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A feed of 4360 kg/h of a 20wt % NaOH solution in water at 37.8°C enters continuously a single-effect evaporator and is being concentrated to 40%. The evaporation is at a pressure of 12.349 kPa (abs) and the heat transfer coefficient is 1560 W/(m²K). Saturated steam at 232.1 kPa (abs) is supplied for heating. (vapour heat capacity is 1.884 kJ/kg/K). a) Calculate the heat transfer area and the steam economy. b) For all operation conditions remain unchanged and the heat transfer coefficient is constant, if the evaporation pressure is decreased, what will the evaporator size change? Give the justification. c) For all operation conditions remain unchanged and the heat transfer coefficient is constant, if the steam pressure is decreased, what will the evaporator size change? Given the justification

A feed of 4360 kg/h of a 20wt % NaOH solution in water at 37.8°C enters continuously a single-effect evaporator and is being concentrated to 40%. The evaporation is at a pressure of 12.349 kPa (abs) and the heat transfer coefficient is 1560 W/(m²K). Saturated steam at 232.1 kPa (abs) is supplied for heating. (vapour heat capacity is 1.884 kJ/kg/K). a) Calculate the heat transfer area and the steam economy. b) For all operation conditions remain unchanged and the heat transfer coefficient is constant, if the evaporation pressure is decreased, what will the evaporator size change? Give the justification. c) For all operation conditions remain unchanged and the heat transfer coefficient is constant, if the steam pressure is decreased, what will the evaporator size change? Given the justification

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Please answer the whole question 3 a - b - v 

Question 3 A feed of 4360 kg/h of a 20wt % NaOH solution in water at 37.8°C enters continuously a single-effect evaporator and is being concentrated to 40%. The evaporation is at a pressure of 12.349 kPa (abs) and the heat transfer coefficient is 1560 W/(m²K). Saturated steam at 232.1 kPa (abs) is supplied for heating. (vapour heat capacity is 1.884 kJ/kg/K). a) b) Calculate the heat transfer area and the steam economy. For all operation conditions remain unchanged and the heat transfer coefficient is constant, if the evaporation pressure is decreased, what will the evaporator size change? Give the justification. c) For all operation conditions remain unchanged and the heat transfer coefficient is constant, if the steam pressure is decreased, what will the evaporator size change? Given the justification
Transcribed Image Text:Question 3 A feed of 4360 kg/h of a 20wt % NaOH solution in water at 37.8°C enters continuously a single-effect evaporator and is being concentrated to 40%. The evaporation is at a pressure of 12.349 kPa (abs) and the heat transfer coefficient is 1560 W/(m²K). Saturated steam at 232.1 kPa (abs) is supplied for heating. (vapour heat capacity is 1.884 kJ/kg/K). a) b) Calculate the heat transfer area and the steam economy. For all operation conditions remain unchanged and the heat transfer coefficient is constant, if the evaporation pressure is decreased, what will the evaporator size change? Give the justification. c) For all operation conditions remain unchanged and the heat transfer coefficient is constant, if the steam pressure is decreased, what will the evaporator size change? Given the justification
