Abstract
This study concerns a new type of heat exchangers, which is that of shell-and-double concentric-tube heat exchangers. These heat exchangers can be used in many specific applications such as air conditioning, waste heat recovery, chemical processing, pharmaceutical industries, power production, transport, distillation, food processing, cryogenics, etc. The case studies include both design calculations and performance calculations. It is demonstrated that the relative diameter sizes of the two tubes with respect to each other are the most important parameters that influence the heat exchanger size.
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Abbreviations
- b :
-
Baffle pitch, m
- C :
-
Heat capacity flow rate, W/K
- C p :
-
Specific heat, J/(kg K)
- D :
-
Diameter, m
- d :
-
Inner tube diameter, m
- F :
-
Corrective factor
- G :
-
Mass velocity, kg/(m2 s)
- h :
-
Convective heat transfer coefficient, W/(m2 K)
- K :
-
Overall heat transfer coefficient, W/(m2 K)
- L :
-
Length of tube, m
- M :
-
Mass, kg
- m :
-
Mass flow rate, kg/s
- N c :
-
Number of baffles
- N t :
-
Total number of tubes
- N td :
-
Number of tubes on the shell diameter
- Ntp :
-
Number of tubes by pass
- p :
-
Tube pitch, m
- P T :
-
Friction power expenditure, W
- Δp :
-
Pressure drop, Pa
- Q :
-
Mass flow rate, kg/h
- S :
-
Exchange surface, m2
- S p :
-
Flow cross sectional area, m2
- Τ :
-
Temperature, °C
- ΔΤ ML :
-
Log-mean temperature difference, °C
- v :
-
Fluid velocity, m/s
- Z :
-
Heat capacity flow rate ratio
- δ:
-
Thickness, m
- η:
-
Heat exchanger effectiveness
- κ:
-
Factor taking account of the ratio of the internal and external diameters in the cases of the annular tubes
- λ:
-
Thermal conductivity, W/(m K)
- μ:
-
Dynamic viscosity, Pa s
- π:
-
3.14l59 rad
- ρ:
-
Density, kg/m3
- Φ:
-
Heat flux, W
- υ:
-
Kinematic viscosity, m2/s
- Ω:
-
Darcy coefficient
- Nu :
-
Nusselt number: Nu = hd h /λ
- Pr :
-
Prandtl number: Pr = μC p /λ
- Re :
-
Reynolds number: Re = vd h /υ
- 1:
-
Industrial oil (shell side), outer
- 2:
-
Water, inner
- 3:
-
Industrial oil (inner tube)
- c:
-
Shell
- h:
-
Hydraulic
- i:
-
Inlet
- io:
-
Industrial oil
- o:
-
Outlet
- st:
-
Shell-and-tube heat exchanger
- sdct:
-
Shell-and-double concentric-tube heat exchanger
- t:
-
Wall
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Bougriou, C., Baadache, K. Shell-and-double concentric-tube heat exchangers. Heat Mass Transfer 46, 315–322 (2010). https://doi.org/10.1007/s00231-010-0572-z
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DOI: https://doi.org/10.1007/s00231-010-0572-z