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Fwd: [EnergyPlus_Support] Re: How does Ideal Loads Air System function?


I was wondering: How does the Ideal Loads Air System function handel Latent loads?



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jason Quinn <jason.e.quinn@...> wrote:
> Actually the Ideal Loads can be set to use heat recovery and economizer but
> only if you specify it; It's definitely my favorite object in E+.
> 1. No unless you specify Ideal Air loads won't use heat recover or
> economizer.
> 2. There is no pump/fans modeled so this question is somewhat meaningless.
> It would be best to think of the system as being pure outdoor air supply
> but since there is no "cost" to recirculate air you can think of any ratio
> you want producing the same answer.
> 3. I think the exhaust node is only used for heat recovery so if your not
> recovering heat it is not needed.
> 4. The ideal air loads system is implemented as a VAV system but it is PFM
> (Pure F...ing Magic). It basically just adds/subtracts heat directly from
> the zone without considering most of the things you would typically model
> in E+ like the HVAC system. So unless you put in a capacity or air
> temperature limit into the idealAirLoads object it will essentially vary
> the input air temperature to meet both airflow required and temperature
> required.
> The standard format is in the input/output manual so I didn't paste it here.
> Jason
> ---------- Forwarded message ----------
> From: Jean marais <jeannieboef@...>
> Date: Wed, Aug 29, 2012 at 3:13 PM
> Subject: [EnergyPlus_Support] Re: How does Ideal Loads Air System function?
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> **
> 1) no economizer, no heat recovery
> 2) mixture...recirculates 100% - the min ODA that you specify in the objects
> 3) I don't think node specifications are required. This is not an Airloop
> as such. Think of it more as a calculation. Your sizing:zone object should
> contain most of the info required for the calculation. The Ideal Air system
> fullfills those requirements.
> I've not used this object except via DesignBuilder, so I'm no expert here.
> Find out the nittty gritty by checking examples in your example folder.
> Then let me know.
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Ladan" <ladan_joon@> wrote:
> >
> > Hello,
> >
> > My name is Ladan and I have recently started working with E+. I
> appreciate if you help me figure out how "Ideal Loads Air System" works.
> > My question is:
> >
> > ? Does the Ideal Load system employ economizer and heat recovery system
> even though they are not specified in the idf file and left blank in the
> inputs?
> >
> > ? Is the airflow supplied from outside (outdoor air) in an ideal loads
> system or is it a mix from outside air and return air from the zone?
> >
> > ? I'd like to know if I should define an exhaust node for my system,
> because only an inlet node is required in the idf file.
> >
> > ? Does the Ideal Loads air system assume a VAV system (variable air
> volume) with constant supply air temperature for loads calculations? or it
> totally ignores the type of system?
> >
> > Thank you very much in advance. Your help is really appreciated.
> >
> > Ladan Ghobad
> >
> -- 
> Jason Quinn
> Lead Engineer
> Sustainable Engineering Ltd.
> 82 Liverpool Street
> Wanganui 4500
> New Zealand
> +64 21 1846 911


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