Nighttime Flushing
In high daytime temp. and low nighttime temp's, ventilate building at nigh to cool it and close during the day
Reduces temp. up to 20 deg at the daytime peak.
Roof Pond
Pond or bag of water on the roof with sliding insulating panels over the top of them.
Summer: panels are closed daytime and the water absorbs heat radiated from the house below, At night the panels are opened and the heat is reradiated to the night tsky.
Requires relatively clear climate, cloud cover would reflect radiation back down.
Winter: System works in reverse, panels are open during daytime absorbing the sun, closed at night to radiate absorbed daytime heat into the house.
Black bags work best creating greatest heat gain, high absorptivity and emissivity.
Insulation panels are foil backed on both surfaces.
Radiation is the key thermal process
Insulated pond
In snowy winters and hot humid summers
buildings built with an insulated pond covered by an insulated dome.
during winter snow machine sprays a fine mist of water into the pond while dome open to outside air.
Giant pile of snow is formed where the pond used to be.
In spring, dome closed off, snow/ice melts creating excellent source of chilled water for air conditioning systems.
only feasible in rural or suburban campuses where there is sufficient low cost land.
time: 0.25, 10:50-11:05pm 6/15/09
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