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Re: [EnergyPlus_Support] Purchase Air problem 2

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Purchase Air problem 2
From: wah <wong@xxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 05 Aug 2005 18:12:14 +0900
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Dear Mike,

Thank you for the explanation!

Wah

こんにちは。

In message "Re: [EnergyPlus_Support] Purchase Air problem 2",
Michael J. Witte wrote...
 >
 >
 >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 >> 
 >>  allowed -- please post any files to the appropriate folder >> in the Files area
 >>  >>  of the Support Web Site. >> >> Yahoo! Groups Links >> >> >> >> >> >> >> >>
 >>  > > >>  > >======================================================== >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 >> 
 >>  >  Visit your group "EnergyPlus_Support" on the web. >>  >   To unsubscribe
 >>  from this group, send an email to: >>  >
 >>  EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx >>  >   Your use of Yahoo!
 >>  Groups is subject to the Yahoo! Terms of Service. >>  > >> >> >> >> >> 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 >> >>
 >>  >> >> >> >> >> >> > > >
 >>  >======================================================== >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
 >>  >
 >>  >
 >>  >
 >>  > 
 >>  >
 >>  >
 >>  >
 >>  >
 >> 
 >> 
 >> 
 >> 
 >> 
 >> 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
 >> 
 >> 
 >> 
 >> 
 >> 
 >> 
 >> 
 >> 
 >
 >
 >
 >========================================================
 >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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References:
- Re: [EnergyPlus_Support] Purchase Air problem 2
  - From: Michael J. Witte

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