<div class="htmlview paragraph">Transpirators are light and efficient evaporative coolers which we proposed /<span class="xref">1</span>, <span class="xref">2</span>, <span class="xref">3</span>, <span class="xref">4</span>, <span class="xref">5</span> and <span class="xref">6</span>/.Till now they were constructed with commercially available materials.</div> <div class="htmlview paragraph">We determined the cooling capacity of Transpirator-elements and of a Transpirator-cooler, equipped with nine elements.</div> <div class="htmlview paragraph">Advantages of the Transpirators are:</div> <div class="htmlview paragraph"> <ul class="list disc"> <li class="list-item"> <div class="htmlview paragraph">No loss of evaporating coolant in liquid or solid state</div> </li> <li class="list-item"> <div class="htmlview paragraph">Low weight and low volume</div> </li> <li class="list-item"> <div class="htmlview paragraph">Good adaptability to heat rejection at different temperature levels</div> </li> <li class="list-item"> <div class="htmlview paragraph">Modular structure, and therefore numerous possibilities of configuration and of subdivision into independent subunits</div> </li> </ul> </div>