Envisaging a world with greener cities.

Related Projects: DAPPLE


DAPPLE is the generic name for a number of large meteorology and dispersion studies conducted by UK Universities.

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Early in the new year, a team of MAGIC researchers went back to our test room in the LSBU building at Elephant and Castle, to look in more detail at temperature and CO2 under different naturally ventilated conditions.

Where previously we had kept the monitors in for a period of weeks to track what was happening over time, now we wanted to dig down into specific events and see how they could impact temperature and air pollution in the room under controlled conditions.

Related information

circular

 
We feel it is important to  communicate all of our work and therefore produce a quaterly Circular summarising our achievements so far. The latest editions of the Circular can be downloaded from here:






experiments - latest

LSBU weekend experiments results

Window Monitors at the LSBU MAGIC test site (Megan Davies Wykes, 2018)  

Credit: Eric Fischer via Flickr

Project Funding:

EPSRC


MAGIC is an Engineering and Physical Sciences Research Council (EPSRC) funded project.

Eight postdocs packed into the test room on a Saturday. We let the CO2 and temperature increase for an hour and then did three tests, letting the CO2 and temperature increase between each one:
1. Single-sided ventilation (SSV): We opened a single window on the courtyard side and measured the drop in temperature and CO2 levels;
2. Cross ventilation (CV): We opened windows on each side of the room and measured the drop in temperature and CO2 levels;
3. Doorway exchange (D): We closed all windows and moved into the adjacent room, sealing the doorway behind us. After a period of time where the CO2 levels and temperature increased in the adjacent room, we opened the door between the two rooms, examining the increase in CO2 and temperature in the test room.


We found that CO2 levels with eight people in the room were very high - almost 2000 ppm. As shown in the results figure, below, the drop in temperature and CO2 was much more dramatic for CV than for SSV. We also observed differences in the vertical and horizontal thermal stratification. We carried out additional ‘comfort’ surveys, and under the CV scenario people reported that the room felt cold.


We found it helpful to do the experiments this way—the number of people in the room was constant and we were able to carefully control which windows or doorways were open. Looking ahead, we’re likely to combine long-running monitoring in buildings with this type of shorter-term, controlled testing. The spatial distribution of both temperature and CO2 under single-sided and cross ventilation conditions are still unclear so we will certainly be carrying out additional experiments to look into that further.

Related Projects: LoHCool


A collaboration between UK and Chinese Universities examining low carbon, climate responsive, heating and cooling of cities.