plants

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