Measuring the transient airflow rates of the infiltration through the doorway of the cold store by using a local air velocity linear fitting method. (1st October 2018)

• Record Type: Journal Article
• Authors: Tian, Shen; Gao, Yuping; Shao, Shuangquan; Xu, Hongbo; Tian, Changqing
• Is Part Of: Applied energy. Volume 227(2018)
• Page Start: 480
• Page End: 487
• Publication Date: 2018-10-01
• Subjects: Infiltration -- Airflow rate -- Air velocity -- Cooling load -- Cold store; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2017.07.018
• Languages: English
• ISSNs: 0306-2619

Abstract

Highlights: The infiltration is responsible for more than half of the total cooling load. A direct method is developed for measuring the transient infiltration airflow rates. The method is validated by the experiments of tracer gas decay technique. The measurement errors of infiltration airflow rates are distributed between ±10%. The practical application of the proposed method is discussed. Abstract: The measurement of the infiltration airflow rates can support the calculation of the infiltration cooling load for the better understanding and optimizing the energy consumption of cold stores. However, the large temperature difference and the intense transient features make it difficult and complex to measure the airflow rates accurately. In this paper, a simple and practical method to measure the transient infiltration airflow rates is developed by using the local air velocity linear fitting. The proposed method is validated by the measurement results of the tracer gas decay method. It is concluded that the proposed method shows a good performance on the transient infiltration airflow rates measurement. The measurement errors are between ±10%. To enhance the application of this method, the layout of the measuring points of the air velocities are analyzed. The results show that, along the vertical layout direction, air velocity measuring points around the neutral level (where the cold and the warm air separate, about the middle height of the door) are not preferred when using this method. What's more, the calculation of the infiltration cooling load by using this measuring method is also discussed.