[Bldg-sim] CFM per ton

Larry Degelman ldegelman at suddenlink.net
Fri Mar 1 06:31:44 PST 2013


Khristiam,

Is it possible that your space has extremely high latent (moisture) loads?
Your results would indicate an SHR (Sensible Heat Ratio) of only around 0.5,
which doesn't seem typical for office occupancies.

e.g., 300 cfm would give a sensible cooling of around 6600 Btu/h.  SHR =
6600/12000 = 0.55.

Regards,

LOD
===============================
Larry O. Degelman, P.E., BEMP, HBDP
Professor Emeritus of Architecture
Texas A&M University
===============================
-----Original Message----- 
From: Khristiam Alvarez
Sent: Thursday, February 28, 2013 3:10 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] CFM per ton

Dear Sirs

I made a simulation of two one floor building for offices.
The results indicate the following:
Area / Sypply / Design Capacity
2810 sqft / 3974 cfm / 271cfm/ton
1017 swft / 1306 cfm / 302cfm/ton

Why the software gives these results so differente from the usual rule
of thumb 400cfm/ton?

Thank you very much.

-- 
Khristiam Alvarez
Ingeniero Mecánico

Proyecto Hidroeléctrico Tocoma, Módulo 4
Proyectos Mecánicos
Estudios e Ingeniería de Expansión
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