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Mechanical means or physical
1 Twin wall tent; 'fill' the void space with straw/grass; absorbent material; keep wet, circulating system, then get an air blower to push or pull air through the inter-space. This is the same concept to 'Iraqi air con'; yes there is cooling as there is constant heat loss through evaporation
1 Paint the external walls of the tent silver or cover in a good reflective material; glue aluminium foil to external skin
Sorry; this might seems a little 'blue-sky' but could help.