Using natural ventilation to cool on the hottest days:
On further analysing the data from the LSBU test room and running simulations in the Energyplus model, we found that a combination of cross- and stack-ventilation can keep the room comfortable for inhabitants 92% of working hours. On very hot days, a combination of nighttime cooling, daytime natural ventilation and blinds shading are effective to make the office room thermally comfortable.
Figure shows indoor thermal conditions for weekdays during July-August period in 2017 under the best window control scenario during working hours
Researchers across our three universities have been making progress building the MAGIC models, planning the next test site in Cambridge and conducting supporting experiments in the water tank and wind tunnel. Here's a snapshot of some of our latest findings. A full summary of our research can be found in the paper recently published paper in Building Research and Information: Natural ventilation in cities: the implications of fluid mechanics.
Read previous updates in our MAGIC circular, produced quarterly:
Wind tunnel MAGIC
This is a bird’s eye view of wind tunnel model of the London Road test site. The latest addition is the accurate roof features - the devil is in the detail! The wind tunnel mean flow was from left to right. The light beams of the laser Doppler anemometer were deflected with a mirror to measure wind velocity at roof height and below. Surface pressure was measured at the test room windows and we found that the roofs had some effect on the pressure difference between the road and the courtyard sides.