Document 3QaKg8qKxDO2qgjdOBrwkdK4E

HEATINC VENTILATING AIR CONDITIONING GUIDE 1944 Table 9. Pressure Losses in Dichlorodifluoromethane Suction Refrigerant Lines Copper Pipe Actual OJD. Inches Capacity Btu per Hour 2,000 4,000 6,000 8,000 10,000 54 12.000 14,000 16,000 ' 18,000 20,000 7,000 10,000 15,000 20.000 IX 25,000 35,000 45,000 60,000 70,000 10,000 15,000 20.000 30,000 IX 40,000 * 50,000 60.000 80,000 100.000 30,000 40,000 60,000 60,000 70,000 IX 80,000 90,000 .100,000 120,000 140,000 . 50,000 ' 100,000 150,000 200,000 2X ; 250,000 300,000 350,000 400,000 Pressure Drop in Pounds per Square Inch per 100 Fra -10 0.3 1.3 2.8 4.8 7.4 10.5 14.0 0.4 1.0 1.9 3.3 5.0 9.7 15.8 0.3 .0.7 1.2 2.6 4.6, 7.0 10.0 1.6 2.7 4.2 6.1 8.7 0.7 2.6 5.6 9.8 14.8 Refrigerant Temperature Deg F i 0 10 20 30 40 50 0.3 0.2 0.2 0.2 0.1 0.1 1.0 0.8 0.7 0.6 0.5 0.4 2.2 1.8 1.5 1.2 1.0 0.9 3.8 3.1 2.6 2.1 1.8 1.5 5.8 4.8 3.9 3.3 2.8 2.3 8.4 11.0 14.5 6.8 9.1 12.0 15.0 5.6 7.6 9.8 12.3 15.0. 4.7 6.4 8.3 10.4 12.7 4.0 .5.4 7.0 8.7 10.7 3.3 4.5 5.8 7.2 8.9 0.3 0.3 0.2 0.2 0.2 0.1 0.7 0.5 0.5 0.4 0.3 0.3 1.5 1.2 1.0 0.8 0.7 0.6 2.6 2.1 1.7 1.4 1.2 1.0 4.0 3.2 2.7 2.2 1.9 1.6 7.7 6.2 5.1 4.3 3.6 3.0 12.6 10.0 8.4 7.0 5.9 - 4.9 14.8 12.2 10.2 8.6 .14.0 11.7 0.2 0.2 0.2 0.1 0.1 0.1 0.5 0.4 0.3 0.3 0.2 0.2 0.9 0.7 0.B 0.5 0.4 0.4 2.1 1.6 1.3 1.1 0.9 0.8 3.6 2.8 2.3 1.9 1.6 1.4 5.5 7.8 14.0 4.4 6.2 11.0 3.5 5.0 8.7 13.5 2.0 4.2 7.3 11.3 2.5 2.1 3.5. 3.0 6.2 5.2 9.5 * 8.2 1.3 1.0 0.8 0.7 0.6 . 0.5 2.1 1.7 1.4 1.1 0.9 0.8 3.2 2.5 2.1 1.7 1.4 1.2 4.5 3.6 2.9 2.4 2.0 1.7 6.3 4.8 3.8 3.1 2.6 2.2 8.4 6.3 4.9 4.0-- 3.3 2.8 8.0 6.2 4.9 471 3.5 10.0 7.6 6.1 5.0 4.2 8.6 7.0 5.9 9.5 .7.9 0.5 0.4 0.3 0.3 0.2 0.2 1.8 1.4 1.1 0.9 0.8 0.7 3.9 3.0 2.4 2.0 1.6 1.4 6.7 5.2 4.1 3.4 2.8 2.4 10.3 14.5 19.5 8.0 11.3 15.3 19.6 6.3 9.0 12.0 15.3 5.1 7.2 9.7 12.5 4.2 6.0 7.8 10.0 3.6 -5.0 6.7 8.5 aLengthof tubing includes the average number of fittings. with the cooling coils. Another common and efficient method of cooling spray water is to use a Baudelot type of heat absorber where the water flows over direct expansion coils at a rate sufficiently high to give efficient heat transfer from water to refrigerant. Another type of spray water cooler is the shell and tube heat exchanger in which the refrigerant is expanded into a shell enclosing the tubes through which the water flows. The