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Problem 3.10 - A parabolic trough collector has a tubular steel receiver with a glass cover and the space between the receiver and the glass is evacuated. The receiver is 10 m long and has an outside diameter of 5 cm and an inside diameter of 4 cm . The glass cover diameter is 8 cm . If the receiver surface is selective with \( \varepsilon_{r}=0.11 \) and is at \( 250^{\circ} \mathrm{C} \), determine the overall heat loss coefficient of the receiver when environmental temperature is \( 24^{\circ} \mathrm{C} \), the wind speed is \( 2 \mathrm{~m} / \mathrm{s} \), and the glass emissivity is 0.92 . - The glass cover temperature, \( \mathrm{T}_{\mathrm{g}}=32.6^{\circ} \mathrm{C}=305.6 \mathrm{~K} \) is assumed. 82

          Problem 3.10
- A parabolic trough collector has a tubular steel receiver with a glass cover and the space between the receiver and the glass is evacuated. The receiver is 10 m long and has an outside diameter of 5 cm and an inside diameter of 4 cm . The glass cover diameter is 8 cm . If the receiver surface is selective with \( \varepsilon_{r}=0.11 \) and is at \( 250^{\circ} \mathrm{C} \), determine the overall heat loss coefficient of the receiver when environmental temperature is \( 24^{\circ} \mathrm{C} \), the wind speed is \( 2 \mathrm{~m} / \mathrm{s} \), and the glass emissivity is 0.92 .
- The glass cover temperature, \( \mathrm{T}_{\mathrm{g}}=32.6^{\circ} \mathrm{C}=305.6 \mathrm{~K} \) is assumed.
82

Problem 3.10
- A parabolic trough collector has a tubular steel receiver with a glass cover and the space between the receiver and the glass is evacuated. The receiver is 10 m long and has an outside diameter of 5 cm and an inside diameter of 4 cm . The glass cover diameter is 8 cm . If the receiver surface is selective with εr=0.11 and is at 250^∘C, determine the overall heat loss coefficient of the receiver when environmental temperature is 24^∘C, the wind speed is 2 m / s, and the glass emissivity is 0.92 .
- The glass cover temperature, Tg=32.6^∘C=305.6 K is assumed.
82

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