CONTINUOUS_MODEL CeFan

ABSTRACT
"FAN w On/Off control (low flow when off). Efficiency & temp rise given.


Date:      March 27, 1997



Made by:   Mika Vuolle

           

Call:      RHODRY from Psychro2.nmf

AB 971203  Changed default for dpMin

PS 970918  added parameter dpMin and altered corresponding assignment for dp
           removed if-then-else stucture around Trise

MV 971125  FlowLS local variable is added to presentation purpose

"





EQUATIONS



  dp:= dpMax*FanOn + dpMin*(1 - FanOn);



  PAirOut = PAirIn + dp;



  TAirOut = TAirIn +  TRise;



  VolFlow := MAir / RHODRY(TAirIn,WAir) * 1000;

  QSup := MAir / RHODRY (TAirIn,WAir) * dp / eta ;



LINKS

/* type        name           variables ....  */



  ControlLink  FanControl     FanOn;



  UniAir       FanIn          PAirIn,  POS_IN  MAir, TAirIn,  XAir, WAir;

  UniAir       FanOut         PAirOut, POS_OUT MAir, TAirOut, XAir, WAir;



VARIABLES

/* type      name           role   def          min      max   description*/



  Control     FanOn          IN       1            0        1   " 0 = Fan Off

                                                                 1 = Fan On"



  Pressure    PAirIn         IN    1325         -BIG      BIG   "Pressure of entering air"

  Pressure    PAirOut        OUT   1425         -BIG      BIG   "Pressure of leaving air"

  Pressure    dP             LOC    100            0      BIG   "Pressure rise in fan"



  MassFlow    MAir           IN       3.2          0      BIG   "Dry air massflow rate"



  Temp        TAirIn         IN      18     ABS_ZERO      BIG   "Temp of entering air"

  Temp        TAirOut        OUT     20     ABS_ZERO      BIG   "Temp of leaving air"



  HumRatio    WAir           IN       0.01         0      1     "Humidity ratio of entering air"



  Fraction_y  XAir           IN     594            0      BIG   "Pollutant fraction"



  ElPowerCons QSup           LOC    296            0      BIG   "Power supply of fan"

  VolFlow_m   VolFLow        LOC   2666            0      BIG   "Air flow in l/s"


PARAMETERS

/* type      name           role  def           min      max   description */



  Pressure   dpMax          S_P    500        SMALL      BIG   "Pressure head at FanOn = 1"
  Pressure   dpMin          S_P    0.1        SMALL      BIG   "Pressure head at FanOn <= 0 (for numerical reasons)"

/*Temp       TRise          S_P      2            0      BIG   "Temp rise in fan" */
  Temp       TRise          S_P      1            0      BIG   "Temp rise in fan"

  Factor     eta            S_P      0.9      SMALL         1  "Fan efficiency"



END_MODEL