[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [EnergyPlus_Support] Vertical Ground Heat Exchanger



Urban:

1. Check all the node mass flow rates around the loop on both demand and supply sides.  You should be able to see an overall mass balance in the system and that will help identify where the rest of the flow is going (likely down a bypass pipe as Brent stated).

Edwin

On Tue, Jan 4, 2011 at 18:02, Griffith, Brent <brent.griffith@xxxxxxxx> wrote:
 

1.        I?d guess there is one or more bypass pipes that get some of the flow and explain why they aren?t the same. 

2.       That heat transfer is driven by the operation of the plant equipment inside the building and that has not changed with a different borehole field.  You should see some significant differences in loop operating temperatures, but not necessarily that heat transfer rate because nothing much has changed on the demand side of the loop.

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of urbantomc
Sent: Tuesday, January 04, 2011 3:35 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Vertical Ground Heat Exchanger

 

 

Hi everyone.

I have some questions regarding vertical ground heat exchangers.

1. Why is the mass flow in the vertical GHE different from the water
mass flow at the source side of the heat pump? Shouldn't they be the same?

2. When I've simulated vertical GHE with borehole configuration of 1×2 and
then of 4×4 (same depths) for the same building, the output parameter
'VERTICAL GROUND HEAT EXCHANGER:Ground Heat Exchanger Heat Transfer[W](Hourly)'
showed approximately the same values. Why is that so? Does that output
parameter mean the heat transfer of a single borehole?

Any help would be really appreciated.

Regards,

Urban




__._,_.___


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

__,_._,___