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3-37E A spring-loaded piston-cylinder device is initially filled with 0.2 lbm of an R-134a liquid-vapor mixture whose temperature is -30°F and whose quality is 80 percent. The spring constant in the spring force relation F= kx is 37 lbf/in, and the piston diameter is 12 in. The R-134a undergoes a process that increases its volume by 40 percent. Calculate the final temperature and enthalpy of the R-134a. Answers: 81.5°F, 120 Btu/lbm W Fluid -D- FIGURE P3-37E Spring

3-37E A spring-loaded piston-cylinder device is initially filled with 0.2 lbm of an R-134a liquid-vapor mixture whose temperature is -30°F and whose quality is 80 percent. The spring constant in the spring force relation F= kx is 37 lbf/in, and the piston diameter is 12 in. The R-134a undergoes a process that increases its volume by 40 percent. Calculate the final temperature and enthalpy of the R-134a. Answers: 81.5°F, 120 Btu/lbm W Fluid -D- FIGURE P3-37E Spring

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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3-37E A spring-loaded piston-cylinder device is initially filled with 0.2 lbm of an R-134a liquid-vapor mixture whose temperature is -30°F and whose quality is 80 percent. The spring constant in the spring force relation F = kx is 37 lbf/in, and the piston diameter is 12 in. The R-134a undergoes a process that increases its volume by 40 percent. Calculate the final temperature and enthalpy of the R-134a. Answers: 81.5°F, 120 Btu/lbm www. Fluid FIGURE P3-37E -Spring
Transcribed Image Text:3-37E A spring-loaded piston-cylinder device is initially filled with 0.2 lbm of an R-134a liquid-vapor mixture whose temperature is -30°F and whose quality is 80 percent. The spring constant in the spring force relation F = kx is 37 lbf/in, and the piston diameter is 12 in. The R-134a undergoes a process that increases its volume by 40 percent. Calculate the final temperature and enthalpy of the R-134a. Answers: 81.5°F, 120 Btu/lbm www. Fluid FIGURE P3-37E -Spring
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This is the only Superheated R-134a property table we are given, how do we find the final state of R-134a the superheated state from here?

 

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978 PROPERTY TABLES AND CHARTS TABLE A-13E Superheated refrigerant-134a T °F S Btul V h ft³/lbm Btu/lbm Btu/lbm 1bm-R P-10 psia (Tt - -29.52°F) Sat. 4.3753 90.59 98.68 0.22948 -20 4.4856 92.13 100.43 0.23350 0 4.7135 95.41 104.14 0.24174 20 4.9380 98.77 107.91 0.24976 40 5.1600 102.20 111.75 0.25761 60 5.3802 105.72 115.67 0.26531 80 5.5989 109.32 119.68 0.27288 100 5.8165 113.01 123.78 0.28033 120 