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

Re: [EnergyPlus_Support] Re: Urgent: VRF System EER and IEER in E+ Output Reporting for LEED, how to get them?



Richard, it would be a great help if e+ could 1) calculate IEER and other standard ratings for all equipment (certainly on the developement list, right?) and 
2) also for the system...here I mean that you should include the supply/exhaust air moving fans and other power consumers as it seems that data reported by manufacturers for at least unitary equipment do this and the baseline ratings in ASHRAE 90.1 also include this...at least this is my conclusion from my own calcs.

On 11.09.2014, at 00:46, "rraustad RRaustad@xxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

If you look at the VRF EIRFPLR curve (Figure 10, pg 32 here
http://www.fsec.ucf.edu/en/publications/pdf/fsec-cr-1910-12.pdf) you can
see that you could calculate the IEER. The problem is that the
calculated IEER from this curve would most likely be much lower than
what is reported by the manufacturer. This is a result of how VRF
systems are tested according to ANSI/AHRI Standard 1230. I believe the
same IEER equation is used as 210/240, I'd have to check.

If you look at this document,
http://www.daikinac.com/content/assets/DOC/AHRI-1230.pdf, on pg 2 you
will see very high IEER's compared to the EER. The only way this can
happen is if the part-load EER's at 25%, 50%, and 75% are very, very
high. Looking back at the curve in figure 10 from above, it's hard to
understand how the IEER is reported by manufacturers as being so high.

On 2014-09-10 08:46, hisham.rashrash@xxxxxxxxx [EnergyPlus_Support]
wrote:
> Dear Jean, thank you very much.
> I thought of modeling the actual sizes and requesting IEER from
> manufacturer, but I found actual sizes are less than autosized
> capacities by around 20%; so there will be unmet hours if I do so,
> besides that it seems impossible to model any IEER with e+, because we
> can't see the result of any curve we might use, this is.. if we could
> find out how to define that curve in the first place =(
>
> I must submit tomorrow =((
>
> Please, advise.
>
> Hisham
>
>
>
> Links:
> ------
> [1] http://energyplus.helpserve.com
> [2] http://www.energyplus.gov
> [3] http://groups.yahoo.com/group/EnergyPlus_Support/
> [4]
> https://groups.yahoo.com/neo/groups/EnergyPlus_Support/info;_ylc=X3oDMTJldDhhNWsyBF9TAzk3MzU5NzE0BGdycElkAzMzODc0ODgEZ3Jwc3BJZAMxNzA1MDA3Mzg5BHNlYwN2dGwEc2xrA3ZnaHAEc3RpbWUDMTQxMDM1MzIxMA--
> [5]
> https://groups.yahoo.com/neo/groups/EnergyPlus_Support/members/all;_ylc=X3oDMTJma3VvY2R1BF9TAzk3MzU5NzE0BGdycElkAzMzODc0ODgEZ3Jwc3BJZAMxNzA1MDA3Mzg5BHNlYwN2dGwEc2xrA3ZtYnJzBHN0aW1lAzE0MTAzNTMyMTA-
> [6]
> https://groups.yahoo.com/neo;_ylc=X3oDMTJkdThpOGdoBF9TAzk3NDc2NTkwBGdycElkAzMzODc0ODgEZ3Jwc3BJZAMxNzA1MDA3Mzg5BHNlYwNmdHIEc2xrA2dmcARzdGltZQMxNDEwMzUzMjEw
> [7] https://info.yahoo.com/privacy/us/yahoo/groups/details.html
> [8] https://info.yahoo.com/legal/us/yahoo/utos/terms/



__._,_.___
Posted by: "jeannieboef@xxxxxxxxx" <jeannieboef@xxxxxxxxx>


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.




__,_._,___