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<p>Li,</p>
<p> I am not sure whether or not anyone responded to your question.
You would definitely have to write a new collector model or begin
with Type74 and modify the code extensively. You would need to
determine at what point in the collector the liquid begins to
vaporize and you would need to make a call to the FluidProperties
routine to determine the properties (temperature, enthalpy,
density, etc.) of the R134A as it travels through the collector.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 02/27/2020 01:44, Guanming Li via
TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:tencent_3118365F63A34DD92E496A394B31A69FF308@qq.com">
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charset=gb18030">
<div>Dear TRNSYS users,</div>
<div><br>
</div>
<div>Thanks for your help!</div>
<div>Only the specific heat capacity is set in the collector
module, but if I want to use R134a, the working medium will
undergo a phase change in the collector, and the specific heat
capacity will also change. </div>
<div>I want to ask for help, how to use this working medium in a
collector for a direct expansion solar heat pump?</div>
<div><br>
</div>
<div>Best regards！</div>
<div><br>
</div>
<div>Guanming Li</div>
<div> </div>
<br>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
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