TABLE OF CONTENTS - The Professional Green Building Council

Theme C: Education and Market Transformation3.1 Computer ModelA computer model is set up using HTB2 [9] to study the thermal effect of GCHSon both cooling and heating demand in the classrooms. Three classrooms in thedance classroom block are chosen for simulation (Figure1, Figure17). Two sets ofGCHS systems are tested to see their effect on the heating/cooling loads andindoor air temperatures.i) GCHS Model 1:The system consists of a set of 12 underground cement air pipes buried 2 metresinto the ground, each 0.3m in diameter and 30m in length. The external aircollected in the air inlet splits evenly to the underground pipes, exchanges heatwith the earth mass while passing through and then enters the building from belowto the outlets in each room with an air change rate of 0.2m 3 /s (Fig. 18).Figure 18: GCHS Model I.ii) GCHS Model II:A second set of pipes is added to GCHS Model I to allow more heat exchangeunderground (Fig.19).Figure 19: GCHS Model II.633