Thermodroid HD macro - calculation of the Linde cycle

About the Hampson-Linde cycle

This macros helps you to calculate the points of Hampson-Linde cycle.

Fig.1 Hampson-Linde cycle and T-S diagram with the points

Table of symbols
P1 - higher  pressure of the cycle [Pa]
P2 - lower  pressure  of the cycle [Pa]
Tamb - ambient temperature in the cycle [K]
dT - underheating at hot end of exchanger [K]
T1..T5 - temperatures of the cycle points [K]
h1..h5 - enthalpies of the points [kJ/kg]
v2,v3 - vapour fractions of the points
qex - specific heat of the exchanger [kJ/kg]
kL - liquefaction coefficient of the cycle




Macros (refrigerator)

P2=100000

P1=3000000

Tamb=303

dT=10

newfluid(0, methane)

mw=fluid0.molarweight()

fluid0.pvflash(P2,1)

h4=fluid0.massenthalpy()

T4=fluid0.t()

fluid0.ptflash(P2,Tamb-dT)

h5=fluid0.massenthalpy()

T5=fluid0.t()

fluid0.ptflash(P1,Tamb)

h1=fluid0.massenthalpy()

T1=fluid0.t() 

qex=h5-h4

fluid0.phflash(P1,(h1-qex)*mw)

h2=fluid0.massenthalpy()

T2=fluid0.t() 

V2=fluid0.v()

fluid0.phflash(P2,(h2)*mw)

h3=fluid0.massenthalpy()

T3=fluid0.t() 

V3=fluid0.v() 

kL=1-V3



Macros ( liquefier )

P2=100000

P1=20000000

Tamb=303

dT=10

newfluid(0, methane)

mw=fluid0.molarweight()

fluid0.pvflash(P2,1)

h4=fluid0.massenthalpy()

T4=fluid0.t()

fluid0.ptflash(P2,Tamb-dT)

h5=fluid0.massenthalpy()

T5=fluid0.t()
qex=h5-h4
fluid0.ptflash(P1,Tamb)

h1=fluid0.massenthalpy()

T1=fluid0.t()

fluid0.pvflash(P2,0)

hL=fluid0.massenthalpy()

kL=abs((h1-h5)/(hL-h5))
V3=1-kL

fluid0.pvflash(P2,V3)

h3=fluid0.massenthalpy()

T3=fluid0.t() 

fluid0.phflash(P1,(h3)*mw)

h2=fluid0.massenthalpy()

T2=fluid0.t() 

V2=fluid0.v() 

how to use macros in Thermodroid HD
Step 1. Open notepad and copy the text above into the editor.
Step 2. Save this text file to your device sdcard at folder "thermodroid".
Step 3. Run Thermodroid HD

Step 4. Press button "Macro"

Step 5. Press button "Open"

Step 6. Choose at the list our text file.

Step 7. Press button "OK"

Step 8. Press button "Run"

Step 9. Analyze results