[TRNSYS-users] Too high solar efficiency

[Jordi Jove via TRNSYS-users]

Hi Rami,
Thanks for your answer, but that just reduces the efficiency a little bit
to 58%.
- total radiation on tilted surface: 1,93 MWh/m²/year
- useful energy gain by collectors: 1,12 MWh/m²/year

I don't know where is the problem I have checked the parameters units and
looks correct, Maybe I am not using the right solar collector, but what I
would like to simulate is  a normal plate collector surface without
movement, always with the same slope.


Looking forward for solving it.

---
Jordi Jové Manonelles
*jovejm at gmail.com <jovejm at gmail.com>*

2016-07-25 13:51 GMT+02:00 Rami Al-Assad <ramianton at gmail.com>:

> 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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