Oblique finned microchannel geometry Lee Poh Seng_neeconf.pdfMicrosoft PowerPoint - Ppt0000020...
Transcript of Oblique finned microchannel geometry Lee Poh Seng_neeconf.pdfMicrosoft PowerPoint - Ppt0000020...
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Na t io na l E n e r g y E f f ic i e n t Co n f e r e n c e2 4- 2 5 Ma y 2 0 1 1, Su n t ec Co n v e n t io n C e n t e r, S i n ga po r e
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� Oblique finned microchannel geometry
3-D viewTop view
(showing oblique fin structure)
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�� �� �� � �� � � � �� � � � �� � �� � � � � � � �� �Traditional channel
Oblique finned channel
� Reinitializes Boundary layer- increases heat transfer for same coolant flow rate.
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(a) Traditional channel
� Uniform Temperature Distribution
(b) Oblique finned channel
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� Advantage of oblique structure
�Wide heat flux dissipation range (10 ~ 1000 W/cm2)
�Better heat transfer at same coolant mass flow rate
�Negligible pumping power penalty
�Uniform wall temperature distribution
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� Direct benefits
� Improves process efficiency by decreasing energy consumption
� Indirect benefits
� Significant thermal and air pollution reduction
� Reduces overall equipment size
� Reduces auxiliary energy consumption
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�
Higher the temperature of the source, higher the quality of energy.
This implies more of thermal energy can be
converted to useful work (Higher thermal efficiency- ηth).
Source- Coolant at outlet, TH
Sink- Ambient, TC
WHRSηth
TH, K ηth, %
925 67.2
800 62.1
700 56.7
500 39.4
350 13.4
ηth increases with TH
for same ambient temp., TC
Work
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� The novel high performance cooling technology allows a
substantially lower flow rate for same heat transfer.
� This means higher exit temperature of the working fluid
and hence higher potential for waste heat harvesting (from
8.4% to 18.3%).
Texit, °°°°C ηth, %
55 (with conventional cooling technology) 8.4
100 (with our high performance, energy efficient cooling technology)
18.3
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� Wind turbine system
Application in waste heat recovery in turbine system
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� Green building
Oblique fin heat exchanger
Oblique fin heat exchanger in green building for waste heat recovery
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� Refrigeration system
Oblique fin heat exchanger
Waste heat recovery in refrigeration system through oblique fin enhanced condenser and evaporator
Warm water Waste heat
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� HVAC system
Oblique fin heat exchanger - low flow rate and pumping power
Waste heat recovery in HVAC system using Oblique fin structure
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� NDA signed with a world leader in air conditioning systems, services and solutions.
� Working with their engineering team to exploit this technology to control the comfort of the air for people in domestic, industrial and institutional buildings.
� High potential for applications in environmental technology and energy conservation to make a difference in energy efficiency around the globe.
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Thank You