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In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2 hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg K
- a)3.224
- b)2.224
- c)1.224
- d)0.224
Correct answer is option 'C'. Can you explain this answer?
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In a surface condenser, the water flowing through a series of tubes at...
Effectiveness = 1 – exponential [- NTU].
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In a surface condenser, the water flowing through a series of tubes at...
Given data:
- Water flow rate = 200 kg/hr
- Inlet water temperature = 15°C
- Outlet water temperature = 75°C
- Overall heat transfer coefficient = 860 k J/m2hr degree
- Saturation temperature of steam at condensing pressure = 100°C
- Latent heat of vaporization of steam = 2160 k J/kg
- Specific heat of water = 4 k J/kg K
Finding the number of transfer units:
- Number of transfer units (NTU) is given by the equation NTU = UA/Cmin
- U is the overall heat transfer coefficient, A is the heat transfer area, and Cmin is the minimum heat capacity rate of the two fluids
- Cmin in this case is the heat capacity rate of water, which is given by the equation m*Cp, where m is the mass flow rate and Cp is the specific heat of water at constant pressure
- Therefore, Cmin = 200 kg/hr * 4 k J/kg K = 800 k J/hr K
- The heat transfer area can be calculated by assuming a certain tube diameter and length, but it is not given in the problem statement
- Therefore, we cannot calculate the value of NTU
Using the log-mean temperature difference method:
- The log-mean temperature difference (LMTD) is given by the equation LMTD = (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2)
- ΔT1 is the temperature difference between the hot and cold fluids at the inlet, and ΔT2 is the temperature difference between the hot and cold fluids at the outlet
- In this case, ΔT1 = (100°C - 75°C) = 25°C and ΔT2 = (100°C - 15°C) = 85°C
- Therefore, LMTD = (25°C - 85°C) / ln(25°C / 85°C) = 46.44°C
- The heat transfer rate (Q) can be calculated by the equation Q = UA * LMTD
- Q is the amount of heat transferred per unit time, and it is equal to the product of the overall heat transfer coefficient, the heat transfer area, and the LMTD
- Therefore, Q = 860 k J/m2hr degree * A * 46.44°C
Calculating the number of transfer units using the effectiveness-NTU method:
- The effectiveness (ε) of a heat exchanger is defined as the ratio of the actual heat transfer rate to the maximum possible heat transfer rate for a given temperature difference
- The maximum possible heat transfer rate is given by the equation Qmax = Cmin * (Th,in - Tc,in), where Th,in and Tc,in are the inlet temperatures of the hot and cold fluids, respectively
- Therefore, Qmax = 800 k J/hr K * (100°C - 15°C) = 620,000 k J/hr
- The effectiveness can be expressed as ε = (Q / Qmax)
- NTU can be calculated from the equation ε = (1 - e^(-NTU)) / (1 - C)
- C is the ratio of the heat capacity rates of the two fluids, and it is equal to C = Cmin / Cmax, where Cmax is the heat capacity rate of the
- Water flow rate = 200 kg/hr
- Inlet water temperature = 15°C
- Outlet water temperature = 75°C
- Overall heat transfer coefficient = 860 k J/m2hr degree
- Saturation temperature of steam at condensing pressure = 100°C
- Latent heat of vaporization of steam = 2160 k J/kg
- Specific heat of water = 4 k J/kg K
Finding the number of transfer units:
- Number of transfer units (NTU) is given by the equation NTU = UA/Cmin
- U is the overall heat transfer coefficient, A is the heat transfer area, and Cmin is the minimum heat capacity rate of the two fluids
- Cmin in this case is the heat capacity rate of water, which is given by the equation m*Cp, where m is the mass flow rate and Cp is the specific heat of water at constant pressure
- Therefore, Cmin = 200 kg/hr * 4 k J/kg K = 800 k J/hr K
- The heat transfer area can be calculated by assuming a certain tube diameter and length, but it is not given in the problem statement
- Therefore, we cannot calculate the value of NTU
Using the log-mean temperature difference method:
- The log-mean temperature difference (LMTD) is given by the equation LMTD = (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2)
- ΔT1 is the temperature difference between the hot and cold fluids at the inlet, and ΔT2 is the temperature difference between the hot and cold fluids at the outlet
- In this case, ΔT1 = (100°C - 75°C) = 25°C and ΔT2 = (100°C - 15°C) = 85°C
- Therefore, LMTD = (25°C - 85°C) / ln(25°C / 85°C) = 46.44°C
- The heat transfer rate (Q) can be calculated by the equation Q = UA * LMTD
- Q is the amount of heat transferred per unit time, and it is equal to the product of the overall heat transfer coefficient, the heat transfer area, and the LMTD
- Therefore, Q = 860 k J/m2hr degree * A * 46.44°C
Calculating the number of transfer units using the effectiveness-NTU method:
- The effectiveness (ε) of a heat exchanger is defined as the ratio of the actual heat transfer rate to the maximum possible heat transfer rate for a given temperature difference
- The maximum possible heat transfer rate is given by the equation Qmax = Cmin * (Th,in - Tc,in), where Th,in and Tc,in are the inlet temperatures of the hot and cold fluids, respectively
- Therefore, Qmax = 800 k J/hr K * (100°C - 15°C) = 620,000 k J/hr
- The effectiveness can be expressed as ε = (Q / Qmax)
- NTU can be calculated from the equation ε = (1 - e^(-NTU)) / (1 - C)
- C is the ratio of the heat capacity rates of the two fluids, and it is equal to C = Cmin / Cmax, where Cmax is the heat capacity rate of the
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In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. Can you explain this answer?
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In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. 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 In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. 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 In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. Can you explain this answer?.
In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. 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 In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. 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 In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. Can you explain this answer?.
Solutions for In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemical Engineering.
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Here you can find the meaning of In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. Can you explain this answer?, a detailed solution for In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg Ka)3.224b)2.224c)1.224d)0.224Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Chemical Engineering tests.
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