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<p>Aditi,</p>
<p>It really depends on what performance data you have available for the solar collector you'll be using. Type 71 and 538 use a quadratic efficiency equation and Type 1288 uses the 6 parameter model from the EN12975 standard. Beyond that, Type 538 is somewhat similar to Type 71 but offers more features (outlet temperature control, impact of mass, etc.)</p>
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<p>Jeff</p>
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<pre>---<br />Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577 Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton@tess-inc.com
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<p>On 10/04/2017 11:03 am, Aditi Garg via TRNSYS-users wrote:</p>
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<div>Dear TRNSYS user,</div>
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<div>I would like to know how should we select the evacuated tube for solar water heating. I am unable to know which will be better, type 1288 , type 538 or type 71?</div>
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<div>I have tried reading them through theory but still unable to decide. I would really appreciate if anyone can help me with them.</div>
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<div>thank you</div>
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<div><span style="color: #000000;"><span style="background-color: #ffffff;"><span style="font-size: 12.8px;"><span style="font-family: arial,helvetica,sans-serif;"><strong>Regards</strong></span></span></span></span></div>
<div><span style="background-color: #000000;"><span style="color: #999999;"><span style="color: #000000;"><span style="background-color: #ffffff;"><strong style="font-family: arial,helvetica,sans-serif; font-size: 12.8px;">Aditi Garg</strong></span></span><br /></span></span></div>
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