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The forum is a place where people can interact and have discussions about different topics involving the use of the TRNSYS software package. Here you can post topics for discussion or questions on using TRNSYS and get advice from other users or TRNSYS experts. This forum is not intended for detailed technical support. Users should contact their distributor’s hotline for such assistance.
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Thank you!
The psychrometric routines in the TRNSYS kernel are valid well below 0C so there should be no problem using Type56 (or the other building models) for low temperature situations.
As far as the system components are concerned, most of the hydronic models (tanks, pipes, pumps, etc.) assume that the specific heat, density, and other physical properties of the working fluid are constant. It is very common to set glycol fluid properties for the systems that maintain the building at those low temperatures.
The only place you'd need to be careful is with components that experience a phase change. If that is a concern in your system and you can add a little more information about what equipment will see a phase change then I can perhaps give you some additional pointers.
kind regards,
David