A.2-9 Properties of Saturated Steam and Water (Steam Table), SI Units Specific Volume (m²/kg) Temper- Vapor ature Pressure (°C) (kPa) 0.01 3 69NEREZONASIN 12 15 18 21 24 25 27 30 33 36 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 '140 145 150 155 160 165 170 175 180 190 200 225 250 275 300 120.82 143.27 169.06 198.53 232.1 270.1 313.0 316.3 415.4 475.8 543.1 617.8 700.5 791.7 892.0 1002.1 1254.4 1553.8 2548 3973 5942 8581 Sat'd Vapor 0.0013168 0.0010436 Enthalpy (kJ/kg) Liquid Sat'd Vapor Liquid 0.0010002 206.136 0.00 2501.4 0.0000 9.1562 12.57 2506.9 0.0457 9.0773 25.20 2512.4 0.0912 9.0003 8.8524 37.80 2517.9 0.1362 8.9253 50.41 2523.4 0.1806 62.99 2528.9 0.2245 75.58 2534.4 0.2679 88.14 2539.9 8.7814 8.7123 0.3109 8.6450 100.70 2545.4 0.3534 8.5794 104.89 2547.2 0.3674 0.6113 0.7577 0.0010001 168.132 0.9349 0.0010001 137.734 1.1477 0.0010003 113.386 1.4022 0.0010005 93.784 1.7051 0.0010009 77.926 2.0640 0.0010014 65.038 2.487 0.0010020 54.514 2.985 0.0010027 45.883 3.169 0.0010029 43.360 3.567 0.0010035 38.774 4.246 0.0010043 32.894 5.034 0.0010053 28.011 5.947 0.0010063 23.940 7.384 0.0010078 19.523 9.593 0.0010099 15.258 12.349 0.0010121 12.032 9.568 7.671 6.197 5.042 113.25 2550.8 0.3954 125.79 2556.3 0.4369 138.33 2561.7 0.4781 2567.1 0.5188 15.758 19.940 0.0010146 0.0010172 150.86 167.57 2574.3 0.5725 188.45 2583.2 0.6387 209.33 2592.1 0.7038 230.23 2600.9 0.7679 251.13 2609.6 0.8312 272.06 2618.3 0.8935 292.98 2626.8 0.9549 313.93 2635.3 1.0155 25.03 0.0010199 31.19 0.0010228 38.58 0.0010259 4.131 3.407 47.39 0.0010291 334.91 2643.7 1.0753 57.83 0.0010325 2.828 355.90 2651.9 1.1343 70.14 0.0010360 2.361 376.92 2660.1 1.1925 84.55 0.0010397 1.9819 397.96 2668.1 1.2500 101.35 0.0010435 1.6729 419.04 2676.1 1.3069 0.0010475 1.4194 440.15 2683.8 1.3630 0.0010516 1.2102 461.30 2691.5 1.4185 0.0010559 1.0366 482.48 2699.0 1.4734 7.1833 0.0010603 503.71 2706.3 1.5276 7.1296 0.0010649 0.8919 0.7706 0.6685 524.99 2713.5 1.5813 7.0775 0.0010697 546.31 2720.5 1.6344 7.0269 0.0010746 0.5822 567.69 2727.3 1.6870 6.9777 0.0010797 0.5089 589.13 2733.9 1.7391 6.9299 0.0010850 610.63 2740.3 1.7907 6.8833 0.0010905 632.20 2746.5 1.8418 6.8379 0.0010961 653.84 2752.4 1.8925 6.7935 0.4463 0.3928 0.3468 0.3071 0.2727 0.2428 0.0011020 675.55 2758.1 1.9427 6.7502 0.0011080 697.34 2763.5 1.9925 6.7078 0.0011143 719.21 2768.7 2.0419 6.6663 0.0011207 0.2168 741.17 2773.6 2.0909 6.6256 0.0011274 0.19405 763.22 2778.2 2.1396 6.5857 0.0011414 0.15654 0.0011565 0.12736 0.0011992 807.62 2786.4 2.2359 6.5079 852.45 2793.2 2.3309 6.4323 966.78 2803.3 2.5639 6.2503 1085.36 2801.5 2.7927 6.0730 5.8938 0.07849 0.05013 0.03279 1210.07 2785.0 3.0208 0.02167 1344.0 2749.0 3.2534 0.0012512 5.7045 Liquid Entropy (kJ/kg-K) Sat'd Vapor 8.5580 8.5156 8.4533 8.3927 8.3336 8.2570 8.1648 8.0763 7.9913 7.9096- 7.8310 7.7553 7.6824 7.6122 7.5445 7.4791. 7.4159 7.3549 7.2958 7.2387 Source: Abridged from I. H. Keenan, F. G. Keyes, P. G. Hill, and J. G. Moore, Steam Tables-Metric Units. New York: John Wiley & Sons, Inc., 1969. Reprinted by permission of John Wiley & Sons, Inc.
