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[EnergyPlus_Support] Design days doubt




   I was looking some design days and have some doubts about it. I copy 4
design days conditions below, and first of all, why, on the second design day
below, for heating 99%, the wind speed and direction are taken from the Cooling
0,4% (ASHRAE HANDBOOKS FUNDAMENTALS 2001, p. 27.28)? And why in the cooling
design days the wind speed and direction are zero? It's because in summer we
have to consider that the hottiest day is that one without wind?


! ARCH_DE_FERNANDO_BRA Heating 99.6%, MaxDB=  22.90 Wind Speed=   3.10 Wind
Dir= 130.00
 DesignDay,
     ARCH_DE_FERNANDO_BRA Heating 99.6% Conditions,     !- Name
   22.90000     ,     !- Max Dry-Bulb {C}
  0.0000000E+00 ,     !- Daily Temp Range {C}
   22.90000     ,     !- Wet-Bulb at Max {C}
   100654.1     ,     !- Barometric Pressure {N/M**2}
   3.100000     ,     !- Wind Speed {M/Sec}
   130.0000     ,     !- Wind Direction {Degrees N=0, S=180}
  0.0000000E+00 ,     !- Clearness {0.0 to 1.1}
           0 ,     !- Rain {0-no,1-yes}
           0 ,     !- Snow on ground {0-no,1-yes}
          21 ,     !- Day of Month
           7 ,     !- Month
   WinterDesignDay,      !- Day Type
           0 ;   !- Daylight Savings Time Indicator

 ! ARCH_DE_FERNANDO_BRA Heating 99%, MaxDB=  23.30 Wind Speed=   4.60 Wind Dir=
150.00
 DesignDay,
     ARCH_DE_FERNANDO_BRA Heating 99% Conditions,     !- Name
   23.30000     ,     !- Max Dry-Bulb {C}
  0.0000000E+00 ,     !- Daily Temp Range {C}
   23.30000     ,     !- Wet-Bulb at Max {C}
   100654.1     ,     !- Barometric Pressure {N/M**2}
   4.600000     ,     !- Wind Speed {M/Sec}
   150.0000     ,     !- Wind Direction {Degrees N=0, S=180}
  0.0000000E+00 ,     !- Clearness {0.0 to 1.1}
           0 ,     !- Rain {0-no,1-yes}
           0 ,     !- Snow on ground {0-no,1-yes}
          21 ,     !- Day of Month
           7 ,     !- Month
   WinterDesignDay,      !- Day Type
           0 ;   !- Daylight Savings Time Indicator

 ! ARCH_DE_FERNANDO_BRA Cooling (DB=>MWB) .4%, MaxDB=  31.00 MWB=  25.60
 DesignDay,
     ARCH_DE_FERNANDO_BRA Cooling .4% Conditions DB=>MWB,     !- Name
   31.00000     ,     !- Max Dry-Bulb {C}
   4.500000     ,     !- Daily Temp Range {C}
   25.60000     ,     !- Wet-Bulb at Max {C}
   100654.1     ,     !- Barometric Pressure {N/M**2}
  0.0000000E+00 ,     !- Wind Speed {M/Sec}
  0.0000000E+00 ,     !- Wind Direction {Degrees N=0, S=180}
   1.000000     ,     !- Clearness {0.0 to 1.1}
           0 ,     !- Rain {0-no,1-yes}
           0 ,     !- Snow on ground {0-no,1-yes}
          21 ,     !- Day of Month
           1 ,     !- Month
   SummerDesignDay,      !- Day Type
           0 ;   !- Daylight Savings Time Indicator

 ! ARCH_DE_FERNANDO_BRA Cooling (DB=>MWB) 1%, MaxDB=  30.30 MWB=  25.30
 DesignDay,
     ARCH_DE_FERNANDO_BRA Cooling 1% Conditions DB=>MWB,     !- Name
   30.30000     ,     !- Max Dry-Bulb {C}
   4.500000     ,     !- Daily Temp Range {C}
   25.30000     ,     !- Wet-Bulb at Max {C}
   100654.1     ,     !- Barometric Pressure {N/M**2}
  0.0000000E+00 ,     !- Wind Speed {M/Sec}
  0.0000000E+00 ,     !- Wind Direction {Degrees N=0, S=180}
   1.000000     ,     !- Clearness {0.0 to 1.1}
           0 ,     !- Rain {0-no,1-yes}
           0 ,     !- Snow on ground {0-no,1-yes}
          21 ,     !- Day of Month
           1 ,     !- Month
   SummerDesignDay,      !- Day Type
           0 ;   !- Daylight Savings Time Indicator

=====
________________________________________________________
 Engº Fábyo Luiz Pereira
 UFRGS - Laboratório de Vapor e Refrigeração
 Rua Sarmento Leite, 425 - Sala 203 - Centro - 90050-170
 Fone / Fax: +55 51 3316-3167 / 3316-3355
 www.mecanica.ufrgs.br/lafrig
 Porto Alegre - RS - BRASIL


	
	
		
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