⚡Intermediate
Solar Thermal Systems
Low-tech solar water heating and cooking without photovoltaics.
Solar thermal systems capture sunlight as heat for water, cooking, and drying without complex electronics.
Key Concepts
- —Dark absorbers and glazing improve heat capture and retention.
- —Insulation and flow rate determine delivered water temperature.
- —Batch heaters are simple and robust for household use.
- —Solar cookers trade cooking speed for fuel independence.
Practical Guide
- 1.Build a batch water heater using dark-painted tank and glazed insulated box.
- 2.Orient collectors toward equator-facing direction with seasonal tilt adjustment.
- 3.Use insulated pipes and short runs to reduce heat loss.
- 4.Construct box or parabolic cookers from reflective salvage materials.
- 5.Include pressure and overheat safety features in closed-loop systems.
References
- [1] Kalogirou, S. A. (2014). Solar energy engineering: Processes and systems (2nd ed.). Academic Press.
- [2] Smil, V. (2017). Energy and civilization: A history. MIT Press.