Backyard Aquaponics - Home Aquaponics - Commercial Aquaponics A
building designed to collect heat when temperatures are cold
also needs to be able to vent heat when temperatures are warm.
Air exchange also is critical in providing plants with adequate
levels of carbon dioxide and controlling humidity. Because of
the concentrated air use by plants, greenhouses require
approximately two air exchanges per minute (in contrast to the
one-half air exchange per minute recommended for homes). Thermal
storage materials are effective in keeping a greenhouse cool in
summer as well as keeping it warm in winter. Since these
materials absorb heat during the day, less heat radiates within
the greenhouse when the sun is shining. When the sun goes down,
heat released from the thermal storage materials can be vented
out of the greenhouse. Removing external shading can also
decrease heat build-up within the greenhouse. Shading provided
by mature trees is not recommended. Active solar cooling systems
include solar air-conditioni