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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 R404A (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
1103,124,754,30              
1203,414,003,61              
1303,693,423,10              
1403,972,952,67              
1504,262,572,33              
1604,542,252,054,624,19            
1704,832,001,814,103,72            
1805,111,771,613,663,32            
1905,391,601,453,282,98            
2005,681,441,312,962,69            
2206,241,191,082,442,224,614,18          
2406,81  2,041,873,863,52          
2607,38  1,751,603,302,99          
2807,95  1,501,372,842,58          
3008,52  1,301,192,462,244,373,96        
3209,08  1,141,052,171,973,833,48        
3409,65    1,921,753,393,08        
36010,22    1,711,563,022,74        
38010,79    1,531,402,702,46        
40011,35    1,381,262,432,22        
45012,77      1,931,76        
50014,19      1,551,424,163,78      
55015,61      1,271,173,433,11      
60017,03        2,862,61      
65018,45        2,442,23      
70019,87        2,101,92      
75021,29        1,821,67      
80022,71        1,591,47      
85024,13        1,401,294,724,29    
90025,55        1,241,154,203,82    
100028,38          3,403,11    
110031,22          2,802,57    
120034,06          2,342,154,634,22  
130036,90          1,981,823,933,59  
140039,74          1,691,563,383,09  
150042,58          1,461,352,932,69  
160045,42          1,271,182,562,35  
170048,25          1,111,032,252,07  
180051,09            1,991,844,874,45
190053,93            1,771,644,363,99
200056,77            1,581,473,923,59
225063,87            1,221,143,062,81
250070,96              2,442,25
275078,06              1,991,84
300085,15              1,641,53
325092,25              1,371,29
350099,35              1,161,10
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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