Hello,

I?m working on a hotel that has an air cooled chiller, the guest rooms are
conditioned by fan coil units and the outdoor air is provided via a DOAS
that uses natural gas for heating. According to the energy cost budget
method each system should be mapped one-to-one on figure 11.5.2. The fan
coils will be mapped as system 8 (heat pump), but I am not sure how to map
the dedicated outside air system, I thought to model it identical to the
proposed building, but that means a chiller needs to be added to the
baseline model which does not make sense to me. I thought of using only
system 8 for conditioning and providing the outside air to the guest rooms,
but the energy cost budget requires to model the secondary heating source
identical to the proposed model so I am not sure how to separate the
heating source for outside air from the space heating. Any thoughts on how
to model the baseline?

Thank you,