Re: [EnergyPlus_Support] an idf model question

[Feilix Tom <leebye2008@xxxxxxxxx>]

Dr.Li
Let me take a few days to think about it. I can download documents except that 037 interim version. :-(
I don't know why. Is there any other place I can download it?
Feilix
From: YuanLu Li <yli006@xxxxxxxxxxx>
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Monday, September 5, 2011 8:32 PM
Subject: RE: [EnergyPlus_Support] an idf model question


Hi, Felix

The error file of the other version is attached.

I do not know know whether the vers6.0.0.023 is the problem.  The update to Ver6.0.0.037 is available on the Support website.  It was issued quite some time ago..

The second file has the error at the air loop.  The earlier one the error was on the CW loop.

What I asked you to send me was the original template IDF (unexpended).

You have removed a number of objects from the files.

There was no report variables on the zone temprature, etc.  How do you know that the program is working.

There will be no monthly report, because you did not have a full annual simulation.

"There is a design cooling load according to the output. It means that the internal load and building surface are resonable."  This probably is the sizing output, and not the simulation output.

=================
...Summary of Errors that led to program termination:

..... Reference severe error count=1

..... Last severe error=GetAirPathData: AirLoopHVAC="1FCC", invalid actuator.

************* Warning: Node connection errors not checked - most system input has not been read (see previous warning).

************* Fatal error -- final processing. Program exited before simulations began. See previous error messages.

************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.

************* EnergyPlus Sizing Error Summary. During Sizing: 2 Warning; 1 Severe Errors.

************* EnergyPlus Terminated--Fatal Error Detected. 2 Warning; 1 Severe Errors; Elapsed Time=00hr 00min 3.43sec
=======================

There may be more errors, when the simulation starts.

Do not try to change the empIDF and use it as IDF, if you do not know what you are changing.

An imcomplete one zone simulation is more difficult to debug, because the zone equipemt and common system and the use of thermostat are all not clearly specified.

Why do you use a water system for a one room building?  Because one zone building only have one branch, you may have removed the splitter and mixer as well.  I have not check that yet, because the IDF has been sorted, which made it more difficult to find all the branchesof the same class.

When you have an actuator in the OA mixer, you need a controller.

If you control zone CW coil by thermostat, you do not need a controller.  If you use a set point to control a system CW coil, you need a controller.  These are all done by the template object by selecting the fields correctly.

 Dr. Li  


To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: leebye2008@xxxxxxxxx
Date: Sun, 4 Sep 2011 22:57:03 -0700
Subject: Re: [EnergyPlus_Support] an idf model question


Dr.Li,
It's Strange.
Plz try the two idf attached. One with controller and the other without.
They are both working well on my computer, whether there is a controller or not, as you have informed me. I tried the idf with and without the controller. My ep version is 6.0.0.023, is it the problem?

It's working well except the cooling consumption is always zero while it does has an autosized design load.
There is a design cooling load according to the output. It means that the internal load and building surface are resonable.
But the monthly cooling consumption is always 0 according to the output file. It should have cooling consumption at least in the month which design day exists. What kind of errors could give such output?
This is what confused me the most, I can't find anything wrong with the input within my knowledge.

You are definitely good at e+, but I am not. I have read many examples in the spread sheet and tried the examples in the gettingstarted book.  I can understand some basic rules but not all of them. So I am trying to master it by simulate my previous project that are not simulated by e+.  By this stage, I could establish a building zone, plant loops efficiently. That a great progress I think. But the air side is still a problem sometimes.

Indulge me that I am using such an example, but this is the best way you can help me the best, I think.
 Thank you very much.
Leebye

From: YuanLu Li <yli006@xxxxxxxxxxx>
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Saturday, September 3, 2011 1:13 AM
Subject: RE: [EnergyPlus_Support] an idf model question


Hi Felix

I am not sure what you are going to do.

If you are are trying to learn how to write an good EPlus IDF, open one 3Zone or 5Zone example oand see how the objects are arranged.

Choosing a one zone problem does not make it easier to learn EPlus.  You do not know what is a zone equipent and what is a system equipment.  Why do you need a system and cooling plant plant?  Yes, the room is large.  That was why asked you last time is such a building arrangement pracital?

If you have a large room and with good insulation and no internal load, you would need any cooling.

However, the simulation error was due to you formet of IDF was not complete.  A controller list is required with your water coil controller object.

If you only have a single zone  fan coil unit there is not controller required.  The fan coil is controlled directly by the thermostat.   Cooling alone does not reduce the controlling requirement.

I suggest that you run the examples in the Getting Started document and read the instructions on how to use the templates and controls.

Do not copy some unknown examples and try to make it work.  If you are using the template, stay with the template and make changes in the template IDF.