TABLE OF CONTENTS - The Professional Green Building Council

Theme B: Creating a livable, healthy and environmentally viable citiesSTATE-SPACE APPROACH FOR LUMPED MODELING OFDOUBLE-SKIN SYSTEMSSEONG-HWAN YOON 1 AND CHEOL-SOO PARK 21Master student, dept. architectural eng., Sungkyunkwan Univ., Suwon, South Korea2Asst. Prof., dept. architectural eng., Sungkyunkwan Univ., Suwon, South KoreaABSTRACT: The application of all-glass smart double skin envelopes requires accurate models forthe simulation of their performance. In order to develop and calibrate this model, a simple lumpedmodel is postulated and a parameter estimation technique is used with data from full-scaleexperiments. It is found that the calibration model is surprisingly accurate and ideally suited for usein the ensuing optimal control and performance studies. It is also concluded that the simulationmodel should be calibrated depending on the system's configuration (height, cavity depth, glazing,etc.) and local surroundings since no universally applicable accurate simulation model exists at thismoment in time. This leads to the next challenge of developing an on-line self-calibration technique.Keywords: double-skin, parameter estimation, calibration1. INTRODUCTIONDuring the past few decades, double-skin systems have been widely introduced.Double-skin systems have the advantage of improving indoor thermal comfort,reduction of energy use, etc. In order to (1) make the best use of, (2) achieveoptimal design of, and (3) apply optimal control to double skin systems, a reliablesimulation model is a prerequisite to predict the system’s behavior.There are three approaches to mathematically modeling the system; (1) a wholebuilding simulation tool (Ex: Energy Plus, esp-r, etc.), (2) use of computationalfluid dynamics (CFD), and (3) the state space model approach. While the firstapproach is advantageous for assessing the influence of double-skins on theperformances of the entire building, it has limitation to express very detailedphysical phenomena occurring in and around the double-skin system involvingtransient convective and radiative heat transfer and airflow regimes in the irregular3D geometry. Furthermore, when a discrepancy between the simulation model andthe actual system exists, it is difficult to apply parameter estimation algorithm to497