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Recommendations for the determination of capillary tube size
Table considers condensing temperature Tc = 45 °C. Non adiabatic flow in capillary..
Increase length 2% per each K of increase of condensing temperature..
TABLE FOR REFRIGERANT R134a (HMBP)
Capillary tube length (m)
QASH M Capillary tube internal diameter (mm) & Evaporating temperature (°C)
0,70,80,911,21,51,72
kcal/hkg/h-57,2-57,2-57,2-57,2-57,2-57,2-57,2-57,2
1002,324,113,86              
1102,563,403,20              
1202,792,882,71              
1303,022,452,31              
1403,252,122,004,304,04            
1503,491,841,743,773,55            
1603,721,621,533,323,12            
1703,951,431,352,932,76            
1804,181,271,212,632,48            
1904,421,141,082,362,234,434,16          
2004,65  2,132,003,993,76          
2205,11  1,751,653,313,12          
2405,58  1,471,402,782,634,884,59        
2606,04  1,241,182,362,234,153,91        
2806,51  1,061,022,041,933,603,40        
3006,97    1,771,683,132,96        
3207,44    1,551,472,752,60        
3407,90    1,361,302,422,29        
3608,37    1,211,152,172,06        
3808,83    1,081,031,941,845,194,89      
4009,30      1,741,664,674,42      
45010,46      1,361,303,693,48      
50011,62      1,091,052,992,83      
55012,78        2,462,33      
60013,95        2,051,95      
65015,11        1,731,655,835,50    
70016,27        1,471,425,004,73    
75017,43        1,281,234,384,15    
80018,60        1,111,083,843,64    
85019,76          3,393,22    
90020,92          3,002,86    
100023,25          2,402,304,804,54  
110025,57          1,981,903,943,74  
120027,89          1,641,583,283,12  
130030,22          1,371,332,792,66  
140032,54          1,161,132,382,29  
150034,87            2,051,985,014,76
160037,19            1,781,724,424,21
170039,52            1,551,513,903,72
180041,84            1,361,333,453,31
190044,17            1,201,183,082,95
200046,49            1,061,052,752,65
225052,30              2,122,06
250058,11              1,661,63
275063,92              1,351,33
300069,74              1,091,10
QASH is the cooling capacity under ASHRAE (HMBP) condition corresponding to the indicated mass flow rate M (liquid subcooled 9K, return gas superheated up to 35 °C)..
The relationship between length and diameter is, approximately: (L / L0) = (D / D0)5,4..
 
 
 
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