Evaporative Spray Cooling

HIGH POWER ELECTRONICS COOLING SOLUTIONS 407/359.7138 • www.rinitech.com

BENEFITS: Evaporative Spray Cooling of High Power 3 to 5X increased inverter power Electronics (HPE) density and specific power The military, automotive and Enables full power module industrial market demand has operation with 100°C coolant grown for high-power electronics Easily integrated into power applications such as hybrid & electric vehicles, high power inverter packaging and existing military applications, motor cooling loops controls, buss converters and other Top View Low coolant flow rates devices. High-power electronics are challenge by high heat flux and the need to reject large amounts APPLICATIONS: of heat in high temperature ambient Hybrid & Fuel Cell Electric Vehicles conditions in order to maintain High Power Military Applications device temperatures. This in turn has driven up coolant flow rates, DC to DC Converters power consumption and heat Bottom View DC to AC Inverters exchanger size. High Frequency Switching RINI has developed evaporative spray cooling technology to meet this challenge head-on, providing thermal management far superior to the standard single-phase cooling techniques used today. Using a two-phase SPECIFICATIONS: cooling approach increases cooling efficiency allowing for high power density 250kW inverter along with high coolant temperatures (100°C). Because of this, the cooling 100°C water/glycol loop can be integrated with the vehicle cooling systems, improving the Size Weight and Power (SWaP) performance. IGBT temperature of 125°C Coolant flow rate 2.7GPM How Evaporative Spray Cooling Systems Work: Evaporative Spray Cooling (ESC) technology harnesses the ability of liquids to absorb large amounts of energy during phase-change. Nozzles are used to distribute liquid droplets onto heated surfaces such as inverter module

components. This approach reduces Data based on 100°C coolant the overall thermal resistance of the 100 electrical package, enabling high 90 ambient temperature operation and 80 RINI: 2.7GPM, more than 3 times higher power density. 100°C coolant 70 RINI’s ESC method is easily adapted 60 to power inverter packaging, requiring 50 no modifications to the electrical 40 architecture and no direct wetting of 30 COTS: 5.3GPM, the power electronics. This seamless 100°C coolant 20

integration method uses water-glycol % Inverter Full Power Load 10 or water-alcohol with existing 0 cooling loops. 110 115 120 125 130 IGBT Junction Temp. (°C)

About RINI Technologies: RINI Technologies provides innovative solutions to the toughest thermal- management challenges. The company specializes in advanced Evaporative Spray Cooling (ESC), Thermal Energy Storage (TES) solutions and miniature refrigeration systems. Applications include high-power lasers, power electronics, and personal cooling. Contact RINI Technologies today to discuss how its engineers can address your cooling concerns with a complete system solution. Hybrid Vehicles

High Power Military Applications

DC to DC Converters