Maximum HVAC Systems

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Dear All,
How many HVAC systems can be created to model a building with multi-zones?
I am doing energy consumption modeling for an existing club house building. There are rooftop units with gas heating, split AC units, split heat pumps and gas furnace with split DX coils, etc. All the units have different capacity and EER too.
Regards,
Lisa Li

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Hi, Lisa,

I am not clear what's your point, but I can state that one zone have only
one system assigned (exception only baseboard). And one building can have
more than one system to condition different zones: condition or ventilation
only, or uncontidtion.

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Lisa,

I believe the upper limit on # of unique systems follows the upper limit
on # of zones, which is something higher than 1,000 but I'm not certain
where the sidewalk ends in the current version 3.64. If you should have
more than 1,000 zones or systems to include in one building, you might
need to use multiple models.

A more probable limit for most situations is the number of zones
actually defined - and this relates to Grammy's point about 1 system per
zone: If you only have 15 zones, you can't complete a simulation with
more than 15 systems. It follows that you need a minimum of 15 spaces
to define 15 zones. The important point to take away here is that you
really must, at a minimum, define at least one distinct space to
correspond to each system when you are considering and creating your
building geometries.

The building design you're describing thus far sounds perfectly do-able
within eQuest.

NICK CATON, E.I.T.

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Nick and Grammy,
Thanks a lot.
I was confused by SD input that only allows maximum 2 HVAC system.
Lisa Li

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