RE: [EnergyPlus_Support] (unknown) and splitter/mixer

[YuanLu 元六 Li <yli006@xxxxxxxxxxx>]

This the reason why I have post a few messages in the last few days on this subject.
 
Any of you who need help have to be more specific on what you wanted to do, and how much you can do yourself.  Sending me your IDF is the best way to show me the problem area.
 
I am a retired Engineering Professor and have time to help some of you, if your probjem is not too completed, as I am also learning myself.
-------------------------------
 
First, do you have a building?  If you do not, select one from the 1zone examples in he examples folder.
 
1ZoneUncontrolled_DDChanges.idf has a problem, because the floor and the roof entries are missing.  It is too advance for a beginer.
 
(Linda, you may wante to have a look at this.  After I copied the roof and floor and their construction and material info from the other IDF into this, it completed the simulation.  Should the floor be facing ground and not to itself?)
 
1ZoneEvapCooler.idf is simple in zone number, but the concept is a bit advanced, because it used an available schedule to control a object which is not normally controlled.  If you can master this one, you can do more.  The room use outside air for ventelation and the evapolation cooling for cooling, when the outdoor temperature is higher.  Some one had copy this example for schedules and got into trouble, because the way of using the schedule is for a special arrangement.
 
1ZoneUncontrolled.idf  provide you with a building of one zone and no equipment.  Running this example will show you how the temperature will change in the building through the year, with no HVAC.  You can use this as your building to test any of the equipment you would like to add.  The schedule may be confusing to some beginers, because the long format are given together with the combact schedule.
 
1ZoneUncontrolled_win_1.idf has a window, and you can study the effect sun radiation in the room temperature. (TRansmittance of window)
 
This is probable the best one to use as a starting building structure, for adding equipment.
 
Send me or post your IDF, if after adding your equipment and the simulation failed.  Do not be afraid to make mistake.  Without making any mistake, you will not know how the computer can communicate with you with the error messages.

 Dr. Li  

 

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To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: gounphysic@xxxxxxxx
Date: Wed, 24 Jun 2009 17:10:04 +0000
Subject: RE: [EnergyPlus_Support] (unknown) and splitter/mixer

The examle file
Zone HAVAC:Baseboard Convective Water

is very complex example for someone bigginer i really dont know if i have to use all of these components or which one i should delete for a simple heating simulation.

please i need more help!

 

--- ΣÏ?ιÏ? ΤÏ?ίÏ?., 23/06/09, ο/η YuanLu å??å?­ Li <yli006@hotmail.com> έγÏ?αÏ?ε:

Î?Ï?Ï?: YuanLu å??å?­ Li <yli006@hotmail.com>
Î?έμα: RE: [EnergyPlus_Support] (unknown) and splitter/mixer
ΠÏ?οÏ?: "Linda" <energyplus_support@yahoogroups.com>
Î?μεÏ?ομηνία: ΤÏ?ίÏ?η, 23 Î?οÏ?νιοÏ? 2009, 1:57

Zone HAVAC:Baseboard Convective Water is the object to use.

 

However, 5ZoneWaterCooled _Baseboard idf   is not an easy example to follow.
 
In this example IDF, the water baseboard heater is used as an auxiliary zone equippment.
 
I have not look at all the schedules, etc.  in detail.  It appears to me that the baseboard heater will be used when the main air system is not sufficient or turned off. 

If you know how to extract the requred objects for the baseboard heater from this IDF, you can form a much simpler IDF, with just the boiler and the pump and the baseboard heater.  There is also a chiller in this example.
 
You may send me the extracted IDF and your building envelop, if you cannot get the reduced  IDF to work. 
 
By the way, you do not have to delete all the unwanted components, and change the building envelope.  Simply change the settings of the available schedules for the different zones and leave the one you want to operate.  The chiller and the air terminals will all be turned off.  This appears to be difficult, but is a process you should try, to understand  how the schedule are working and interacting.
------------ --------- --------- ----
The second question, I am not sure whether you have mixed up the zones with rooms.
 
One Energy Pluse zone may have many rooms.  However, you may only have one thermostat control per zone.

If you want two rooms, each with a thermostat, you cannot combined them into one zone, and you must have a air terminal in the zone which can be controlled by the thermostat. 
 
You may have one air handler unit (AHU) feeding two zones (each zone with many rooms), one master zone with thermostat is temperature controlled. The other, slaved zone, receives a fixed proportion of air through a spliter and an air terminal with no control. (a fixed damper) If the two zones have  load demands that are not varying with time, the arrangment is usally very acceptable. 
 
Many small/medium  size offices are arranged this way with one  or two AHU's per floor.  The occupant will adjust the air diffuser damper slightly to suit their indevidual requiement in a common office area.  Manager's room may have a thermostat controlled air diffuser, which may the room slightly warmer or cooler than the general area.
 
If the two rooms (zones) are not of the same size, you can set the damper to a different ratio,  0.5:0.5,(equal)   0.3:0.7, (small, large) etc.  The total amount of air flow is that available from the AHU.  The return air will be through a mixer or the plenum, which is not controlled.
 
The last paragraph may  also answered the question posed by another member of this group on how to feed two zones from one AHU using one duct.
 

 Dr. Li  

 

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To: EnergyPlus_Support@ yahoogroups. com
From: dashamirmarini@ yahoo.com
Date: Mon, 22 Jun 2009 01:46:26 -0700
Subject: Re: [EnergyPlus_ Support] (unknown)

hi

one simple example file which use also Zone HAVAC:Baseboard Convective Water as zone equipment to heat space is:5ZoneWaterCooled _Baseboard idf file.
second question I'm not clear what you mean.

good luck

Dashamir

--- On Sat, 6/20/09, Î?νδÏ?έαÏ? ΧÏ?ιÏ?Ï?οÏ?Ï?Ï?οÏ? <christoforouan@ yahoo.gr> wrote:

From: Î?νδÏ?έαÏ? ΧÏ?ιÏ?Ï?οÏ?Ï?Ï?οÏ? <christoforouan@ yahoo.gr>
Subject: [EnergyPlus_ Support] (unknown)
To: EnergyPlus_Support@ yahoogroups. com
Date: Saturday, June 20, 2009, 4:07 AM

Hello

 

I am writing to you because i have two questions

I am looking for the simplest example file in the energy plus that has space heating radiator (Zone HAVAC:Baseboard Convective Water) combined with a boiler. Or something similar to that, because I want to use the energy plus for space heating simulation.

Besides I would like to know if we can combine 2 energy zones to one, and how.

 

Thanks for

 your time and consideration

 Best Regards

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