Document 4aYGnRr7kkEbQwdGDJw0XJ751

286 CHAPTER 19 1965 Guide And Data Book T',,M"&s t*1 1^**IV-->|| Ui i_C_ui Ul i/lU__^_A__J_IU. UIIU...I.I...V...C...IMIS Boiling Point Table 12.... Electrical Properties of Liquid Refrigerants Refrigerant No. 1 Nome latent Neat at Boc&ng Btv/Mol fronton Constant* Refer- Refrigerant No. Name femper- Dideetrie ' Volume RetittirifyX I0-* Refer- riant Centimeter^ 630 | Methyl Amine 717 Ammonia 764 Sulfur Dioxide 631 Ethyl Amine 611 Methyl Formate ; 744A 21 30 22 40 Nitrous Oxide Dichloromonofluoro- . methane Methylene Chloride Monbchlorodifluoromethane Methyl Chloride 113 Trichlorotrifluoroethane 500 114 Dichlorotetrafluoroethane 11 Triehloromonofluoro- methane 14 Tetrafluoromethane 13B1 12 601 * 13 Monobromotrifiuoromethane Dichlorodifluoromethane Isobutane Butane Monochtorotriliuoro- methane 11,172 10,036 10,697 11,733 12,290 23.28 23.25 22.58 22:50 22.39 7,144 10,720 21.47 21.11 11,781 8,687 20.92 20.76 9,304 20.73 11,828 20.49 8,786 10,085 20.35 20.25 10,765 20.14 5,161 19.75 7,606 19.62 8,591 19.61 9,206 9,613 6,670 19.59 . .19.58 19.33 290 ' Propane 170 Ethane 1150 Ethylene 8,006 6,354 5,791 19:27 19.13 19.01 * Latent heat/Boffin* mint m'R.nHTM. VELOCITY OF SOUND 1 11 1' 1 * II Trichlororoono- 1 fluoromethane ] 84 77 2.28 1.92 6368- 12 Dichlorodifluoro- | 84 mothanA 1 2.13 1.74* 5390 77 >12 13 -22 2.3 12 12 13 ** 12 13 13 1 21 Dichloromono- j fluoromethane 1 82 77- 5.34 4.88 0.894 3 fluoromethane | 86 77 2.44 >12 :* 113 Trichlorotrifluoro-1 methane ] 86 77 2.44 1.68 4549 >12 * 114 Dichlorotctrafluoroethane J 88 1 77 2.17 1.83 6647 ' 11 . ; 30 Methylene Chloride 77 9.1 0.1 ' ' 290 * Propane * 1.27 7384 ; 500 .. .b : 1; 717 Ammonia 1.80 5575 69 15.5 1 744 32 T.59 1 * 744A Nitrous Oxide 32 1.61 764 32 16.6 12 13 12 13 12 13 12 13 13 12 12 2 ; To obtun acton) numeric*] vafan, multiply rabies in thb bImi' by I0. - " Aaeetrope of Befricennts 13 and 152* (73.8/2A2 percent by weichti. Ambient Temperature. , " Data for Befripraut 11 from General Chemical Diviakm, Allied Cbemi- a other refrifem&te from EL L duPont de Memuora A Co., lae. Examples of the velocity of sound in the vapor phase of several fluorinated refrigerants are shown in Table 14. The REFRIGERANT PERFORMANCE velocity increases when the temperature is increased and de Tables of thermodynamic properties for the various refrig creases when the pressure is increased. The velocity of sound * erants and methods of calculating refrigerant performance can be calculated from the following equations: are shown in Chapters 1 and 20. - .......... The theoretical calculated performance of a number of re ;<i>' frigerants for the standard cycle of 5 F evaporation and 86 F condensation is shown in Table 15. Cideulatjuj data for other where conditions are given in Table 16. In both tables the calcula- V. = velocity of sound, feet per second. - tions have been made on the basis of one ton of refrigeration. The tables can be used to compare the properties of different fr " 32.1740 (pound) (feet) per (pound) (second) (second). P - pressure, pounds per square foot, absolute. . p -- density, pounds per cubic foot. y " Cpfc* " ratio of specific heats. 