Re: [TRNSYS-users] evacuated solar collector

[Jeff Thornton via TRNSYS-users <trnsys-users@lists.onebuilding.org>]

Ahmad,

Most evacuated tube solar collectors are tested near 72 kg/h/m2.  You should find the test report for the collector you would like to use - it'll contain the efficiency parameters, incidence angle modifiers and the test flow rate.  SRCC publishes a large set on their website www.solar-rating.org

Jeff

TESS Inc

Sent from my iPhone

On Apr 29, 2017, at 7:14 AM, ahmad abbasian via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:

for evacuated solar collector, the flow rate at design conditions is 3kgr/hr.m2 as default. using 6m2 as collector area , If I use 18kgr/hour flow rate , the outlet temperature is acceptable. But this is really low flow rate and I wonder that the collector test flow rate is too low. I need 3000 kgr/hr flow rate to be heated by solar energy but using this value for flow rate, I get unacceptable outlet temperature. changing the "flow rate at test conditions" to a high number like 300 also leads to unacceptable temperatures. what should I do? 

..............................................................................................

Ahmad abbasianzadeh

Solar energy Researcher

Harrisburg, Pensylvania

 

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