What Really Happens on the Water Side of Finned Pack Heat Exchangers?

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Another point to note is that without proper calculations it is very hard to predict the effect of changes in operating conditions. In some cases the same coil may work fine even for a large change in heat load; at other times even a small change in the duty will require an entirely different coil.

Conclusions

When designing a coil, conditions on both the air and water side are important. After any change in the design specification the engineer must anticipate the need to change the coil design, besides considering the consequences on the water side and the air side. Water and air parameters are interlinked. For a particular coil and a given air inlet flowrate and temperature, we can freely select only two out of the following three parameters: water inlet temperature, water outlet temperature, and water flowrate. These conclusions apply to cooling as well as heating coils, and to systems using brine (glycol) as well as water.

Figure 2: In this kettle-type plate-and-shell evaporator, off-centre mounting of the plate pack provides room for vapor to disengage (Picture: Gesmex)

* Vojtěch Harok is with Lloyd Coils Europe Ltd., Praha/Czech Republic

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