PSZ w/ furnace heating loads

8 posts / 0 new
Last post

I'm trying to create my baseline model for a school on Gallipolis OH. I have the school broken into 5 zones and am using PSZ units. The space loads seem to be modeling fine, I'm just having a problem getting the heating and cooling loads under control. Using the 90.1 prescribed supply-air-to-room temperature difference of 20? and a dead band of 5?, I end up with a heating
design capacity of 80 btu/hr/sqft.

I was wondering if other people have run into that same problem and how it may be resolved. I'll seen more information if it will help I just don't want to take too much space.

Cyrus Grimes .

Cyrus Grimes's picture
Offline
Joined: 2011-09-30
Reputation: 0

You should attach your .inp to the email. Maybe someone will be able to
help. I agree that your heating design capacity seems high. When you say
that your heating and cooling loads are not under control do you mean that
they are too high or that they are not meeting the loads?

--
Steve Mignogna

Steve Mignogna's picture
Offline
Joined: 2011-09-30
Reputation: 0

Don't forget the .pd2 file as well...

Aulbach, John's picture
Offline
Joined: 2011-09-30
Reputation: 0

OK. Here they are. The loads are too high as far as I can tell. I have multiple zones slaved to one control zone. The slave zones do not report any control problems, although there may be some. My proposed design is going to be a VRV system. I've distributed the zones similarly to how they be covered by the primary heat pumps for the VRV's. I think that this as compliant as I can be to app. G.

Cyrus Grimes .

From: Steve Mignogna [mailto:smignogna at gmail.com]
Subject: Re: [Equest-users] PSZ w/ furnace heating loads

You should attach your .inp to the email. Maybe someone will be able to help. I agree that your heating design capacity seems high. When you say that your heating and cooling loads are not under control do you mean that they are too high or that they are not meeting the loads?

--
Steve Mignogna

Cyrus Grimes's picture
Offline
Joined: 2011-09-30
Reputation: 0

Indeed it looks like a very high heating power installed. Did you have a
look to check that your system is not simultaniously cooling and heating
(Cold deck reset --> constant)?

*Xavier Garc?a Casals*

=?ISO-8859-1?Q?Xavier_Garc=EDa_Casals?='s picture
Joined: 2011-09-30
Reputation: 0

OK. Here they are. The loads are too high as far as I can tell. I have multiple zones slaved to one control zone. The slave zones do not report any control problems, although there may be some. My proposed design is going to be a VRV system. I've distributed the zones similarly to how they be covered by the primary heat pumps for the VRV's. I think that this as compliant as I can be to app. G.

Cyrus Grimes .

From: Steve Mignogna [mailto:smignogna at gmail.com]
Subject: Re: [Equest-users] PSZ w/ furnace heating loads

You should attach your .inp to the email. Maybe someone will be able to help. I agree that your heating design capacity seems high. When you say that your heating and cooling loads are not under control do you mean that they are too high or that they are not meeting the loads?

--
Steve Mignogna

Cyrus Grimes's picture
Offline
Joined: 2011-09-30
Reputation: 0

I'll try again

OK. Here they are. The loads are too high as far as I can tell. I have multiple zones slaved to one control zone. The slave zones do not report any control problems, although there may be some. My proposed design is going to be a VRV system. I've distributed the zones similarly to how they be covered by the primary heat pumps for the VRV's. I think that this as compliant as I can be to app. G.

Cyrus Grimes .

From: Steve Mignogna [mailto:smignogna at gmail.com]
Subject: Re: [Equest-users] PSZ w/ furnace heating loads

You should attach your .inp to the email. Maybe someone will be able to help. I agree that your heating design capacity seems high. When you say that your heating and cooling loads are not under control do you mean that they are too high or that they are not meeting the loads?

--
Steve Mignogna

Cyrus Grimes's picture
Offline
Joined: 2011-09-30
Reputation: 0

How can I post a BDL or INP file for others to review?

Cyrus Grimes .

Cyrus Grimes's picture
Offline
Joined: 2011-09-30
Reputation: 0