Analysis of airflow in a full-scale room with non-isothermal jet ventilation using PTV techniques

Lingying Zhao, Xinlei Wang, Yuanhui Zhang, Gerald L. Riskowski

Research output: Contribution to journalConference articlepeer-review

Abstract

Draft and non-uniform fresh air distribution are common problems in winter ventilation, especially for large animal buildings. Thermal-based anemometers have difficulties in accurately measuring non-isothermal and low-speed indoor airflow. A new technology, particle tracking velocimetry (PTV), which uses particles and their images to study indoor airflow, can overcome the traditional limitations in indoor airflow measurement. A PTVsystem was used to characterize indoor airflow in a full-scale ventilated room under non-isothermal ventilation conditions. Non-isothermal mild weather and winter ventilation conditions were simulated to analyze their effects on indoor airflow and air velocities in animal occupied zones and human breathing zones. It is found that winter ventilation created a totally reversed rotating airflow pattern. Air velocities in the animal occupied zone increased substantially compared with the corresponding isothermal ventilation conditions. Winter ventilation strategies for improvement of airflow distribution were studied: (1) increasing inlet air velocity, (2) increasing inlet air jet momentum by use of air recirculation devices, and (3) decreasing ventilation temperature difference.

Original languageEnglish (US)
Pages (from-to)414-425
Number of pages12
JournalASHRAE Transactions
Volume113 PART 1
StatePublished - Aug 23 2007
Event2007 Winter Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers - Dallas, TX, United States
Duration: Jan 27 2007Jan 31 2007

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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