English

International building legislation is setting stronger and stronger requirements for the energy performance of buildings. The most recent example is the Energy Performance of Buildings Directive in the European Union. The improved energy performance of buildings can't be achieved by additional insulation or more effective building systems only. A major influence factor on the energy quality is the ventilation technology and also the airtightness of the building.

An island hood, which is often installed in anisland kitchen, is an exhaust range hoodmounted on a ceiling independently. Thecapture efficiency of the island hood is obtainedby experiment and CFD analysis. Examinedparameters are heat input, exhaust airflow rate,mounting height of the hood, and withlwithout abaffle plate. The Experimental results indicatethat the effect of the baffle plate is achieved inthe case of large exhaust airflow rate or smallheat input. Results of CFD analysis are higherthan that of the experiment in the all cases.

Interzonal air movements are important tocharacterize overall ventilation perfosmance ofcomplicated multi-zone indoor spaces. Tracergas techniques are widely used to measureventilation rates or ventilation effectiveness aswell as air movements between indoor spacesusing either a single or multiple tracer gases.This paper compares the tracer gas methods interns of procedures and uncertainties inmeasuring air exchange rates between rooms.Experiments have been conducted in a simpletwo-room model with known airflow rates.

Indoor air concentration is mainly affected bythe emission rate of contaminants frommaterials and the ventilation rate. Therefore, theappropriate selection of materials andventilation rate is an important factor for indoorair quality. The purpose of this study is topropose a method for the selection of materialsand to determine an appropriate ventilation ratethat can maintain the recommended guidelineconcentration with minimum cost.

There are some ways to promote natural ventilation, but this research focuses on chimney which is traditional ventilation method used for industry or fireplace. The goal of this research is to establish the guidelines for the design of chimney for natural ventilation of rooms. This paper reports the result of the wind tunnel test to study airflow around building roof As a result of wind tunnel tests, some tendencies were obtained.

The Energy Performance of Buildings Directivementions that each member states' energyperformance (EP) calculation methodology mayinclude envelope airtightness. In fact, manymember states have included envelopeairtightness in their EP calculation method.Many countries have also specific requirementsfor ductwork airtightness. However, they seemto be unequally successful in achieving a markettransformation. This paper describes themechanisms that have been used in somecountries, with a special focus on success storieswhich could inspire other member states.

This study explores the plausible mechanismlinking outdoor air supply rates and workperformance through the perceptual responsesand a target salivary biomarker. An extendedobjective is this study is to perform comparativestudy between the healthy and the asthmaticgroups of subjects. A total of 160 young adultsparticipated as voluntary subjects in two phases.The study was conducted in the FieldEnvironmental Chamber which simulates anoffice setting. Subjects rated the air quality at18.0L/s/p to be most acceptable, followed by9.0L/s/p and the least acceptable at 4.5L/s/p(P

There are many infiltration routes in detachedhouses in Japan. These routs lead chemicalcompounds into the indoor spaces from theconcealed spaces.In this study, the effects of countermeasureswith airtight methods and ventilation methodswere cleared using a simulation program. Atfirst, the equivalent leakage areas in theconcealed spaces were measured using cutmodels. Next, the movements of chemicalcompounds were calculated using thesimulation program: "Fresh2006".The results showed that the concentrations arelower in the improved houses than those in thecommon houses in some cases.

The hygrothermal performance of houses isrecently being required to indicatequantitatively due to the encouragement ofenergy conservation. Several calculationmethods are practically proposed to evaluateenergy saving measures of houses. However,those methods do not take into account moisturetransfer in wall assemblies. Humiditycalculation is simply affected by ventilation andfocuses on just the building spaces.

Recently, a law securing 0.7ACH ventilationrates was enacted in South Korea. As aconsequence, various ventilators have beeninstalled in apartments. Of the different types ofventilators that have been installed, naturalventilators are able to minimize energyconsumption and reduce environmental load byusing natural energy.