TABLE OF CONTENTS - The Professional Green Building Council

Theme B: Creating a livable, healthy and environmentally viable citiesMULTI-OBJECTIVE OPTIMIZATION FOR DESIGN OFVENTILATION SYSTEM IN APARTMENT BUILDINGSYOUNG-JIN KIM 1 AND CHEOL-SOO PARK 21 Master student, dept. architectural eng., Sungkyunkwan Univ., Suwon, South Korea2 Asst. Prof., dept. architectural eng., Sungkyunkwan Univ., Suwon, South KoreaABSTRACT: This paper addresses multi-objective optimization for design of residential ventilationsystem in an apartment floor plan in Korea. In the paper, optimal design means optimal sizing andlocation of diffusers/registers. Performance criteria for decision-making include initial andmaintenance costs, indoor air quality, energy use and comfort. The multi-criteria optimal designproblem introduces multi-objective optimization with Pareto optimality. In the study, the geneticalgorithm was chosen for solving this constrained discrete optimization problem. The CONTAMW2.4 developed by NIST (National Institute of Science and Technology) was used to simulateventilation phenomena. The paper shows an example of an optimal design problem for a chosenapartment plan.Keywords: ventilation, optimal design, apartment building, Pareto, Genetic Algorithm, multi-criteria1. INTRODUCTIONWith the recent increased expectation of better indoor environment, many researchefforts have focused on the Indoor Air Quality (IAQ). The IAQ is determined bythermal control, removal of indoor contaminants, proper ventilation, occupant’sbehaviour, etc. Among these, determination of adequate ventilation method(natural, hybrid or mechanical), size and location of diffusers and grilles, theamount of outdoor airflow rate is crucial. Hence, a new ventilation code [1] wasenacted in Korea in 2006 to ensure a healthy environment for occupants. The codespecifies a minimum 0.7 Air Changes per Hour (ACH, h-1) in multi-familyapartment buildings.This study aims to achieve optimal design of residential ventilation system inmulti-family apartment buildings from the architectural perspective. Here, adistinction should be made between mechanical and architectural perspective.Optimal design in light of mechanical perspective focuses on the efficiency of heat393