Here is an outside the box idea. It is theorized that the Amazon rain forest at least 30% of the rain is from transpiration. Some people even think that the Amazon would turn into a savana or even desert if all of the trees were cut down. Similarily some folks blame the excessivly dry condition of Australia on the fact that the Aborigine and later the Europeans cut and burned huge swaths of trees. Same problem - no transpiration Project this to your problem with cooling thermo solar energy generators. Build extensive solar thermal generators and use the salty or alkali water that is often available in desert environments. Use evaporative cooling which is very effective in a dry environment. Just before the water reaches saturation, let it into sealed evaporation ponds to complete its evaporation. If evaporation continued apace in the ponds, you might even be able to run cooling coils through the water in these ponds. All this evaporated pure water has to fall somewhere. Where it falls will depend on the prevailing wind but for inland deserts, it would likely be on nearby mountains. The salts in the evaporation ponds can be harvested from time to time if it has value. Most salts have some value.