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Consider the following ideal cascade refrigeration system with pressures of 0.9, 0.4, and 0.12 MPa. If the lower cycle transfers 69kW of energy to the upper cycle, determine the mass flowrate of R-134A (in kg/s) in the upper cycle. a.0.3987 b.0.4114 c.0.3600 d.0.4480

Consider the following ideal cascade refrigeration system with pressures of 0.9, 0.4, and 0.12 MPa. If the lower cycle transfers 69kW of energy to the upper cycle, determine the mass flowrate of R-134A (in kg/s) in the upper cycle. a.0.3987 b.0.4114 c.0.3600 d.0.4480

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
Problem 1.1MA
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Consider the following ideal cascade refrigeration system with pressures of 0.9, 0.4, and 0.12 MPa.

If the lower cycle transfers 69kW of energy to the upper cycle, determine the mass flowrate of R-134A (in kg/s) in the upper cycle.


a.0.3987
b.0.4114
c.0.3600
d.0.4480
(7) Expansion valve Expansion valve Qu Condenser Evaporator Heat Condenser Evaporator inn. & (1) 1-Ⓒ Compressor 10 Compressor
Transcribed Image Text:(7) Expansion valve Expansion valve Qu Condenser Evaporator Heat Condenser Evaporator inn. & (1) 1-Ⓒ Compressor 10 Compressor
Saturated refrigerant-134a-Pressure Specific volume, m³/kg Press., Sat. P kPa temp., Tat "C Sat. liquid, V₂ Sat. vapor, V₂ table Internal energy, kJ/kg Sat. liquid, U₁ Evap., Us Enthalpy, kJ/kg Sat. Sat. vapor, liquid, Evap., h h₂ Sat. Sat. vapor, liquid, Mg S₁ Entropy, kJ/kg-K Evap.. Sig Sat. vapor, Sg 60 -36.95 0.0007097 0.31108 3.795 205.34 209.13 3.837 223.96 227.80 0.01633 0.94812 0.96445 70 -33.87 0.0007143 0.26921 7.672 203.23 210.90 7.722 222.02 229.74 0.03264 0.92783 0.96047 80 -31.13 0.0007184 0.23749 11.14 201.33 212.48 11.20 220.27 231.47 0.04707 0.91009 0.95716 90 -28.65 0.0007222 0.21261 14.30 199.60 213.90 14.36 218.67 233.04 0.06003 0.89431 0.95434 100 -26.37 0.0007258 0.19255 17.19 198.01 215.21 17.27 217.19 234.46 0.07182 0.88008 0.95191 120-22.32 0.0007323 0.16216 22.38 195.15 217.53 22.47 214.52 236.99 0.09269 0.85520 0.94789 140 -18.77 0.0007381 0.14020 26.96 192.60 219.56 27.06 212.13 239.19 0.11080 0.83387 0.94467 160 -15.60 0.0007435 0.12355 31.06 190.31 221.37 31.18 209.96 241.14 0.12686 0.81517 0.94202 180 -12.73 0.0007485 0.11049 34.81 188.20 223.01 34.94 207.95 242.90 0.14131 0.79848 0.93979 200 -10.09 0.0007532 0.099951 38.26 186.25 224.51 38.41 206.09 244.50 0.15449 0.78339 0.93788 240 -5.38 0.0007618 0.083983 44.46 182.71 227.17 44.64 202.68 247.32 0.17786 0.75689 0.93475 280 -1.25 0.0007697 0.072434 49.95 179.54 229.49 50.16 199.61 249.77 0.19822 0.73406 0.93228 320 2.46 0.0007771 0.063681 54.90 176.65 231.55 55.14 196.78 251.93 0.21631 0.71395 0.93026 360 5.82 0.0007840 0.056809 59.42 173.99 233.41 59.70 194.15 253.86 0.23265 0.69591 0.92856 400 8.91 0.0007905 0.051266 63.61 171.49 235.10 63.92 191.68 255.61 0.24757 0.67954 0.92711 450 12.46 0.0007983 0.045677 68.44 168.58 237.03 68.80 188.78 257.58 0.26462 0.66093 0.92555 500 15.71 0.0008058 0.041168 72.92 165.86 238.77 73.32 186.04 259.36 0.28021 0.64399 0.92420 550 18.73 0.0008129 0.037452 77.09 163.29 240.38 77.54 183.44 260.98 0.29460 0.62842 0.92302 600 21.55 0.0008198 0.034335 81.01 160.84 241.86 81.50 180.95 262.46 0.30799 0.61398 0.92196 650 24.20 0.0008265 0.031680 84.72 158.51 243.23 85.26 178.56 263.82 0.32052 0.60048 0.92100 700 26.69 0.0008331 0.029392 88.24 156.27 244.51 88.82 