1
The pipes of low cost solar water heating system are made of which of the following material ?
EXPLANATION
Textile Effluent Treatment & Ecological Stand
- Piping Material for Low-Cost Solar Water Heating Systems:
- Material Characteristics:
- Copper (Cu): Widely used for absorber tubing and riser pipes in flat-plate solar water heaters due to its exceptionally high thermal conductivity ($\approx 385\ -\ 400\text{ W}/(\text{m}\cdot\text{K})$), superior corrosion resistance to domestic potable water, and excellent ductility facilitating tight braze joints.
- Comparison:
- Brass: Lower thermal conductivity (~110 W/m·K) and higher cost.
- Steel: Prone to rust and galvanic corrosion in wet oxygenated water.
- Aluminium: Vulnerable to galvanic and pitting corrosion in hard water.
- Conclusion: Copper (Option 2).
Correct option: (2) Copper
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