[Bldg-sim] ASHRAE 90.1 "HC" heat capacity

[Andy Hoover]

Hey Seth:

 

Check with the title 24 folk in CA.  I believe they  have/had tables and
http://www.buildex.com/smartwall/tables/tpocmw.html buildex has some tables
showing differing constructions HC.

 

Andy Hoover

Principal

The BEST Consultant, Inc.

Cell: 678-793-1159

Office: 678-200-7648

Fax: 678-827-0574

Email: andyhoover at thebestconsultant.com

Web: www.thebestconsultant.com

 

LEGAL DISCLAIMER
The information transmitted is intended solely for the individual or entity
to which it is addressed and may contain confidential and/or privileged
material. Any review, retransmission, dissemination or other use of or
taking action in reliance upon this information by persons or entities other
than the intended recipient is prohibited. If you have received this email
in error please contact the sender and delete the material from any
computer.

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Seth P.
Spangler
Sent: Wednesday, March 24, 2010 9:44 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] ASHRAE 90.1 "HC" heat capacity

 

Hello,

 

ASHRAE defines a mass wall as a wall having a heat capacity (HC) of greater
than 7 BTU/ft2 * F but I have been unable to find this property listed in
tables of building materials. I am trying to calculate the heat capacity of
a CMU wall and would like to confirm that my calculation methodology is
correct.

 

Per ASHRAE 1997 Fundamentals:

.         8" concrete block - two cores filled with concrete (normal weight)
- ~130 lb/ft3

.         Thickness .67 ft

.         Specific Heat ~ 0.22 BTU/lb * F

 

Therefore NC =(130 lb/ft3 )*(.67 ft)*(0.22 BTU/lb * F)

 

NC=19.16

 

Using this methodology even a 4" brick wall has a HC greater than 7 (7.5 to
be exact).

 

Thanks in advance.

 

Seth Spangler, LEEDR AP 

Project Engineer

 

RMF Engineering, Inc 

Ph: (843) 971-9639 ext:1497

Fax: (843) 971-9641 

sspangle at rmf.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20100324/660fba8d/attachment.htm>