Re: [EnergyPlus_Support] Modelling Simple Heating and Ventilation Equipment

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

1a.  In EnergyPlus, the only way to introduce outside air (ventilation air) in 
an HVAC system is to use a mixer, even if the relief air flow rate will always 
be zero.

1b. Yes, it is always recommend that you combine into one system whenever 
possible if the model will be equivalent.

2.  This depends on how the system will be controlled.  If the supply air 
temperature from the ventilation system is fixed, then use DIRECT AIR.  If each 
zone has independent control of its supply air temperature, then use SINGLE 
DUCT:CONST VOLUME:REHEAT.

3.  Yes, it is recommended that you do so.

Mike


On 11 Jan 2008 at 17:56, brandao_nuno wrote:

> Dear All,
> 
> I´m simulating a small buiding with heating and ventilation only
> requirements. The system consists of two inlet air flow ventilators,
> each coupled with one heating coil. A boiler supplies hot water to the
>  heating coils and hot water radiators(multiple radiators distributed
> to a total of four zones). My questions are as follow:
> 
> 1. The systems does not recirculate the air, so I don´t need an air
> mixer. Is it possible to simulate the two fans(summing the total of
> the two individual fans capacity - the same for the heating coils) as
> one in an only air primary loop?
> 
> 2. Which is the best choice for simulating the system? Single
> Duct:Const Volume:Reheat coupled with a fan or a Direct Air System
> coupled with a heating coil and a fan? Are these solutions possible?
> 
> 3. Is it possible to simulate multiple hot water radiators as one big
> for each of the four zones? Each zone as a total of four hot water
> radiators.
> 
> Thanks in advance
> Nuno Brandao
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
> 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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