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Re: [TRNSYS-users] Tinlet<Tamb collector

Fernando,
The efficiency equation holds true whether the inlet temperature is above or below the ambient temperature. If the inlet temperature is higher than ambient, then the collector loses energy to the ambient. If the inlet temperature is lower then the ambient the collector gains energy from the ambient. The sign of the loss term changes but the underlying equation form stays the same. 
Kind regards,
 David


On 1/26/2011 07:47, Sancho,Fernando wrote:

Hello Trnsys-Community;

I want to simulate a Solar loop where the inlet temperature to the collector field is constant (12ºaprox.)and usually lower than ambient temperature.
In this case I CAN NOT use the regular collector efficency equations, can I?
I read it somewhere and  it makes sense, we would get a positive gain in the term with (Tinlet-Tamb) but still losses in the cuadratic one...
How can I model this situation from the ASHRAE data of the collector?

Thanks a lot
Any tip would be appreciated



Fernando Sancho
PHÖNIX SonnenWärme AG

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