Keeping the soldier cool in a Chemical-Biological-Radiation (CBR) suit

Cooling Solution for CBR Suit

Major Hotspot on the human body

Implications ...• Cooling the chest area would have the

maximum impact of lowering overall bodytemperature.

• Required cooling capacity would be higher.

Individual Metabolism

Close or Open Suit

Environment Temperature

Physical Activity

Body Temperature

Contributing Factors to Higher Body Temperature

Individual Metabolism

Close or Open Suit

Environment Temperature

Physical Activity

Body Temperature

Contradiction

CoolingCapacity

PhysicalWeight

AcceptableWeight

BatteryTechnology

EnergyCapacity

OperatingDuration

CoolingCapacityaffects ...

affects ...interdependency

Passive Cooling• Coolant gel or liquid• Phase change material

Active Cooling• Liquid circulation• Air circulation

Current Solution

*Activated by soaking in a cold medium, use and re-soak for continual operation * Electrically-powered device to drive air or liquid

circulation around hot spot.

Rini Technologies, USA

Rabintex, Israel

US Army, USA

Examples

Method Weight DurationPassive Cooling(coolant)

250g to 1Kg < 1.5 hrs

Passive Cooling(Phase Change Material)

500g to 1.5Kg < 3 hrs

Active Cooling(Liquid circulation)

2 to 3 Kg 2 to 4 hrs

Active Cooling(Air circulation)

500g to 1Kg 5 to 8 hrs

General Comparative Data

Model of a Active Cooling System

• Mount the heated side of Peltier cooler on soldier backserve to dissipate heat + protection from bullets.

Peltier Cooler

New Approaches ...

New Approaches ...

• Use a denser coolant like ferromagnetic liquidto assist in heat conduction.• Ferromagnetic liquid = Ferromagnetic powder + oil

New Approaches ...

• Foot powered liquid pump instead of using a electric pump.

• Reduce the electrical loading.

• Temperature feedback to conserve battery power• Wireless temperature sensor to monitor body hotspot

New Approaches ...

• Externally detachable battery for quick changeoverand continuous operation

New Approaches ...

• Inductive charging for battery

• Possibility of using liquid nitrogen or compressed air capsule as a coolant.

New Approaches ...

Other Improvement to existing solution

Discussion