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Question: therefore ie nyuired power input is 1 liquid example 12...

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Therefore ie, nyuired power input is 1 liquid *Example 1.2 A vapour compression refrigerator operates with Ammonia which enters just saturated vapour at-22C and is compressed to give 100 K of subcooling of the liquid following condensation. Calculate: (a) The (b) The Refrigeration Effect (c) The COP the compressor as neat. There is no up rheat. and temperature at commencement of throttling. pressure d) The COP of the same machine operating as a heat pump Condenor 2-4 Jckonge in presr 2-니 Chyrl) entto Dr Rena Cole, Spring 2019 14
ME4516 Therwodynamies 2 413.3 Section 1 Heat Pump & Refrigenation Cycles We want values for enthalpy and entropy of Ammonia at -22°C, but looking at tables for Ammonia, the values available are for -20 °C and -25 °c Ammonia, NH, (p pressure (MPal,e specific volume (m2kg- for other definitions sce p 48) Superheated Saturated 00715 00014S 152 ero 59631499 6387 1606 6736 6292 1616 6639 6203 1626 -30 01196 000148 0963 015160001490772 672 i413 0279 у 0190 000130 0624 0236 0001 520509 i123 i426 0451 О-291 0-183 5785 151 1636 6461 1535 1S43 6379 301 1646 5 549 5963 5 891 5822 000153 0418 433 000155 0347 1582 1439 0630 5407 1560 S-477 0715 3401568 0799 5-276 1576 1675 0429 000157 0289 1812 0516 000158 0243 2045 1450 0613 000160 0-206 2277 1454 08 214 1583 3634 1702 5967 6090 10 15 0728 000162 0175 2514 1459 0963 5154 1590 5576 1711 5509 20 25 100 000166 0128 2989 14661124 5039 1604 $468 1728 5800 30 0-857 000164 0149 275-2 1463 1044 5095 1597 55211719 5853 1-167 000168 011 3231 146 1204 4984 1610 5417 1-350 000170 0096 34751471 1736 5750 1-282 4930 16163368 1744 702 40 1-554 000173 0083 3715 1473 1360 477 622 321 12 5655 610 45 50 2033 000178 0063 4219 1475 1-515 4773 1633 -230 1767 567 1-782 000175 0073 3968 1474 4374825 1628 5275 1760 Freezing point at l atm -.-17.7 C Critical point: Celsius emp ·1324 C pressure 1130MPa(1130bar) P66, Howatson et al. (620.00212), However better tables to use are Rogers and Mayhew, Thermodynamic and Transport Properties of Fluids ISBN 978-06311-9703-4 We need to Interpolate between them. hh1413 kJ/kg
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