Re: [EnergyPlus_Support] free cooling questions

["Michael J. Witte" <mjwitte@xxxxxxxx>]

1.  For your purchased air simulation (and probably in general for a commercial 
building) I would use the dual setpoint thermostat control (control type=4) all 
year.  This will automatically switch between heating and cooling as needed, 
regardless of time of year.

2.  How to schedule free cooling heat exchanger?  I see the documentation is 
not very clear.  If I understand correctly, the first field named "Setpoint 
Schedule" is used along with "Free Cooling Control Mode" to determine if the 
heat exchanger should operate.  In the Input Output Reference, the description 
of this is under the second field names "Setpoint Schedule" which is now an 
unused filed, but the I/O ref was not updated to reflect this.  If this does 
not work, let me know, and I will check with the model developer.

3.  Instead of using HEAT EXCHANGER:HYDRONIC:FREE COOLING, you may find it 
easier to use the new feature HEAT EXCHANGER:WATERSIDE ECONOMIZER.

Mike


On 5 Dec 2007 at 14:09, olifpp wrote:

> Hi, all:
> 
>       I am doing a simulation of a building which can utilize 
> cooling water directly from condenser loop (cooling tower and so 
> on).  In this building, there are some larger interior zones which 
> also have cooling load on some days in winter, and I think the 
> cooling water from the condenser loop is lower in winter and can be 
> utilized to substitute the chilled water. 
>       The first question is that: how can I get the actual cooling 
> load of the interior zones in winter. I have built a purchased air 
> model for the building. In the ¡° zone control Thermostatic¡± , I 
> used the ¡°single heating setpoint ¡°and¡± the single cooling 
> setpoint¡± ,and the ¡°zone control type¡± is ¡°winter 1¡± and 
> ¡°summer 2¡±. Then I got the result that the cooling load of all the 
> interior zones in winter is 0, but actually, it should not be zero. 
> How can I get the actual cooling load in winter?
>       The second question is : ¡° the free cooler which is set up 
> parallelly with the chiller can being open ¡°on¡± in winter. How to 
> set the schedule?
>    Thanks very much for your suggestion!
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
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> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
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> 
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> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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