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[EnergyPlus_Support] Re: Multiple HVACTemplates Per Zone Error

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Multiple HVACTemplates Per Zone Error
From: "ntraughpee" <matthew.sverre.anderson@xxxxxxxxx>
Date: Thu, 09 Aug 2012 21:16:10 -0000
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Hey Dr. Li,

I really appreciate your help, I finally figured out  my mistake. I am fairly familiar with the E+ coding, although I prefer the IDFeditor, but I realized what I was doing. I had no experience with the DOAS and didn't realize it would solve my problem by putting it into the HVACTemplate.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
>
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> "So you are saying use the HVACTemplate:System:VAV and input it into the HVACTemplate:Zone:Unitary?"
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> These two templates are expanded into two different sets of objects.  One for AHU, and the other for the ATU in the zone.  They will be listed separately in the .expIDF. You need to enter two sets, one for each AHU group, (or one per floor) and a third set for the basement. I cannot say more about the options, because I do not know how your system is controlled.       "The issue right now is that the zones are controlled by two separate systems. The fan coils are controlled by an old pneumatic Honey Well system whereas one constant volume air handler feeds the basement and two multizone air handlers control the first and second floor. All the controlled by modern electronic controls. We have room thermostats for each of the fan coils but a few temperature sensors for the air handlers."  More detailed information is required to define the controller. Do you wish to change over the cooling and heating in an on demand basis or in a seasonal basis? Why do you have the AHU and the fan coil unit in each zone?  What is the temperature of the supply air from the AHU, and how is this temperature determined? Because you are not familiar with the EPlus coding, it will be very difficult to change objects directly in the .expIDF, without the original template running successfully.  Dr. Li   
>  To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: matthew.sverre.anderson@...
> Date: Wed, 8 Aug 2012 20:40:25 +0000
> Subject: [EnergyPlus_Support] Re: Multiple HVACTemplates Per Zone Error
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>       Dr. Li,
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> So you are saying use the HVACTemplate:System:VAV and input it into the HVACTemplate:Zone:Unitary?
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> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@> wrote:
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> > I summarized my comments with the diagram attached.
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> > The template version should be working first, before starting to modify the .expIDF.
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> > I think, all the features are in the templat options.
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> >  Dr. Li   
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> > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
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> > From: matthew.sverre.anderson@
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> > Date: Wed, 8 Aug 2012 14:51:55 +0000
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> > Subject: [EnergyPlus_Support] Re: Multiple HVACTemplates Per Zone Error
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> >       
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> >       The issue right now is that the zones are controlled by two separate systems. The fancoils are controlled by an old pneumatic Honey Well system whereas one constant volume air handler feeds the basement and two multizone air handlers control the first and second floor. All the controlled by modern electronic controls. We have room thermostats for each of the fan coils but a few temperature sensors for the air handlers.
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> > What I wanted to originally was to use the HVAC Template to "lay out" the nodes and then work thru the expidf to more accurately represent the system as it operates. I am tentatively planning on not modeling the switch over losses and just subtracting the energy loss from our metered energy consumption for baseline energy consumption. 
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> > Anyway, in attempting to set up the HVACTemplate:System for the air handlers and the HVACTemplate:Zone for the fancoils and the VAV (just to get the nodes set up properly) with extra thermostats. I got the error that says "ZONE NAME". Names must be unique across all HVACTemplate:Zone: objects. Because of this I am assuming that I can't use the HVACTemplate to "set up the nodes" and then swap out objects keeping the nodes there.
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> > What I then did was I made an HVACTemplate for the VAV feeding the zones with thermostats. I then took the expidf and put in two AirTerminal:DualDuct:Constant Volume for the MZ air handlers then replaced  AirTerminal:SingleDuct:VAV:NoReheat but I put in a constant volume fan and set the min/max airflow to being the same. Would the AirTerminal:SingleDuct:Uncontrolled be a good replacement for this? Would I then remove the zone equipment if I did that?
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> > I then took the HVACTemplate:Zone:Fancoil expidf and began copying and pasting the relevant objects from that expidf to the Air Handler idf and adjusted the branches. I haven't gotten it working yet but I am looking for guidance on if this makes sense and whether or not I can get two HVACTemplate:Zone... to the same zone using the HVACTemplate objects instead of the longer way.
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> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@> wrote:
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> > > So I have a system that has central handlers feeding 5 zones, 1 basement, 2 north/south for the 1st and 2nd floor. It then has a room fancoil system that heat/cools the same zones. The fancoil system is two pipe with a switch over where we can only heat or cool at any given time.
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> > > I would like to get to the point where I can correctly model the amount of energy we are wasting in switch overs, I have done this in excel already but I would like to figure this out in E+.
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> > > In trying to put both a fan coil and a VAV air handler into a zone I received an error regarding the DSOA systems where it is trying to tell me I can't have more than one HVAC Template per system. Is this true?
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> > > Any work arounds here?
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References:
- RE: [EnergyPlus_Support] Re: Multiple HVACTemplates Per Zone Error
  - From: YuanLu Li

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