<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Ahmad,</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">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 <a href="http://www.solar-rating.org">www.solar-rating.org</a></div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">Jeff</div><div id="AppleMailSignature">TESS Inc</div><div id="AppleMailSignature"><br><br>Sent from my iPhone</div><div><br>On Apr 29, 2017, at 7:14 AM, ahmad abbasian via TRNSYS-users <<a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<p><span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">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? </span><br clear="all" style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">
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Ahmad abbasianzadeh</div>
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Solar energy Researcher</div>
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<b>Harrisburg, Pensylvania</b></div>
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