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

[Leonard Sciarra]

Seth, also Heat Capacities are listed for various blocks/block fill/concrete in Appendix A of 90.1.


Leonard Sciarra
Senior Associate
+1 (312) 577.6580 Direct
+1 (847) 345.5619 Cell

Gensler
11 East Madison Street
Suite 300
Chicago IL 60602

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Andy Hoover
Sent: Wednesday, March 24, 2010 8:34 PM
To: 'Seth P. Spangler'; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] ASHRAE 90.1 "HC" heat capacity

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

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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, LEED(r) AP
Project Engineer

RMF Engineering, Inc
Ph: (843) 971-9639 ext:1497
Fax: (843) 971-9641
sspangle at rmf.com
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