Water filled hoses may be placed under the collector to increase heat storage capacity.
2.
These methods rely on the U factor or thermal heat storage capacity of the earth itself below the frost layer.
3.
Coated materials offer the highest loading capacity of PCM and thus the largest heat storage capacity of any application technique.
4.
The high heat storage capacity in the phase change from solid to liquid, and the advantageous phase change temperature of 32 �C ( 90 �F ) makes this material especially appropriate for storing low grade solar heat for later release in space heating applications.
5.
And last, anything that could provide cold for a long time would either be through a chemical reaction ( maybe one you could add water to onsite ) or would have a very high heat storage capacity, which I think is called either specific heat or latent heat capacity, and would have to be physically cooled in a freezer or similar.
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