Re: [DML] Re: What temperature should AC be on normal setting?

[Nick Kemp <nkemp@xxxxxxxx>]

For a fixed heat exchange (12,000btu from my reply) the airspeed does 
not make a difference.

On 7/26/2012 5:59 PM, Paul Gress wrote:
>
> On 07/25/12 08:20 PM, Nick Kemp wrote:
> > Room temperature change (delta T) will be the same in both cases. What I
> > think you are getting at is the temperature off the coil. Slow air will
> > be cooler but less is moved. Fast air will be warmer but more is moved.
> >
> > In a room, with a 12,000 BTU heat exchange via a heat pump, the
> > resulting room temp will be the same regardless of the airspeed over the
> > coil. The system removes 12,000 BTU.
>
> The room should be warmer. Even though the air may be getting colder, 
> there is air less moving, thus decreasing the delta t between the 
> evaporator and moving air.
>
> The net result will be less transfer of btu.
>
> > The question at hand is "what maximizes the cooling capacity of the heat
> > pump, fast air or slow air?
> >
> >
> >
>
> Fast air. In any heat exchanger, when you increase air flow and 
> turbulence you increase its efficiency to exchange heat. You cannot 
> increase its efficiency by slowing down air flow.
>
> [Non-text portions of this message have been removed]
>
> 


[Non-text portions of this message have been removed]



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