Re: [EnergyPlus_Support] Detailed ICE storage - for PCMs? Nodes & curves question

[Dru Crawley <dbcrawley@xxxxxxxxx>]

You can run all design days but it is not necessary. Dr. Li is correct you only REQUIRE two (heating/cooling).  I have seen buildings that have cooling peaks in September rather than July so I often will include an extra design day or two in September/October (ASHRAE has included monthly design conditions in the Fundamentals for awhile now).  It does depend on the building configuration and systems.  (That said, for research purposes, you may want to consider more than the single heating and cooling peaks.)

 

On Sat, Jul 21, 2012 at 2:54 PM, Linda Lawrie <linda@xxxxxxxxxxxxxx> wrote:

 

Correction -- I would not have said that.  I would have said it depends on your system -- and that the guidance is given in the ASHRAE HOF about what kind of design conditions are appropriate for which systems.  Now, if you do use the full set that we produce for each ASHRAE HOF location -- you will probably get the blanket ones accomplished.

In addition, there are the "monthly ASHRAE design conditions" which could be used.  We will generate those for the current ASHRAE HOF for the Spring 2013 release (or earlier).

At 12:49 PM 7/21/2012, CleanTech Analytics wrote:

1. I have heard mixed messages about design day objects- for instance I have been told that all design day objects should be ran to produce accurate sizing by Linda & Drew, but told by Paulo the same as you say of only two needed. For using two I wonder what is the best way to choose the correct design days, and for some time thought it made more since to use Weather file:extreme summer week/Weather file:extreme winter week so that I could run the same building at many locations during parametric runs and so I did not have to make arbitrary choices of Design Days. Lately I have just been running files with all Design Days to be on the safe side.  I guess ASHRAE standards would be a good place for me to research for the best day type to choose/use. (your advise on this was appreciated)

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