AIVC - Air Infiltration and Ventilation Centre

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The effect of temperature and air velocity change on human sensation

This report is a part of a study to search whether comfort conditions can be attained by localairflow. In the present experiment, local airflow was directed to two locations of subjectsbody and its effect was examined on which location percepts the airflow more strongly,responds physiologically more sensitively and feels more comfortable. The laboratory airtemperature was set in a range of 26-28C. This experiment was held in summer seasons atToyohashi, Japan.

Significance of humidity and temperature on skin and upper airway symptoms

The aim of that study was to assess the impact in an office environment of absolute and relative humidity, temperature and humidification on workers' skin and upper airway symptoms (such as nasal or pharyngeal dryness, eyes problems, congestion). Physical factors associated with symptoms and perceptions were appraised with logistic regression models.

Thermal diary-records of temperature exposures during a 24-h period

This paper documents people’s comfort during a 24-h period of typical daily life, immediately followed by a standard climate chamber experiment. The objective of this study is to determine the influence of outdoor weather, expectation, adaptive behaviours

Ventilation in dutch houses, a study in a representative sample of the dutch housing stock

The goal of this study was the determination of the existing situation in houses with regard to air quality and energy used for ventilation in relation to the health of inhabitants. For the energy policy the Government is considering increased energy requirements for dwellings. They are permanently opposed in doing so by people who are concerned about negative health effect due to increased requirements on for instance air tightness of buildings. To have at least a reference point, they are interested in the existing situation.

Mold in dwellings : field studies in a moderate climate

Mold in dwellings is a persisting complaint in moderate climates. Nine parameters intervene in it: (1) climate, (2) inside temperature, (3) vapor release, (4) ventilation, (5) lay out, (6) envelope thermal performance, (7) sorption inside, (8) presence of preferential condensation surfaces and (9) type of finish. Exterior climate acts as boundary condition while inside temperature, vapor release and ventilation belong to the living habits. The five others are design and construction related.

Hygrothermal behaviour of a humidity controlled air inlet

This paper deals with the real behavior of a humidity controlled air inlet, regarding to relative humidity and temperature. It has been often heard, that relative humidity is not the best indicator for detecting a need of ventilation in main rooms (living room and bedrooms) because it is season dependant (the absolute humidity outside varies in a wide range from winter to summer, which should lead the air inlet to be closed in winter and open in summer).

TRNFLOW, a new tool for the modelling of heat, air and pollutant transport in building within TRNSYS

Modelling of buildings with natural or hybrid ventilation systems requires the coupling of a thermal and an air flow model because of the strong mutual impact of the thermal and the air flow behaviour. The newly developed tool TRNFlow is the complete integration of the multizone air flow and pollutant transport model COMIS [Dorer 2001] into the thermal multizone building module of the building and system simulation program TRNSYS [Klein 2000]. An internal solver algorithm using

SIM_zonal : a software to evaluate the risk of discomfort : coupling with an energy engine, comparison with CFD codes and experimental measurements

The software Sim_Zonal is a tool for evaluating indoor temperature and air flow distributions for residential and office buildings. The aim of this EDF (Electricity of France) software developed in collaboration with LEPTAB (University of La Rochelle) is to evaluate comfort problems and specifically risks of discomfort (risk of draught, indoor gradient temperature, etc..) with taking

Combined thermal measurement and simulation for the detailed analysis of four occupied low-energy buildings

This paper describes four simulation models, which reproduce energy and temperature measurements of occupied buildings very well. These buildings represent small to medium size residential low-energy buildings of different construction type, which are typical for mid-Europe. For the simulation, the software TRNSYS is used. The reproduction of measured energy and temperatures in time steps of 15 minutes is well suited for precise predictions on heating energy demand and comfort of the buildings and modifications of them.

Breathing freely in schools - results and model approaches concerning the air quality in classrooms (In German)

Carbon dioxide concentration, indoor air temperature and relative air humidity are studied in 7 schools with natural ventilation systems, during 58 days on one year. The results show that the level of 1500 ppm of CO2 is exceeded in 39 days. A software programme was developed to calculate the CO2 concentration level according to the number of pupils and the ventilation rate.
Health problems may result from a too low ventilation rate.