Print PDF
Favorite
Email
Step 7
Case study 2: 36 Celsius water at 6:30pm,after a very warm but overcast day-Wellington NZ,December 1st 2008. This setup was installed on a sturdy shed roof, giving a 2.8m head above ground level,and back filled from a garden hose when empty.
Conclusion: Measured clear sky late November heating rates of ~3-4 degrees per hour were observed in Wellington (NZ), with cooling rates only ~1-2 degrees/hour. Even on overcast summer days, the 60 litres of water in the shell was noted to reach 35-40 degrees mid afternoon, and remain still pleasantly warm until after dark. In clear sky high summer, water temperatures nearer 50 Celsius look possible.
The approach offers a versatile, educational & cost effective approach to DIY seasonal solar water heating. Such enhancements as side insulation, double glazing top cover,heat exchanges, water depth & perhaps even "solar salt ponds" could readily be explored.
Conclusion: Measured clear sky late November heating rates of ~3-4 degrees per hour were observed in Wellington (NZ), with cooling rates only ~1-2 degrees/hour. Even on overcast summer days, the 60 litres of water in the shell was noted to reach 35-40 degrees mid afternoon, and remain still pleasantly warm until after dark. In clear sky high summer, water temperatures nearer 50 Celsius look possible.
The approach offers a versatile, educational & cost effective approach to DIY seasonal solar water heating. Such enhancements as side insulation, double glazing top cover,heat exchanges, water depth & perhaps even "solar salt ponds" could readily be explored.
| « Previous Step | Download PDFView All Steps | Next Step » |
 |
Add Comment
|