Transcribed Image Text:A.2-9 Properties of Saturated Steam and Water (Steam Table), SI Units Specific Volume (m²/kg) Temper- Vapor ature Pressure (°C) (kPa) 0.01 3 69NEREZONASIN 12 15 18 21 24 25 27 30 33 36 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 '140 145 150 155 160 165 170 175 180 190 200 225 250 275 300 120.82 143.27 169.06 198.53 232.1 270.1 313.0 316.3 415.4 475.8 543.1 617.8 700.5 791.7 892.0 1002.1 1254.4 1553.8 2548 3973 5942 8581 Sat'd Vapor 0.0013168 0.0010436 Enthalpy (kJ/kg) Liquid Sat'd Vapor Liquid 0.0010002 206.136 0.00 2501.4 0.0000 9.1562 12.57 2506.9 0.0457 9.0773 25.20 2512.4 0.0912 9.0003 8.8524 37.80 2517.9 0.1362 8.9253 50.41 2523.4 0.1806 62.99 2528.9 0.2245 75.58 2534.4 0.2679 88.14 2539.9 8.7814 8.7123 0.3109 8.6450 100.70 2545.4 0.3534 8.5794 104.89 2547.2 0.3674 0.6113 0.7577 0.0010001 168.132 0.9349 0.0010001 137.734 1.1477 0.0010003 113.386 1.4022 0.0010005 93.784 1.7051 0.0010009 77.926 2.0640 0.0010014 65.038 2.487 0.0010020 54.514 2.985 0.0010027 45.883 3.169 0.0010029 43.360 3.567 0.0010035 38.774 4.246 0.0010043 32.894 5.034 0.0010053 28.011 5.947 0.0010063 23.940 7.384 0.0010078 19.523 9.593 0.0010099 15.258 12.349 0.0010121 12.032 9.568 7.671 6.197 5.042 113.25 2550.8 0.3954 125.79 2556.3 0.4369 138.33 2561.7 0.4781 2567.1 0.5188 15.758 19.940 0.0010146 0.0010172 150.86 167.57 2574.3 0.5725 188.45 2583.2 0.6387 209.33 2592.1 0.7038 230.23 2600.9 0.7679 251.13 2609.6 0.8312 272.06 2618.3 0.8935 292.98 2626.8 0.9549 313.93 2635.3 1.0155 25.03 0.0010199 31.19 0.0010228 38.58 0.0010259 4.131 3.407 47.39 0.0010291 334.91 2643.7 1.0753 57.83 0.0010325 2.828 355.90 2651.9 1.1343 70.14 0.0010360 2.361 376.92 2660.1 1.1925 84.55 0.0010397 1.9819 397.96 2668.1 1.2500 101.35 0.0010435 1.6729 419.04 2676.1 1.3069 0.0010475 1.4194 440.15 2683.8 1.3630 0.0010516 1.2102 461.30 2691.5 1.4185 0.0010559 1.0366 482.48 2699.0 1.4734 7.1833 0.0010603 503.71 2706.3 1.5276 7.1296 0.0010649 0.8919 0.7706 0.6685 524.99 2713.5 1.5813 7.0775 0.0010697 546.31 2720.5 1.6344 7.0269 0.0010746 0.5822 567.69 2727.3 1.6870 6.9777 0.0010797 0.5089 589.13 2733.9 1.7391 6.9299 0.0010850 610.63 2740.3 1.7907 6.8833 0.0010905 632.20 2746.5 1.8418 6.8379 0.0010961 653.84 2752.4 1.8925 6.7935 0.4463 0.3928 0.3468 0.3071 0.2727 0.2428 0.0011020 675.55 2758.1 1.9427 6.7502 0.0011080 697.34 2763.5 1.9925 6.7078 0.0011143 719.21 2768.7 2.0419 6.6663 0.0011207 0.2168 741.17 2773.6 2.0909 6.6256 0.0011274 0.19405 763.22 2778.2 2.1396 6.5857 0.0011414 0.15654 0.0011565 0.12736 0.0011992 807.62 2786.4 2.2359 6.5079 852.45 2793.2 2.3309 6.4323 966.78 2803.3 2.5639 6.2503 1085.36 2801.5 2.7927 6.0730 5.8938 0.07849 0.05013 0.03279 1210.07 2785.0 3.0208 0.02167 1344.0 2749.0 3.2534 0.0012512 5.7045 Liquid Entropy (kJ/kg-K) Sat'd Vapor 8.5580 8.5156 8.4533 8.3927 8.3336 8.2570 8.1648 8.0763 7.9913 7.9096- 7.8310 7.7553 7.6824 7.6122 7.5445 7.4791. 7.4159 7.3549 7.2958 7.2387 Source: Abridged from I. H. Keenan, F. G. Keyes, P. G. Hill, and J. G. Moore, Steam Tables-Metric Units. New York: John Wiley & Sons, Inc., 1969. Reprinted by permission of John Wiley & Sons, Inc.
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