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RE: [EnergyPlus_Support] Re: HVACTemplates: - Electric fancoils and 100% OA systems


Do not forget that if you are not using the template to enter and expand, the thermostat and base board heater are not the only object to be entered.
You will need the zone list, node list, zone thermostat, schedules for the thermostat, types of the thermostat, heating set point for the thermostat, zone connection, zone equipment list, zone equipment.  I may have missed out a few. All these are done for you by the template expansion.  They are all in the expIDF.
If you can identify all these and note that they all have the same zone prefix.  Follow the same pattern, then you can enter your own class object without using the template.
I run the temples examples, save these in sections for zone primary loop, zone secondary loop, system primary loop, system secondary, Plat hot water loop, plant ChW loop, chiller, boiler, tower.
Heat pumps, packaged units.
Very soon you will find that the plant and loops need not have the same name.  Only the coil branches are linked.  The coil inlet outlet node prefix need not have the same  zone prefix.  However, the order of the branch list and the branches must be the same.
At this stage you can cut and paste the more advanced classes and objects, not relying on the templates.
If you are only interested in building design improvement, you can use the PurchasedAir to control the zone temperature directly.  ( ZoneHVAC:IdealLoadsAirSystem )  District cooling and district heating will allow you to experiment with water to air systems, without the boiler, chillers.

If you have any more question please ask while I am still around.
 Dr. Li  



To: EnergyPlus_Support@xxxxxxxxxxxxxxx

 I get a much better picture now.
thank you for your time Dr.Li.

JP Beaulieu

--- In <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
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> 5ZoneElectricBaseboard.idf is an old example.
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> If you only have the baseboard electric heater and nothing else, this and the thermostat are the only two components required per zone.
> Air leak can be added by infiltration and ventilation objects.
> The system cannot be removed by setting a template field to zero. They can be turned off by setting the thermostat control schedule to be higher and lower than the max and min of the unconditioned zone temperature.
> PTAC is a window unit or a split unit. When it is turned off, it does not consume any energy. You can turn it off, by setting the availability schedule to always off.. You cannot do it in the template.
> OA to zero, no fresh air. Cooling coil to zero at the chiller, yes. Supply air to zero, you may get a warning.
> Unitary system will give you choices of DX cooling, gas and electric heater without boilers and chillers. These are also known as air to air systems.
> Dr. Li
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> To: <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: jippnojunk@...
> Date: Wed, 20 Apr 2011 16:47:17 +0000
> Subject: [EnergyPlus_Support] Re: HVACTemplates: - Electric fancoils and 100% OA systems
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> Great thanks!
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> And what if a zone has no OA intake and just electric baseboards or commercial fan heaters (instead of fancoils; my mistake)? Like a small old building, a residential house or even a mechanical room zone in a bigger building.
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> Are the following good solutions for using the HVACTemplates :
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> ELECTRIC BASEBOARDS - using a UNITARY system and ZONE object and setting the supply air flow rates, OA flow rate and cooling coil availability all to zero 0.
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> ELECTRIC FANCOIL HEATERS - HVACTemplate:Zone:PTAC with OA flow rate and cooling coil availability all to zero 0.
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> Does that makes sense or I am off track? will those behave and consume energy pretty much the way electric baseboards and fan heaters
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> JP Beaulieu
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> PS:
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> I also considered:
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> HVACTemplate:Zone:Fancoil - quite simple but has no electric heating coil type( I should check if it can be modified in the EXPIDF though.)
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> HVACTemplate:Zone:VAV - far too complex to keep just the baseboard or reheat elements. unitary is probably best.
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> Thank you!
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> --- In <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@> wrote:
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> > Make the OA intake flow rate the same as the Fan flow rate, you have 100% OA system.
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> > How do you feed this to all the zones, is another question.
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> > Templates give you a complete view of the EPlus naming convention in the expIDF, before you have learned how to do it yourself directly using an editor.
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> > Learn from that to see how the nodes are systematically named and connected and sequentially placed, and to add more functions as you learn more.
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> > Templates are grouped to illustrate from a simple air loop, to a complex water system with boiler, chiller, tower, and what you can think off. Do not forget the zone thermostat.
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> > Cooling can be done with DX coil, HP, chilled water with chiller, condenser cooling, cooling tower, etc. They are all there.
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> > Dr. Li
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> > To: <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx
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> > From: jippnojunk@
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> > Date: Tue, 19 Apr 2011 21:48:04 +0000
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> > Subject: [EnergyPlus_Support] HVACTemplates: - Electric fancoils and 100% OA systems
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> > Hi all,
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> > HVACtemplate's are great for simpler modeling...I am just not up to speed with the full length HVAC objects... but it seems impossible to model the simplest systems using the HVACTemplate objects:
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> > Electric baseboards and electric fancoils.
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> > Are we suppose to model simpler systems directly without HVAC:Template's? Then I would have to continue my E+ learning. :-)
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> > ((BTW: can one model some systems of a building with HVACTemplate's and the rest of the systems with the full length objects and class? Maybe run the IDF with the HVACTemplate object first, rename the EXPIDF and continue the input with the other HVAC objects? any reasons why one shouldn't do that?))
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> > also how would one model a 100% outside air system? (100% make up air without recirc) Using a chilled water cooling coil...Only HVACTemplate:system VAV can use chilled water... (Sorry, I just posted another msg about that a few minutes ago... not exactly same topic)
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> > JP Beaulieu,
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