Updated on January 30, 2024

·

Created on May 28, 2014

Zeer Pot

Upcoming Update

An open-source evaporative cooling storage container for households.

Developed By
  1. Mobah Rural Horizons and Practical Action
Tested By
  • MIT D-Lab
  • Practical Action
Content Partners
Unknown

Author

Product Description

Zeer Pot is a simple fridge made of local materials consisting of one earthenware pot set inside another.

Target SDGs

SDG 2: Zero Hunger

Market Suggested Retail Price

$20.00

Market Suggested Retail Price (Secondary Currency)

$2.00

Target Users (Target Impact Group)

Household, Community

Distributors / Implementing Organizations

Open-source technology, locally manufactured. Mobah Rural Horizons, Practical Action, and The Desert Fridge distributed by Humanity First.

Competitive Landscape

Manufacturing/Building Method

Most groups providing Zeer Refrigeration depend on individual and local manufacturers. Mobah Rural Horizons reported producing on average 30,000 Zeer Pots as of 2005.

Intellectural Property Type

Open-source

User Provision Model

Mobah Rural Horizons is the main distributor. Implementation of evaporative cooling refrigeration has been demonstrated throughout Nigeria. Majority of production located in Kano, Jigawa, Borno, Yobe, Sokoto, Zamfara, Kebbi and Katsina States, all in the northern region of Nigeria.

Distributions to Date Status

Unknown, but a production capacity of 30,000/year is claimed

Storage capacity (L)

Ranging from 10-150 liters, depending on the pot design

Time to cool (hr)

Depends on the specific design and operating conditions

Cooling retention (hr)

Depends on the specific design and operating conditions

Temperature control

no

Minimum internal temperature (°C)

Approximately 10-15° cooler than ambient temperature

Materials of construction

Clay, river sand, and jute bag or cloth for cover

Protection from insect entry

yes

Refrigeration cycle catalyst

1.5 – 2.5 L of water/day

Design Specifications

The underlying principle behind the Zeer Pot is that as water evaporates it will remove heat from it's surroundings. To take advantage of the evaporative cooling effect, take two earthen pots of the same shape but different sizes, put one within the other, fill the space between the them with sand and pour water into the same cavity (or other substrate e.g. coconut fiber) to make the sand wet. The result is that when you place food items into the inner pot, cover with a lid or damp cloth you can keep the temperature up to 10-15 degrees cooler than the external environment. Store the pot-in-pot refrigerator in a dry, well-ventilated space; and let the laws of thermodynamics do the rest. As the moisture in the sand evaporates, it draws heat away from the inner pot, cooling its contents. The only maintenance required is the addition of more water, around twice a day.

Product Schematics

Technical Support

Zeer pots designs are open-source. Technical support can be provided by the local manufacturer (ex. local artisan or potter). Detailed information regarding construction and use can be found in MIT D-Lab's Evaporative Cooling Best Practices Guide.

Replacement Components

Zeer pots designs are open-source. If a pot is broken, local clay materials should be used to repair or replace the unit.

Lifecycle

Zeer pots last until contaminated or damaged at which point they can be used for cooking bowls or returned to soil and can be used to make new clay based products.

Manufacturer Specified Performance Parameters

If operated in hot and dry climates (greater than 25 °C and less than 40% humidity) they can be expected to provide a storage environment with humidity greater than 80% and temperature at least 8 °C lower than the maximum daily ambient temperature. Some specific performance targets include: • Minimum internal temperature of 15ºC • Storage volume for 12kg of fruit and vegetables • Consumes 1.5 - 2.5 L water/day

Vetted Performance Status

A report by MIT D-Lab and World Vegetation Center presents extensive testing comparing various evaporative cooling technologies, including the Zeer Pot. This study determined that evaporative cooling technologies could improve vegetable shelf life by providing a stable environment with low temperature and high humidity while also protecting food from insects. A report by Practical Action evaluated different materials and shapes for Zeer Pot designs. The report claims that the shelf life of vegetables can last up to five times longer when they are stored in a Zeer Pot.

Safety

The only risks associated with evaporative cooling is possible contamination and spoiling of foods; however, this is already a threat to vegetables and the Zeer Pot serves to reduce rate of decay and frequency of contamination. It must be understood though that use of evaporative cooling refrigerators may not be effective in all conditions and environments and this is especially important if it is used to store vaccines and other medicines. Users may require some education about maintenance and ideal storage for them to be effective.

Complementary Technical Systems

Technologies related to creating clean fuel sources for when firing the pots, sourcing clay and those that ensure that the community has a ready source of water for evaporative cooling (e.g. hand-powered well digging rig).

Academic Research and References

Verploegen, E., Sanogo, O., Chagomoka, T. (2018). Evaluation of Low-Cost Vegetable Cooling and Storage Technologies in Mali. Copyright © Massachusetts Institute of Technology (Accessed on 30 Oct 2018).

Odesola, I. F., Onyebuchi, O., A review of porous evaporative cooling for the preservation of fruits and vegetables. The Pacific Journal of Science and Technology. 2009 Nov, 10(2):935-941.

Basediya, A. I., Samuel, D. V. K., Veera, V., Evaporative cooling system for storage of fruits and vegetables – a review. Journal of Food Science and Technology. 2013 Jun, 50(3):429-442.

Anyanwu, E. E., Design and measured performance of a porous evaporative cooler for preservation of fruits and vegetables. Energy Conversion and Management. 2004 Aug, 45(13-14):2187-2195.

Compliance with regulations

Unknown

Other Information

Awards received include 2000 Rolex Awards to Mohammed Bah Abba, 2006 Tech Museum of Innovation Award, 2007 Santa Clara Global Social Benefit Incubator Practical ActionThe Desert Fridge The evaporative cooling effect MIT D-Lab's Evaporative Cooling Best Practices Guide Report by MIT D-Lab and World Vegetation Center Individual ceramic refrigerators do not seem to be tested as they are made locally. However, research has been conducted by MIT D-Lab and Practical Action. Zeer pot refrigerator/Design

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