Computational fluid dynamics (CFD), as the most sophisticated airflow modelling method, can simultaneously predict airflow, heat transfer and contaminant transportation in and around buildings. This paper introduces the roles of CFD in building design, demonstrating its typical application in designing a thermallyconformable, healthy and energy-efficient building. The paper discusses the primar...

Abstract: The purpose of this study is to determine the effects of evaporation and condensation on the underfloor space of Japanese detached houses. In this underfloor space, natural ventilation is applied. A typical Japanese wooden detached house is raised 0.3–0.5 m over an underfloor space made of concrete. The bottom of the underfloor space is usually paved with concrete, and the ceiling whi...

Respiratory diseases such as COVID-19 can be spread through airborne transmission, which is highly dependent on the airflow pattern of studied room. Indoor air typically not perfectly mixed even using a mixing ventilation, especially in large spaces. Airflow patterns open spaces hotel banquet rooms and plan offices, are particular concern, these usually accommodate more occupants thus have pote...

The indoor air quality in an operating theatre affects both patient health and the well-being of the surgical team members. Health care facilities, and operating theatres in particular, require ventilation and air conditioning for thermal comfort and removal of contaminants. Although the patient undergoing surgery is given the highest priority, it is important to consider the comfort of surgica...

In detailled buiding simulation models, airflow modelling and solving are still open and crucial problems, specially in the case of open buildings as encountered in tropical climates. As a consequence, wind speed conditioning indoor thermal comfort or energy needs in case of air conditionning are uneasy to predict. A first part of the problem is the lack of reliable and usable large opening ele...

We consider chemical plume tracing (CPT) in time-varying airflow environments using multiple mobile robots. The purpose of CPT is to approach a gas source with a previously unknown location in a given area. Therefore, the CPT could be considered as a dynamic optimization problem in continuous domains. The traditional ant colony optimization (ACO) algorithm has been successfully used for combina...

Bedside curtains are widely used in multi-bed wards to protect the privacy of patients. However, it may change distribution airflow and lead cross infection. A numerical approach is applied investigate contaminant a two-bed ward with downward ventilation. Tracer gas such as CO 2 simulate exhaled contaminants by two lying The concentration distributions without bedside compared. results show tha...

This paper addresses the collective odor source localization (OSL) problem in a time-varying airflow environment using mobile robots. A novel OSL methodology which combines odor-source probability estimation and multiple robots' search is proposed. The estimation phase consists of two steps: firstly, the separate probability-distribution map of odor source is estimated via Bayesian rules and fu...

Maintaining contact between the robot and plume is significant in chemical plume tracing (CPT). In the time immediately following the loss of chemical detection during the process of CPT, Track-Out activities bias the robot heading relative to the upwind direction, expecting to rapidly re-contact the plume. To determine the bias angle used in the Track-Out activity, we propose an online instanc...

Door closers are widely used for doors in commercial buildings, not only for safety purposes but also for reducing the airflow through door openings. This study aimed to develop a method for quickly assessing, in the design phase, the heating and cooling energy cost saving from using an effective door closer. The method developed in this study consists of a stop angle model, airflow model, and ...