Abstract
Beginning with the concept of micro heat exchangers and its advantages and disadvantages, we illustrate the notion of heat transfer intensification by several innovative designs of mini-scale heat exchangers proposed during our research work. Distinct from other approaches, we do not seek extra fine channel size. On the contrary, we work on how to effectively manage the hydrodynamic aspects and the geometric organization of heat transfer surface to intensify heat transfer with acceptable increase of total pressure drop, for example, using internal (chaotic) mixing, multi-passage configuration and multi-scale geometries. Other influencing factors such as materials, flow maldistribution and fabricating techniques are also discussed for a global consideration of efficient and compact heat exchanger designs.
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- 1.
The dynamic response of a heat exchanger is bimodal, with a rapid response mode that is highlighted here, and a slow response mode governed by the thermal inertia. For the exchangers studied, the relative thermal inertia (ratio of heat capacity of the metal and that of liquid in the channels) is important. So there will be a slow temperature drift after the quick response.
- 2.
The overall heat transfer coefficient for solar receiver is calculated as
$$ h = \frac{E}{T_{out}- T_{in}} \;{\rm ln} \;\frac{T_{h}- T_{in}}{{T_{h}- T_{out}}}$$(4.3)Where, E stands for the heat flux received by the solar receiver, Th, Tin and Tout the average temperature of the heating surface, air temperature at inlet and at outlet, respectively.
- 3.
The general exergy loss (irreversibility) for a two-fluid flow heat exchanger is expressed as the difference of the fluid exergy between the inlet and the outlet:
$$ Ex_{loss} = \dot{m}_{cold} (h_{cold,in} - h_{cold,out} ) + \dot{m}_{hot} (h_{hot,in} - h_{hot,out} ) + T_{0} [\dot{m}_{cold} (s_{cold,out} - s{}_{cold,in}) + \dot{m}_{hot} (s_{hot,out} - s{}_{hot,in})] $$where T0 is the environment absolute temperature.
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Fan, Y., Luo, L., Flamant, G. (2013). Design of Compact Heat Exchangers for Transfer Intensification. In: Luo, L. (eds) Heat and Mass Transfer Intensification and Shape Optimization. Springer, London. https://doi.org/10.1007/978-1-4471-4742-8_4
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