There was a lengthy discussion about using a cistern for cooling.
Heat is like water/electricity, you need potential (differential) to transfer it, so 54 degree water "might" cool air down to 70 degrees if you move enough water through the exchanger. Refrigeration takes weak energy (low differential) and moves it to where it can become usable by state changes thus creating enough differential to allow heat to transfer via an exchanger.
Heat is like water/electricity, you need potential (differential) to transfer it, so 54 degree water "might" cool air down to 70 degrees if you move enough water through the exchanger. Refrigeration takes weak energy (low differential) and moves it to where it can become usable by state changes thus creating enough differential to allow heat to transfer via an exchanger.