RE: [EnergyPlus_Support] Heat Recovery from a GenSet

["Jim Dirkes" <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Thanks, Adil.  With your comments and Brent’s, I think I now have a good a better idea of how to proceed and am in the middle of preparing the IDF.

 

The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Adil SMH
Sent: Thursday, February 23, 2012 7:43 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Heat Recovery from a GenSet

 

I remember thinking in the same lines. After many node brach trails we did it. In our case we had an Absorption chiller as well which was connected to mixed hot water loop. This is all done with a carefull priority schedule in mind. I suggest go with WaterHeat:Mixed way to interface the two loops. Yours is a bit easy as you are not using the same heating loop for Absorbtion chiller. I can say that this is a tested one for the situation. Additionally in Plant equipment list, define the priority as you intend it to run and heatingplantequipmentOperation:heatingload shall be defined based on Heatrecovery capacity of DG.

One more idea which will give you quick start in your situation is that you expand required or somilar HVAC template with "n" number of boiler and then change that (n-1)th boiler with InternalCombustionengine, In braches, splitter and mixers.(few other places as well) Do load traking on electrical or thermal what ever suits.

 

Hope that help,

 

Adil SMH.

--- On Thu, 23/2/12, Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

From: Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Subject: [EnergyPlus_Support] Heat Recovery from a GenSet
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Date: Thursday, 23 February, 2012, 12:59 AM

Dear Forum,

I am beginning to model a heating system which uses heat recovered from a diesel engine electricity generator.  The diesel generator operates during the peak electrical demand portions of the day, when it’s recovered energy is the primary source of heat for the building.  During the remainder of the day, a boiler provides the heat.  The boiler also serves as a “second stage” of heating during the day.

I have shown the system in the attachment as I envision it, but have doubts about whether that will work in EnergyPlus.  My cause for doubt is that I essentially show one plant loop feeding another plant loop. 

This is somewhat similar to an example in the IO Reference for HeatExchanger:Plate, but the IO Reference discussion also says the object is intended specifically for condenser loops � which this is not.

I have also thought that perhaps a WaterHeater:Mixed might work instead of the HeatExchanger if I define the WaterHeater natural gas capacity as 0, since I want to use only the recovered energy.

Finally, I thought that some recent discussions on the forum may have addressed this, but I was not paying close attention at the time could not find them today.  If there was such a discussion, I’d be happy if you just gave me a date or search term so I could find it.

 

So, in short:

1.       Has anyone done something similar?

2.       Am I starting in the right direction?

3.       Any other advice?

Thanks in advance for your help!

 

 

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