Heat Pump with CO2 as Refrigerant

[wp09]

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.

 

[jcazenave]

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

 

[wp09]

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.