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The town of Coober Pedy in South Australia is located in the desert, with an average daily maximum temperature of 37C (98F) in January.Many people there live underground, with the soil providing a layer of insulation from the daytime temperature, and some thermal inertia (the average night temperature in January is a more tolerable 22C/72F).
The problem with trying to cool by pumping cold air from a mountaintop into the valley is the reason why it is cold to begin with: its altitude. As the atmosphere circulates, air rises and falls. As it rises, it expands and cools; and falling, it heats. If you pump cold air from a high altitude to a lower altitude, the greater atmospheric pressure at the lower altitude will cause it to compress and heat, thereby nullifying the cooling. An alternative that might work is to transfer the temperature of the high altitude to a less-compressible medium and pump that instead. Thus, a heat exchanger on the mountain would cool water, which would then be pumped down into the valley. Undergoing very little compression, it would remain at essentially the same temperature. Then the cold water could be used to cool building, be pumped back up the mountain, discharge the heat up there, and so on. This would work, but the problem is to be able to do it at less cost than is required for other cooling methods. That might be easier said than done. If you want to keep pumping costs low, a large diameter pipe and capacious heat exchanger are needed so that little energy is lost due to viscosity. Also, the pipe needs to be well insulated, and the slower the water moves, the better the insulation must be. I don't know how the economics of all this would work out, but it is clear that a substantial infrastructure must be installed, the cost of which may make it infeasible.
Much better would be to instead paint all the roof surfaces white or silver, so as to reflect light and heat away, and to cover parking areas with a roof structure that is all solar panels, using this power to run regular air conditioners. Less energy hitting the ground from the reflected light, and the panels absorb light that otherwise would hit bare concrete or tar, reducing local heating.
Hope this helps.
Can we pump cold air from one place to another ? certainlyCould a town be cooled by pumping in cold air?No it could not by the rules of thermodynamics, Things have an entropy , entropy is basically a system as a whole and the amount of energy a system contains or can contain.