RE: [EnergyPlus_Support] Annual Peak cooling variable ?

See my comments below.

No need to reply to my comments, as there are enough said on this topic..

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jcrossett@xxxxxxxxxxxxxxx
Date: Mon, 17 Sep 2012 16:49:17 -0700
Subject: Re: [EnergyPlus_Support] Annual Peak cooling variable ?

Bent & Linda Thanks- Could I ask if this feature could be considered for any version of E+, and if you can understand why it would be left out of version 1?

No one, except you, would ask for the max peak value, to be displayed as a separate variable and cannot get it from the spread sheet yourself.

A simple program would extract the time and values from the ESO file, and give you an output, variable name, value min at time min, value max at time max..May be not simple, if you only code using Microsoft Visual series SDK. I believe that the consol mode is still it there..

I was thinking it would make a good replacement for the redundant "environment", "annual" and "Runperiod" options- and could be a simple change to have one "Annual" and add an option for "Annual Max" and an option for "Annual Min"..

Annual max and annual min are EPW dependent data, and are already given in the .stat file. Environment, annual and runPeriod has nothing to do with the max single peak value..

Prior to posting this searched documentation for readvarseso, read every page of documentation (1832 to 1834 input output manual and pages 34 to 36 of "tips and tricks" and page 206 of "axillary programs") I do not see any documentation as to how one would attain the information from readvarseso that is not contained in the Input Data Dictionary. If there is a way to use .RVI files, or to set the IDF to report the maximal value, or to use get the maximum data out of the .ESO files that would be great.
The csvproc program runs statistics on hourly values, where I am looking to use .RVI file for annual values so this does not appear to be of any use.

I spent three days on this before I posted, and I have read all documentation I could think of, but will go-ahead and look some more considering you are saying that this is possible and documented. (any advise where to look?)

The ReadVarsESO.exe file is in the PostProcessor folder. There is also a batch file example there.

There is a number of exercise for you to do in the AdvancedOutput folder of the exampleFiles folder. The instructin is in ExerciseOutput1 Instructions.pdf.

After you have used the .rvi file to select the required variable to the .csv file, click on the cloumn and ask the spread sheet to show the max and min value. It will be a waste of resources to create these two values as separate variables..

This is not the first time that "how to use .rvi file" was asked in the forum. The variable names in the .rvi file are those in the header of the .eso file. If the variable is not in the Outpupt variable list, it will not be there. If the variable name is not in the .rdd file, it will not be generated during simulation. This is why you cannot generate your own name with a "max" in it..

Jeremiah D. Crossett | Senior Analyst | Phase Change Energy Solutions

120 E. Pritchard St. | Asheboro, NC 27203 | Mobile 503-688-8951

www.phasechange.com

On Mon, Sep 17, 2012 at 3:49 PM, Linda Lawrie <linda@xxxxxxxxxxxxxx> wrote:

At 04:25 PM 9/17/2012, Jeremiah Crossett wrote:

The need for an object that can output the annual min/max loads to a simple single number that can be compared with other design iterations is common and should be considered for inclusion in Energy Plus V7.2.

Will not happen for V7.2.

Are you saying that ReadVarsEso PostProsser is capable of producing CSV files with the peak value of sensible cooling rate by some undocumented method?

The ReadVars is a very simple method of reading the .eso file. Brent is saying that the .eso file contains the information you want. (And, it is documented).

Have you looked at the csvproc program? I do not remember if that might help you or not.

Linda

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