Project Building with too many spaces

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Hi everyone,

I am working in a very large building, which has many different space usage
types.

The HVAC Project consists in a lot of AHUs, constant volume, fan coil units
and active chilled beams.

The issue is that there are almost 1500 spaces distributed in the different
systems.

I am a little disoriented because I started modeling my Project Building
with each one of the AHUs without discriminating each space, but this AHUs
attend different space usage types, for instance, one of them is for the
?Pharmacy?, and it attends circulation, office spaces and storage.

According to the number of floors, building area and heating source, my
Baseline HVAC system will be System 7, Variable air volume with reheat. So I
will assign one VAV AHU for each floor. And then, how will I assign each VAV
zone?, do I have to model all the 1500 spaces or will it be enough to model
a VAV box for each AHU as defined in the Project Building?,

I will really appreciate your comments on this,

Thank you,

Paula

Ingeniera Paula Andrea Hern?ndez LEED AP (BD +C)

Capitulo Argentino de ASHRAE Board Member - Region XII MP RVC

Estudio Ingeniero Mario Pedro Hern?ndez

Tel./Fax: 4302-9561 Tel.: 4303-3481

Av. Montes de Oca 1103 5? D - C.A.B.A.

Web Site: www.mphingenieria.com.ar

e-mail:
paulahernandez4 at fibertel.com.ar

via Equest-users's picture
Joined: 2016-07-15
Reputation: 400

Take a look at Table G3.1. The sub sections on Thermal Blocks and HVAC
Systems describe how you can combine individual spaces into model zones
which will go a long way towards simplifying your model.

Anthony Hardman, PE, BEAP, LEED AP BD+C

Senior Building Performance Analyst

The Green Engineer, Inc.

Sustainable Design Consulting

54 Junction Square Dr.

Concord, MA 01742

O: (978) 369-8978

D: (978) 610-2801

C: (720) 840-7862

The Green Engineer, Inc. is a Certified B Corporation

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Reputation: 400

Thank you Anthony,

I read it many times, but wasn?t sure, will keep thinking!,

Paula

Ingeniera Paula Andrea Hern?ndez LEED AP (BD +C)

Capitulo Argentino de ASHRAE Board Member - Region XII MP RVC

Estudio Ingeniero Mario Pedro Hern?ndez

Tel./Fax: 4302-9561 Tel.: 4303-3481

Av. Montes de Oca 1103 5? D - C.A.B.A.

Web Site: www.mphingenieria.com.ar

e-mail:
paulahernandez4 at fibertel.com.ar

De: Anthony [mailto:Anthony at GreenEngineer.com]
Enviado el: jueves, 12 de enero de 2017 07:28 p.m.
Para: 'Paula A Hern?ndez'
;
equest-users at lists.onebuilding.org
Asunto: RE: [Equest-users] Project Building with too many spaces

Take a look at Table G3.1. The sub sections on Thermal Blocks and HVAC
Systems describe how you can combine individual spaces into model zones
which will go a long way towards simplifying your model.

Anthony Hardman, PE, BEAP, LEED AP BD+C

Senior Building Performance Analyst

The Green Engineer, Inc.

Sustainable Design Consulting

54 Junction Square Dr.

Concord, MA 01742

O: (978) 369-8978

D: (978) 610-2801

C: (720) 840-7862

The Green Engineer, Inc. is a Certified B Corporation

via Equest-users's picture
Joined: 2016-07-15
Reputation: 400

While ASHRAE's guidance sets a "floor" for the "minimum resolution" of detail for your zone geometries, that minimum is most likely to be set by the proposed case system(s) as the baseline case should match the proposed, so I would start there.

With such a large project - it will be advantageous to be relatively "aggressive" in combining zones/spaces with similar load profiles. Consider also whether it may be advantageous to utilize shell/floor multipliers.

Consider also that the wizards have some built-in capacity to help you create "combined occupancy" zones through the optional zone allocation screens for each shell. You can for example specify that a given floor/shell's "Core" zone is 60% open office, 20% corridors, and 10% mechanical/electrical rooms, and the wizards will generate interior load profiles, occupancy densities, etc. unique to that shell. Utilizing this feature is another option in your toolbox to consider.

Probably also worth noting there are some (simple) illustrations in the 90.1 user's manual to illustrate the minimum resolution of zoning as prescribed in appendix G. It's quite similar to the "core/perimeter" zoning as the wizards will generate with relatively simple shell floor plates.

Best of luck!

~Nick

[cid:image002.png at 01D26DB8.890A2840]
Nick Caton, P.E., BEMP
Senior Energy Engineer
Energy and Sustainability Services
Schneider Electric

D 913.564.6361
M 785.410.3317
E nicholas.caton at schneider-electric.com
F 913.564.6380

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

[cid:image001.png at 01D189AB.58634A10]

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