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A counter flow double pipe heat exchanger is to heat water from 20oC to 80oC at a rate of 1.2kg/s. The heating is to be accomplished by geo-thermal water available at 160oC at a mass flow rate of 2 kg/s. The inner tube is thin-walled and has a diameter of 1.5 cm. The overall heat transfer coefficient of the heat exchanger is 620 W/m2-K . Determine the length of the heat exchanger required to achieve the desired heating. Given
NTU = specific heat of water is 4.18 Kj/kg-K and for geothermal water is 4.31 Kj/kg-K.
(B)110.0
    Correct answer is between ','. Can you explain this answer?
    Verified Answer
    A counter flow double pipe heat exchanger is to heat water from 20oC ...
    The capacity rates are,
    Ch = mhcph = 2 x 4.31 = 8.62 W/K
    Ch = mhcph = 1.2 x 4018 = 5.02 kW/K
    ∴ C = Cmin/Cmax = 5.02/8.62 = 0.582
    ∴ Qact = mccpc [Tce - Tci]
    = 1.2 x 4.18(80-20)
    = 301 kW
    Qmax = Cmin (Thi - Tci)
    = 5.02(160 - 20)
    = 702.8 kW
    ∴ ε Qact/Qmax = 301/702.8 = 0.428
    ⇒ NTU = 0.651
    ⇒ UA/Cmin = 0.651
    ⇒ A = 5.11 m2
    Now A = πDL
    ⇒ L = A/πD = 5.11/3.14 x 0.015
    ⇒ L = 108 m
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    Most Upvoted Answer
    A counter flow double pipe heat exchanger is to heat water from 20oC ...
    The capacity rates are,
    Ch = mhcph = 2 x 4.31 = 8.62 W/K
    Ch = mhcph = 1.2 x 4018 = 5.02 kW/K
    ∴ C = Cmin/Cmax = 5.02/8.62 = 0.582
    ∴ Qact = mccpc [Tce - Tci]
    = 1.2 x 4.18(80-20)
    = 301 kW
    Qmax = Cmin (Thi - Tci)
    = 5.02(160 - 20)
    = 702.8 kW
    ∴ ε Qact/Qmax = 301/702.8 = 0.428
    ⇒ NTU = 0.651
    ⇒ UA/Cmin = 0.651
    ⇒ A = 5.11 m2
    Now A = πDL
    ⇒ L = A/πD = 5.11/3.14 x 0.015
    ⇒ L = 108 m
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    Community Answer
    A counter flow double pipe heat exchanger is to heat water from 20oC ...
    The capacity rates are,
    Ch = mhcph = 2 x 4.31 = 8.62 W/K
    Ch = mhcph = 1.2 x 4018 = 5.02 kW/K
    ∴ C = Cmin/Cmax = 5.02/8.62 = 0.582
    ∴ Qact = mccpc [Tce - Tci]
    = 1.2 x 4.18(80-20)
    = 301 kW
    Qmax = Cmin (Thi - Tci)
    = 5.02(160 - 20)
    = 702.8 kW
    ∴ ε Qact/Qmax = 301/702.8 = 0.428
    ⇒ NTU = 0.651
    ⇒ UA/Cmin = 0.651
    ⇒ A = 5.11 m2
    Now A = πDL
    ⇒ L = A/πD = 5.11/3.14 x 0.015
    ⇒ L = 108 m
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    A counter flow double pipe heat exchanger is to heat water from 20oC to 80oC at a rate of 1.2kg/s. The heating is to be accomplished by geo-thermal water available at 160oC at a mass flow rate of 2 kg/s. The inner tube is thin-walled and has a diameter of 1.5 cm. The overall heat transfer coefficient of the heat exchanger is 620 W/m2-K . Determine the length of the heat exchanger required to achieve the desired heating. GivenNTU = specific heat of water is 4.18 Kj/kg-K and for geothermal water is 4.31 Kj/kg-K.(B)110.0Correct answer is between ','. Can you explain this answer?
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    A counter flow double pipe heat exchanger is to heat water from 20oC to 80oC at a rate of 1.2kg/s. The heating is to be accomplished by geo-thermal water available at 160oC at a mass flow rate of 2 kg/s. The inner tube is thin-walled and has a diameter of 1.5 cm. The overall heat transfer coefficient of the heat exchanger is 620 W/m2-K . Determine the length of the heat exchanger required to achieve the desired heating. GivenNTU = specific heat of water is 4.18 Kj/kg-K and for geothermal water is 4.31 Kj/kg-K.(B)110.0Correct 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 A counter flow double pipe heat exchanger is to heat water from 20oC to 80oC at a rate of 1.2kg/s. The heating is to be accomplished by geo-thermal water available at 160oC at a mass flow rate of 2 kg/s. The inner tube is thin-walled and has a diameter of 1.5 cm. The overall heat transfer coefficient of the heat exchanger is 620 W/m2-K . Determine the length of the heat exchanger required to achieve the desired heating. GivenNTU = specific heat of water is 4.18 Kj/kg-K and for geothermal water is 4.31 Kj/kg-K.(B)110.0Correct 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 A counter flow double pipe heat exchanger is to heat water from 20oC to 80oC at a rate of 1.2kg/s. The heating is to be accomplished by geo-thermal water available at 160oC at a mass flow rate of 2 kg/s. The inner tube is thin-walled and has a diameter of 1.5 cm. The overall heat transfer coefficient of the heat exchanger is 620 W/m2-K . Determine the length of the heat exchanger required to achieve the desired heating. GivenNTU = specific heat of water is 4.18 Kj/kg-K and for geothermal water is 4.31 Kj/kg-K.(B)110.0Correct answer is between ','. Can you explain this answer?.
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