English

A methodology for studying HVAC filter loading and subsequent microorganism removal is presented in this paper. First, the test facility used to challenge the filter media is discussed, then nine loading tests have been conducted , three for each of the three viruses, for the validation of the facility. Finally the results and conclusions are presented.

The aim of that experimental and modelling study is to determine the impact of different ventilation strategies on indoor particle concentration. For that experiment, polydispersed polyamide powders have been injected in a cubic test-room equipped with a mechanical ventilation system. Then experimental conditions have been simulated in a three dimensional numerical model. The results of the simulation have been compared with the experimental ones and it appears that the particle behaviour is well predicted.

For that study, a cross-sectional questionnaire survey was made : It concerned 2031 occupants of 11 naturally ventilated and 11 mechanically ventilated office buildings.The results of that questionnaire showed a strong need for improving IAQ, thermal comfort and reducing noise in open-plan offices. It appears that jobs that need a high degree of concentration or individual effort may not be suited for those open spaces.

Suppliers of heating, venting and air-conditioning products have leant on metalforming technology to pump out products that perform at higher levels of energy efficiency. In this paper three recent successes are presented of the leaders in that field :TRANE, RHEEM and YORK companies .

This paper focuses on the relations between ventiliation systems, indoor air quality and energy consumption. Several strategies are pointed out by which at the same level of energy consumption, the indoor air quality is improved or at the same level of indoor air quality, the energy consumption is reduced. Thus proper ventilation methods are important for the total energy efficiency of buildings.

For that study , an indoor contaminant behavior prediction method has been developed. The contaminant model has been integrated within the whole building simulation environment ESP-r, then validation studies were conducted. In this paper the authors insist on the importance to have a global look at contaminant behaviour, errors could occur if spatial and temporal temperature variations were not included in the prediction of contaminant levels.

In this paper the performance of a computer simulation code for modeling direct evaporative cooling by water spray vaporization is evaluated. A series of parametric explorations have demonstrated that the one-dimenstional model of spray (fluid dynamics and heat and mass transfer) is sufficiently consistent.

This paper sums up how to use CO2-Based DCV with standard 62.1-2004 from a theoretical standpoint. Changes to the way ventilation rates are calculated in the latest version of standard 62.1 require a modification to the way C02 concentration is used in DCV control system . A CO2-DCV approach for single zone systems is discussed in detail.

This paper advises the use of Standard 62 IAQ procedure to calculate the required outside air with air-cleaning systems to clean gasses, vapors and to improve the removal of particulates. That use allows a saving of energy, improves environment and makes easier the maintenance.

A high school of The Blue Valley School District located in Kansas city had a history of complaints about poor IAQ that was not conducive to learning. A study was carried out to provide a superior IAQ and to reduce annual utility costs. A new displacement ventilation system has replaced the traditional mixing one, a new boiler plant has created a higher seasonal efficiency. The results are quite satisfactory.