Enhancement of Heat Transfer with Pool and Spray Impingement Boiling on Microporous and Nanowire Surface Coatings

Technical Report · Wed Sep 01 00:00:00 EDT 2010

DOI:https://doi.org/10.2172/990105· OSTI ID:990105

Thiagarajan, S J; Wang, W; Yang, R; Narumanchi, S; King, C

The DOE National Renewable Energy Laboratory (NREL) is leading a national effort to develop next-generation cooling technologies for hybrid vehicle electronics. The goal is to reduce the size, weight, and cost of power electronic modules that convert direct current from batteries to alternating current for the motor, and vice versa. Aggressive thermal management techniques help to increase power density and reduce weight and volume, while keeping chip temperatures within acceptable limits. The viability of aggressive cooling schemes such as spray and jet impingement in conjunction with enhanced surfaces is being explored. Here, we present results from a series of experiments with pool and spray boiling on enhanced surfaces, such as a microporous layer of copper and copper nanowires, using HFE-7100 as the working fluid. Spray impingement on the microporous coated surface showed an enhancement of 100%-300% in the heat transfer coefficient at a given wall superheat with respect to spray impingement on a plain surface under similar operating conditions. Critical heat flux also increased by 7%-20%, depending on flow rates.

• Research Organization: National Renewable Energy Lab. (NREL), Golden, CO (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC36-08GO28308
• OSTI ID: 990105
• Report Number(s): NREL/CP-540-48055; TRN: US201020%%508
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
33 ADVANCED PROPULSION SYSTEMS
77 NANOSCIENCE AND NANOTECHNOLOGY
ALTERNATING CURRENT
BOILING
COPPER
CRITICAL HEAT FLUX
DIRECT CURRENT
FLOW RATE
HEAT TRANSFER
IMPINGEMENT
MANAGEMENT
NATIONAL RENEWABLE ENERGY LABORATORY
POWER DENSITY
SURFACE COATING
VIABILITY
WORKING FLUIDS
ELECTRIC DRIVE THERMAL MANAGEMENT
THERMAL INTERFACE MATERIALS
MICROPOROUS COATINGS
VEHICLE POWER ELECTRONICS
TWO-PHASE FLOWS
HYBRID ELECTRIC VEHICLES
Transportation