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Heat Pump with CO2 as Refrigerant

Heat Pump with CO2 as Refrigerant

Heat Pump with CO2 as Refrigerant

(OP)
Hi,

I'm a new Aspen plus user and I would like simulate a Heat pump process with CO2 as Refrigerant. After I give all the specification and all blocks are with a blue color(completely specified).

My simulation get not started, I get always this Error:
Processing input specifications ...

      INFORMATION
      BINARY PARAMETERS PRKIJ (DATA SET 1) FOR MODEL ESPRSTD
      ARE RETRIEVED FROM SDF TABLE.  TABLE NAME = ESPRSTD

  *   WARNING
      THERE ARE NO INLET STREAMS TO THE FLOWSHEET.
      FLOWSHEET CONVERGENCE PROBLEMS MAY RESULT.

  *   WARNING
      THERE ARE NO OUTLET STREAMS FROM THE FLOWSHEET.
      FLOWSHEET CONVERGENCE PROBLEMS MAY RESULT.

  Flowsheet Analysis :

 Block $OLVER01 (Method: WEGSTEIN) has been defined to converge
         streams: 1

 COMPUTATION ORDER FOR THE FLOWSHEET:
 $OLVER01 B2 B3 B4 B5
 (RETURN $OLVER01)

->Calculations begin ...


> Beginning Convergence Loop $OLVER01 Method: WEGSTEIN

   Block: B2       Model: HEATER
  *   WARNING
      ZERO FEED TO THE BLOCK.  BLOCK BYPASSED


   Block: B3       Model: VALVE
  *   WARNING
      ZERO FEED TO THE BLOCK. BLOCK BYPASSED


   Block: B4       Model: HEATER
  *   WARNING
      ZERO FEED TO THE BLOCK.  BLOCK BYPASSED


   Block: B5       Model: COMPR
  *   WARNING
      TOTAL FLOW IS ZERO. INLET STERAM IS COPIED TO OUTLET.

      SKIPPING REST OF THE BLOCK CALCULATIONS DUE TO INPUT ERRORS.

> Loop $OLVER01 Method: WEGSTEIN     Iteration    1
# Converged              Max Err/Tol   0.00000E+00

->Generating block results ...

    Block: B4       Model: HEATER
  *** SEVERE ERROR
      FORTRAN INVALID OPERATION ENCOUNTERED.


    Block: B2       Model: HEATER
  *** SEVERE ERROR
      FORTRAN INVALID OPERATION ENCOUNTERED.




the Blocks are:
B2 : a Heater( it has the function of a Gas cooler) specification: Pressure:100bar
                vapor Fraction:1

B3: a Valve. specification: outlet Pressure: 100bar

B4: a Heater again (it has the function of a evaporator) specification: Pressure: 30 bar Heat duty: 100 kw

B5: Compressor, isentropic. specification: Discharge Pressure :100 bar.


can u help me please!!

thanks in advance.

RE: Heat Pump with CO2 as Refrigerant

it seems that you didnt define an inlet stream, as such there is no flow going through your process.

you need to have a stream get in the first block with the definition of the stream composition and process condition.

Hope it helps

RE: Heat Pump with CO2 as Refrigerant

(OP)
thx jcazenave for ur Answer.
well now it's everything ok and the calculation were completed normally.
but i still have the problem with the plot wizard, so wenn i click on plot , then click plot wizard and after selecting a plot type then the next button, i usually get the answer "results not avalable"!!

i really dont understand, where is the problem??
please help me..

thanks in advance.

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