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<p>Mohamed,</p>
<p>Most HVAC devices in TRNSYS that use a refrigerant (heat pumps, chillers, etc.) are typically modeled using the concept of a look-up performance data file approach. The very short timesteps required to accurately model the dynamics of a refrigeration cycle would cause many simulation to run a long time. I'm not sure what you are trying to accomplish with your research but if it's a detailed study of the CO2 cycle then I would recommend a program like EES (which can couple with TRNSYS). If you are just wanting to use a CO2 heat pump in your studies then I would suggest finding performance data for the unit that you are considering and then building a performance map and using one of the existing HVAC components.</p>
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<p>Jeff</p>
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<pre>---<br />Jeff Thornton
President - TESS LLC
3 N. Pinckney Street, Suite 202, 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 01/19/2021 7:55 am, Mohamed Tawfeek via TRNSYS-users wrote:</p>
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<p class="MsoNormal">Hello, <!-- o ignored --></p>
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<p class="MsoNormal"><span>I am trying to generate a model that includes CO2 heat pump in Trnsys. I wonder if some module already exists. I also can’t find CO2 refrigerant in TYPE 58 (refrigerant and system properties) Does it exist in a different module or can I purchase it extra? <!-- o ignored --></span></p>
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<p class="MsoNormal"><span>Thanks for your help <!-- o ignored --></span></p>
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<p class="MsoNormal"><strong><span style="mso-fareast-language: SV;"><!-- o ignored --> </span></strong></p>
<p class="MsoNormal"><span style="font-size: 10.0pt; mso-fareast-language: SV;">Med vänlig hälsning<strong>,<!-- o ignored --></strong></span></p>
<p class="MsoNormal"><strong><span style="font-size: 10.0pt; mso-fareast-language: SV;">Mohamed Tawfeek <!-- o ignored --></span></strong></p>
<p class="MsoNormal"><span style="font-size: 10.0pt; mso-fareast-language: SV;">Energikonsult<!-- o ignored --></span></p>
<p class="MsoNormal"><span style="font-size: 10.0pt; mso-fareast-language: SV;">+46 (0) 76-577 23 18<!-- o ignored --></span></p>
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<p class="MsoNormal"><span style="font-size: 8.0pt; color: black; mso-fareast-language: SV;"><a href="http://www.sens.se/"><span style="color: #0563c1;">www.sens.se</span></a></span><span style="color: black; mso-fareast-language: SV;"><!-- o ignored --></span></p>
<p class="MsoNormal"><span style="mso-fareast-language: SV;"><img id="Picture_x0020_1" style="width: 1.4513in; height: .4791in;" src="cid:391a7454bbdc3aa7b2974a4d0945f37a@tess-inc.com" alt="" width="139" height="46" border="0" /><!-- o ignored --></span></p>
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