About The Solar Icemaker

The ISAAC Solar Icemaker operates on the ammonia absorption refrigeration technology.

Ammonia absorption is used in industrial and commercial refrigeration. In domestic refrigeration, it was replaced by modern refrigeration with the development of electricity and freon refrigerants long ago; but now it is important for small-scale uses because of the need to conserve electricity and fossil fuel and because of the needs for food security, especially in rural unelectrified communities.


several members of the coperative stand near the solar panels
Solar Ice Company partnered with Heifer Project International for a demonstration of the ISAAC Solar Icemaker in Kenya. Please visit SAVE THE FOOD for more information and to help support this project.

The operation of the ISAAC is diagrammed below. It operates in two modes to complete the cycle. During the day, solar energy heats the generator to make ammonia vapor which is condensed and collected. During the night, the generator cools and reabsorbs the refrigerant As the refrigerant evaporates, the water in the evaporator is frozen.

diagram of how solar heat and refrigerant make ice diagram of how heat absorbtion and refrigerant make ice at night
The system alternates between the day mode and a night mode for the complete refrigeration cycle. During the day, refrigerant is generated by collecting solar energy. During the night, the refrigerant is recycled back to the generator as water is frozen.

The equipment is very durable. The ISAAC makes up to 50kg of ice per sunny day, which is enough to chill up to 100kg of food for a day. This gives the rural farmers and fishermen more time to market their products to the urban areas.

The ISAAC Solar Icemaker was developed by Energy Concepts Company. The Solar Ice Company is a sister company and produces and promotes the solar icemaker.

To help people in developing nations get the benefits of rural refrigeration, please visit www.SaveTheFood.org Thank you.