Re: [EnergyPlus_Support] HVAC capacity - autosize and fixed

[Don Shirey <shirey@xxxxxxxxxxxx>]

Please send the input data files for your two cases (COP = 2,94 and COP = 2.39) to the EnergyPlus helpdesk via e-mail to:

EnergyPlus-Support@xxxxxxxx

In your e-mail, describe which version of EnergyPlus you are running and the weather file you are using for the simulation.


-------- Original Message --------

Subject:	[EnergyPlus_Support] File - IMPORTANT - EnergyPlus Support
Date:	Sun, 22 Feb 2009 17:05:30 +0000
From:	EnergyPlus_Support@xxxxxxxxxxxxxxx
Reply-To:	EnergyPlus_Support@xxxxxxxxxxxxxxx
To:	EnergyPlus_Support@xxxxxxxxxxxxxxx

Dear EnergyPlus Users:

In order to better serve you, a helpdesk system has been set up for
managing EnergyPlus user support requests.  The helpdesk system
includes a download area, a knowledge base and troubleshooting area.  

To submit new support requests (tickets) or search the knowledge base,
please go to http://energyplus.helpserve.com

You may also submit new tickets and reply to tickets via e-mail at
EnergyPlus-Support@xxxxxxxx   This address has been linked to the
helpdesk since early May 2008.

EnergyPlus_Support@xxxxxxxxxxxxxxx will now be a user-to-user forum,
with occasional input from the EnergyPlus development team.  

** If you have an unresolved issue which was posted to the yahoo
group, please resubmit your request to EnergyPlus-Support@xxxxxxxx 
Please include any replies to date and attach input files as needed.

Sincerely,

The EnergyPlus Team

Joyce Carlo wrote:

 

Dear all,

 

We noticed that the HVAC capacity is changing according to different COP by using the autosize option for Cooling Coil Capacity. For example, for the same HVAC: if the COP is 2,94 the result  in the eio file for the total capacity  is 62726Watts and, if that cop is decreased to 2,39 the capacity becomes 94906Watts.

 

Then, we tried to fix the capacity to change only the COP value. But we got a severe error:

Sizing: COIL:DX:COOLINGBYPASSFACTOREMPIRICAL "AC_ZN_1 COOLING COIL": Rated air volume flow rate per watt of rated total cooling capacity is out of range.

 

We also tried to put the minimum, average and maximum value of rated air volume rate (times the capacity as required) but we got the same severe error.

 

Our questions are:

-          Why the capacity is changing according to cop? Should not it be according to zone loads and design days??

-          If no rated air volume flow is accepted, how do we use the HVAC Cooling Coil Capacity without autosize option?

 

Thanks,

Labeee team.

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.

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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.

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