I believe Dennis intended to say: "you want the coolant entering the heat
exchanger on the side the air is leaving".

Larry A.

On Sat, Nov 27, 2021 at 10:56 AM Dennis Haynes <d23haynes57@hotmail.com>
wrote:

> From the equipment life and reliability perspective there is no
> difference. From the heat transfer performance there is but since this coil
> is relatively small and the coolant flow available relatively great you
> probably will not notice the difference.
>
>
>
> From the design point of view for heat transfer coils the preferred flow
> would be for the source medium (coolant) to counterflow the medium being
> heated or cooled. In other words you want the coolant entering the heat
> exchanger on the side the coolant is leaving. This arrangement provides the
> greatest temperature rise. There are situations where this is not done for
> example, heating systems taking in air at freezing temperatures in systems
> not using antifreeze. Especially if the coolant is throttled for control.
> The objective there is to prevent the coil from freezing.
>
>
>
> Dennis
>