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TESS is pleased to announce the availability of a newly implemented model of a two-pipe VRF air handler.
The component models an air source heat pump in which a single outdoor unit serves multiple indoor units. In a two-pipe configuration the indoor units must all either be in heating mode or cooling mode. A mixed mode in which some indoor units are in heating mode while others are in cooling mode is not possible. Not all the indoor units need to be active; some may simply be OFF. As is the case for many of the TRNSYS HVAC components, the performance of the VRF air handler is based on a performance map.
The component is being offered as an individual component for the time being. More information is available by visiting:
https://trnsys.com/tess-libraries/individual-components.php.html
hello
Is there a tutorial on how to develop a VRF heat pump model in TRNSYS?
@oumaima The new Type (Type1254) includes a documented example. I would not really call the example a tutorial because while the documentation explains the details of the completed example, it doesn't really take you step by step through setting up a model. I can share the documentation with you if you'd like. Please email me directly: techsupport@tess-inc.com
kind regards,
David
Hello David,
I have sent you an email about this type1254. I am interested in know about if the model is simplified based on manufacturer curves or if it is a more detail model based on physics. I would like to see the documentation before to buy this new component. Would be possible?
Francisco, For some reason I did not receive the email but I think I found yours so I will send you the documentation. I am afraid that the model is based on performance data from manufacturers and not on physics.
David
Don't worry David, I have paid this type and I am happy with how it works. Only one question, the number of zones served by the heat pump is limited to 10?
This could be a limitation in VRF applications with high power heat pumps which serve more than 10 zones.
@franciscofh Francisco, the 10-zone limit is a soft one; it can be modified by editing the proforma and recompiling the code with a different limit. If you need a version with a higher limit, please let me know and I can make it for you.
kind regards,
David
@davidbradley perfect! Great news! I can modify the type without problems. Thank you for your help
