Study on the Evaluation of Cross Ventilation Performance Considering Distribution of Indoor Airflow Velocity

Abstract

The distribution of indoor airflow velocity by cross ventilation is influenced by the regional climate conditions, and the location as well as the shape of the building. In this study, CVDHI B , CVDHI P and CVDHI T of Cross Ventilation Degree (1) The ratio of averaged CVDHI P and CVDHI B values is about 1: 20 in Tokyo and Niigata.(2) The CVDHI values increases when an opening is placed on an opposite wall in a straight line, and placed at the corner of the room.Prof.,

Regional classification maps for engineered natural ventilation design of office buildings in Japan

“…Predicted percentage of dissatisfied weighted criteria are proposed in EN 15251, 11,12 as well as the “percentage outside the range” and “degree hours criteria” indexes, for long‐term evaluation of the general thermal comfort conditions. Other indexes based on the idea of degree hours were proposed; cross ventilation degree hours of outside area (CVDHO), 13 and cross ventilation degree hours of inside area (CVDHI) as the expanded index with a consideration of indoor air velocity distribution 14 mainly targeting detached house while our study targets office buildings. The visualization methodology is also useful to understand the natural ventilation effects.…”