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[Instrumental]
>> Lizzie: So a key part of this zero energy equation is to reduce our energy needs. So
a huge thing for me - probably even more important than the photovoltaics, is insulation. Insulate,
insulate, insulate! Just reduce the amount of energy you need to cool down a building
or heat it up. Ray: We insulated underneath the rafters.
The standard in Florida for roofs is R19; we have a much fatter coat on here, we have
an R30 roof so we have a lot of insulation that prevents heat from coming inside the
building. Lizzie: We're using photovoltaic energy which
is energy from the sun to generate electricity, we're using thermal energy - solar thermal
energy where we're using the heat and the energy from the sun to heat up water which
is so important in a cafe, you imagine the number of plates that we're washing, and the
amount of water we're heating up to make coffee. Ray: What a solar thermal panel is is basically
it's a flat panel with copper tubing in it and it's painted black and what it does is
it heats up water. That water will heat to 170 degrees absolutely free.
Lizzie: And then the third crucial technology is geo-thermal. We have gone down 450 feet
below the Rosedale cafe into an aqua fir where the water temperature is 72 degrees. So all
we have to do is bring it up a 450 foot well, pass it through some heat transfer technology
and cool down the air in the cafe, or in the Winter, heat the air up - and we just said
this has to be integrated. The whole thing has to work so that we are very efficiently
using our most expensive piece of technology.