Mali: Design and dissemination of clay pot coolers

Adding water to a pot-in-pot evaporative cooler, Mali.
Adding water to a pot-in-pot evaporative cooler, Mali.

 
MIT D-Lab is working with the World Vegetable Center and Institut d'Economie Rurale (IER) to improve the design of clay pot coolers and increase their dissemination in rural Mali. This project builds on design and user research work conducted in 2017.

Design research 

This portion of the project focuses on evaluating the performance of clay pot coolers and other similarly-sized storage devices in a laboratory setting. The temperature and humidity inside the storage devices are evaluated with data-logging sensors designed in partnership with Sensen, and the shelf-life of vegetables in each device is measured and compared with storage in ambient conditions. The vegetables included in this study are spinach, cowpea leaves, amaranth, tomatoes, eggplant, and the shelf-life is measured through a combination of quantitative and qualitative techniques including weight loss, colorimetry, firmness, vitamin C content, acidity, wilting index, and visual evaluation.

 

Research team and clay pot cooler experimental setup
Research team and clay pot cooler experimental setup. Left to right: Wubetu Legesse, Alkassim Dicko, Eric Verploegen, and Edoh Ognakossan.
Kadidia Nienta (left) and Boureima Djiguiba (right) with leafy green for ready for analysis
Kadidia Nienta (left) and Boureima Djiguiba (right) with leafy green for ready for analysis.

Dissemination of clay pot coolers in Mopti, Mali

To raise awareness and build local capacity to construct and sell clay pot coolers, MIT D-Lab and the World Vegetable Center developed a training curriculum covering:

  • Importance of proper vegetable storage
  • Principles of evaporative cooling
  • Best practices for constructing and using clay pot coolers
  • User identification and marketing

In March 2020, Mr. Boureima Djiguiba, an extension officer with the Regional Directorate of Agriculture and Ms. Kadidia Nienta, a clay pot maker and seller, delivered trainings at two horticulture cooperatives in Mopti, Mali. Participants in these trainings included extension officers, vegetable retailers, pot makers and sellers, farmers, and members of households. We will be following up with the participants in the coming months to monitor the impact of the trainings and improve the training program. There will be additional trainings throughout Mali over the next three years.

 

A group of participants from Mopti, Mali after the completion of a training about clay pot coolers
Kadidia Nienta (left) and Boureima Djiguiba (right) assembling a clay pot cooler.
A group of participants from Mopti, Mali after the completion of a training about clay pot coolers
A group of participants from Mopti, Mali after the completion of a training about clay pot coolers.

This project is funded in part by USAID's Global Development Lab.


Related publication

Evaporative Cooling Technologies for Improved Vegetable Storage in Mali
In 2018, MIT D-Lab and the World Vegetable Center published a research report evaluating clay pot coolers and brick evaporative cooling chambers. The methodologies used included interviews with users of the cooling and storage technologies, interviews with stakeholders along the vegetable supply chain, and sensors to monitor product performance parameters.

Contact

Eric Verploegen, MIT D-Lab Research Engineer