PREDICTION OF INFLOW DIRECTION AT LARGE OPENING OF CROSS VENTILATED APARTMENT BUILDING

Abstract

ln case of cross ventilatien through the 1arge opening ， it is well known that the in 且ow direction at the opening is not normal to 血e olrening ． This is one of the 匸 eason to cause the e 匝 or in calculation when the conventional ' orifioe equation 幽 is adopted fbr cmss ventilation ． in this paper， autho 匸 s proposed the simpli 血ed predic 直on method of 山 e inflow direction at the inlet opening and 血e airfiow mte simultmeousl 払 The new co 且cept and the cere of 血 is method iS the predic 口on of i皿fiow direction at 電 he openi by uBe of v tor composition of the wind velocity parallel to wall and norrnal to the opening ． As the first step of 電 he validation of this method ， the prediction accuracy of the inf ］ ow dh℃Ction was investig 飢ed ． The w 血d 加 nnel tests using a three − storied apa 血 nent building model with a mom were oonduc1ed to investigate the inflow d鵬 ction ． The combination of the room positions and the extemal wind ・ directions nlake various inflow directions at the inlet operiing ． lhe measurement res 山 s of infiow direc 直on were compared With the calcUlated results． KeJwords ' cross ventilation ， prediction ， inPOW directioag wind tunnel test 通風 ， 予 測 法 ，流入角 ， 風 洞 実 験 1 ． lntroduction Cmss ven "監 ation has been studied fbr long time by many researchers ， especia 旦 ly Japanese researvhers bave been interested 血 1 s topic becausc 血 e ss ven 丗 ation is common used in Japan to imprDve the in（ 曲 ermal cnvironmem in hot su er se 器 on D 』 5 ） ． Recently the rnembers of IEA − ECBCS Amex 35 （ HybVent ）have b巳 en conduc 血 g energetic researches and many usefUl results have been obtained as well 6） ． e） ． In case of cross ventilation through the iarge opening ， it is we 且 監 own 血 at 血 e cross ventilation makes a flow contact of w 血 dward and lθeward open 血 gs as shown 血 Figure 1． h1 雌 s situation ， the use of geneml diScharged coefficient （ CD ） values is not suitable fbr血 e ca 且 culation of cross ven 田 ation 凱 e ， The 重 otal pressure loss coefficicnt of tle rvom （ ξ ） becomes smal 且 er than the comlectien of the pressure loss coerncierit of an op 。ning 孟 nseries （ ζ1 ＋ ζ 2 ） ． CD value is 血 e recipr al of square root of ζi ＋ ζ 2 ， so the calcUlation by CD values 皿 血 一 estimates 血 e cmss ventiladon 儲 恥 deal with this dec匸ease of pressure loss coefficient ， 【 shihara D proposed ' Interf nce fa釦 ）r ' which is the ratio of C to Z ζ ， S ondly ， the pressure less coerncient or C 。 value of an openin9 varies widl dle 且ow direction and tle use of nom 紐 values ever − estimates tle airflow rate 」 sh 血 am D also showed the experimental data and ξbecomes large in case o 圸 e larger argument of tWo ope 血 gs ． Many researthers a爬 suppOrtilg 伽 se two tendencies of the pressure loss ooemcient D ． 」，9， ． 13 ） ． More detailed 毘 vlews about 血is p匸oblem a【 e s n in Kurabuchi and Ohba l4） ． Although there are many rosearches from the above − mentioned viewpoint ， thore used to be few researches to develop the simple but reasonable prediction method of the cmss ventilation fate ， Recently ， Kurabuchi et al． 1 の tried Io reveal the m hanism of closs v 直 lation usillg CFD and pmposed ' Loca1 Dynamic Similarity Model of Cross Ventilation ' as the syste tic prediction method of now rate． h this paper ， reasonable 翻 sys 記 觚 c 蝉 iction method o 紬 e ss v tii 飢 i（順 r孤 e 跏 ugh l 缸 ge no flOW contact rQOm with small openings rOOm with brge openhgS ζ 1 ＋ ζ 2 ξ＜ ζ 1 ＋ ζ 2 ↓ ↓ Q ・ 噛 、 ・ 伊 9 ・ か伊