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

Re: [EnergyPlus_Support] "Rating Conditions" for Water to Water Heat Pumps



Karen,
 
standard def of Rating conditions -  set of operating conditions under which a single level of performance results, and which causes only that level of performance to occur. For heat pumps the water source temperature ( water loop) temperature defines your rating condition.
 
Water loop may be a groundloop system or a hybrid or a cooling tower/boiler system. Water loop temperature (Entering water temperature) differs on all these systems.  Each system has different water loop  temperature and this defines your rating on the HP's.
 
Any catalog would have listed the performance for a selected unit for different entering water conditions (usually the EWT defines the rating ).
 
Air side usually same on all type of systems.
 
 
Let me know this helps.
 
Thanks,
 
PS

 
On Mon, Nov 14, 2011 at 1:28 PM, Karen Walkerman <kwalkerman@xxxxxxxxx> wrote:
 

Chandra,


Thanks a million!  I missed that the rated conditions are also included in the excel spreadsheet.

Jim - I just got a response from the manufacturer that there is currently no official "rating condition" for these units!!  No wonder I couldn't find anything on such a rating.

--
Karen


On Mon, Nov 14, 2011 at 12:50 PM, Chandan Sharma <csharma@xxxxxxxxxxxx> wrote:
 

Also, these "Rated" conditions are same which user specifies in the E+ object. (absolute page 107/196 of the attached document or link below)
http://www.hvac.okstate.edu/research/Documents/Tang_Thesis_05.pdf



On 11/14/2011 12:28 PM, Jim Dirkes wrote:
 

Dear Karen,

 

?Rating? conditions are normally the AHRI test conditions. For typical DX coils, these are 95F outdoor, 80F dry bulb / 67F wet bulb coil entering temps.  I am not sure about the conditions for heat pumps.

 

The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

<





__._,_.___


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

__,_._,___