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Thread: Questions
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01-01-2006, 11:21 PM #12
Re: Questions
Enhanced heat transfer surface use depends on the film coefficients for each side of the surface. When using refrigerant to cool or heat air, the air film coefficient is much lower than the refrigerant side.
Therefore there is little to be gained by using enhanced heat transfer surface on the refrigerant side.
For water to refrigerant, the water film coefficient can be quite high, so enhancement on the water side would be beneficial. In this case, the refrigerant side enhancement can help.
The lower film coefficient can be said to be the controlling limit, so if the enhancement is on the wrong side very little is gained at a potentially significant cost.
The High-flux tubing is very interesting. One of the drawbacks to it is that you need some minimum temperature difference to start the nucleation and capillary effect of the sintered tubing. In some cases (from reports I have read) this type of heat transfer surface can take some time to reach it's full potential for heat transfer.
If I remember correctly, the tubes must first heated to initiate the capillary action of the surface, then the entire surface must reach it's full potential for all nucleation sites on the tubing.
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