Download or view SolarCooker.frink in plain text format
// Solar cooker design program
f = eval[input["Enter focal length [4 feet]: ", "4 feet"]]
length = eval[input["Enter length of reflective material, long axis [100 in]: ", "100 in"]]
width = eval[input["Enter width of reflective material, short axis [36 in]: ", "36 in"]]
longspars = eval[input["Enter number of long spars [3]: ", 3]]
shortspars = eval[input["Enter number of short spars [7]: ", 7]]
inset = eval[input["Enter inset [2 in]: ", "2 in"]]
longdiff = (width - (2*inset)) / (longspars - 1)
shortdiff = (length - (2*inset)) / (shortspars - 1)
println[]
println["$longspars long spars will be " + (longdiff -> "in") + " apart."]
println["$shortspars short spars will be " + (shortdiff -> "in") + " apart."]
b = 100 in
println["Arc length is " + format[arclen[b,f], "in", 2]]
a = 36 in
println["Arc length is " + format[arclen[a,f], "in", 2]]
// Max height
maxHeight = parabolaHeight[length/2, width/2, f]
println["Maximum height is " + format[maxHeight, "in", 2]]
maxHeight = parabolaHeight[length/2, 0 in, f]
println["Centerline height is " + format[maxHeight, "in", 2]]
println["long\tshort\theight"]
wmin = shortspars mod 2 == 1 ? 0 in : longdiff
lmin = longspars mod 2 == 1 ? 0 in : shortdiff
println["\nCutting short spars:"]
for w = wmin to b/2 step shortdiff
{
if w == 0 in
print["x 1"]
else
print["x 2"]
println[" (length " + format[a, "in", 2] + "), " + format[w, "in", 1] + " from center"]
for l = lmin to a/2 step longdiff
{
print[format[l, "in", 1] + "\t"]
print[format[parabolaHeight[l,w,f], "in", 1]]
println[]
}
println[]
}
println["\nCutting long spars:"]
for l = lmin to a/2 step longdiff
{
if l == 0 in
print["x 1"]
else
print["x 2"]
println[" (length " + format[b, "in", 2] + "), " + format[l, "in", 1] + " from center"]
for w = wmin to b/2 step shortdiff
{
print[format[w, "in", 1] + "\t"]
print[format[parabolaHeight[l,w,f], "in", 1]]
println[]
}
println[]
}
// Find arclength of the curve over a box length b:
// (b sqrt[16 + (b/f)^2])/8 + 2 f arccsch[4 f/b]
arclen[b, f] := (b sqrt[16 + (b/f)^2])/8 + 2 f arccsch[4 f/b]
// Parabola height
// Equation for a parabola with focal length f is z = d^2/(4 f)
// where d is the distance from the center and z is the height.
parabolaHeight[x, y, f] :=
{
d = sqrt[x^2 + y^2]
return d^2/(4 f)
}
Download or view SolarCooker.frink in plain text format
This is a program written in the programming language Frink.
For more information, view the Frink
Documentation or see More Sample Frink Programs.
Alan Eliasen was born 19963 days, 13 hours, 47 minutes ago.