[TRNSYS-users] solar collector

[Farah, Sleiman - farsy019]

Hello Saja,

Make sure your flat plate collector is facing the equator. If this input is incorrect and the collector is due north, the useful energy will increase as the collector slope decreases.

Hope this helps.

Regards,

Sleiman Farah

 P please consider the environment before printing this email

From: trnsys-users-bounces at cae.wisc.edu [mailto:trnsys-users-bounces at cae.wisc.edu] On Behalf Of saja al-rifai
Sent: Friday, 23 May 2014 11:31 PM
To: TRNSYS-users at cae.wisc.edu
Subject: Re: [TRNSYS-users] solar collector

Hello,
I need to answer this question please....

I'm simulating different types of solar collector. I want to investigate the effect of collector slope on useful energy. When I increase the collector slope of flat plate collector type 1b, the useful energy from collector decreased and the maximum useful energy occurred at 0 deg angle (horizontal), even though the latitude for my region 32 deg, which meaning the useful energy should be increase and not decrease at angles near the latitude angle .
but when I used the evacuated tube type 71, the useful energy increased with angle.
I returned to the TRNSYS mathematical reference, flat plate and evacuated tube collectors used the same thermal model and different IAM model.
in case of flat plate collectors the IAM for both sky and diffuse radiation depends on the collector slope, if collector slope increase the effective sky and diffuse angle decrease, resulted in decrease the IAM, collector efficiency and useful energy. these results according to TRNSYS mathematical description.
 practically, the useful energy should be increase for flat plate as evacuated tube when the collector slope increase.
does someone have an idea about this issue?

saja

On Wednesday, May 21, 2014 2:01 PM, saja al-rifai <srhihi2003 at yahoo.com<mailto:srhihi2003 at yahoo.com>> wrote:

Hello,

I'm simulating different types of solar collector. I want to investigate the effect of collector slope on useful energy. but if I increase the collector slope when I use the flat plate collector type 1b, the useful energy from collector decreased and the maximum useful energy occurred at 0 deg angle (horizontal), even though the latitude for my region 32 deg, which meaning the useful energy should be increase and not decrease at angles near the latitude angle .
but when I used the evacuated tube type 71, the useful energy increased with angle.
I returned to the TRNSYS mathematical reference, flat plate and evacuated tube collectors used the same thermal model and different IAM model.
in case of flat plate collectors the IAM for both sky and diffuse radiation depends on the collector slope, if collector slope increase the effective sky and diffuse angle decrease, resulted in decrease the IAM, collector efficiency and useful energy. these results according to TRNSYS mathematical description.
 practically, the useful energy should be increase for flat plate as evacuated tube if the collector slope increase.
does someone have an idea about this issue?

saja


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