How can I model this heat pump system?
The details of the system are: Heat is covered by a ground source heat pump which is feeding some baseboards/floor heating. Further an air to water heat pump is present to supply additional heat, if needed. The system should also have mechanical ventilation with heat recovery, and with cooling supplied from an air-water heat pump
Please help.
This is a very broad question, which members probably won't be able to provide you with a comprehensive answer for. I suggest you ask about one or two specific things you're struggling with with respect to modeling your system.