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Re: [EnergyPlus_Support] Purchase Air problem 2
On 29 Jul 2005, at 17:45, wah wrote:
> Dear Mike,
>
> I would like to refer to an example day, 7th Jan.
>
> For LVG zone, the Heating Thermostat is set to 20C (Control Type 1) during hours
> 9-11, 13, 14, 19-23. However, the LVG MAT does not show 20C except for hours 22
> and 23 (19C, 21C, 24C, 34C, 36C, 25C, 23C, 22C). Even the supply air temperature
> (Node2) does not show the purchase air supply air temperature, which was set to
> 40C. For the same day, ADJ zone MAT meets all set point temperature, and the
> supply air temperature also shows the expected value, 50C.
Control Type 1 = Single Heating Setpoint. The zone temperatures are above the
heating setpoint, so there is no need for the system to come on. The Purchased
Air system is not causing the zone to overheat, the combination of internal
loads and environment loads are making the zone warm with no HVAC heating or
cooling.
If you want the system to automatically switch between heating and cooling as
needed, then use Control Type 4 = Dual Setpoint with Deadband at all times.
Mike
>
> The same happens to ADJ zone during cooling period, for example, 2nd July.
> ADJ MAT is 20, 24, 25, 25, 26 for hours 1 -7, though the cooling setpoint is 28.
> The supply air node (NodeB) also did not show the expected value, 13C for those
> hours, although Control Type is 2 and Setpoint shows 28C.
>
> I hope this explains my confusion.
>
> Please advice and thank you!
>
> PuiWah
>
>
>
>
>
>
> こんにちは。
>
> In message "Re: [EnergyPlus_Support] Purchase Air problem 2",
> Michael J. Witte wrote...
> >My results look the same as yours. Whenever the control type is set to zero,
> >the setpoint will not be met, because the thermostat is off. There are times
> >when the zone is warmer than the heating setpoint or cooler than the cooling
> >setpoint, but that does not mean the system is not meeting setpoint. > >If you
> want to maintain the space temperature at all times, then use the DUAL
> >SETPOINT WITH DEADBAND thermostat control type, so that the system can
> >automatically switch between heating and cooling as needed. > >If this still
> does not explain things, please refer to specific times in the >output file in
> which you see a problem. > >Mike > > >On 26 Jul 2005, at 22:52, wah wrote: > >>
> Dear Mike, >> >> Thank you for the advice. >> >> The Heating and Cooling
> Setpoint and Control Type do show up as expected. >> However, the LVG MAT could
> not meet Heating Setpoint but meet Cooling Setpoint, >> while ADJ MAT meets
> both setpoints most of the time. >> >> I used the PurchAir Problem idf with
> JPN_Osaka_IWEC.epw weather file. >> As you mentioned the purchased air is
> meeting the request, I wonder if we are >> getting the same output files.. I
> uploaded my output file: >> PurchaseAirProbSpreadsheet Random check shows LVG
> Purchase Air meets 36% of >> Heating and 100% of Cooling requirement; >>
> ADJ Purchase Air meets 96% if Heating and 66% of Cooling >>
> requirement >> I suppose if everything goes well the Heating and
> Cooling requirement should be >> met at least 80% of the time? >> >> Please
> advice and thank you! >> >> PuiWah >> >> >> こんにちは。 >> >> In message
> "Re: [EnergyPlus_Support] Purchase Air problem", >> Michael J. Witte wrote...
> >> >Add the following report variables to see how the system controls are >>
> operating: > > Zone/Sys Thermostat Heating Setpoint > Zone/Sys Thermostat >>
> Cooling Setpoint > Zone/Sys Thermostat Control Type > >Reviewing the results
> >> shows that the purchased air is meeting these requests. >In the control
> type >> schedules there are several months where the control type >is being
> set to zero >> which means no heating or cooling should operate. > >Mike > >
> >On 25 Jul 2005, >> at 15:31, 黄佩華 wrote: > >> Hello. >> I am using
> Purchase Air but it >> does not work consistently. >> The Zone MAT meet the
> setpoint temperature only >> during some days in the >> heating and cooling
> period. >> Uploaded the file: >> PurchAir Problem >> Could anybody please
> advice whether it is problem with my >> setting? >> Thank you! >> >> PuiWah >>
> >> >> >> >> 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 >>
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> > > >> > >======================================================== >Michael J.
> Witte, >> GARD Analytics, Inc. >EnergyPlus Testing and Support >>
> >EnergyPlus-Support@xxxxxxxx > > > > >The primary EnergyPlus web site is found
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> >> >> >> >> >> >> > > >
> >======================================================== >Michael J. Witte,
> GARD Analytics, Inc. >EnergyPlus Testing and Support
> >EnergyPlus-Support@xxxxxxxx > > > > >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.
> >
> >Yahoo! Groups Links
> >
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> >
> >
> >
> >
> >
> >
>
>
>
>
>
> 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
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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