Re: [EnergyPlus_Support] Condenser Loop

[Nacho Gomis <nachogo27@xxxxxxxxx>]

I need the third loop because I want to know the consumption of this third loop pump.I want to compare this system with another system which is the typical system with a cooling tower in the condenser loop.

Thanks Brent,I will continue with my study.

I've attached another model that I thought before reading your email.It is a SVG file which I have prepared to translate into energy plus objects.Is this model behaviour similar to the model you have suggested me with the ThermalStorage:ChilledWater:Mixed object?

Thanks,

Ignacio Gomis

On 21 March 2012 16:58, Griffith, Brent <brent.griffith@xxxxxxxx> wrote:

 

I my view, the heat exchanger is not really needed. For energy modeling, you just need 30C water going into the chiller.  So just run district chilled water at 30C for the â??condenserâ?? loop and ignore the rest of the actual system. 

 

If you really must have tank and the third loop, I would use a chilled water storage tank (input object ThermalStorage:ChilledWater:â??Mixed).  Tank setpoint temperature at 30C.  Use Side connected to chiller condenser plant loop.  Source Side connected to district chilled water plant loop with setpoint at 17C. 

 

The HeatExchanger:Hydronic model has known issues and you should probably stay away from it. 

 

From: EnergyPlus_Support@â??yahoogroups.com [mailto:EnergyPlus_Support@â??yahoogroups.com] On Behalf Of Nacho Gomis
Sent: Wednesday, March 21, 2012 4:18 AM
To: EnergyPlus_Support@â??yahoogroups.com

Subject: Re: [EnergyPlus_Support] Condenser Loop

 

 

Brent I didn't understand very well what you wrote but I have looked into the example files and I found something near to what you told me.

 

One of the files is PlateHeatExchanger.idf

This simulation, if we see the side of the condenser, has two condenser loop which are linked by HeatExchanger:Plate object. The secondary condenser loop has a cooling tower which I dont want to have.I thought it can be replaced by this cooling tower by DristictCooling object.Is it allowed to use this object for a condenser loop?In the same way,is the thermal storage and the water heater objects allowed to be used in a condenser loop?

 

Because I found another example file, FreeCoolingChiller.idf which is very similar.the difference is that it couples a condenser loop and plant loop by HeatEchanger:Hydronic object.Because now I have a plant loop,it is allowed to use a DistrictCooling object.

 

Am I going in the right direction with that examples files?

 

Ignacio Gomis

 

On 20 March 2012 17:22, Griffith, Brent <brent.griffith@xxxxxxxx> wrote:

 

I would suggest using a PlantLoop that is served by DistrictCooling on the chillerâ??s condenser side.   

 

From: EnergyPlus_Support@â??yahoogroupâ??s.com [mailto:EnergyPlus_Support@â??yaâ??hoogroups.com] On Behalf Of Nacho Gomis

Sent: Monday, March 19, 2012 5:22 PM
To: EnergyPlus_Support@â??yahoogroupâ??s.com
Subject: [EnergyPlus_Support] Condenser Loop

 

 

Hi,

I'm wondering how to model my condenser loop. I want to replace the cooling tower by a system which use a natural water storage to cool the water in the condenser loop.

I want to use a heat exchanger to couple the condenser loop and the water from the natural storage.

The volume of the natural storage is very big,so the temperature is always 17ºC.I thought to model it as a tank but I didn't find the right object.

Could someone give some advices about which objects could help to my purpose?

I will attach a scheme of the system that I want to model.

Thanks,

Ignacio Gomis

 

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