AbstractStrictly speaking, all forms of energy are derived from the sun. However, our most common forms of energy, fossil-fuels, received their solar input eons ago and have changed their characteristics so that they are now in concentrated form. It is apparent that these stored concentrated energy forms are now being used at such a rapid rate that they will be depleted in the not-toodistant future. It would be useful to utilize the incoming solar energy directly. The effective use of the sun's energy in agriculture by any economically possible means will help the farmers continue their work with no disruption because of the lack of concentrated form of energy. The fluidyne heat engine utilizes solar energy to pump water. The simplicity, reliability, and low cost of this engine are of primary importance for the farmers in the part of the world whereas solar energy is abundant such as Puerto Rico.
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