Question

Waeer 2C 12 MMP 25 c Problem I: 12 MP An air conditioner with R-134a as the working fluid maintains a house at a constant temperature of 23°C during the summer. The minimum temperature in the air conditioner cycle is -8°C, and the maximum temperature in the air conditioner cycle is equivalent to the outside temperature. The house gains heat from the walls and windows at 110,000 kJ/h when the outside temperature is 35°C, and the people, lights, and appliances in the house generate 4,000 kJ/h Compressor t @ What is the minimum power (in kW) required to drive this air conditioner on a 35°C day? (10 pts) A. นี่เ The condenser of the air conditioner cycle is basically a heat exchanger, in which the R-134a is condensed by rejecting waste heat to cooling water. The cooling water enters the condenser at 12°C at a rate of 0.40 kg/s and leaves at 25°C. R-134a enters the condenser at 1.2 MPa and 50°C and leaves as a saturated liquid at the same pressure. Find the mass flow rate of the R-134a. (10 pts) B.

Please show all equations needed in answer and please specify which thermodynamics table is used for what values taken from any tables

Answer 1

3 Higher Temp. 6.16 3 308-2695 5K43 3x365 5.13& kw - T5, Cop УЗ n8

R-1344 in ka S าวพ่า t4.KPa spee enpt r-emainz canttut- T -18.37 O) d ensaHen. Con

Saturated refrigerant-134a-Pressure table Specific volume, m3/kg Internal energy kJ/kg Enthalpy kJ/k Entropy kJ/kg.K Sat. Sat. Sat. Sat Sat Sat Sat Sat. Sat Press., temp., liquid, vapor, PkPa TsatC v liquid, Evap, vapor, liquid, Evap., vapor, liquid, Evap., vapor, duiou Ul 3.798 205.32 209.12 3.841 223.95 227.79 0.01634 0.94807 0.96441 7.680 203.20 210.88 7.730 222.00 229.73 0.03267 0.92775 0.96042 80 -31.13 0.0007185 0.23753 11.15 201.30 212.46 11.21 220.25 231.46 0.04711 0.90999 0.95710 90-28.65 0.0007223 0.21263 14.31 199.57 213.88 14.37 218.65 233.02 0.06008 0.89419 0.95427 100-26.37 0.0007259 0.19254 17.21 197.98 215.19 17.28 217.16 234.44 0.07188 0.87995 0.95183 60-36.95 0.0007098 0.31121 70-33.87 0.0007144 0.26929 503 47 40 49 140 -18.77 || 0.0007383 || 0. 14014 | | 26.98 | 192.5 219.54 | | 27.08 || 212.08 239.16 | | 0. 11087 || 0.83368 0.94456 160 180-12.73 0.0007487 0.11041 34.83 188.16 222.99 34.97 207.90 242.86 0.14139 0.79826 0.93965 200-10.09 0.0007533 0.099867 38.28 186.21 224.48 38.43 206.03 244.46 0.15457 0.78316 0.93773 240-5.38 0.0007620 0.083897 44.48 182.67 227.14 44.66 202.62 247.28 0.17794 0.75664 0.93458 280 320 2.46 0.0007772 0.063604 54.92 176.61 231.52 55.16 196.71 251.88 0.21637 0.71369 0.93006 360 5.82 0.0007841 0.056738 59.44 173.94 233.38 59.72 194.08 253.81 0.23270 0.69566 0.92836 400 8.91 0.0007907 0.051201 63.62 171.45 235.07 63.94 191.62 255.55 0.24761 0.67929 0.92691 450 12.46 0.0007985 0.045619 68.45 168.54 237.00 68.81 188.71 257.53 0.26465 0.66069 0.92535 -1.25 0.0007699 0.072352 49.97 179.50 229.46 50.18 199.54 249.72 0.19829 0.73381 0.93210

