【采暖通风与空气调节设计规范GBJ1987】建设部标准定额司编.pdf
NATIONALSTANDARD OFTHEPEOPLESREPUBLICOFCHINA CODEFORDESIGNOFHEATING,VENTILATION ANDAIRCONDITIONING GBJ19-87 Chief editorial department:ChinaNational Non-ferrousMetalsIndustryCorporation Beijing199 Approved department:StatePlanning Commission of P.R.China Dateofeffect:Aug.
December30th1987 StatePlanningCommissionofthePeoplesRepublicofChina State Planning Commission,P.R.China IssueNo.[1987]2480 NoticeonPromulgationoftheNationalStandard,theCode forDesign ofHeating,Ventilation and Air Conditioning Inaccordancewith theNotice,issue No.
MainSymbols a—Factor forcorrectionof temperature difference ofenvelope;turbulent C一Breezelessness;theratiOf effective thermalpressure difference to effectivewind pressure difference;factor;coefficient hHeight;elevationofcenterlineforcalculateddoor orwindow;height h,-Heightdifferencebetweencenterof