Abstract
In this paper, an enhanced FORTRAN code was combined with the EES software to predict the vapor flow thermal resistance effects on the heat transfer characteristics of a two- phase closed thermosyphon (TPCT). Different refrigerants such as water, ammonia, R-11, R-22 and R-134a were tested. Also an enhanced time integration scheme was recommended for solving the governing equations in FORTRAN code.
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Abbreviations
- A :
-
Conductor cross-sectional area (m2)
- AR:
-
Aspect ratio
- c P :
-
Specific heat (J/(kg K))
- D :
-
Diameter (m)
- FR:
-
Filling ratio
- h :
-
Heat transfer coefficient (W/m2K)
- k :
-
Thermal conductivity (W/mK)
- L :
-
Length (m)
- P :
-
Pressure (Pa)
- Q :
-
Heat transfer rate (W)
- T :
-
Temperature (K)
- TPCT:
-
Two-phase closed thermosyphon
- α :
-
Thermal diffusivity (m2/s)
- ρ :
-
Density (kg/m3)
- λ:
-
Length (m)
- ∞ :
-
Environment
- a:
-
Adiabatic section
- i1 or i2:
-
End of heat conductor i
- c:
-
Condenser
- e:
-
Evaporator
- f:
-
Fluid
- i:
-
Component number of the heat pipe
- in:
-
Inner
- n :
-
Time step
- m :
-
Mean
- sat:
-
Saturation state
- out:
-
Outer
- v:
-
Vapor
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Ziapour, B.M., Shaker, H. Heat transfer characteristics of a two-phase closed thermosyphon using different working fluids. Heat Mass Transfer 46, 307–314 (2010). https://doi.org/10.1007/s00231-009-0570-1
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DOI: https://doi.org/10.1007/s00231-009-0570-1