AIVC - Air Infiltration and Ventilation Centre

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thermal comfort

Ventilation, air hygiene and animal health.

The objectives of a ventilation system are to provide an aerial environment in which 1, animals' health and productivity can be maintained, 2, the stockman's comfort and health needs are satisfied, and 3, the building and equipment are protected from damage. Criteria for evaluating ventilation include: thecontrol of air temperature and air speed at animal height, the control of relative humidity and prevention of condensation, and the maintenance of tolerable concentrations of gases, dust, and airborne microorganisms.

A simplified model of thermal comfort.

The principal environmental factors that affect human comfort are air temperature, mean radiant temperature, humidity and air speed. Presents asimplified model of thermal comfort based on the original work of Fanger, whorelated thermal comfort to total thermal stress on the body. The simplified solutions allow the calculations of predicted mean vote (PMV) and effective temperature which (in the comfort zone) are linear in the air temperature and mean radiant temperature, and quadratic in the dew point, and which can be calculated without any iteration.

Occupant behaviour with respect to ventilation. Final Report. Comportement energetique des usagers en matiere d'aeration. Rapport final.

Discusses reasons behind occupant ventilating behaviour, such as: 1. general attitudes, particularly regarding energy, 2. occupant requirements, 3. components of the habitat micro-climate, 4. optimum micro-climate and desired micro-climate, 5. means available in the habitat to modify the micro-climate - a. general means, b. ventilation as a specific means, 6. balancing requirements against means, 7.

Survey of occupants in dwellings with an air heating and ventilation system. Bewonersonderzoek in woningen voorzien van een luchtverwarmings- enventilatiesysteem.

50 occupants of terraced houses, divided into 4 groups, were surveyed three times in October 1981, February 1983 and March 1983. The first group had Isolair air heating and ventilating systems, and were well insulated with double glazing. The second group was heated by radiators and had the same insulation as group 1. Groups 3 and 4 had normal insulation. Results of the surveys are given. The air heating and ventilating system did not provide the level of satisfaction hoped for. The group with the air heating and ventilating system was surveyed again in March 1984.

Window-opening behaviour in office buildings

In countries such as the United Kingdom that possess a temperate climate, the majority of buildings are not air-conditioned but depend upon natural ventilation and relatively simple heating systems. Openable windows are used to reduce the in

A systems approach to the monitoring of indoor air pollutants

Building design and building construction technology has improved in the past decade and the concern over indoor air pollutants and their health effects has increased. A multi-point, multi-pollutant air sampling and analysis network was insta

Energy performance standards regarding air infiltration of buildings in Switzerland.

The Swiss performance standard for energy conservation in buildings SIA 380/1 is explained. This standard leaves air infiltration and other detail decisions to planners if minimum performance levels are met. Calculation procedures for heat balances based on a standard occupancy are described. Tools to achieve optimum space heating and ventilation rates are explained. Instrumentation for checking the thermal performance of the house in operation is defined.

First-phase occupant reaction to well-sealed indoor environments.

Possible health effects and changes in sensation of comfort among tenants after replacement of single glass windows in leaky frames with double glass windows in airtight frames have been studied. The study design was observational, and included a study group and a corresponding control group. The results indicate essential improvements of the indoor climate and of the health status of the tenants after replacement of the windows (i.e.

Predicting thermal comfort of people in naturally ventilated buildings

Describes a new procedure for predicting the thermal comfort of people in naturally ventilated buildings. The procedure starts by obtaining, for each important wind direction, velocity ratios between points of interest inside the proposed bu

Comfortable conditions - a target for climatic research workers.

Describes the work of the Department of Climate and Building Services of the National Swedish Institute for Building Research. Full scale trials, field measurement and measurement technology and methods applied to indoor climate are described. Research on airtight buildings, radon, air quality and efficient ventilation, occupant requirements and effects on human performance is also summarised. Dummies are used to measure heat transport to or from parts of the body, and for measurement of humidity.