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The condenser of a large steam power plant is a shell-and-tube heat exchanger having a single shell and 30,000 tubes, with each tube making two passes. The tubes are thin-walled with 25 mm diameter and steam condenses on the outside of the tube with ho= 11kW.m2-K. The cooling water flowing through the tubes at a rate of 30,000 kg/s and the heat transfer rate is 2 GW. Water enters at 20oC while steam condenses at 50oC. Find the length of the tubes in one pass, properties of water at are
cp = 4.18 kj/kg-K, μ = 855 x 10-6 N-s/m2
K = 0.613 W/m-K and Pr = 5.83.
Given that for laminar flow through pipes corresponding Nusselt number is 4.0 and for turbulent flow,
it is Nu = 0.023 Pr0.4.
(B) 4.55
    Correct answer is between ','. Can you explain this answer?
    Verified Answer
    The condenser of a large steam power plant is a shell-and-tube heat e...
    Q = mccpc (Tc2 - Tc1) = 2 x 109 W
    Tc2 - 20 = 2 x 109/30000 x 4.18 = 16
    ∴ Tc2 = 36oC
    Aslo, Q = UA(θm)cf
    Where A = N x πD(2L),
    L = length of one tube pass
    ReD = Vdp/μ = 4m/πDμ
    = 4 x 1 kg/s / 3.14 x 0.02 m x 855 x 10-6 Ns/m2
    = 59567
    The flow is turbulent,
    ∴ NuD = 0.023 ReD0.8 Pr 0.4
    = 0.023(59567)0.8(5.83)0.4 = 308
    hiD/k = 308
    hi = 308 x 0.613/0.025 = 7552 W/m2 K
    1/U = 1/hi + 1/ho = 1/7552 + 1/11000
    U = 4478 W/m2 K
    m)cf = = 21oC
    L = Q / U x (N x ?D x 2 )(θm)cf
    = 2 x 109 / 4478 x 30000 x 2 x ? x 0.025 x 21
    = 4.51
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    The condenser of a large steam power plant is a shell-and-tube heat e...
    Q = mccpc (Tc2 - Tc1) = 2 x 109 W
    Tc2 - 20 = 2 x 109/30000 x 4.18 = 16
    ∴ Tc2 = 36oC
    Aslo, Q = UA(θm)cf
    Where A = N x πD(2L),
    L = length of one tube pass
    ReD = Vdp/μ = 4m/πDμ
    = 4 x 1 kg/s / 3.14 x 0.02 m x 855 x 10-6 Ns/m2
    = 59567
    The flow is turbulent,
    ∴ NuD = 0.023 ReD0.8 Pr 0.4
    = 0.023(59567)0.8(5.83)0.4 = 308
    hiD/k = 308
    hi = 308 x 0.613/0.025 = 7552 W/m2 K
    1/U = 1/hi + 1/ho = 1/7552 + 1/11000
    U = 4478 W/m2 K
    m)cf = = 21oC
    L = Q / U x (N x ?D x 2 )(θm)cf
    = 2 x 109 / 4478 x 30000 x 2 x ? x 0.025 x 21
    = 4.51
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    Community Answer
    The condenser of a large steam power plant is a shell-and-tube heat e...
    Q = mccpc (Tc2 - Tc1) = 2 x 109 W
    Tc2 - 20 = 2 x 109/30000 x 4.18 = 16
    ∴ Tc2 = 36oC
    Aslo, Q = UA(θm)cf
    Where A = N x πD(2L),
    L = length of one tube pass
    ReD = Vdp/μ = 4m/πDμ
    = 4 x 1 kg/s / 3.14 x 0.02 m x 855 x 10-6 Ns/m2
    = 59567
    The flow is turbulent,
    ∴ NuD = 0.023 ReD0.8 Pr 0.4
    = 0.023(59567)0.8(5.83)0.4 = 308
    hiD/k = 308
    hi = 308 x 0.613/0.025 = 7552 W/m2 K
    1/U = 1/hi + 1/ho = 1/7552 + 1/11000
    U = 4478 W/m2 K
    m)cf = = 21oC
    L = Q / U x (N x ?D x 2 )(θm)cf
    = 2 x 109 / 4478 x 30000 x 2 x ? x 0.025 x 21
    = 4.51
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    The condenser of a large steam power plant is a shell-and-tube heat exchanger having a single shell and 30,000 tubes, with each tube making two passes. The tubes are thin-walled with 25 mm diameter and steam condenses on the outside of the tube with ho= 11kW.m2-K. The cooling water flowing through the tubes at a rate of 30,000 kg/s and the heat transfer rate is 2 GW. Water enters at 20oC while steam condenses at 50oC. Find the length of the tubes in one pass, properties of water at arecp = 4.18 kj/kg-K, μ = 855 x 10-6 N-s/m2K = 0.613 W/m-K and Pr = 5.83.Given that for laminar flow through pipes corresponding Nusselt number is 4.0 and for turbulent flow,it is Nu = 0.023 Pr0.4.(B) 4.55Correct answer is between ','. Can you explain this answer?
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    The condenser of a large steam power plant is a shell-and-tube heat exchanger having a single shell and 30,000 tubes, with each tube making two passes. The tubes are thin-walled with 25 mm diameter and steam condenses on the outside of the tube with ho= 11kW.m2-K. The cooling water flowing through the tubes at a rate of 30,000 kg/s and the heat transfer rate is 2 GW. Water enters at 20oC while steam condenses at 50oC. Find the length of the tubes in one pass, properties of water at arecp = 4.18 kj/kg-K, μ = 855 x 10-6 N-s/m2K = 0.613 W/m-K and Pr = 5.83.Given that for laminar flow through pipes corresponding Nusselt number is 4.0 and for turbulent flow,it is Nu = 0.023 Pr0.4.(B) 4.55Correct answer is between ','. 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 The condenser of a large steam power plant is a shell-and-tube heat exchanger having a single shell and 30,000 tubes, with each tube making two passes. The tubes are thin-walled with 25 mm diameter and steam condenses on the outside of the tube with ho= 11kW.m2-K. The cooling water flowing through the tubes at a rate of 30,000 kg/s and the heat transfer rate is 2 GW. Water enters at 20oC while steam condenses at 50oC. Find the length of the tubes in one pass, properties of water at arecp = 4.18 kj/kg-K, μ = 855 x 10-6 N-s/m2K = 0.613 W/m-K and Pr = 5.83.Given that for laminar flow through pipes corresponding Nusselt number is 4.0 and for turbulent flow,it is Nu = 0.023 Pr0.4.(B) 4.55Correct answer is between ','. 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 The condenser of a large steam power plant is a shell-and-tube heat exchanger having a single shell and 30,000 tubes, with each tube making two passes. The tubes are thin-walled with 25 mm diameter and steam condenses on the outside of the tube with ho= 11kW.m2-K. The cooling water flowing through the tubes at a rate of 30,000 kg/s and the heat transfer rate is 2 GW. Water enters at 20oC while steam condenses at 50oC. Find the length of the tubes in one pass, properties of water at arecp = 4.18 kj/kg-K, μ = 855 x 10-6 N-s/m2K = 0.613 W/m-K and Pr = 5.83.Given that for laminar flow through pipes corresponding Nusselt number is 4.0 and for turbulent flow,it is Nu = 0.023 Pr0.4.(B) 4.55Correct answer is between ','. Can you explain this answer?.
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