For that study, the thermal performance of two passive cooling systems under hot and humid climate condition is experimentally investigated. The experimental results obtained from a test cell were compared to those obtained from a controlled cell with identical walls but different roof configurations. The results show that application of a solar chimney in the test cell together with the spraying of water on roof can maintain the room temperature much lower than the ambient temperature and increase the flow rate of air due to the buoyancy.

This paper reports a study based on CFD simulations of refuge floor natural ventilation induced by wind flow around a high-rise building. The simulations are validated by wind tunnel measurements. The results reveal that at all wind angles, the wind can enter the refuge space from the windward side and escape from the leeward side. At some wind angles, the wind is found to re-enter the refuge space. Based on those results, suggestions are made by the authors.

A combined system of chilled ceiling, displacement ventilation and dessicant dehumidification is presented in that paper. It is designed and applied for space conditioning in a hot and humide climate as in China. To confirm the feasibility of the combined system in that type of climate, and to evaluate its performance, a mathematical model was developed to simulate an office building in Beijing and estimates IAQ, thermal comfort and energy consumption.

In this study, a step by step process has been used for the development of deemed-to-satisfy design solutions, that cope with the energy efficiency - thermal comfort - indoor air quality dilemma (EE-TC-IAQ Dilemma), for a performance based code. A distinction is made between improving building design variables and improving ventilation schemes.

By modeling the particles deposition in ventilation ducts, the authors discuss the effect of ventilation duct as a particle filter. An Eulerian model is used to predict the particle deposition velocity from fully developed turbulent flow in ventilation duct. Two empirical equations are proposed to predict the particle deposition velocity, and to predict the particle penetration through the bends. Losses through ventilation duct are evaluated. Straight duct and duct bend cases are analyzed. The results of an application case are presented

This paper presents findings from an in-situ study on a group of minienvironments that focuses on the characterization and evaluation of their environemental performances in a clean room. The authors found that not so high pressure differentials, as required in relevant industry standards, are necessary to achieve a high level of air cleanliness to meet environmental control expectation .

A questionnaire study has been carried out to investigate the prevalence of SBS (Sick Building Syndrome) in a multistory centrally air-conditioned Airport Authority of India building in New Dehli city. The quantification of the users' perception about IAQ was done by converting their responses to a SBS score. A qualitative and quantitative analysis were then conducted. A direct relation between the average SBS score and CO2 concentration was found, clearly signifying the usefulness of SBS score in IAQ.

Parametric studies of facade designs for naturally ventilated residential buildings in Singapore were carried out in view to optimize facade designs for a better indoor thermal comfort and energy saving. Thermal comfort regression model for naturally ventilated residential buildings in Singapore was used to evaluate the various facade designs . The simulation results are presented along with the conclusions.

Detection and diagnosis of multiple faults in VAV systems using principal component analysis (PCA) and joint angle analysis (JAA) are presented in that paper. With the multiple faults separated into different locations, joint angle analysis is used to isolate the faults one by one according to corresponding local models.

For that study, a model has been developed in order to calculate indoor concentrations of PM 2.5. Nitrate, sulfate and black carbon in residences, taking into account modeled air exchange rates and outdoor concentrations measured far and close to those residences.