TABLE OF CONTENTS - The Professional Green Building Council

Theme B: Creating a livable, healthy and environmentally viable citiesStep 1 involves defining the used encoding for the design variables as shown inTable 2. X 1 -X 3 is 1 if hybrid supply is installed and 0 otherwise. X 4 -X 6 and X 7 -X 9are the airflow rates of total and sensible heat exchangers (CMH: cubic meter perhour), and 0 indicates that such heat exchanger is not installed. X 10 is the rate ofthe hybrid exhaust (CMH). X 1 -X 10 are randomly selected within range of boundarycondition, and then converted into a 2000:1 vector. In other words, each of X 1 -X 10consists of 2000 individuals. For this study, the size of subpopulation was set at 40and the individuals of the subpopulation at 50 to generate the initial population,resulting in 2000.It is important to establish a proper population size for an optimization problem[16]. The size in this study was obtained through seven ‘trials and errors’ .Step 2: CONTAMW 2.4 and GAStep 2 involves integration of CONTAMW 2.4 with GA which runs on theMATLAB platform. The process is as follows: (1) The CONTAMW simulationinput files are read in MATLAB, (2) a new individual generated from GA isoverwritten in the CONTAMW 4 simulation input file by a matlab m-codes, (3)CONTAMW 2.4 is executed from MATLAB. (4) Once a CONTAMW 2.4simulation result file is created, the file is converted to a text file to be read inMATLAB. It should be noted that the CONTAMW 2.4 simulation result file is abinary file, SimRead3.exe is automatically executed in MATLAB to convert it to atext file. In Step 2, CONTAMW 2.4 input files are created from MATLAB,CONTAMW 2.4 simulation runs are carried out, the results are read until theiterative process finds a global minima.Step 3: objective function calculationIn Step 3, the four objective function elements (initial investment cost, operationcost, PD, and CO 2 concentration) are calculated. The initial investment cost datawas provided by a ventilation company (www.ventopia.com), a participant in thisstudy. The operation cost includes fan energy, heating energy and maintenance402