5 = entropy, Btu per (pound) (Rankine degree). , .. T -- temperature, Rankine degrees. refrigerants, but actual operating conditions will lie' some what different from the calculated data. In most cases, it is assumed that the suction vapor is saturated. It is also as sumed that the compression is adiabatic or at constant en tropy. For Refrigerants 113 and 114, these assumptions would lead to some liquid in the discharge vapor. In these cases; it is assumed that the discharge vapor is saturated and The velocity of sound ;can be estimated`from the tables of. the suction .vapor is slightly superheated.' In Section F of thermodynamic properties. The change in pressure;with-re Table.16,-it is assumed that the temperature of the suction spect to a change in density (dP/dp) can be estimated either gas is 65 F. Comparison with'Section E illustrates the effect at constant entropy or at constant temperature. It is simpler of suction gas superheating on the refrigerant properties-. -- to make this estimation at constant temperature but, in thin The comparisons shown in Tables 17 and 18 are'based on case, the heat capacity ratio must also be known as shown constant compressor displacement. They illustrate the effect above. The practical velocity of a gas in'piping or;through of different evaporating and condensing temperatures on openings is limited by the velocity of sound in the gas. ' " ' theoretical capacity and horsepower of compression.., Refrigerants; Table 13.... Electrical Properties of Refrigerant Vapors 287 Refrigerant No. Name fictmt, Atm. fempera- Pitfochic Rehtiee DMeetiie Strength (Nitrogens 1) Trichlorocnonofluoromethane | . . 0.5 11 1.0 79- 1.0019 1.009 73 3.1 Dicblorodifluoromethane - . | . 0.5 , S-. .12. - 1.0 - 73 1.0016 1.012-' 452f 2.4 ,13- - Mopochlprotrifluoromethane j 0.5 1.0 84 1.0013 73 1.4 Tetrafluoromethane 14 ` { 0.5 1.0 76 1:0006 73 1.0 DicUoromonofluoromethane | 0.5 21 .1.0 86 1:0035 1.021 73 1.3 . Monochlorodifluoromethane | 0.5 '22 1.0 78 y 1.0035 1.004 73 4601 1.3 THchlorotrifluoroethane -113 | o\ 73 liOlO 440t 2.6 -114 Dichlorotetrafluoroethane - | 0.5 fO 1.0 ' N - 73 - 1.0021 1.002- 2951 2:8 30; Methylene Chloride j 1.0 1.0 212 73 1.0065 1.11 40 Methyl Chloride 170 - 290 500 Ethane Propane ...* 717 ' Ammonia | 1.0 1.0 ' 1.0 73 73 j. 32 ' 1.00094 ' 1;.0Q15 -* 1.009 ** 1.024 j .1.0 32 . , . 1.0072 . 1.06 4401 4701 0.82 Volume Rexutmfy, Megohm-Centimeters 7435X10' 7277X10* 3658X10* 2113X10* 9418X10* 14,830X10* 10,530X10* 7645X10* 729 744 744A 764 1150 Air ' . ' . '- 1,0 Carbon Dioxide. ' \ 1.0 : i .o Nitrous Oxide Sulfur Dioxide 1.0 1.0 1.0 1.0 . - Ethylene 1.0 1.0 32 32 - 32 73 73 : 73 32 73. 1.00059 1.00099 : 1.00113 1.00075 1'00144 0.88 1.14 1.9 1.21 * Saturation vapor pressure. * Ambient temperature. "Table 14 .... Velocity of.Sound in Refrigerant Vapors* (Feet per Second} Refer ence 14 12 15 14 12 15 14 15 14 15 14 12 15 14 12 15 12 ` 15 14 12 15 2 15 2 15 2 12 12 .2 15 2 2 15 2 15 2 15 2 15 ftefogwant 12 113 .114 Pressore, pda 10 10 ' 1' " 50 ,. 480 . - 10 391. ; Temperature, F 100 469 :! 503 390 . 41! ISO ' 490 525 409 430 * Data tram EL L duPont de Hemouia'ft Co., Iao. Deed by permtalion. * Belov saturation temperature. j Refrigerant. Prenure, PM 12 100 22 100 12 200 22 200 Temperature, F 50 100 150 457 * . 574 490 * - **? .572