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

� Oblique finned microchannel geometry

3-D viewTop view

(showing oblique fin structure)

�� �� �� � �� � � � �� � � � �� � �� � � � � � � �� �Traditional channel

Oblique finned channel

� Reinitializes Boundary layer- increases heat transfer for same coolant flow rate.

(a) Traditional channel

� Uniform Temperature Distribution

(b) Oblique finned channel

� 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

� 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

�

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

� 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

� Wind turbine system

Application in waste heat recovery in turbine system

� Green building

Oblique fin heat exchanger

Oblique fin heat exchanger in green building for waste heat recovery

� Refrigeration system

Oblique fin heat exchanger

Waste heat recovery in refrigeration system through oblique fin enhanced condenser and evaporator

Warm water Waste heat

� HVAC system

Oblique fin heat exchanger - low flow rate and pumping power

Waste heat recovery in HVAC system using Oblique fin structure

� 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.

Thank You