velocity of the water in the tubes affects the rate of heat transfer, and as the refrigerant is in the shell com- 484 CHAPTER 25. REFRICElfATION Table'9. Pressure Losses in Dichlorodifluoromethane Suction Refrigerant Lines (Concluded) Copper Pipe Actual O.D. Inches Capacity Btu per Hour 50,000 100,000 150,000 200,000 250,000 2H 300,000 350.000 400,000 450,000 500,000 550.000 600,000 Pressure Drop in Pounds per Square Inch per 100 Fra Refrigerant Temperature Deg F -10 0 10 20 30 40 50 0.2 0.2 0.1 0.1 0.1 0.1 0.1 0.7 0.6 0.5 0.4 0.3 0.2 0.2 1.6 1.2 1.0 0.8 0.6 0.5 0.4 2.8 2.1 1.7 1.4 1.1 0.9 0.7 4.3 3.4 2.6 2.1 1:7 1.3 1.1 6.1 4.5 3.7 3.0 2.4 1.9 1.5 8.2 6.0 5.0 4.0 3.2 2.5 2.0 517.8 6.5 4.2 3.3 2.7 7.7 ' 6.4 5.3 4.0 3.5 7.8 6.4 5.0 4.2 7.7 6.2 5.1 7.4 6.2 200.000 1.2 1.0 0.8 . 0.6 0.5 0.4 0.4 300,000 2.6 2.0 1.6 1.3 1.0 0.8 0.7 400,000 4.5 3.4 2.6 2.1 1.7 1.4 1.3 500.000 7.3 5.4 4.1 3.3 2.7 2.2 1.9 3X 600,000 8.1 6.0 4.7 3.8 3.1 2.7 700,000 800.000 900.000 1,000,000 8.4 6.5 5.2 4.2 3.5 8.6 6.8 5.5 . 4.6 8.7 7.0 5.9 8.9 7.3 300.000 400,000 500,000 600,000 1.2 0.9 0.7 0.6 0.5, 0.4 0.3 2.0 1.6 1.3 1.0 0.8 0.7 0.6 3.2 2.5 1.9 1.6 1.3 1.0 0.9 4.6 3.6 2.8 2.2 1.8 1.5 1.3 700,000 6.4 4.9 3.8 3.0 2.5 2.0 1.7 3H 800,000 8.7 6.4 4.9 3.9 3.2 2.5 2.2 900,000 8.2 6.2 4.9 3.9 3.2 2.7 1,000,000 7.7 6.1 4.9 4.0 3.3 1,100,000 1.200,000 1,300,000 1,400,000 9.4 7.3 5.8 4.8 4.0 8.7 6.9 5.6 4.8 8.0 6.6 5.6 9.3 7.6 6.4 400,000 1.0 0.8 0.6 0.4 0.4 0.3 0.3 . 600,000 2.4 1.8 1.4 1.1 0.9 0.7 0.6 800,000 4.1 3.1 2.4 2.0 1.6 1.3 1.1 1,000,000 6.6 4.8 3.7 3.0 2.5 2.0 1.6 1,200,000 10.0 7.1 5.4 4.4 3.5 2.9 2.4 1,400,000 1,600,000 1,800,000 2,000.000 2,200,000 10.0 . 7.5 5.9 4.8 3.9 3.3 10.0 7.7 ' 6.2 5.1 4.2 10.0 7.9 6.4 5.3 9.7 7.9 6.6 9.5 7.9 aLength of tubing includes the average number of fittings. pletely surrounding the tubes at all times, good contact and a high rate of heat transfer are insured. The disadvantage of such a system is that with the falling off of load on the compressor the suction temperature or the temperature in the evaporator drops and there is a possibility of freezing the water in the tubes, which, of course, might split the tubes and allow the refrigerant to escape into the water passage. This danger can be eliminated by automatic safety devices. . Another system of cooling spray water is to submerge coils in the spray 485