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How to produce CROSS FIN TUBE heat exchanger
The copper tube material of CROSS FIN TUBE heat exchanger manufactured by Joongwon Refrigeration & Heating has more than99.9% purity of phosphoric and deoxidation, and the standard of KSD-5031, C-1220T, a diameter of 9.52mm, 12.7mm, 15.88mm, and a thickness of 0.28~1.0mm to be used for applications. For the material of the Fin, we mold AL SHEET and COPPER SHEET in corrugated or SLIT type, laminate it, and insert cupper tube.As it is completely and uniformly expanded by the mechanical expansion device, the copper tube and Fin are fully contacted with each other, allowing the high heat transfer coefficient and high durability.
Pressure-proof test pressure and airtightness test pressure of CROSS FIN TUBE Heat Exchanger
D.X COIL, EVA/COIL HOT/COLD WATER COIL,
STEAM COIL		 CONDENSER COIL
Pressure-proof test : 20Kg/㎠
Airtightness test : 15kg/㎠		 Pressure-proof test : 20Kg/㎠
Airtightness test : 15kg/㎠		 Pressure-proof test : 33Kg/㎠
Airtightness test : 25kg/㎠
Total heat transfer area of the coil
A (㎡) = Number of row x number of step x effective length x Selected value as follows (TA)
Standard FIN specification
TRANSFER AREA (㎡ / m)
PIPE PITCH TUBE ＼ FP 2.1 2.5 3 3.2 4.2 4.5 5.5 6 6.5 8 8.5 10 12 15
22 x 25.4 3/8” 0.5337 0.4526 0.3831 0.361 0.2821 0.2684 0.2249 0.208 0.1951 0.1639 0.1568 0.138 0.1213 0.1034
27.5 x 31.75 3/8” 0.8414 0.7188 0.5984 0.5629 0.4375 0.4104 0.3415 0.3156 0.2938 0.2541 0.2326 0.2033 0.1746 0.146
27.5 x 31.75 1/2" 0.7896 0.669 0.5657 0.5328 0.4167 0.3945 0.3298 0.3045 0.2857 0.2396 0.2289 0.2009 0.1759 0.1494
33 x 38.1 1/2" 1.1453 0.9689 0.8146 0.7663 0.5964 0.5607 0.4665 0.4312 0.4013 0.3341 0.3169 0.2763 0.2378 0.1991
33 x 38.1 5/8” 1.0924 0.9244 0.7804 0.7346 0.5733 0.5412 0.4512 0.4175 0.3897 0.326 0.3107 0.2717 0.2368 0.1997
43.3 x 50 5/8” 1.9825 1.6708 1.4036 1.3186 1.0186 0.9589 0.792 0.7296 0.6781 0.5601 0.5251 0.4591 0.3945 0.3258
Outside view of COIL
Outside measurement of coil
EL(mm) L(mm) H(mm)
500 ~ 2000 EL + 100 EH + 80
2001 ~ 4000 EL + 100 EH + 100
ROW 1 2 3 4 6 8 10 12
W(mm) 80 110 140 180 240 310 370 440
Diameter of connecting pipe
Flow rate
(Flow rate)( L/min)		 Diameter
(Diameter)(mm)
0 ~ 150 40A
151 ~ 250 50A
251 ~ 400 65A
401 ~ 600 80A
601 ~ 950 100A
Outside view of COIL
COIL size and Air Passing Area
NUMBER
OF STEPS		 10 12 14 16 18 20 22 24 26 28 30 32 34
EFFECTIVE
LENGTH		 381 457 33 610 689 762 838 914 990 1067 1143 1219 1295
500 0.192 0.23 0.268 0.306 0.344 0.382 0.418 0.456 0.496 0.534 0.57 0.61 0.648
600 0.231 0.278 0.322 0.367 0.413 0.459 0.502 0.547 0.595 0.641 0.664 0.732 0.778
700 0.269 0.322 0.375 0.429 0.482 0.535 0.585 0.639 0.695 0.748 0.798 0.854 0.907
800 0.307 0.368 0.428 0.49 0.551 0.611 0.669 0.73 0.794 0.855 0.922 0.976 1.037
900 0.346 0.414 0.483 0.551 0.619 0.688 0.753 0.821 0.893 0.961 1.026 1.098 1.167
1000 0.381 0.57 0.533 0.61 0.689 0.762 0.838 0.914 0.99 1.067 1.143 1.219 1.295
1100 0.423 0.506 0.59 0.672 0.757 0.841 0.92 1.003 1.091 1.175 1.254 1.342 1.426
1200 0.461 0.552 0.643 0.735 0.826 0.917 1.003 1.095 1.191 1.282 1.366 1.464 1.555
1300 0.499 0.598 0.697 0.796 0.895 0.993 1.087 1.186 1.29 1.389 1.482 1.586 1.685
1400 0.538 0.644 0.751 0.857 0.963 1.07 1.171 1.277 1.389 1.495 1.596 1.708 1.815
1500 0.576 0.69 0.804 0.918 1.302 1.146 1.254 1.368 1.489 1.602 1.71 1.83 1.944
1600 0.615 0.736 0.858 0.979 1.101 1.223 1.338 1.459 1.687 1.709 1.824 1.957 2.074
1700 0.653 0.782 0.911 1.041 1.17 1.299 1.421 1.551 1.687 1.816 1.938 2.074 2.203
1800 0.691 0.828 0.965 1.102 1.238 1.375 1.505 1.642 1.786 2.023 2.052 2.196 2.333
1900 0.73 0.874 1.019 1.163 1.307 1.452 1.589 1.733 1.885 2.029 2.166 2.318 2.463
2000 0.807 0.92 1.072 1.224 1.376 1.528 1.672 1.824 1.984 2.136 2.28 2.44 2.592
2100 0.845 0.966 1.126 1.265 1.445 1.605 1.756 1.915 2.083 2.243 2.394 2.582 2.723
2200 0.883 1.012 1.18 1.348 1.513 1.681 1.84 2.007 2.183 2.35 2.503 2.684 2.851
2300 0.923 1.058 1.233 1.408 1.582 1.757 1.923 2.098 2.282 2.451 2.622 2.906 2.981
2400 0.96 1.104 1.287 1.496 1.651 1.834 2.007 2.189 2.361 2.563 2.736 2.928 3.111
2500 0.999 1.15 1.34 1.53 1.72 1.91 2.09 2.28 2.48 2.67 2.85 3.05 3.24
2600 1.037 1.196 1.394 1.591 1.788 1.987 2.174 2.371 2.579 2.777 2.94 3.172 3.37
2700 1.047 1.242 1.447 1.653 1.857 2.063 2.257 2.463 2.679 2.884 3.078 3.294 3.499
2800 1.057 1.268 1.501 1.714 1.926 2.139 2.341 2.554 2.778 2.991 3.192 3.416 3.629
2900 1.114 1.334 1.555 1.775 1.995 2.216 2.425 2.645 2.677 3.097 3.306 3.538 3.759
3000 1.152 1.38 1.608 1.83 2.064 2.292 2.508 2.738 2.976 3.204 3.42 3.66 3.888
Selection Criteria of CROSS-FIN COIL
  1. Front passing wind speed of COIL

