b'Figure2. Field experimental setup at BCIT Building Science Centre of Excellence to measure heat flow through different cavity widths. FIGURE 3: FIELD EXPERIMENTAL SETUP AT BCIT BUILDING SCIENCE CENTRE OF EXCELLENCE TO MEASURE HEAT FLOW THROUGH DIFFERENT CAVITY WIDTHS. ROYAL INLAND HOSPITAL PATIENT CARE TOWERKAMLOOPS, BCFigure 2 shows the heat flow measurements through exte-rior walls of different air cavity widths during a typical summerWe deliverweek in Vancouver. The total heat flow through each walluncompromising(Figure 3) is determined using the area-weighted average ofperformance.three heat flux transducers readings, which are installed along the wall centerline on the drywall, representing heatWe are Entuitive.flows at the lower, mid and upper sections of the test walls. The plot shows heat gain to the building as negative and heat loss as positive. In line with the flow patterns observed in the CFD simulation, the 19-mm air cavity wall allows significantly higher heat gain to the building during the day and heat loss at night when compared to the walls with larger air cavities. For the experi-mental period presented here, the increase in air cavity widthSUSTAINABLE BUILDING CONSULTINGADVANCED PERFORMANCE ANALYSISfrom 19 mm to 51 mm yieldedBUILDING ENVELOPE a reduction of heat gain to theBUILDING RESTORATION Sustainablebuilding by as much as 24.9 perBRIDGE ENGINEERINGcent. These results demonstrateCONSTRUCTION ENGINEERINGBuildingFIRE ENGINEERINGcavity ventilation, especially inPEDESTRIAN MODELLINGwider cavity walls that have theSPECIAL PROJECTS SOLUTIONSSTRUCTURAL ENGINEERING potential to reduce building heatTRANSPORTATION STRUCTURESgain and thereby help mitigateWOOD DESIGN SERVICES overheating of buildings duringentuitive.comhot summer periods. With that said, the impact that wider cavi- VANCOUVER| CALGARY |EDMONTON | TORONTO | OTTAWA | NEW YORKties may have on the walls heat loss during winter needs tobe quantified.FALL/WINTER 2022 19'