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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 R290 (HMBP)
Capillary tube length (m)
QASH M Capillary tube internal diameter (mm) & Evaporating temperature (°C)
0,70,80,911,21,51,7
kcal/hkg/h-57,2-57,2-57,2-57,2-57,2-57,2-57,2
1301,585,124,39            
1401,704,434,06            
1501,833,883,55            
1601,950,413,12            
1702,073,012,77            
1802,192,702,485,505,04          
1902,312,432,234,954,54          
2002,432,192,014,474,10          
2202,681,801,663,693,40          
2402,921,511,403,122,865,845,35        
2603,161,291,192,662,444,974,56        
2803,411,111,032,282,104,303,95        
3003,65  1,981,833,763,45        
3203,89  1,751,623,303,04        
3404,14  1,551,432,922,695,114,71      
3604,38  1,381,272,602,394,604,22      
3804,62  1,231,142,332,154,133,79      
4004,87  1,101,022,111,953,723,42      
4505,48    1,661,542,932,69      
5006,08    1,331,242,382,19      
5506,69    1,091,011,961,815,234,80    
6007,30      1,631,514,384,03    
6507,91      1,381,283,723,42    
7008,52      1,181,103,212,96    
7509,13        2,802,59    
8009,73        2,462,27    
85010,34        2,172,00    
90010,95        1,921,78    
95011,56        1,711,59    
100012,17        1,541,435,174,76  
105012,78        1,381,294,704,34  
110013,38        1,251,174,303,96  
115013,99        1,141,073,933,63  
120014,60          3,603,33  
125015,21          3,313,06  
130015,82          3,052,83  
135016,43          2,822,61  
140017,03          2,612,425,184,77
145017,64          2,432,254,824,45
150018,25          2,262,104,504,15
155018,86          2,111,964,203,88
160019,47          1,971,843,943,64
165020,08          1,841,723,693,42
170020,68          1,731,623,473,21
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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