Thermogenn Cooler (EvaKuula)
The EvaKuula is a milk cooler for small dairy farmers with no access to grid electricity, that can cool milk to 4-6 °C for 12 hours.
The EvaKuula milk cooler is a prototype for small dairy farmers with no access to grid electricity. The device uses biogas to cool milk to 4-6 °C for 12 hours.
Currently in the pilot distribution phase: the expected production cost is 572.56 USD
Fine Lined Evaporative Cooler (by Dominic Wanjihia), Rapid Milk Chiller (from Promethean Power systems), Biogas Milk Chiller (from Simgas), kerosene fridges available locally.
Goal 2: Zero hunger
Dairy farmers in Sub-Saharan Africa
This product is currently in the prototyping phase and not yet manufactured at scale.
Other: Currently only available as a prototype
Directly from designer. Prototype product
As of March 2018, 43 units have been deployed in Uganda.
The holding volume, measured in liters
Length of time it takes to cool products, measured in hours
Time the products remain cold, measured in hours
Is there a way to control temperature?
Maximum internal temperature, measured in degrees Celsius
The materials used in construction
Does the product prevent insects from entering the chamber?
What is the medium for cooling?
The EvaKuula kit contains two main components: a thermization unit and an evaporative cooling unit. The evaporative cooling unit is composed of up to four milk canisters placed inside a chamber with water and an external wind-powered mechanical air extraction fan. Each milk canister can hold 20 L of milk. The walls of the chamber are lined with an insulating material such as charcoal. A biogas or propane energy source can be used to speed up cooling time.
The designers aim for their product to cool milk to 4-6°C within 3-4 hours and to stay cool for 12 hours.
No third-party organizations, only testing performed by the designer.
Biogas is primarily composed of methane and carbon dioxide, which pose safety concerns if inhaled. Other safety concerns include explosion, asphyxiation, disease, and hydrogen sulfide poisoning.
The designer recommends connected the device to a biogas generator to speed up cooling times.
Kisaalita, W. S., Franklin, J., Tippie, A., Boyer, B., Faircloth, W., 2006, Comparative Feasibility Analysis of Alternative Renewable Energy Sources for Small Milk Cooling Plants of Southwestern Uganda, Agricultural Mechanization in Asia, Africa and Latin America, 37, pp. 69-75.
Kisaalita, W. S., Katimbo, A., Sempiira, E., Mugisa, D., 2018, EvaKuula Saves Ugandan Smallholder Farmers’ Evening Milk, Sustainable Energy Technologies and Assessments, 29, pp. 155-163.
The EvaKuula met national safety standards and was approved for commercialization by the Uganda Dairy Development Authority. Interview with representative
The EvaKuula received the American Society of Agricultural and Biological Engineers 2019 AE50 Award.
This product was designed at the University of Georgia in the ENGR 4920: Engineering design project (international section, with service-learning component) course taught by William Kisaalita.
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