Re: [EnergyPlus_Support] Re: Run around coil for air loop

[Sam Roose <sam@xxxxxxxxxxxxxxxxxxxxx>]

Thanks Don. You were right first time ­ a heat exchanger assisted cooling
coil was what I was after.
I have uploaded a progress file to the ³Problem Submittals/ Sam Roose
folder² which runs, but has some node connection errors (I am not concerned
about the other erros at this stage). I have made an attempt at the air loop
branches (there are two separate loops), however I am not sure that putting
just the fan, heating coil and heat exchange assisted coil onto this branch
is sufficient. The one example file I have found for this (which uses
FurnaceHeatCool) uses the Air Loop Outlet Node as the exhaust node for the
heat exchanger air but there appears to be a problem with this node in my
file. How can I get rid of these node connection errors? Thanks in advance
Sam Roose
Energy Solutions Ltd.

On 1/22/05 1:59 AM, "donbshireyiii" <shirey@xxxxxxxxxxxx> wrote:

> 
> Sam,
> 
> I'm not sure if E+ is able to model what you are proposing.
> 
> However, I do know that you can use the object
> COIL:Water:CoolingHeatExchangerAssisted which uses the chilled water
> cooling coil along with a sensible heat exchanger (Heat Exchanger:Air
> to Air:Flat Plate or Heat Exchanger:Air to Air:Generic)
> to improve the dehumidification performance of the cooilng coil by
> pre-cooling the air entering the cooling coil, and then reheating the
> air leaving the cooling coil. While this doesn't have a "pump"
> associated with it, you might be able to use it anyway to meet your
> needs. See the documentation (IO Ref and Engineering Doc) for
> information regarding its use.
> 
> Also, there is an example file called
> FurnaceWithDXSystem_CoolingHXAssisted.idf which shows how the similar
> object COIL:DX:CoolingHeatExchangerAssisted is used for a direct
> expansion (DX) cooling coil. This example might be helpful for you to
> see how the heat exchanger supply and exhaust air nodes are hooked up
> correctly in the air loop (i.e., supply side of the heat exchanger is
> the "precool" coil and the exhaust side of the heat exchanger is the
> "reheat" coil).
> 
> Don
> 
> 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Sam Roose <sam@e...> wrote:
>> > I have just uploaded a file attempting to employ a run around coil
> in an air
>> > loop (named "9run_around_coil_attempt.idf" in the "Problem
> Submittals/Sam
>> > Roose" folder. I haven't found any examples for this as yet but the
> order of
>> > elements in the air loop should be:
>> > 
>> > Supply fan (blowing air through at around 23 degrees in summer)
>> > Main heating coil (taking hot water from a boiler - maintaining 23
> degrees
>> > in summer as it is switched off)
>> > Run around cooling coil (cooling to around 18 degrees)
>> > Main cooling coil (taking chilled water from a chiller and cooling
> to 10
>> > degrees)
>> > Run around heating coil (Heating to 15 degrees would allow 15 degree
> water
>> > to come back to the run around cooling coil thus reducing cooling
> load -
>> > this is done using a pump).
>> > 
>> > I am not sure what this run around system would require in the way
> of a
>> > water loop, and how the heat recovery could be simulated. Any help
> on this
>> > is much appreciated.
>> > 
>> > Sam Roose
>> > Energy Solutions Ltd.
> 
> 
> 
> 
> 
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