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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 R290 (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
1501,761,551,623,593,76          
1551,821,451,513,363,52          
1651,941,281,332,963,10          
1752,051,141,182,632,75          
1852,171,021,062,352,46          
2002,35  2,012,10          
2102,47  1,821,913,773,94        
2202,58  1,651,733,433,58        
2352,76  1,451,523,003,13        
2502,93  1,281,342,642,76        
2653,11  1,141,192,342,45        
2803,29  1,021,072,102,19        
2953,46    1,881,973,603,76      
3153,70    1,651,723,143,29      
3353,93    1,451,522,762,90      
3554,17    1,291,352,452,58      
3754,40    1,151,212,192,30      
3954,64    1,041,091,972,073,563,70    
4204,93      1,731,823,133,26    
4455,22      1,541,622,782,89    
4705,52      1,371,452,482,58    
5005,87      1,211,282,182,27    
5306,22      1,071,131,932,01    
5606,57        1,721,80    
5956,98        1,521,58    
6307,40        1,351,413,663,82  
6707,87        1,191,243,213,36  
7058,28        1,071,112,883,02  
7508,80          2,532,65  
7959,33          2,242,34  
8409,86          1,992,08  
89010,45          1,761,84  
94511,09          1,551,63  
100011,74          1,381,44  
106012,44          1,221,28  
112013,15          1,091,143,773,89
119013,97            3,343,45
126014,79            2,983,08
133515,67            2,652,74
141516,61            2,362,44
150017,61            2,102,17
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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