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



Paul is correct. If his explanation is unclear, take it to the extreme. Turn the air flow down to zero. Is it still transferring all that energy? No. HOWEVER, is there a point when increasing speed beyond which it makes a negligible difference? Yes. Turn it down a bit from there and it will make a negligible difference too.

Martin

Sent from my BlackBerry®

-----Original Message-----
From: Nick Kemp <nkemp@xxxxxxxx>
Sender: dmcnews@xxxxxxxxxxxxxxx
Date: Thu, 26 Jul 2012 18:31:09 
To: <dmcnews@xxxxxxxxxxxxxxx>
Reply-To: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] Re: What temperature should AC be on normal setting?

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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