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Recommendations for the determination of capillary tube size
Table considers condensing temperature Tc = 45 °C and heat exchanger in capillary..
Increase length 2% per each K of increase of condensing temperature..
TABLE FOR REFRIGERANT R404A (LBP)
Capillary tube length (m)
QASH M Capillary tube internal diameter (mm) & Evaporating temperature (°C)
0,60,70,80,911,21,5
kcal/hkg/h-30-23,3-30-23,3-30-23,3-30-23,3-30-23,3-30-23,3-30-23,3
1303,511,391,473,223,38          
1353,641,291,362,993,13          
1403,781,201,262,772,91          
1453,911,111,182,582,71          
1504,051,041,102,412,52          
1554,18 1,032,252,36          
1604,32  2,112,21          
1654,45  1,982,08          
1704,59  1,871,96          
1754,72  1,761,843,683,81        
1804,86  1,661,743,483,60        
1905,13  1,491,563,113,22        
2005,40  1,341,402,802,90        
2256,07  1,051,102,202,28        
2506,74    1,771,833,353,49      
2757,42    1,461,512,752,87      
3008,09    1,221,262,302,40      
3258,77    1,041,071,942,033,553,69    
3509,44      1,671,743,043,17    
37510,12      1,451,512,642,74    
40010,79      1,271,322,302,40    
42511,46      1,121,172,032,11    
45012,14       1,041,801,88    
47512,81        1,611,68    
50013,49        1,451,51    
52514,16        1,311,363,543,78  
55014,84        1,191,243,213,43  
57515,51        1,081,132,923,12  
60016,19         1,032,672,85  
65017,53          2,252,41  
70018,88          1,932,06  
75020,23          1,671,79  
80021,58          1,451,56  
85022,93          1,281,37  
90024,28          1,131,22  
95025,63          1,011,093,543,76
100026,98            3,183,38
110029,67            2,612,77
120032,37            2,182,32
130035,07            1,841,96
140037,77            1,581,68
150040,46            1,371,46
QASH is the cooling capacity under ASHRAE (LBP) condition corresponding to the indicated mass flow rate M (liquid subcooled down to 32 °C, return gas superheated up to 32 °C)..
The relationship between length and diameter is, approximately: (L / L0) = (D / D0)5,4..
 
 
 
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