[Bldg-sim] ERV with increasing cooling load

Xiaobing Liu XLiu at climatemaster.com
Tue Oct 28 08:15:47 PDT 2008


I'm wondering whether the Mixed Air Reset will really be implemented in the real system? How big difference the air temperature control strategy will make?
 
Xiaobing

-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org]On Behalf Of eric wang
Sent: Tuesday, October 28, 2008 10:06 AM
To: bldg-sim at lists.onebuilding.org; Kingsley, Michael L.
Subject: Re: [Bldg-sim] ERV with increasing cooling load



Hi,
 
Thanks a lot for all your replies. I changed the following settings and solved the problem.
 
Control Sequences Operation: when minimum OA 
Make air temperature cotrol: Mixed Air Reset
 
Best,
 
Shaojie

--- On Tue, 10/28/08, Kingsley, Michael L. <MICHAEL.L.KINGSLEY at saic.com> wrote:


From: Kingsley, Michael L. <MICHAEL.L.KINGSLEY at saic.com>
Subject: RE: [Bldg-sim] ERV with increasing cooling load
To: shaojieworld2006 at yahoo.com, bldg-sim at lists.onebuilding.org
Date: Tuesday, October 28, 2008, 8:09 AM


Shaojie,



Check to make sure that you are not recovering heat during hours that

you can be using the economizer.  Choose the Control Sequences:

Operation: "When Minimum OA" so that the heat recovery device will

only

operate when you cannot benefit from free cooling.



Mike



Michael L. Kingsley, PhD, PE, LEED AP

Senior Engineer/ Project Manager

SAIC

6390 Fly Road

East Syracuse, New York 13057

Phone:  (315) 437-1869  x205

Cell:     (315) 373-4081

Fax:     (315) 437-1866

Email:  kingsleym at saic.com



-----Original Message-----

From: bldg-sim-bounces at lists.onebuilding.org

[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of eric wang

Sent: Monday, October 27, 2008 11:32 PM

To: bldg-sim at lists.onebuilding.org

Subject: [Bldg-sim] ERV with increasing cooling load



Hi,

 

I model a PSZ system with exhaust air heat recovery. I set the static

pressures of supply/exhaust fans as zero in ERV tab. Therefore, the fan

energy is the same with or without ERV. However, there is an increasing

cooling load in the cooling model. I changed the hourly report and

didn't find the reason. Any suggestions are highly appreciated.

 

Thanks

 

Shaojie 




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