Dear all,
I am currently working on a hot sanitary water system with a solar collector and a storage tank, and I have chosen Type 534 for the tank because it seemed to be able to cover all my modeling needs.
However I have not found much information on a couple of topics: If I use the version without the plug-in I cannot choose Propylene Glycol as a fluid and instead I have to input a single value for the physical properties. Is there a way to not use the plug-in and be able to have time-dependent properties?
Furthermore, I have struggled a lot to try to grasp what "HX cross-sectional area" is, I have finally decided that for the coil HX case it must be pi*(CoilPipeOuterRadius-CoilPipeInnerRadius)^2, however the default value from TRNSYS is quite higher (two orders of magnitude higher), is my interpretation correct? I have also found other default values to be far away from the ones that I am using, such as the HX wall conductivity, which is two orders of magnitude lower than I would expect, does this mean I should not be using TRNSYS default values for those parameters I have no information on? (such as heat transfer phenomena inside the coil).
Finally, I have set miscellanous flows to zero, despite not being entirely sure of what they are, I suppossed they would only be used in case of external energy flows, but instead, in order to do that I am using the auxiliary gains.
Kind regards,
O.C.