Take a look at this question. It's not an exact match to your configuration but is close. Note that the HeatExchangerFluidToFluid is added to the demand side of the HHW loop from the Library (objects not in the model but available to it) and the same HX is added to the supply side of the SHW loop from the My Model tab (objects in the model). You will also need to define a WaterUseEquipment definition in the Loads tab and link it to the one in the Service Hot Water loop.

HHW Loop

SHW Loops

Take a look at this question. It's not an exact match to your configuration but is close. Note that the HeatExchangerFluidToFluid is added I'll try to the demand side of the HHW loop from the Library (objects not in the model but available to it) and the same HX is added to the supply side of the SHW loop from the My Model tab (objects in the model). You will also need to define a WaterUseEquipment definition in the Loads tab and link it to the one in the Service Hot Water loop.update this answer with some images later.

Take a look at this question. It's not an exact match to your configuration but is close. I'll try to update this answer with some images later.