Wind speed correction based on the terraincharacteristics is commonly found in severalwind related applications in the builtenvironment. In some models based on powerlaw profile, the exponent (a) and a correctionfactor (1) are assumed for each tewain type.This paper aims to check the applicability ofone of these models for urban environmentswith high density. Experiments in a boundarylayer wind tunnel were performed for an urbanarea of 600 x 600 m, in the district of Moema,in the city of S5o Paulo, Brazil, using a modelwith 1:500 scale.

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.

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.

In predicting flow rate of a cross-ventilatedbuilding, discharge coefficients obtained fromthe connected value of resistance coefficient ofopening based on the chamber method, and thewind pressure coefficients from a sealedbuilding are usually used. This method canpredict the flow rate well for the case of smallopenings. For the large openings, however, it iswell known that flow rate could beunderestimated because these are not based onactual condition.

The purpose of this study is to clarify thecharacteristics of airflow around building roofand to provide the guidelines for design ofnatural ventilation by chimney.

Conventionally, the flow rate of a crossventilatedbuilding is predicted by using theorifice equation. When the opening is small,flow becomes like infiltration through cracks, itis useful. However, the flow rate could beunderestimated when the orifice equation isapplied to the cross-ventilated flow throughlarge openings. The goal of this research is topropose the prediction method of the flow rateof a cross-ventilated building by considering thepower balance inside the whole stream tube.

Measurements and smoke tests show that thequadrants of a Windcatcher with a positivepressure across them act as supply ducts, whilethose with a negative pressure across them actas exhaust ducts.

The present research was aimed at the definitionof a design hypothesis for the construction of apharmaceutical warehouse in a hot humid areaof southern Sudan. The candidate hypotheseswere based on an existing prefabricated singlestoreypitched-roof steel stiuctural systems 18 mlong and 9 m wide and had to be constsuctible ata low cost and using local materials. At climaticlevel, the goal was that daily d.b. temperaturesnot exceeding 27-28 "C were reached bypassive of very low-energy means, which wasnot easy to achieve in the given conditions.

If thermal insulation and solar control ofbuilding envelopes are appropriately made forindoor thermal environment control, then themoderate air current becomes relativelyeffective for thermal comfort especially inresidentional buildings in summer seasons.To clarify the ways of natural ventilation withsufficient thermal insulation and solar control,we examined four cases of natural ventilation.We use an experimental house designed withthe concept of symbiosis in Tsukuba for tendays in August, 2007.

Development of a unique measuring unit for airflow volume within the vertical shaft of naturalventilation system with solar chimney with theresults of laboratory test and on-sitemeasurement is presented. As it was considerednecessary to make a continuous, siniultaneousmeasurement of a fluctuating air flow within thevertical shafts towards solar chimney, thesimple measuring unit was devised. This unitconsists of pressure detector and data logger tobe installed at several locations. First therelationship between the air velocity and thepressure difference was obtained in thelaboratory test.