English

For that study , three different ventilation systems for typical single family houses in the Nordic outdoor were compared in order to investigate the resulting energy use and life cycle cost for each of them.The three types of ventilation system are : exhaust ventilation, exhaust and supply ventilation with heat recovery and exhaust ventilation with heat recovery through a heat pump connected to the exhaust air.

This paper covers the cost and benefit issues of a full dual path system to all control zones, including a case study office building in Lincoln, Nebraska. The system has one path that delivers outside air to all control zones. A two-stage heat recovery system is use for the outside air path to achieve as near space neutral temperature supply air to the space at all outside air conditions. The second path is a VAV system with options for continuous running of the system to control space temperature and humidity conditions throughout the summer months.

By means of a comparative study of thermal confort methods for a Brazilian reality using among many others authors Voght and Miller Chagas, Givoni, Fanger-Ashrae, Mahoney, Humphreys, Olgyay, methods, this undergoing study tries to show their particularities for the altitude tropical climate of for the city of So Paulo Brazil. This work intends to show the applicability of each method and point out the differences of acclimatation factors for local population. This theme is particularly important in a country with big variations os latitude and macroclimates as Brazil.

This paper deals with estimated ventilation rates and symptoms in office workers. For that base study the authors used the U.S. EPA data from 100 large U.S. office buildings, and assessed relationships in multivariate models between ventilation/person and lower respiratory and mucous membrane symptoms.
Findings suggest that ventilation rates above current guidelines would reduce symptoms in office workers, and that occupant density may play an unrecognized role in ventilation requirements.

This paper sums up a detailed (CFD) study of the flow around a Computer Simulated Person (CSP) in a displacement ventilated room. The requirements of several computational aspects such as convergence criteria and grid resolution needed for accurate CFD simulations of the personal micro-environment are identified.
Two RANS turbulence models predicted different behavior in both flow structures. But without experimental data the results could not be validated.

Health and comfort performance criteria for buildings have been defined. Then compliance with a set of measurable parameters related to indoor air pollutants or physical characteristics of the indoor environment is expected to assure, with a high degree of confidence, the provision of acceptable performance of buildings
Energy efficiency is evaluated too by means of the energy index ( the yearly total energy use per gross heated floor area), and the building is ranked accordingly.

A limited number of studies on the effectiveness of prevention and remediation of IAQ problems in homes were identified. This paper is a critical review of scientific literature on residential IAQ, ventilation and building-related health effects investigations.

The performance of the ventilation system in a large welding working place was evaluated for that study. The exposure to welding fumes may be dangerous for workers, to prevent that problem , jet fans were used based on concept of total space ventilation.
It was found that the welding fumes in occupied zone were not diluted efficiently when the ventilation system was not installed whereas their concentration was maintained below the regulation limiit with the jet fans,

In this paper the concentration of CO2 is taken as an index of personnel contamination and the concentration of TVOC as an index of building contamination, which meets the needs of energy saving and indoor air quality improvement through air conditioning fresh air random control.

The paper demonstrates the application of a new index that provides a practical and quantitative evaluation of building ventilation effectiveness. It allows the judging of the ventilation performance of a displacement ventilation system in a building complex, with the contaminant concentration data obtained from numerical experiments.