Slam Valve Motor, supplying
efficient steam engines for homeowners and professional solar installers
Bringing you the very latest in 18th century steam engine
The tiltable Fresnel reflector
To generate steam economically
from solar power, one requires an economical solar collector. The
tiltable Fresnel is the best choice for small to medium steam
consists of galvanized steel water pipe, evacuated tubes available as
spare parts for solar water heaters, and long strip mirrors. This
design has no moving plumbing parts, and requires mere ounces of force
to tilt each mirror to track the sun. The array itself does not move.
When mounted to a south facing
roof, the cross section to wind is very low. This low cross section
reduces strain which could be transferred to the roof. Stainless steel
reflectors are maintenance free and recommended for long lifespan.
tiltable Fresnel can be assembled easily in place by a homeowner or by
a professional installer. Mechanical tolerances are wide, the tuning
procedure compensates for many issues. The evacuated tubes require only
an optical gain of 3 to provide reasonable efficiency to source steam
for an engine, normal arrays run a gain of 10. Other collector designs
have gains of 50 and up, requiring precision parts and alignment. The
primary material expenses are the galvanized pipe, available at any
hardware store, galvanized and aluminum angle stock, and the mirrors.
For those who would rather not build it themselves, check out Sopogy.
King of the mirror material is #8 finish stainless steel, costing $5.50
per square foot in 4x8 sheets. Compare that with photovoltaic cells at
$60 per square foot and up. The Fresnel generates comparable
per square foot as photovoltaics. The tiltable Fresnel saves you money
by enabling you to do the work yourself. Download the instructions and
the spreadsheet tool which will help you to select the proper size and
configuration for your location. The Fresnel spreadsheet tool allows
to vary parameters like location, pipe length, shading, tube spacing,
insulation thickness, and operating temperature to see the effect on
total power generated.