Hi Ioannis,
Since I can't add attachments to replies, I edited your post to upload the attachments. I have attached:
- Model presentation: A conference presentation outlining the model and validation
- Draft technical manual: A detailed technical manual illustrating the derivation of the model. Note, this manual is a bit out of date and hasn't been published yet.
The model handles the tank temperature by checking to see if it has exceeded the maximum set temp, and sets it to the maximum set temperature if it has exceeded it. This simple mechanism simulates opening a relief valve as you say, though any additional complexities aren't captured. Note, this only occurs for the computed bulk tank temperature, not the hot or cold node temperatures. So locally, the temperature appears to be able to exceed the max set temperature.
Does that answer your question?
Thanks,
Nick