TABLE OF CONTENTS - The Professional Green Building Council

Theme B: Creating a livable, healthy and environmentally viable citieseq. (14)eq. (15)eq. (16)hca,2 5.83 2.60ξ8 3.3613 1.7637ξ9 2.9655 1.7970ξ10 0.4143 0.1658Δ T 2.32°K 1.69°Khca,3 8.11 3.37ξ11 3.1571 1.9520ξ12 2.5030 1.8544ξ13 0.2107 0.0869Δ T 1.42°K 1.48°Khca,4 5.73 3.63ξ14 3.8249 3.3751ξ15 0.0144 0.1303Δ T 5.53°K 2.14°Kh 3.83 3.29inDespite the fact that u out of System 1 is higher than that of System 2 in Eq. (11),System 2's h outturned out to be higher. This is because h outis more affected by thelocal surface wind velocity ( u lsv) than u out (Eq. (11)), and unknown parametervalues ( ξ 1 - ξ 3 ) that reflect the wind speed, wind direction and nature of surface varyaccording to the system. Thus, it can be inferred that use of literature values as afunction of u out without making modifications based on considerations of surfacematerial and surrounding environments can make the model inaccurate.The difference in hca,1between the two systems is 2.75 W/m 2 , and difference in ξ 4is 2.223, indicating that ξ 4 has a major influence on hca,1. ξ4is a parameter to reflectthe end effects since most of the literature values are based on the experimentsutilizing a guarded hot-plate technique that measures the convective heat transferonly at the center of the test region, consequently excluding the end effects. In caseof System 2, it is found that the top and bottom part of the system is well insulatedso ξ4of System 2 is less than that of System 1.hca,2, hca,3account for convection caused by the temperature difference between thecavity air and the glazing surfaces. Therefore,ca,2h ,ca,3h of System 1, which has a510