[Hap-users] FW: HAP Cooling Load Calculation.

[Matthew Scott]

I'm sure someone will give you a better answer, but what you're looking
for is "Partitions". HAP has no idea where each room is relative to the
next one. You use the Wall and Ceiling Partition tab on the Space input
window to define a shared wall next to a space that is unconditioned or
at a different temperature. You define the Wall or Ceiling U-value
between the two spaces and then you set the max and min temperatures for
the neighboring space relative to two outdoor temperature extremes. HAP
then linearly calculates the neighboring space's current temperature at
any point in time base on the outside weather conditions at that point
in time.

 

For an unconditioned or partially conditioned basement below your
conditioned floor, you do a similar input using the Floor tab and
setting it to Above Unconditioned Space.

 

Good luck. I've been using HAP for 5 years now and it's been quite a
learning experience.

 

Matt Scott

N.E. Fisher & Associates, Inc.

329 East Second St, 2nd Flr

Boyertown, PA 19512

e: mscott at nefisher.com

p: 610-369-3190

f: 610-369-3194

 

From: hap-users-bounces at lists.onebuilding.org [
mailto:hap-users-bounces at lists.onebuilding.org] On Behalf Of Doddi, Sai
K
Sent: Tuesday, December 18, 2012 1:15 PM
To: hap-users at lists.onebuilding.org
Subject: [Hap-users] HAP Cooling Load Calculation.

 

Hello there,

                I am a new HAP user currently using HAP to assess the
cooling load for a train station. I am having trouble understanding
conceptually how HAP handles certain cooling loads. 

 

In my case, I have two adjacent rooms, one of which is air conditioned
to 68 deg F and 50% RH, and the other does not need any A/C, just
ventilation. There are a few set of rooms at one end of the station and
another set of rooms at the other end of the station. Some of the rooms
need A/C whereas some others don't.

 

In HAP, I haven't been able to figure out, how to assign an order to the
rooms. I would think this order is important to assess the heat transfer
between the rooms correctly and correspondingly calculate the overall
heat load.

 

In order to estimate the heat load, I would like to have an independent
a/c system for each room that needs to be airconditioned. Hence, I am
using 5 CAV's to air condition 5 spaces (rooms) and I am also using 4
CAV's to ventilation ( not A/C) to ventilate the 4 non-A/C rooms. Also,
there are corridors and windows.

 

As mentioned earlier, I haven't been able to figure out how to arrange
the rooms in an order and how to group them. In the space properties, I
see a tab for Partitions. But, it allows for a maximum of 2 partitions
only. I am not sure if this is the way to specify internal walls.

 

The tutorial only comes with 2 examples, that does not consider a case
where the rooms are conditioned differently.

 

Any suggestions would be greatly appreciated.

 

Thanks much,

Sai.

 

 

 

 

Sai Doddi | sai.doddi at hatchmott.com

Hatch Mott MacDonald 

111 Universal Hollywood Drive, Suite 2100, 

Los Angeles, CA 91436

Tel: 818-736-4314  Fax: 818-506-8044

http://www.hatchmott.com 

 

 

 

 

 

 

Sai Doddi | sai.doddi at hatchmott.com

Hatch Mott MacDonald 

111 Universal Hollywood Drive, Suite 2100, 

Los Angeles, CA 91436

Tel: 818-736-4314  Fax: 818-506-8044

http://www.hatchmott.com 

 



 


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