NITROCOOL™ Retrofit System  [ Return towards  Equipment  ]

The system will:

• Increase Cooling Rate Dramatically (70°C/min.)
• Save Time, Increase Productivity
• Augment Test Chamber Reliability
• Eliminate Compressor Maintenance Issues
• Eliminate CFC, HFC and Chiller Plants
• Eliminate Compressor Heat, Noise, Floor SpaceOptimize LN2 usage
• Reduce Costs Further with N2 Recycling Option
• Benefit from Turnkey Solution from AIR LIQUIDE

• Why Retrofit a Mechanically-Refrigerated Test Chamber to Liquid Nitrogen ?

The use of Environmental Stress Screening (ESS) and Accelerated Stress Testing (AST - HALT and HASS) techniques has increased significantly in electronics manufacturing. These techniques help to precipitate latent defects, detect design flaws, and help improve product quality and reliability while reducing product development time, manufacturing costs and warranty issues.

With the proliferation of AST, rapid temperature ramp rates of 45° C are required to ensure proper testing. Typically, such temperature changes can only be accomplished by using liquid nitrogen as a cooling medium in the environmental test chamber. By converting a freon-based mechanical cooling chamber to liquid nitrogen (LN2), ramp rate of 70° C per minute can be attained. Whether you perform ESS or AST, faster ramp rates reduce cycle time and allow higher product throughput.

• System Description & Features :

Retrofitting an environmental test chamber typically involves the addition and upgrade of key components

Liquid Nitrogen Injection System :

Direct or indirect (coils) injection system
Unique liquid nitrogen control valve assembly
Passive exhaust system to evacuate the gaseous nitrogen
Control System and Software :

Auto optimizing (self-tuning) and compensating for changes in cycle within the same test
Run dynamic loads that change both within the cycle and from cycle to cycle
Energy efficient, reduced set up time are reduced by the elimination of PID loops
Software designed to protect the products being tested
The software was written by experienced end users and especially for environmental test chamber

Ceramic Heater :

Designed to prevent premature failure due to overheating
Additional Features :

Adjustable air flow
Data logging
Use of standard industrial components with no custom parts
Vibration option available

• N2 Recycling Option (*)

Although cost-effective when using cryogenic liquid, there is an increasing need to reduce the cost associated with liquid nitrogen usage. The unique and patent pending nitrogen recycling option allows the reuse of the nitrogen in other plant applications. This allows the optimization of the heat exchange process while reducing greatly operations costs.


NITROCOOL™
Liquid Nitrogen Retrofit System for Environmental Test Chamber Conversion

(*) patent pending AIR LIQUIDE