176.26 265.08 0.33232 0.58780 0.92012 750 29.06 0.0008395 0.027398 91.59 154.11 245.70 92.22 174.03 266.25 0.34348 0.57582 0.91930 31.31 457 0.025645 94.80 52.02 246.82 95.48 171.86 267.34 354 0.56445 0.91853 850 33.45 0.0008519 0.024091 97.88 150.00 247.88 98.61 169.75 268.36 0.36417 0.55362 0.91779 900 35.51 0.0008580 0.022703 100.84 148.03 248.88 101.62 167.69 269.31 0.37383 0.54326 0.91709 950 37.48 0.0008640 0.021456 103.70 146.11 249.82 104.52 165.68 270.20 0.38307 0.53333 0.91641 1000 39.37 0.0008700 0.020329 106.47 144.24 250.71 107.34 163.70 271.04 0.39196 0.52378 0.91574 800
Transcribed Image Text:Saturated refrigerant-134a-Pressure Specific volume, m³/kg Press., Sat. P kPa temp., Tat "C Sat. liquid, V₂ Sat. vapor, V₂ table Internal energy, kJ/kg Sat. liquid, U₁ Evap., Us Enthalpy, kJ/kg Sat. Sat. vapor, liquid, Evap., h h₂ Sat. Sat. vapor, liquid, Mg S₁ Entropy, kJ/kg-K Evap.. Sig Sat. vapor, Sg 60 -36.95 0.0007097 0.31108 3.795 205.34 209.13 3.837 223.96 227.80 0.01633 0.94812 0.96445 70 -33.87 0.0007143 0.26921 7.672 203.23 210.90 7.722 222.02 229.74 0.03264 0.92783 0.96047 80 -31.13 0.0007184 0.23749 11.14 201.33 212.48 11.20 220.27 231.47 0.04707 0.91009 0.95716 90 -28.65 0.0007222 0.21261 14.30 199.60 213.90 14.36 218.67 233.04 0.06003 0.89431 0.95434 100 -26.37 0.0007258 0.19255 17.19 198.01 215.21 17.27 217.19 234.46 0.07182 0.88008 0.95191 120-22.32 0.0007323 0.16216 22.38 195.15 217.53 22.47 214.52 236.99 0.09269 0.85520 0.94789 140 -18.77 0.0007381 0.14020 26.96 192.60 219.56 27.06 212.13 239.19 0.11080 0.83387 0.94467 160 -15.60 0.0007435 0.12355 31.06 190.31 221.37 31.18 209.96 241.14 0.12686 0.81517 0.94202 180 -12.73 0.0007485 0.11049 34.81 188.20 223.01 34.94 207.95 242.90 0.14131 0.79848 0.93979 200 -10.09 0.0007532 0.099951 38.26 186.25 224.51 38.41 206.09 244.50 0.15449 0.78339 0.93788 240 -5.38 0.0007618 0.083983 44.46 182.71 227.17 44.64 202.68 247.32 0.17786 0.75689 0.93475 280 -1.25 0.0007697 0.072434 49.95 179.54 229.49 50.16 199.61 249.77 0.19822 0.73406 0.93228 320 2.46 0.0007771 0.063681 54.90 176.65 231.55 55.14 196.78 251.93 0.21631 0.71395 0.93026 360 5.82 0.0007840 0.056809 59.42 173.99 233.41 59.70 194.15 253.86 0.23265 0.69591 0.92856 400 8.91 0.0007905 0.051266 63.61 171.49 235.10 63.92 191.68 255.61 0.24757 0.67954 0.92711 450 12.46 0.0007983 0.045677 68.44 168.58 237.03 68.80 188.78 257.58 0.26462 0.66093 0.92555 500 15.71 0.0008058 0.041168 72.92 165.86 238.77 73.32 186.04 259.36 0.28021 0.64399 0.92420 550 18.73 0.0008129 0.037452 77.09 163.29 240.38 77.54 183.44 260.98 0.29460 0.62842 0.92302 600 21.55 0.0008198 0.034335 81.01 160.84 241.86 81.50 180.95 262.46 0.30799 0.61398 0.92196 650 24.20 0.0008265 0.031680 84.72 158.51 243.23 85.26 178.56 263.82 0.32052 0.60048 0.92100 700 26.69 0.0008331 0.029392 88.24 156.27 244.51 88.82 176.26 265.08 0.33232 0.58780 0.92012 750 29.06 0.0008395 0.027398 91.59 154.11 245.70 92.22 174.03 266.25 0.34348 0.57582 0.91930 31.31 457 0.025645 94.80 52.02 246.82 95.48 171.86 267.34 354 0.56445 0.91853 850 33.45 0.0008519 0.024091 97.88 150.00 247.88 98.61 169.75 268.36 0.36417 0.55362 0.91779 900 35.51 0.0008580 0.022703 100.84 148.03 248.88 101.62 167.69 269.31 0.37383 0.54326 0.91709 950 37.48 0.0008640 0.021456 103.70 146.11 249.82 104.52 165.68 270.20 0.38307 0.53333 0.91641 1000 39.37 0.0008700 0.020329 106.47 144.24 250.71 107.34 163.70 271.04 0.39196 0.52378 0.91574 800
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