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[EnergyPlus_Support] Re: Multispeed DX Cooling Coil

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Multispeed DX Cooling Coil
From: "anarui.oliveira" <anarui.oliveira@xxxxxxxxx>
Date: Wed, 18 Jun 2008 16:40:21 -0000
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Thank you!
Took me a while, but now I got it, and it is working.

Not wanting to take too much of your time, but do you have any hints 
on the most usual reasons for the maximum iterarions warning:

** Warning ** SimHVAC: Maximum iterations (20) exceeded for all HVAC 
loops

???

Regards, and thanks again,
Ana.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Lixing Gu <gu@...> wrote:
>
> Ana:
> 
> I think you use IDF editor and Version 2.2. I am using the same 
version. It 
> is better to show you how E+ reads inputs of the 
> UNITARYSYSTEM:MULTISPEEDHEATPUMP:AIRTOAIR object. When the number 
of speed 
> for heating is 2, E+ reads two field values:
> 
> Supply air volumetric flow rate during heating operation, Speed 1
> Supply air volumetric flow rate during heating operation, Speed 2
> 
> Any values below could not be blank. Otherwise, the IDF editor 
should 
> complain. This is what you got. When the number of speed for 
cooling is 2, 
> then E+ reads values of flow rates for cooling, just below the flow 
rates 
> for heating. The main issue is that the IDF editor requires static 
inputs, 
> while E+ requires dynamic inputs based on the number of speeds.
> 
> If you use the IDF editor, you may enter the input values like 
below:
> 
> 2, !- Number of speeds for heating
> 2, !- Number of speeds for cooling
> 2.0833, !- Supply air volumetric flow rate during heating 
operation, Speed 1 
> {m3/s}
> 4.1667, !- Supply air volumetric flow rate during heating 
operation, Speed 2 
> {m3/s}
> 2.0833, !- Supply air volumetric flow rate during heating 
operation, Speed 3 
> {m3/s}
> 4.1667; !- Supply air volumetric flow rate during heating 
operation, Speed 4 
> {m3/s}
> 
> After completing inputs using the IDF editor, please use a text 
editor to 
> verify the inputs as shown above. Please let me know what happens.
> 
> Best regards,
> 
> Lixing Gu
> 
> ----- Original Message ----- 
> From: "anarui.oliveira" <anarui.oliveira@...>
> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Sent: Wednesday, June 18, 2008 4:20 AM
> Subject: [EnergyPlus_Support] Re: Multispeed DX Cooling Coil
> 
> 
> >I followed your suggestion, but E+ returns a severe error, instead 
of
> > the warning:
> >
> > ** Severe  ** IP: IDF line~15835 Error detected in
> > Object=UNITARYSYSTEM:MULTISPEEDHEATPUMP:AIRTOAIR, name=ROOFTOP AHU
> > MULTISPEED HP
> >   **   ~~~   ** Field [Supply air volumetric flow rate during
> > heating operation, Speed 3] is required but was blank
> >
> > I now usually leave the inputs that E+ pre-sets, even if they are 
not
> > required for my model, because this new version of E+ (2.2) seems 
to
> > be quite picky about missing values, even when they are not used 
(it
> > happens with other objects and values). Perhaps the warnings 
didn't
> > show up in your trial because you're using version 2.1?...
> >
> > If the warnings are caused by the unused speeds, is there any 
reason
> > why I shouldn't keep those autosize values and ignore the 
warnings?
> >
> > Although, the truth is that the warnings referred to Speeds 1 and 
2,
> > but I guess it could be some sort of bug?...
> >
> > Thank you for the help,
> > Ana.
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Lixing Gu <gu@> wrote:
> >>
> >> Ana Rui:
> >>
> >> I ran the input file and could not repeat the warnings using the
> >> PRT_BRAGANCA_IWEC.epw weather file specified in the input. 
However
> > I found
> >> some inputs which may cause the warnings.
> >>
> >> The numbers of speeds for heating and cooling are 2 in the
> >> UnitarySystem:MultiSpeedHeatPump:AirToAir object. The next four
> > inputs
> >> should be:
> >> 2.0833, !- Supply air volumetric flow rate during heating
> > operation, Speed 1
> >> {m3/s}
> >> 4.1667, !- Supply air volumetric flow rate during heating
> > operation, Speed 2
> >> {m3/s}
> >> 2.0833, !- Supply air volumetric flow rate during cooling
> > operation, Speed 1
> >> {m3/s}
> >> 4.1667; !- Supply air volumetric flow rate during cooling
> > operation, Speed 2
> >> {m3/s}
> >> There is no need to input values for Speeds 3 and 4.
> >>
> >> Your inputs are:
> >>
> >> 2.0833, !- Supply air volumetric flow rate during heating
> > operation, Speed 1
> >> {m3/s}
> >> 4.1667, !- Supply air volumetric flow rate during heating
> > operation, Speed 2
> >> {m3/s}
> >> autosize, !- Supply air volumetric flow rate during heating
> > operation, Speed
> >> 3 {m3/s}
> >> autosize, !- Supply air volumetric flow rate during heating
