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I'm using a CoolingTower:VariableSpeedthat supplies water to my chiller. You can choose mostly between two empirical models:

• YorkCalc
• CoolTools (crossflow).

I'm interested in knowing which one I should pick.

I have noted a couple of factual differences. First, YorkCalc uses 27 coefficients while CoolTools uses 35, but that's not a very useful piece of information to have.

More interestingly, the model boundaries differ quite significantly, YorkCalc accepts a broader range of conditions.

From the Engineering Reference, Tower Heat Rejection, Table 64:

For the record, YorkCalc is the default in E+.

Does this mean YorkCalc is valid for a broader range of conditions, and would be better?

Do you have any guidance as why I should choose one or the other?

I'm using a CoolingTower:VariableSpeedthat supplies water to my chiller. You can choose mostly between two empirical models:

• YorkCalc
• CoolTools (crossflow).

I'm interested in knowing which one I should pick.

I have noted a couple of factual differences. First, YorkCalc uses 27 coefficients while CoolTools uses 35, but that's not a very useful piece of information to have.

More interestingly, the model boundaries differ quite significantly, YorkCalc accepts a broader range of conditions.

From the Engineering Reference, Tower Heat Rejection, Table 64:

For the record, YorkCalc is the default in E+.

Does this mean YorkCalc is valid for a broader range of conditions, and would be better?

Do you have any guidance as why I should choose one or the other?