360 5.82 0.0007841 0.056738 59.44 173.94 233.38 59.72 194.08 253.81 0.23270 0.69566 0.92836 8.91 0.0007907 0.051201 63.62 171.45 235.07 63.94 191.62 255.55 0.24761 0.67929 0.92691 450 12.46 0.0007985 0.045619 68.45 168.54 237.00 68.81 188.71 257.53 0.26465 0.66069 0.92535 500 15.71 0.0008059 0.041118 72.93 165.82 238.75 73.33 185.98 259.30 0.28023 0.64377 0.92400 550 18.73 0.0008130 0.037408 77.10 163.25 240.35 77.54 183.38 260.92 0.29461 0.62821 0.92282 600 21.55 0.0008199 0.034295 81.02 160.81 241.83 81.51 180.90 262.40 0.30799 0.61378 0.92177 650 24.20 0.0008266 0.031646 84.72 158.48 243.20 85.26 178.51 263.77 0.32051 0.60030 0.92081 700 26.69 0.0008331 0.029361 88.24 156.24 244.48 88.82 176.21 265.03 0.33230 0.58763 0.91994 750 29.06 0.0008395 0.027371 91.59 154.08 245.67 92.22 173.98 266.20 0.34345 0.57567 0.91912 800 31.31 0.0008458 0.025621 94.79 152.00 246.79 95.47 171.82 267.29 0.35404 0.56431 0.91835 850 33.45 0.0008520 0.024069 97.87 149.98 247.85 98.60 169.71 268.31 0.36413 0.55349 0.91762 900 35.51 0.0008580 0.022683 100.83 148.01 248.85 101.61 167.66 269.26 0.37377 0.54315 0.91692 950 37.48 0.0008641 0.021438 103.69 146.10 249.79 104.51 165.64 270.15 0.38301 0.53323 0.91624 1000 39.37 0.0008700 0.020313 106.45 144.23 250.68 107.32 163.67 270.99 0.39189 0.52368 0.91558 1200 46.29 0.0008934 0.016715 116.70 137.11 253.81 117.77 156.10 273.87 0.42441 0.48863 0.91303 1400 52.40 0.0009166 0.014107 125.94 130.43 256.37 127.22 148.90 276.12 0.45315 0.45734 0.91050 1600 57.88 0.0009400 0.012123 134.43 124.04 258.47 135.93 141.93 277.86 0.47911 0.42873 0.90784 1800 62.87 0.0009639 0.010559 142.33 117.83 260.17 144.07 135.11 279.17 0.50294 0.40204 0.90498 2000 67.45 0.0009886 0.009288 149.78 111.73 261.51 151.76 128.33 280.09 0.52509 0.37675 0.90184 2500 77.54 0.0010566 0.006936 166.99 96.47 263.45 169.63 111.16 280.79 0.57531 0.31695 0.89226 3000 86.16 0.0011406 0.005275 183.04 80.22 263.26 186.46 92.63 279.09 0.62118 0.25776 0.87894 Acti

Sat. 0.025621 246./9 267.29 0.9183 022683 248.85 269.26 0.9169 0.020313 250.68 270.99 0.9156 40 0.027035 254.82 276.45 0.9480 0.023375 253.13 274.17 0.9327 0.020406 251.30 271.71 0.9179 50 0.028547 263.86 286.69 0.9802 0.024809 262.44 284.77 0.9660 0.021796 260.94 282.74 0.9525 60 0.029973 272.83 296.81 1.0110 0.026146 271.60 295.13 0.9976 0.023068 270.32 293.38 0.9850 70 0.031340 281.81 306.88 1.0408 0.027413 280.72 305.39 1.0280 0.024261 279.59 303.85 1.0160 80 0.032659 290.84 316.97 1.0698 0.028630 289.86 315.63 1.0574 0.025398 288.86 314.25 1.0458 90 0.033941 299.95 327.10 1.0981 0.029806 299.06 325.89 0860 0.026492 298.15 324.64 1.0748 100 0.035193 309.15 337.30 1.1258 0.030951 308.34 336.19 1.1140 0.027552 307.51 335.06 1.1031 110 0.036420 318.45 34759 1.530 0.032068 317.70 346.56 1.1414 0.028584 316.94 345.53 1.1308 120 0.037625 327.87 357.97 1.17980.033164 327.18 357.02 1.1684 0.029592 326.47356.06 1.1580 130 0.038813 337.40 368.45 1.2061 0.034241 336.76 367.58 1.19490.030581 336.11 366.69 1.1846 140 0.039985 347.06 379.05 1.2321 0.035302 346.46 378.23 1.2210 0.031554 345.85 377.40 1.2109 150 0.041 143 356.85 389.76 1.2577 | 0.036349 356.28 389.00 12467 |ー 0.032512 35571 388 22 1 2868 160 0.042290 366.76 400.59 1.28300.037384 366.23 399.88 1.2721 0.033457 365.70 399.15 1.2623 170 0.043427 376.81 411.55 1.3080 0.038408 376.31 410.88 1.2972 0.034392 375.81 410.20 1.2875 180 0.044554 386.99 422.64 1.3327 0.039423 386.52 422.00 1.322 0.035317 386.04 421.36 1.3124 P = 1.20 MPa (7,,-46.29°C) P = 1.40 MPa (T,-= 52.40°C) P= 1.60 MPa (T, --57.88°C) Sat. 0.016715 253.81 273.87 0.9130 0.014107 256.37 276.12 0.9105 0.012123 258.47 277.86 0.9078 0.017201 257.63 278.27 0.9267 60 0.018404 267.56 289.64 0.9614 0.015005 264.46 285.47 0.93890.012372 260.89 280.69 0.9163 70 0.019502 277.21 300.61 0.9938 0.016060 274.62 297.10 0.9733 0.013430 271.76 293.25 0.9535 80 0.020529 286.75 311.39 1.0248 0.017023 284.51 308.34 .0056 0.014362 282.09 305.07 0.9875 90 0.021506 296.26 322.07 1.0546 0.017923 294.28 319.37 1.0364 0.015215 292.17 316.52 1.0194 100 0.022442 305.80 332.73 1.0836 0.018778 304.01 330.30 1.0661 0.016014 302.14 327.76 1.0500 110 0.023348 315.38 343.40 1.1118 0.019597 313.76 341.19 1.0949 0.016773 312.07 338.9 1.0795 Activat