English

The first part of this paper is a presentation of a simple method using commercial CFD software to obtain the solution multiplicity characteristics of laminar and turbulent indoor airflows.A two-zone naturally ventilated building with four openings is considered in that study. Nonlinear dynamic behaviors are analyzed. Different flow modes were identified with the same physical and boundary conditions. A multi-zone airflow and thermal coupled program was also used to evaluate the results.That theroretical analysis can help to properly design natural ventilation in real buildings.

The aim of that study was to evaluate the environment's thermal conditions so as to indentify the comfort and localized discomfort conditions in office buildings with underfloor air supply systems.Parameters of thermal comfort and of system operation are presented in this paper. The results of that research show that thermal conditions created by the underfloor air supply system fulfill the thermal comfort requirements and can be used as a guideline for air-conditioning systems with underfloor air supply designs.

The influence of three airflows (constant airflow, simulated natural airflow and sinusoidal airflow) on thermal comfort was studied in this paper.Their different fluctuation characteristics were used to conduct experiments on human thermal response in two different temperature environments, neutral-warm (30C) and cool-neutral (26C) environments. The method and results are presented.

From the epidemiological point of view, the main pathway to infection spread is airborne transport. The droplet size is the most important factor affecting their dispersion and deposition on surfaces, it determines the survival of microorganisms within the droplets.
This paper is a review of the state of knowledge concerning mechanisms of droplet spread and the solutions available to minimize their spreading and thus to prevent infections.

This paper discusses the impact of indoor air on people at home, at school and at the office . The methods that can provide large improvements of IAQ while saving energy are also presented. This paper estimates an enormous potential that can improve IAQ in practice by using new emerging technologies

In this paper, a method for adjusting refrigerant charge is presented. it uses a charge correction equation that requires data for two operating points for parameter tuning. The two-point charge tuning method leads to much better prediction for a wide range of operating conditions and regrigerant charge levels. That method has been tested for multiple units and worked well..

A new method developed for automatic detection of refrigerant leakage in distributed refrigeration system, is presented in this paper. A supermarket store in Colorado was used as a prototype for the design of the system model and the testing and evaluating of the detection and diagnostic technique. The developed techniqueis able to detect a leakagewhen the refrigeration system loses more than 1% of the initial charge.

There are notable changes in the 2006 edition of the Guidelines for design and construction of hospital and health care facilities. Those changes are the result of a multidisciplinary review of the ventilation requirements and the ventilation recommendations are based on definitive scientific basis.

In this paper, numerical simulations were performed to investigate the dispersion mechanisms of expiratory aerosols in an enclosure wtih two different types of of ventilation airflow patterns : unidirectional downward and celing return flow. Experimental results with distilled water as working fluid were compared with some of the numerical results : they were performed in a unidirectional downward flow with the geometry identical to the numerical one. A reasonable agreement was shown.

For that study, indoor/outdoor measurements have been carried out in two residential houses in Oslo. The main objective is to determine the physico-chemical properties of indoor and outdoor particulate matter (PM) associated with actual human exposure. The parameters that influence that relationship of indoor to outdoor concentration of particulate matter in residential houses are discussed in this paper.