Discussion

I posted almost exactly the same question about 6 months ago but no answer. It would be nice to find a more active SBEM forum somewhere!

If I have several DHW systems with the same fuel type (e.g. lots of local electric water storage heaters) I will tend to put them in as one system, add all the storage volumes together and take a pro-rata average of the storage losses.

In the case of different fuels I tend to assign the system which will have the higher use to the occupied space (in this case I would think the WC DHW demand would be higher than a classroom sink). I will then assign the classroom sink DHW to somewhere else in the building so it still takes the storage losses into account.

Like I said in the other thread, there is absolutely no guidance on this, so I have no idea whether this is right or not, but it's the best fudge I can come up with.

Peter