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A metal storage tank with planar surfaces of external area contains water at and is located inside a large enclosure with walls at 65oC . The tank is initially painted black on the outside and its emissivity is approximated to 0.95. How much percentage reduction in heat loss would occur if the outside surface of tank is coated with aluminium paint (instead of black) of emissivity 0.55? Take radiation constant
σb = 5.67 x 10-8 W/m2K4
  • a)
    58
  • b)
    42
  • c)
    29
  • d)
    21
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A metal storage tank with planar surfaces of external area contains wa...
Consider outer surface of metal tank to be 1 & inner surface of enclosure to be surface 2.
By concept of thermal circuits
As the surfaces of 1 are planar, F11 = 0
∴ F21 = 1
Also ,
A2 >> A1
∴ (Q1➝2)net = σA1ε1(T14 - T24)
∴ Q ∝ ε1
Q0.55/Q0.95 = 0.55/0.95 = 0.4211
Thus heat exchange rate decreases by 57.89 %, by painting the tank with aluminium paint.
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Most Upvoted Answer
A metal storage tank with planar surfaces of external area contains wa...
Consider outer surface of metal tank to be 1 & inner surface of enclosure to be surface 2.
By concept of thermal circuits
As the surfaces of 1 are planar, F11 = 0
∴ F21 = 1
Also ,
A2 >> A1
∴ (Q1➝2)net = σA1ε1(T14 - T24)
∴ Q ∝ ε1
Q0.55/Q0.95 = 0.55/0.95 = 0.4211
Thus heat exchange rate decreases by 57.89 %, by painting the tank with aluminium paint.
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Community Answer
A metal storage tank with planar surfaces of external area contains wa...
Consider outer surface of metal tank to be 1 & inner surface of enclosure to be surface 2.
By concept of thermal circuits
As the surfaces of 1 are planar, F11 = 0
∴ F21 = 1
Also ,
A2 >> A1
∴ (Q1➝2)net = σA1ε1(T14 - T24)
∴ Q ∝ ε1
Q0.55/Q0.95 = 0.55/0.95 = 0.4211
Thus heat exchange rate decreases by 57.89 %, by painting the tank with aluminium paint.
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A metal storage tank with planar surfaces of external area contains water at and is located inside a large enclosure with walls at 65oC . The tank is initially painted black on the outside and its emissivity is approximated to 0.95. How much percentage reduction in heat loss would occur if the outside surface of tank is coated with aluminium paint (instead of black) of emissivity 0.55? Take radiation constantσb = 5.67 x 10-8 W/m2K4a)58b)42c)29d)21Correct answer is option 'A'. Can you explain this answer?
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A metal storage tank with planar surfaces of external area contains water at and is located inside a large enclosure with walls at 65oC . The tank is initially painted black on the outside and its emissivity is approximated to 0.95. How much percentage reduction in heat loss would occur if the outside surface of tank is coated with aluminium paint (instead of black) of emissivity 0.55? Take radiation constantσb = 5.67 x 10-8 W/m2K4a)58b)42c)29d)21Correct answer is option 'A'. Can you explain this answer? for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about A metal storage tank with planar surfaces of external area contains water at and is located inside a large enclosure with walls at 65oC . The tank is initially painted black on the outside and its emissivity is approximated to 0.95. How much percentage reduction in heat loss would occur if the outside surface of tank is coated with aluminium paint (instead of black) of emissivity 0.55? Take radiation constantσb = 5.67 x 10-8 W/m2K4a)58b)42c)29d)21Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A metal storage tank with planar surfaces of external area contains water at and is located inside a large enclosure with walls at 65oC . The tank is initially painted black on the outside and its emissivity is approximated to 0.95. How much percentage reduction in heat loss would occur if the outside surface of tank is coated with aluminium paint (instead of black) of emissivity 0.55? Take radiation constantσb = 5.67 x 10-8 W/m2K4a)58b)42c)29d)21Correct answer is option 'A'. Can you explain this answer?.
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