6.0331 116.79 127.96 0.28767 140 6.2490 120.66 132.22 0.29490 160 6.4642 124.61 136.57 0.30203 180 6.6789 128.65 141.01 0.30908 200 6.8930 132.77 145.53 0.31604 220 7.1068 136.98 150.13 0.32292 P-30 psia (7₁-15.37°F) Sat. 1.5492 96.72 105.32 0.22383 20 1.5691 97.56 106.27 0.22581 40 1.6528 101.17 110.35 0.23414 60 1.7338 104.82 114.45 0.24219 80 1.8130 108.53 118.59 0.25002 100 1.8908 112.30 122.80 0.25767 120 1.9675 116.15 127.07 0.26517 140 2.0434 120.08 131.42 0.27254 160 2.1185 124.08 135.84 0.27979 180 2.1931 128.16 140.34 0.28693 200 2.2671 132.32 144.91 0.29398 220 2.3408 136.57 149.56 0.30092 240 2.4141 140.89 154.29 0.30778 260 2.4871 145.30 159.10 0.31456 280 2.5598 149.78 163.99 0.32126 P-60 psia (T- 49.84°F) Sat. 0.7936 101.30 110.11 0.22127 60 0.8179 103.31 112.39 0.22570 80 0.8636 107.23 116.82 0.23407 100 0.9072 111.16 121.24 0.24211 120 0.9495 115.14 125.68 0.24991 140 0.9908 119.16 130.16 0.25751 160 1.0312 123.25 134.70 0.26496 180 1.0709 127.41 139.30 0.27226 200 1.1101 131.63 143.96 0.27943 220 1.1489 135.93 148.69 0.28649 240 1.1872 140.30 153.48 0.29344 260 1.2252 144.75 158.35 0.30030 280 1.2629 149.27 163.29 0.30707 300 1.3004 153.87 168.31 0.31376 320 1.3377 158.54 173.39 0.32037 Btu/ V h ft³/lbm Btu/bm Btu/lbm 1bm-R P-15 psia (T--14.15°F) 2.9880 92.70 100.99 0.22715 3.1001 95.08 103.68 0.23310 3.2551 98.48 107.52 0.24127 3.4074 101.95 111.41 0.24922 3.5577 105.50 115.38 0.25700 3.7064 109.13 119.42 0.26463 3.8540 112.84 123.54 0.27212 4.0006 116.63 127.74 0.27950 4.1464 120.51 132.02 0.28677 4.2915 124.48 136.39 0.29393 4.4361 128.53 140.84 0.30100 4.5802 132.66 145.37 0.30798 4.7239 136.88 149.99 0.31487 P-40 psia (T- 29.01°F) 1.1760 98.55 107.26 0.22268 1.2126 100.61 109.58 0.22738 1.2768 104.34 113.79 0.23565 1.3389 108.11 118.02 0.24363 1.3995 111.93 122.29 0.25140 1.4588 115.82 126.62 0.25900 1.5173 119.78 131.01 0.26644 1.5750 123.81 135.47 0.27375 1.6321 127.91 140.00 0.28095 1.6887 132.10 144.60 0.28803 1.7449 136.36 149.27 0.29501 1.8007 140.70 154.03 0.30190 1.8562 145.12 158.86 0.30871 1.9114 149.61 163.76 0.31543 P-70 psia (T-58.30°F) 0.6821 102.39 111.22 0.22080 0.6857 102.73 111.62 0.22155 0.7271 106.76 116.18 0.23016 0.7662 110.76 120.68 0.23836 0.8037 114.78 125.19 0.24628 0.8401 118.85 129.73 0.25398 0.8756 122.97 134.31 0.26149 0.9105 127.15 138.94 0.26885 0.9447 131.40 143.63 0.27607 0.9785 135.71 148.39 0.28317 1.0118 140.10 153.21 0.29015 1.0449 144.56 158.10 0.29704 1.0776 149.10 163.06 0.30384 1.1101 153.71 168.09 0.31055 1.1424 158.39 173.19 0.31718 V U h Btu/ ft³/lbm Btu/bm Btu/lbm lbm-R P - 20 psia (T- -2.43°F) 2.2772 94.30 102.73 0.22567 2.2922 94.72 103.20 0.22671 2.4130 98.19 107.12 0.23504 2.5306 101.70 111.07 