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3. Determine the size of a spherical balloon required to lift a payload of 1360 kg. The gas to be used is helium at 101.3 kPa and 23°C. The surrounding air is at 1.012 bars and at 10 deg C. Solution : AIR 101.3 kPa 283 K WV He WAIR 101.3 kPa 296 K WVPL Answer: D= ______m

3. Determine the size of a spherical balloon required to lift a payload of 1360 kg. The gas to be used is helium at 101.3 kPa and 23°C. The surrounding air is at 1.012 bars and at 10 deg C. Solution : AIR 101.3 kPa 283 K WV He WAIR 101.3 kPa 296 K WVPL Answer: D= ______m

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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2² = Z Note: Use values of MW, Cp, Cv, etc., from the Tables provided below. Indicate your answers in this page. Show your solutions in separate pages. 2. Consider this item as REAL gases: Two hundred and fifty pounds of a mixture of 6.63.% propane 17.47% n-butane, and 75.9%-pentane is completely vaporized in a pipe still in one hour. At the outlet, the temperature anc pressure are 433 F: and 600 psia. What is the volumetric flow rate in CFS at the outlet conditions? Above % data are Xi values. Answer: cubic feet per second 1.1 Answers: (b) (c). (e) 1.0 0.9 08 0.7 0.6 0.5 0.4 0.3 1. Consider this item as ideal gas: A rigid tank containing 3 lb of gaseous mixture of nitrogen, helium and carbon dioxide, each 33.33 % by volume at 275.71 Kpaa, and 65.56 C receives 1 lb more of nitrogen with the temperature remaining at 65.56 c. For the resulting 4lb, determine (a) the gravimetric and volume analyses, (b) the pressure and (c) the molecular weight. 0.2 Note; 2.2 lbm = 1 kgm For the initial mixture, determine (d) Cp, (e) Cv, and, (f) R Answers: a) 0.1 0 0.5 Gas Nitrogen Helium Carbon Dioxide 1.0 T=1.00 1.5 N₂ Formula He TR=1.10 CO₂ 2.0 2.5 ADA TR=1.20 0 4 28 44 x (f) 3.0 (d) TR = 2.00 T = 1.50 To = 1.30 MW BAK 4.0 Reduced pressure PR X 3.5 4.5 Density (kg/m3) 1.1648 0.1663 1.8417 Legend: X Methane o Ethylene ■ Iso-pentane • n-Heptane A Nitrogen Carbon dioxide • Water Average curve based on data on hydrocarbons ▲ Ethane o Propane □n-Butane 5.0 5.5 R (Gas constant) kJ/(kg.K) 0.297 2.078 I 6.0 0.189 The physical properties of the gas are: 6.5 Cp kJ/(kg.K) 1.034 5.234 7.0 0.858 Tc Pc MW Cv kJ/(kg.K) 0.733 Propane 369.9 K 665.8 R 42.0 atm 3.153 0.66 44 3. Determine the size of a spherical balloon required to lift a payload of 1360 kg. The gas to be used is helium at 101.3 kPa and 23°C. The surrounding air is at 1.012 bars and at 10 deg C. Solution : AIR 101.3 kPa 283 K Cp/Cv=Y 1.41 1.66 Butane 425.17 K 765.31 R 37.47 atm 1.3 58 W₂ WAIR 101.3 kPa 296 K Pentane 469.8 K 845.64 R 33.3 atm WVPL Answer: D= 72 m
Transcribed Image Text:2² = Z Note: Use values of MW, Cp, Cv, etc., from the Tables provided below. Indicate your answers in this page. Show your solutions in separate pages. 2. Consider this item as REAL gases: Two hundred and fifty pounds of a mixture of 6.63.% propane 17.47% n-butane, and 75.9%-pentane is completely vaporized in a pipe still in one hour. At the outlet, the temperature anc pressure are 433 F: and 600 psia. What is the volumetric flow rate in CFS at the outlet conditions? Above % data are Xi values. Answer: cubic feet per second 1.1 Answers: (b) (c). (e) 1.0 0.9 08 0.7 0.6 0.5 0.4 0.3 1. Consider this item as ideal gas: A rigid tank containing 3 lb of gaseous mixture of nitrogen, helium and carbon dioxide, each 33.33 % by volume at 275.71 Kpaa, and 65.56 C receives 1 lb more of nitrogen with the temperature remaining at 65.56 c. For the resulting 4lb, determine (a) the gravimetric and volume analyses, (b) the pressure and (c) the molecular weight. 0.2 Note; 2.2 lbm = 1 kgm For the initial mixture, determine (d) Cp, (e) Cv, and, (f) R Answers: a) 0.1 0 0.5 Gas Nitrogen Helium Carbon Dioxide 1.0 T=1.00 1.5 N₂ Formula He TR=1.10 CO₂ 2.0 2.5 ADA TR=1.20 0 4 28 44 x (f) 3.0 (d) TR = 2.00 T = 1.50 To = 1.30 MW BAK 4.0 Reduced pressure PR X 3.5 4.5 Density (kg/m3) 1.1648 0.1663 1.8417 Legend: X Methane o Ethylene ■ Iso-pentane • n-Heptane A Nitrogen Carbon dioxide • Water Average curve based on data on hydrocarbons ▲ Ethane o Propane □n-Butane 5.0 5.5 R (Gas constant) kJ/(kg.K) 0.297 2.078 I 6.0 0.189 The physical properties of the gas are: 6.5 Cp kJ/(kg.K) 1.034 5.234 7.0 0.858 Tc Pc MW Cv kJ/(kg.K) 0.733 Propane 369.9 K 665.8 R 42.0 atm 3.153 0.66 44 3. Determine the size of a spherical balloon required to lift a payload of 1360 kg. The gas to be used is helium at 101.3 kPa and 23°C. The surrounding air is at 1.012 bars and at 10 deg C. Solution : AIR 101.3 kPa 283 K Cp/Cv=Y 1.41 1.66 Butane 425.17 K 765.31 R 37.47 atm 1.3 58 W₂ WAIR 101.3 kPa 296 K Pentane 469.8 K 845.64 R 33.3 atm WVPL Answer: D= 72 m
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