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?



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.




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