0.24311 2.6461 105.28 115.07 0.25097 2.7600 108.93 119.15 0.25866 2.8726 112.66 123.29 0.26621 2.9842 116.47 127.52 0.27363 3.0950 120.37 131.82 0.28093 3.2051 124.35 136.21 0.28812 3.3146 128.41 140.67 0.29521 3.4237 132.55 145.22 0.30221 3.5324 136.78 149.85 0.30912 P- 50 psia (Tat - 40.23°F) 0.9479 100.04 108.81 0.22188 1.0019 103.84 113.11 0.23031 1.0540 107.68 117.43 0.23847 1.1043 111.55 121.77 0.24637 1.1534 115.48 126.16 0.25406 1.2015 119.47 130.59 0.26159 1.2488 123.53 135.09 0.26896 1.2955 127.66 139.65 0.27621 1.3416 131.87 144.28 0.28333 1.3873 136.15 148.98 0.29036 1.4326 140.50 153.76 0.29728 1.4776 144.93 158.60 0.30411 1.5223 149.44 163.53 0.31086 P- 80 psia (Ta - 65.89°F) 0.59750 103.35 112.20 0.22040 0.62430 106.26 115.51 0.22661 0.66009 110.34 120.11 0.23499 0.69415 114.42 124.69 0.24304 0.72698 118.52 129.29 0.25083 0.75888 122.68 133.91 0.25841 0.79003 126.89 138.58 0.26583 0.82059 131.16 143.31 0.27310 0.85065 135.49 148.09 0.28024 0.88030 139.90 152.93 0.28726 0.90961 144.37 157.84 0.29418 0.93861 148.92 162.82 0.30100 0.96737 153.54 167.86 0.30773 0.99590 158.24 172.98 0.31438
Transcribed Image Text:978 PROPERTY TABLES AND CHARTS TABLE A-13E Superheated refrigerant-134a T °F S Btul V h ft³/lbm Btu/lbm Btu/lbm 1bm-R P-10 psia (Tt - -29.52°F) Sat. 4.3753 90.59 98.68 0.22948 -20 4.4856 92.13 100.43 0.23350 0 4.7135 95.41 104.14 0.24174 20 4.9380 98.77 107.91 0.24976 40 5.1600 102.20 111.75 0.25761 60 5.3802 105.72 115.67 0.26531 80 5.5989 109.32 119.68 0.27288 100 5.8165 113.01 123.78 0.28033 120 6.0331 116.79 127.96 0.28767 140 6.2490 120.66 132.22 0.29490 160 6.4642 124.61 136.57 0.30203 180 6.6789 128.65 141.01 0.30908 200 6.8930 132.77 145.53 0.31604 220 7.1068 136.98 150.13 0.32292 P-30 psia (7₁-15.37°F) Sat. 1.5492 96.72 105.32 0.22383 20 1.5691 97.56 106.27 0.22581 40 1.6528 101.17 110.35 0.23414 60 1.7338 104.82 114.45 0.24219 80 1.8130 108.53 118.59 0.25002 100 1.8908 112.30 122.80 0.25767 120 1.9675 116.15 127.07 0.26517 140 2.0434 120.08 131.42 0.27254 160 2.1185 124.08 135.84 0.27979 180 2.1931 128.16 140.34 0.28693 200 2.2671 132.32 144.91 0.29398 220 2.3408 136.57 149.56 0.30092 240 2.4141 140.89 154.29 0.30778 260 2.4871 145.30 159.10 0.31456 280 2.5598 149.78 163.99 0.32126 P-60 psia (T- 49.84°F) Sat. 0.7936 101.30 110.11 0.22127 60 0.8179 103.31 112.39 0.22570 80 0.8636 107.23 116.82 0.23407 100 0.9072 111.16 121.24 0.24211 120 0.9495 115.14 125.68 0.24991 140 0.9908 119.16 130.16 0.25751 160 1.0312 123.25 134.70 0.26496 180 1.0709 127.41 139.30 0.27226 200 1.1101 131.63 143.96 0.27943 220 1.1489 135.93 148.69 0.28649 240 1.1872 140.30 153.48 0.29344 260 1.2252 144.75 158.35 0.30030 280 1.2629 149.27 163.29 0.30707 300 1.3004 