    If the front passing wind speed of the cooling COIL is 2~3m / s or more, install an eliminator behind the cooling COIL. Select the heating coil within 4m/s.

  2. Evaporation temperature of refrigerant

    If the evaporation temperature of the refrigerant is low, the power cost increases due to the low efficiency of the refrigerator although the ability of the cooling coil increases. On the contrary, if the evaporation temperature becomes higher, the power cost is reduced but a large heat transfer area should be selected. Therefore, please consider the economic aspect of the evaporation temperature, and also note that condensation occurs on the surface of the FIN when the evaporation temperature is low, which will also require measures.

  3. The flow direction of refrigerant and air

    To increase the efficiency of COIL, please set the flow of refrigerant or heat medium and air so as to become COUNTER FLOW.

  4. Selection of required flow rate

    For the water speed of the pipe in the cold and hot water COIL, 0.8 ~ 1.2 m/s is good for the efficiency of the water coil as well as for the piping and pump equipment cost.
    Divide the required flow rate by the number of COIL steps, check the flow rate, and select the shape of the HEADER from the half flow (HF), single flow (SF) and double flow (DF).

  5. Coil capacity margin

    Depending on a load of cooling and heating of the COIL, add 50% for 1 row, 50% for 2 rows, and 20% for 4 rows or more to the selected number of rows required, whichmakes the final number of rows.

※ The header of cold and warm water coil can use the following three circuits according to the flow velocity of passing fluid.

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COIL Air Pressure Loss Table
If the FIN surface is wet
(COOLING WATER COIL, DX /COIL)
If the FIN surface is dry
(HOT WATER COIL, STEAM COIL)
Correction coefficient table of the air static pressure loss according to FIN PITCH
FIN PITCH 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Correction coefficient 1.7 1.33 1.13 1.00 0.91 0.83 0.77
Pressure loss in cold and hot water coils
Calculation method of pressure loss in cold and hot water coils

When using a cold and hot coil, the contracted pressure loss is obtained from the quantity for 1 tube pass and the effective length of the tube.

  • Cooling heat : 38,000 (kcal/h)
  • Coil specification : 6ROW x 18PASSES x 0.95m
  • Quantity : 38,000/(60 x 5) = 126.7(ℓ/min)
  • Temperature difference of hot/cold water inlet and outlet : 5℃
  • Quantity per tube : 126.7 / 18 = 7.04 (ℓ/min)
  • Since the tube length is 0.95m, the water pressure loss difference from the below chart is 0.15mmAq
  • Water pressure loss difference 0.15mmAq
  • Total pressure loss (Total pressure loss ) = 0.15 x 6ROW = 0.9 mmAq