> > operation, Speed
> >> 4 {m3/s}
> >> 2.0833, !- Supply air volumetric flow rate during cooling
> > operation, Speed 1
> >> {m3/s}
> >> 4.1667, !- Supply air volumetric flow rate during cooling
> > operation, Speed 2
> >> {m3/s}
> >> autosize, !- Supply air volumetric flow rate during cooling
> > operation, Speed
> >> 3 {m3/s}
> >> autosize; !- Supply air volumetric flow rate during cooling
> > operation, Speed
> >> 4 {m3/s}
> >>
> >> Two additional field inputs of autosize (Supply air volumetric 
flow
> > rate
> >> during heating operation, Speed 3 and 4) are recognized by E+ as
> > cooling
> >> flow rates. Since the inputs are autosize, E+ calculated flow 
rates
> > as
> >> 1.18959 at Speed 1 and 2.37918 at Speed 2. The ratio of flow rate
> > (1.18) to
> >> the rated capacity at 42900 may be out of range.
> >>
> >> By the way, E+ uses the flow rate in the
> >> UnitarySystem:MultiSpeedHeatPump:AirToAir object at each speed. 
The
> > rated
> >> flow rate in the Cooling object is used to calculate flow 
fraction,
> > which is
> >> used to calculate flow fraction modifier.
> >>
> >> Please delete autosize inputs. I expect the warnings may go away.
> > At the
> >> same time, I am going to revise the program to catch unmatched
> > inputs.
> >>
> >> Best regards,
> >>
> >> Lixing Gu
> >>
> >>
> >> ----- Original Message ----- 
> >> From: "anarui.oliveira" <anarui.oliveira@>
> >> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> >> Sent: Tuesday, June 17, 2008 12:33 PM
> >> Subject: [EnergyPlus_Support] Re: Multispeed DX Cooling Coil
> >>
> >>
> >> >I uploaded the file with the name "Loja2_cUnitaryMSHP". Thanks.
> >> >
> >> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Lixing Gu <gu@> 
wrote:
> >> >>
> >> >> Ana Rui:
> >> >>
> >> >> Please upload the input file. I am going to take a look.
> >> >>
> >> >> Thanks.
> >> >>
> >> >> Lixing Gu
> >> >>
> >> >> ----- Original Message ----- 
> >> >> From: "anarui.oliveira" <anarui.oliveira@>
> >> >> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> >> >> Sent: Tuesday, June 17, 2008 11:06 AM
> >> >> Subject: [EnergyPlus_Support] Multispeed DX Cooling Coil
> >> >>
> >> >>
> >> >> > Hi.
> >> >> >
> >> >> > Why would a get the following error message:
> >> >> >
> >> >> > Warning ** COIL:DX:MULTISPEED:COOLING "ROOFTOP AHU DX 
COOLING
> >> > COIL" -
> >> >> > Air volume flow rate per watt of rated total cooling 
capacity
> > is
> >> > out of
> >> >> > range at speed 1
> >> >> >
> >> >> > if
> >> >> > - Rated Total Cooling Capacity at Speed 1 = 42900 W
> >> >> > - Rated volumetric flow at speed 1 = 2.0833 m3/s
> >> >> > i.e.
> >> >> > ratio = 0.000049 (m3/s) / W ???
> >> >> >
> >> >> > Am I missing something?
> >> >> >
> >> >> > Thanks in advance,
> >> >> > Ana Rui.
> >> >> >
> >> >> >
> >> >> >
> >> >> > ------------------------------------
> >> >> >
> >> >> > The primary EnergyPlus web site is found at:
> >> >> > http://www.energyplus.gov
> >> >> >
> >> >> > The group web site is:
> >> >> > http://groups.yahoo.com/group/EnergyPlus_Support/
> >> >> >
> >> >> > Attachments are not allowed -- please post any files to the
> >> > appropriate
> >> >> > folder in the Files area of the Support Web Site.
> >> >> >
> >> >> > EnergyPlus Documentation is searchable.  Open 
EPlusMainMenu.pdf
> >> > under the
> >> >> > Documentation link and press the "search" button.
> >> >> > Yahoo! Groups Links
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >>
> >> >
> >> >
> >> >
> >> > ------------------------------------
> >> >
> >> > The primary EnergyPlus web site is found at:
> >> > http://www.energyplus.gov
> >> >
> >> > The group web site is:
> >> > http://groups.yahoo.com/group/EnergyPlus_Support/
> >> >
> >> > Attachments are not allowed -- please post any files to the
> > appropriate
> >> > folder in the Files area of the Support Web Site.
> >> >
> >> > EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf
> > under the
> >> > Documentation link and press the "search" button.
> >> > Yahoo! Groups Links
> >> >
> >> >
> >> >
> >> >
> >>
> >
> >
> >
> > ------------------------------------
> >
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> >
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
> >
> > Attachments are not allowed -- please post any files to the 
appropriate 
> > folder in the Files area of the Support Web Site.
> >
> > EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf 
under the 
> > Documentation link and press the "search" button.
> > Yahoo! Groups Links
> >
> >
> >
> >
>



------------------------------------

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References:
- Re: [EnergyPlus_Support] Re: Multispeed DX Cooling Coil
  - From: Lixing Gu

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