Using Portable Cooling System To Conquer Heat Stress

DS Kool cooling vest bring cooling in extreme environment
By: Vivian Deng
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Feb. 25, 2009 - PRLog -- Soldiers work in hot climates, particularly for long periods, are physically stressful and can compromise their safety, focus and efficiency. More worse is they should to put on the exposure suit so that hinder the thermal volatility, and affected the battle efficiency because of the heat energy consumption; In addition the test process indicates: High temperature of  human body will cause the massive blood to flow to the skin to radiate, thus will affect the judgment. How to improve the individual equipment, to promote battle efficiency of soldier's under high temperature?  This problem has aroused various countries’ attention. Aimed at the individual portable cooling system, scientific researchers have carried out various researches.
According to the record: in 1989, the United States Navy packed the ice water in the around pocket to decrease temperature. This primitive cooling method is loading with ice water into soft tube and seaming it in the vest. They used a water pump to circulate the ice water. This kind of temperature decrease system also be named individual cooling system. This system enables approximately 2 liter ice water circulations with the pump, and the cooling time approximately to maintain 35-45 minute. This system could match with chemical-proof suit and anti-exposure suit, but because the working time is comparatively short, therefore it had not been use widely.
In 1991 Gulf War period, US military and the Multinational troops entered into the Gulf region. In order to keep good performance of the ground crews under the extreme hot weather in the field with chemical agent, the US Air Force invested 3,860,000 US dollars for Fairchild airplane company (Fairchild) to develop a kind of new system of intermittent multi-person to decrease temperature. This system is composed by air-conditioner, chemical agent filter and vest. The air-conditioner produces cold air to flow through the soft tube into the chemical agent filter, and then through into exposure suit. This system could simultaneously provide cold air for 10 ground crews.
It is reported: Accredited British soldiers in Afghanistan patrol by scimitar tank in desert.  In vehicle's maximum temperature may reach 70 ℃. In order to solve the high temperature problem, British scientists developed a set of simple cooling system: Inserts the coat and the pants with two tubes, the other end of the tube was connected with the tank vent. So that the low temperature air from outside could blow into clothes, and the temperature can be dropped to 58 ℃.
Another report: The United States Navy air force command is developing one kind system called “cooling armature” vest type air-conditioning system. The whole set system only notebook size, weights 5 kilograms. It equals the bulletproof cover which is using in the present United States Navy and the Marine Corps pilots. When using, it should be installed in the front part of pilot's vest, and hanging with the Gallus on the shoulder. “Cooling armature” is one kind of portable, dual cycle cooling system. This system method is: to breathe in the periphery air through a set of filter into an air conditioner which is located at one side of air intake, the modulatory air blows into the inner pipe of flight garment and cooling the aviator’s body. After the system starts run, the internal fan will open, and will release cooling air. This could reduce pilot’s around temperature to 18 ℃. “Cooling armature” use battery as power supply so that will not influence airplane power supply. Even if pilot leaves the airplane, it can also be used It is anticipated in 3 years later this system will equip F/A-18 hornet .
At present, the majority helicopters in our country depend upon small fan to decrease temperature.
In order to deal with the extremely temperature, the US military is pressing on with the research and development of new personal temperature control equipment to guarantee army's battle effectiveness under extreme temperature.  American “INFORMATION RESEARCH CENTER” (Also known as Natick laboratory) developed “Interceptor” the air cooling vest, is based on this demand to develop the first batch of practical equipment. It uses the honeycomb structure, and promotes the air through the electrically Ventilating Fan between the exposure suit and skin, thus achieves the hypothermia and the auxiliary perspiration effect. It is reported that this product started from last year to allocate for the soldiers who quartered at Baghdad as well as the Tikrit army. According to the feedback, the designer will make some improvement of it. Such as using a better compatibility battery, reducing the engine weight, ventilator noise and so on.
At present another new portable individual cooling system has already successfully made out in our country. It takes Shenzhen DS Kool cooperation limited 5 years to make it out, and in 2007 October officially launched out.
This cooling set is composed by the cooling vest and cooling system. Around the vest covers the snake-shaped plastic pipeline. This cooling system has battery, pump, ice bag as well as other parts. After testing, the cooling vest can work at least 4 hours under 40 degrees, and may provide cooling after changing the coolant.  According to the request, the temperature can be set at 15 degrees centigrade, 17 degrees centigrade as well as 20 degrees centigrade and so on.  Meanwhile this cooling system could also provide drinking water according to the demand of the user.
This portable individual cooling vest can be wear next to skin and the cooling system can be put in the knapsack, so it is very convenient for movement cooling.  Moreover this system may also put into tank, helicopter, fighter plane and so on. Therefore it will widely used in the air force, the navy as well as the army under high temperature environment, thus maintains the soldier physical strength promotes the battle efficiency.
In summary, cooling system gradually become the new essential equipment for different arms of services, but at present the most cooling types have not able to meet the soldier’s need in the function aspect, free movement aspect, and long working time aspect.
This article published in "ORDNANCE INDUSTRY SCIENCE TECHNOLOGY" in 2007 the 6th issue
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DS Kool has been tested by US Military to be highly effective at maintaining the user’s body temperature at safe levels and for longer periods than any other self-contained cooling system available.
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