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[EnergyPlus_Support] Re: Small School - Modelling Simple Heating and Ventilation Equipment



Hi

I changed the modelling solution for this building, to a two air loop
possibility using direct air. I corrected the issues discussed above,
tried a small period simulation (january month), but it resulted in
some severe errors. I looked at the issues suggested in the error
report but I don´t think the problem is related to these suggestions.
Could it be the HVAC system modelling? The errors are as follow:

Program Version,EnergyPlus 2.1.0.023, 11-02-2008 16:13,IDD_Version
2.1.0.023
   ************* Beginning Zone Sizing Calculations
   ** Warning ** Weather file location will be used rather than
entered Location object.
   **   ~~~   ** ..Location object=FAMALICAO
   **   ~~~   ** ..Weather File Location=PORTO - PRT IWEC DATA WMO#=085450
   ** Warning ** Calculated design cooling load for zone=EDÍFICIO -
SALA AULA 3 is zero.
   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC inputs.
   ** Warning ** Calculated design cooling load for zone=EDÍFICIO -
SALA EDUCADOR is zero.
   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC inputs.
   ** Warning ** Calculated design cooling load for zone=EDÍFICIO -
SALA AULA 2 is zero.
   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC inputs.
   ** Warning ** Calculated design cooling load for zone=EDÍFICIO -
SALA AULA 1 is zero.
   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC inputs.
   ************* Beginning System Sizing Calculations
   ** Warning ** Calculated cooling design air flow rate for
system=AIR LOOP2 is zero.
   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC inputs.
   ** Warning ** Calculated cooling design air flow rate for
system=AIR LOOP1 is zero.
   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC inputs.
   ************* Beginning Plant Sizing Calculations
   ************* Testing Individual Branch Integrity
   ************* All Branches passed integrity testing
   ************* Testing Individual Supply Air Path Integrity
   ************* All Supply Air Paths passed integrity testing
   ************* Testing Individual Return Air Path Integrity
   ************* All Return Air Paths passed integrity testing
   ************* No node connection errors were found.
   ** Warning ** Inside surface heat balance did not converge with Max
Temp Difference [C] =2.493E-003 vs Max Allowed Temp Diff [C] =2.000E-003
   **   ~~~   **  Occurrence info=PORTO - PRT IWEC DATA WMO#=085450,
01/03 14:30 - 14:31
   ** Warning ** Inside surface heat balance did not converge with Max
Temp Difference [C] =9.556E-003 vs Max Allowed Temp Diff [C] =2.000E-003
   **   ~~~   **  Occurrence info=PORTO - PRT IWEC DATA WMO#=085450,
01/03 14:45 - 14:46
   ** Warning ** Inside surface heat balance did not converge with Max
Temp Difference [C] =9.928E-002 vs Max Allowed Temp Diff [C] =2.000E-003
   **   ~~~   **  Occurrence info=PORTO - PRT IWEC DATA WMO#=085450,
01/03 15:00 - 15:01
   ** Warning ** Inside surface heat balance did not converge with Max
Temp Difference [C] =0.824 vs Max Allowed Temp Diff [C] =2.000E-003
   **   ~~~   **  Occurrence info=PORTO - PRT IWEC DATA WMO#=085450,
01/03 15:15 - 15:16
   ** Warning ** Inside surface heat balance did not converge with Max
Temp Difference [C] =246.544 vs Max Allowed Temp Diff [C] =2.000E-003
   **   ~~~   **  Occurrence info=PORTO - PRT IWEC DATA WMO#=085450,
01/03 15:30 - 15:31
   ** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
   **   ~~~   **  CorrectZoneHumRat Occurrence info=PORTO - PRT IWEC
DATA WMO#=085450, 01/03 15:16 - 15:17
   **   ~~~   **  Input Temperature=200.06
   ** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
   **   ~~~   **  CorrectZoneAirTemp Occurrence info=PORTO - PRT IWEC
DATA WMO#=085450, 01/03 15:16 - 15:17
   **   ~~~   **  Input Temperature=200.06
   ** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
   **   ~~~   **  CorrectZoneHumRat Occurrence info=PORTO - PRT IWEC
DATA WMO#=085450, 01/03 15:17 - 15:18
   **   ~~~   **  Input Temperature=200.34
   ** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
   **   ~~~   **  CorrectZoneAirTemp Occurrence info=PORTO - PRT IWEC
DATA WMO#=085450, 01/03 15:17 - 15:18
   **   ~~~   **  Input Temperature=200.34
   ** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
   **   ~~~   **  CorrectZoneHumRat Occurrence info=PORTO - PRT IWEC
DATA WMO#=085450, 01/03 15:17 - 15:18
   **   ~~~   **  Input Temperature=200.27
   ** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
   **   ~~~   **  CorrectZoneAirTemp Occurrence info=PORTO - PRT IWEC
DATA WMO#=085450, 01/03 15:17 - 15:18
   **   ~~~   **  Input Temperature=200.27
   ** Warning ** Inside surface heat balance did not converge with Max
Temp Difference [C] =264.266 vs Max Allowed Temp Diff [C] =2.000E-003
   **   ~~~   **  Occurrence info=PORTO - PRT IWEC DATA WMO#=085450,
01/03 15:45 - 15:46
   ** Severe  ** Temperature out of bounds (-102.22) for surface=R_
EDÍFICIO - SALA AULA 3_1_0_0
   **   ~~~   ** in Zone=EDÍFICIO - SALA AULA 3
   **   ~~~   **  Occurrence info=PORTO - PRT IWEC DATA WMO#=085450,
01/03 16:00 - 16:01
   **   ~~~   ** A temperature out of bounds problem can be caused by
several things.  The user
   **   ~~~   ** should check the weather environment, the level of
internal gains with respect
   **   ~~~   ** to the zone, and the thermal properties of their
materials among other things.
   **   ~~~   ** A common cause is a building with no thermal mass --
all materials with
   **   ~~~   ** Regular-R definitions.
   **  Fatal  ** EnergyPlus has exited due to the reason stated above
   ...Summary of Errors that led to program termination:
   ..... Reference severe error count=1
   ..... Last severe error=Temperature out of bounds (-102.22) for
surface=R_ EDÍFICIO - SALA AULA 3_1_0_0
   ************* EnergyPlus Terminated--Fatal Error Detected. 19
Warning; 1 Severe Errors; Elapsed Time=00hr 00min  7.17sec

I´m uploanding the file so that you can have a look at it.

Thanks for the help
Nuno Brandão




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