Re: [EnergyPlus_Support] Re: Help with VAV to Constant Air Volume

[Karen Walkerman <kwalkerman@xxxxxxxxx>]

One thing to check is the number of unmet thermostat setpoint hours.  This is often the reason for high energy use differences between two models.  One may be using much less energy, but it is also not meeting the setpoint temperatures.  Also, check to make sure that each piece of equipment is sized properly in both models.  It's possible that the equipment is significantly oversized, and the VAV system was able to make up for this by significantly reducing the supply air flow.

I can't think of any reason you can't change from a VAV to CAV system in the manner you describe.

--

Karen

On Fri, Nov 18, 2011 at 10:35 AM, energyplus.1984 <energyplus.1984@xxxxxxxxx> wrote:

 

I have also posted my CAV with high heating and VAV files for reference

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "energyplus.1984" <energyplus.1984@...> wrote:
>
> Hi,
>
> I converted my Variable Air Volume file to Constant Air Volume and my heating consumption has increased by almost 6 times. The weather file used is Chicago. What are the possible reasons that would lead to such a change?
>
> To do the VAV conversion i converted Zone HVAC Air Loop Terminal Units to Constant Volume, Fans to constant volume, removed the damper. My file is running without errors.
>
> Is my method of making it Constant Volume ok? Any help is appreciated.
>
> Thanks,
>
> J
>

__._,_.___

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

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 currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___