[Equest-users] 答复: what's the default equipment control?

[Dahlstrom, Aaron]

Joey –

I have had the same (counter-intuitive) experience. (ie load a, then load b+c, then load b+c+d …)

I didn’t end up solving it for my building. All my chillers were identical in capacity and part-load curve. I also had one chiller in the plant that never got turned on (ie my load never exceeded the capacity of my plant). Since those were the case, I assumed that the energy cost was the same as if there were a more intuitive control (load a, then load a+b, then load a+b+c). There appears to be an anamoly in your sample where “b” runs by itself for a while (why?) but as long as capacity, part load, etc are identical between chiller the outputs should be similar to the intuitive loading, I believe.

I did have to do a little explaining as to why the PS-C reports came out as they did.

Aaron

Aaron Dahlstrom , PE, LEED® AP
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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jiao, Joey
Sent: Thursday, March 22, 2012 2:48 AM
To: John Aulbach; Equest-users at lists.onebuilding.org
Subject: [Equest-users] 答复: what's the default equipment control?

Hi John & everyone:
Thank you for your helps , I just check that, but it seems different than we thought.
The PS-H report show the chiller water loop run hours. I add it in the form, so you can get it clear.
Equipment control

Chiller 1a

Chiller 1b

Chiller 1c

Chiller Water Loop

None

2126

624

607

2750

Chiller1~3 to seq 1~3

2750

607

0

2750

All Chillers seq 1

2750

2750

2750

2750

Now you can find that , the loop run hours for all control types is 2750.
If the default control type as we thought , the chiller 1a should be 2750 equal to the run hours of  Chiller Water Loop, because in any situation , the chiller 1a should first and always be used.
Maybe I think too much. But it is a software , I think there must be a sample and clear way for the default control.
Thank you for your help again.

Joey


发件人: John Aulbach [mailto:jra_sac at yahoo.com]<mailto:[mailto:jra_sac at yahoo.com]>
发送时间: 2012年3月22日 13:20
收件人: Jiao, Joey; Equest-users at lists.onebuilding.org<mailto:Equest-users at lists.onebuilding.org>
主题: Re: [Equest-users] what's the default equipment control?

Joey:

I am guessing, but I BELIEVE Chiller-1 gets to a certain load (think it's defined in the chiller setup), then Chiller-1 and Chiller-2 share the load until Chiller-3 is needed, when all three share the load.

See if that makes sense.

John Aulbach
Partner Energy

________________________________
From: "Jiao, Joey" <Joey.Jiao at WSPGroup.com.cn<mailto:Joey.Jiao at WSPGroup.com.cn>>
To: Equest-users at lists.onebuilding.org<mailto:Equest-users at lists.onebuilding.org>
Sent: Wednesday, March 21, 2012 7:49 PM
Subject: [Equest-users] what's the default equipment control?

Hi, everyone:
What’s the default equipment control when a loop with more than 1 plant?
At first I think the default should be” chiller1a- sequence 1, chiller 2a-sequence2, …” or all the chillers with the same sequence 1.
But my experiment shows it different than my think .
 I make a system with 3 chiller and make a calculation under different control way.
The result run hour shows below:
Equipment control

Chiller 1a

Chiller 1b

Chiller 1c

None

2126

624

607

Chiller1~3 to seq 1~3

2750

607

0

All Chillers seq 1

2750

2750

2750

So I’m puzzled with how should the software control more than 1 plant when there is no equipment control set?
[cid:image001.png at 01CD080E.2649FD80]
Any suggestion should be appreciated.
Thank you very much.

Joey

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