Jakob B. Knudsen
Measuring ventilation in different typologies of rural Gambian houses: a pilot experimental study
Knudsen, Jakob B.; Pinder, Margaret; Jatta, Ebrima; Jawara, Musa; Yousuf, Mahamed A.; Søndergaard, Amalie T.; Lindsay, Steve W.
Mahamed A. Yousuf
Amalie T. Søndergaard
Professor Steve Lindsay firstname.lastname@example.org
Background: African houses are frequently too hot and uncomfortable to use a bed net at night. Indoor thermal comfort is often evaluated by measuring temperature and humidity, ignoring ventilation. This study explored ways to measure ventilation in single-roomed rural Gambian houses during the malaria transmission season and evaluated building designs that could increase airflow at night and help keep the occupants comfortable. Methods: Two identical mud-walled houses were constructed with a metal roof, three doors and closed eaves. Experiment 1 compared five methods for measuring ventilation in a building: (1) using a blower door, (2) increasing carbon dioxide (CO2) levels indoors using an artificial source of CO2 and then measuring the rate of gas decay, (3) using a similar approach with a natural source of CO2, (4) measuring the rise of CO2 when people enter a building and (5) using hot-wire anemometers. Experiment 2 used CO2 data loggers to compare ventilation in a reference metal-roofed house with closed eaves and badly-fitting doors with a similar house with (1) thatched roof and open eaves, (2) eaves tubes, (3) screened doors and (4) screened doors and windows. Results: In experiment 1, CO2 data loggers placed indoors in two identical houses showed similar changes in airflow (p > 0.05) for all three methods recording either decreasing or increasing CO2. Blower doors were unable to measure airflow in houses with open eaves or screened windows and the anemometers broke down under field conditions. In experiment 2, open eaves in thatched houses, screened doors alone, and screened doors and windows increased indoor ventilation compared to the reference metal-roofed house with closed eaves and badly fitting doors (p < 0.05). Eaves tubes did not increase ventilation in comparison to the reference house. Conclusion: CO2 data loggers proved to be a simple and efficient method for measuring ventilation in rural houses at night. Ventilation of metal-roofed houses can be improved by adding two screened doors and windows on opposite walls. Improved ventilation will result in increased thermal comfort making it more likely that people will sleep under a bed net.
Knudsen, J. B., Pinder, M., Jatta, E., Jawara, M., Yousuf, M. A., Søndergaard, A. T., & Lindsay, S. W. (2020). Measuring ventilation in different typologies of rural Gambian houses: a pilot experimental study. Malaria Journal, 19(1), Article 273. https://doi.org/10.1186/s12936-020-03327-0
|Journal Article Type||Article|
|Acceptance Date||Jul 7, 2020|
|Online Publication Date||Jul 31, 2020|
|Deposit Date||Aug 19, 2020|
|Publicly Available Date||Aug 19, 2020|
|Peer Reviewed||Peer Reviewed|
Published Journal Article
Publisher Licence URL
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.
You might also like
Skin microbiome alters attractiveness to Anopheles mosquitoes