Abstract: An absorption refrigerator in which the refrigerant is miscible in the absorbent at the relatively low absorbing temperature and is at least partly immiscible at elevated temperatures, allowing separation of refrigerant and absorbant in the liquid phase.

Abstract: A gas drying system where the heat energy in the exhaust gas and the dried product is recovered to reduce the energy required to dry additional products.

Abstract: The concentration of the solute in solution in a saturated non-convecting solar pond is greatest at a lower hotter level decreases continuously toward a higher cooler level and is saturated at all levels, thus preventing solute diffusion. In the customary operation of such saturated non-convecting solar ponds, the heat generated by incident radiation is absorbed in a bottom or lower layer. Because of the continuously decreasing density of solute which is near saturation from the lower to the upper layers, there is little salt convection and the pool tends to be further stabilized. Further, by heating due to absorption of the radiation largely at the lower level, a temperature gradient is maintained in which the upper layers remain cool, evaporation and consequent loss of heat is inhibited and the efficiency of the solar pond is improved. It has been discovered that a brine consisting essentially of an appropriate mixture of sodium carbonate (Na.sub.2 CO.sub.3) and sodium bicarbonate (NaHCO.sub.