There are many small scale farmers and fishermen throughout the world. Providing refrigeration by traditional fuels to all of these people would be enormous
and not sustainable, yet it is essential their food production is saved for food security. Providing refrigeration via solar energy is more sustainable.
Appropriate                Refrigeration             Technology

Many small-scale farmers and fishermen in developing countries do not have electricity. What they do have is abundant sunshine that can be used to make refrigeration.

One system that can make refrigeration directly from sunlight is the ISAAC™ Solar Icemaker. ISAAC stands for Intermittent Solar Ammonia Absorption Cycle. The system is based upon a refrigeration technology called ammonia absorption, which was used before electricity was developed. Now that we need to conserve fossil fuels and because the rural farmers and fishermen need to preserve their food, the ISAAC is an appropriate technology. The system is durable and easy to operate. The energy source is free and sustainable.

The basic operation of ammonia absorption is diagrammed below.
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.