[Hap-users] How to input thermal masses on HAP?

[Eric Rivera]

Hello All,

I am investigating the use of Phase Change Material for a supermarket in Nicaragua and its impact on cooling load capacity.  The phase change manufacturer we are working with sent us the following information to input into HAP:


M27 Heat Capacity

M51 Heat Capacity

Thickness [m]

0.027

0.051

Conductivity [W/m-K]

1.8

1.8

Density [kg/m3]

810

810

Specific Heat [J/kg-K]

13,384

13,384


The manufacturer said that he ran a similar model in eQuest and said that we should've seen a 20% reduction in the cooling load.  However, when I run the load calcs, the total cooling load capacity is similar to the cooling load of the baseline roof.   I entered the following information for the M51 material for the roof under the Roof Properties, as shown below (I had to enter the material twice because HAP only allows a max specific heat value of 8.37 KJ/kg/K).

[cid:image001.jpg at 01D00F9F.EB3B8EB0]

My question is: am I inputting the thermal mass information right, or is there a better workaround to this?  Has anyone had experience with modeling phase change material in HAP?

Thanks,



[cid:image001.jpg at 01CCAE92.6FC59620]

Eric Rivera
25501 west valley parkway
olathe ks 66061
direct: 913.344.0036
main: 913 345.2127
fax: 913 345.0617

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/hap-users-onebuilding.org/attachments/20141204/bd1ead04/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 30419 bytes
Desc: image001.jpg
URL: <http://lists.onebuilding.org/pipermail/hap-users-onebuilding.org/attachments/20141204/bd1ead04/attachment.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 1778 bytes
Desc: image002.jpg
URL: <http://lists.onebuilding.org/pipermail/hap-users-onebuilding.org/attachments/20141204/bd1ead04/attachment-0001.jpg>