[Equest-users] How to decied HVAC system type(with picture)

Jenny Zhang jenny.zhang at arup.com
Tue Apr 17 00:31:47 PDT 2012


Hi Aaron,
you could refer to G3.1.1 Exceptions a “ use additional system types for non-predominant conditions, if those conditions apply to more than 1900 sqm of conditioned floor area. It is not conflict.
For you case,  could the hospital floors can be considered as residential area? you should check it.
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Aaron
Sent: 2012年4月17日 11:35
To: equest-users
Subject: [Equest-users] How to decied HVAC system type(with picture)

Dear all
    I find contradiction between ASHRAE90.1-2007 Standard and ASHRAE 90.1-2007 User's Manual when deciding the baseline's HVAC system. Table G3.1.1A in Appendix G is used to decide the baseline HVAC as shown below
[cid:image001.png at 01CD1CAE.51567440][cid:image002.jpg at 01CD1CAE.51567440]
     The note under the table which i have underline say "Where attributes make a building eligible for more than one baseline system type, use the predominant condition to determine the system type for the entire building."  It seems that only one HVAC system will be used in baseline.
     However, in ASHRAE 90.1-2007 User's Manual , there is no explaination about the note. While the Case Study in Page G-37 of User's Manual tell us that two different types of HVAC system should be usedrespectively forthe Residential part and office part as shown below.So I think this conflict with the ASHRAE90.1-2007 StandardTable G3.1.1A.
   what about your views?
[cid:image001.png at 01CD1CAE.51567440][cid:image003.jpg at 01CD1CAE.51567440]
     If a hospital building includes mainly wards in 3~7 floors with an area of 132000ft2 and therapy zone in 1~2 floors with an area of 52000ft2, the proposed building is FCU served by chiller and boiler,  I tend to the PTAC system (system 1) for 3~7 floors and system 5  for 1~2 floors. what about your opinion?
     Thank you for any comments and directions.

     Aaron


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