[TRNSYS-users] Too high solar efficiency

[Rami Al-Assad via TRNSYS-users]

Hi Jordi,

I think the problem related to Type 1b as you connect the
Ground reflected diffuse radiation on horizontal --> Ground reflectance
where the ground reflectance is a constant value and mostly equal to 0.2

hope this will solve the problem

Regards,
Rami

On Mon, Jul 25, 2016 at 1:51 PM, Jordi Jove via TRNSYS-users <
trnsys-users at lists.onebuilding.org> wrote:

> Hi,
>
> I am working in a solar district heating simulation project and I am
> getting a solar collecotr efficiency over 64%, which is impossible. I am
> refering to the ratio between incident radiation to the collectors, and the
> energy gain by them:
>
> total radiation on tilted surface: 1,93 MWh/m²/year
> useful energy gain by collectors: 1,23 MWh/m²/year
>
> So, I connected something erroneously, but I can not find the right way. I
> tried Quadratic Collector type1a and type1b and I got the same excessive
> efficiency.
>
> In the first one TYPE1a the connections with weather data are the
> following:
>
>       Ambient temperature-->Ambient temperature
>       Total radiation on tilted surface-->Incident radiation
>
>
>
> In type 1b the connection are the following:
>
>       Ambient temperature-->Ambient temperature
>       Total radiation on horizontal --> Total horizontal radiation
>       Sky difuse radiation on horizontal --> Horizontal diffuse radiation
>       Ground reflected diffuse radiation on horizontal --> Ground
> reflectance
>       Total radiation on tilted surface --> Incident radiation
>        Angle of incidence for tilted surface -->  Incident Angle
>       Slope of tilted surface --> Collector slope
>
>
> I really need to solve this problem, thanks.
> Jordi
>
> ---
> Jordi Jové Manonelles
> *jovejm at gmail.com <jovejm at gmail.com>*
>
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>
>


-- 
Rami Anton Al-Assa'd
Tel: 00962 7 88726129
P.O. Box 151201
ِِJordan 13115 Az Zarqa
E-mail: ramianton at Gmail.com
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