WSHP Hotel Room Energy Modeling

3 posts / 0 new
Last post

Ok so this may be a dumb questions.  I've started modeling a roughly 90,000 SF Hotel (for LEED) in which the Mechanical contractor (design build) wants to install a water source heat pump loop such that each individual room will have it's own water source heat pump.  As I'm putting my rooms in and starting to zone the spaces - with fan energy in mind - it occurs to me (seemingly) that each individual hotel room should be zoned as a separate system in order to accurately model fan energy.  Does anyone know if this is the correct approach?  I'm not seeing another way to do it accurately (I can't just add up the total KW of the fans as they will not all cycle the same way).   I would end up with around 120 systems in this building if I take the system per zone approach which seems kind of crazy to me. Thanks for your response.

Pearlyp's picture
Offline
Joined: 2012-08-09
Reputation: 2

It's a common question and common mistake. However, this topic is really TRACE 101. You could enter 1 system for each heat pump. However, that is unnecessary because TRACE already knows to put 1 heat pump per zone.

It's covered in detail here: http://energy-models.com/training/trace-700/rooms-and-systems

Bob's picture
Bob
Offline
eQUEST UserLEED AP BD+CTRACE 700 User
Joined: 2010-06-30
Reputation: 275

Bob - thanks for the response.  I kind of thought that was the case.  Here's my follow up question though.  If I don't treat these heat pumps as individual systems (which I haven't yet because of the absurdity of the thought) - how does Trace know how to apply the fan power.  i.e., I have 100+ rooms but only one system.  Therefore since I only have one system, I only have one place I can input fan power.  Now I suppose I could put in the total energy consumption of all the fans, however this seems inaccurate (to me) as not all fans will cycle simultaneously (varying loads, occupancy, etc.). It's all about the fan power that makes me think I can't accurately model this with a single system.

Pearlyp's picture
Offline
Joined: 2012-08-09
Reputation: 2