153.87 168.31 0.31376 320 1.3377 158.54 173.39 0.32037 Btu/ V h ft³/lbm Btu/bm Btu/lbm 1bm-R P-15 psia (T--14.15°F) 2.9880 92.70 100.99 0.22715 3.1001 95.08 103.68 0.23310 3.2551 98.48 107.52 0.24127 3.4074 101.95 111.41 0.24922 3.5577 105.50 115.38 0.25700 3.7064 109.13 119.42 0.26463 3.8540 112.84 123.54 0.27212 4.0006 116.63 127.74 0.27950 4.1464 120.51 132.02 0.28677 4.2915 124.48 136.39 0.29393 4.4361 128.53 140.84 0.30100 4.5802 132.66 145.37 0.30798 4.7239 136.88 149.99 0.31487 P-40 psia (T- 29.01°F) 1.1760 98.55 107.26 0.22268 1.2126 100.61 109.58 0.22738 1.2768 104.34 113.79 0.23565 1.3389 108.11 118.02 0.24363 1.3995 111.93 122.29 0.25140 1.4588 115.82 126.62 0.25900 1.5173 119.78 131.01 0.26644 1.5750 123.81 135.47 0.27375 1.6321 127.91 140.00 0.28095 1.6887 132.10 144.60 0.28803 1.7449 136.36 149.27 0.29501 1.8007 140.70 154.03 0.30190 1.8562 145.12 158.86 0.30871 1.9114 149.61 163.76 0.31543 P-70 psia (T-58.30°F) 0.6821 102.39 111.22 0.22080 0.6857 102.73 111.62 0.22155 0.7271 106.76 116.18 0.23016 0.7662 110.76 120.68 0.23836 0.8037 114.78 125.19 0.24628 0.8401 118.85 129.73 0.25398 0.8756 122.97 134.31 0.26149 0.9105 127.15 138.94 0.26885 0.9447 131.40 143.63 0.27607 0.9785 135.71 148.39 0.28317 1.0118 140.10 153.21 0.29015 1.0449 144.56 158.10 0.29704 1.0776 149.10 163.06 0.30384 1.1101 153.71 168.09 0.31055 1.1424 158.39 173.19 0.31718 V U h Btu/ ft³/lbm Btu/bm Btu/lbm lbm-R P - 20 psia (T- -2.43°F) 2.2772 94.30 102.73 0.22567 2.2922 94.72 103.20 0.22671 2.4130 98.19 107.12 0.23504 2.5306 101.70 111.07 0.24311 2.6461 105.28 115.07 0.25097 2.7600 108.93 119.15 0.25866 2.8726 112.66 123.29 0.26621 2.9842 116.47 127.52 0.27363 3.0950 120.37 131.82 0.28093 3.2051 124.35 136.21 0.28812 3.3146 128.41 140.67 0.29521 3.4237 132.55 145.22 0.30221 3.5324 136.78 149.85 0.30912 P- 50 psia (Tat - 40.23°F) 0.9479 100.04 108.81 0.22188 1.0019 103.84 113.11 0.23031 1.0540 107.68 117.43 0.23847 1.1043 111.55 121.77 0.24637 1.1534 115.48 126.16 0.25406 1.2015 119.47 130.59 0.26159 1.2488 123.53 135.09 0.26896 1.2955 127.66 139.65 0.27621 1.3416 131.87 144.28 0.28333 1.3873 136.15 148.98 0.29036 1.4326 140.50 153.76 0.29728 1.4776 144.93 158.60 0.30411 1.5223 149.44 163.53 0.31086 P- 80 psia (Ta - 65.89°F) 0.59750 103.35 112.20 0.22040 0.62430 106.26 115.51 0.22661 0.66009 110.34 120.11 0.23499 0.69415 114.42 124.69 0.24304 0.72698 118.52 129.29 0.25083 0.75888 122.68 133.91 0.25841 0.79003 126.89 138.58 0.26583 0.82059 131.16 143.31 0.27310 0.85065 135.49 148.09 0.28024 0.88030 139.90 152.93 0.28726 0.90961 144.37 157.84 0.29418 0.93861 148.92 162.82 0.30100 0.96737 153.54 167.86 0.30773 0.99590 158.24 172.98 0.31438
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