Cooling vest, you know?

Cooling vests, also known as ice vests or air-conditioned vests, offer effective cooling and protection for individuals working in high-temperature environments. These vests are designed to shield the body from heat radiation and prevent heat-related injuries. They are considered one of the most efficient, cost-effective, and user-friendly methods for lowering body temperature during prolonged exposure to heat.

These cooling vests are widely used across various industries, including steel manufacturing, smelting, casting, welding, mining, electronics, shipbuilding, and even by police and firefighters. In high-heat settings like steel mills, cooling vests are often used alongside high-temperature protective clothing to enhance safety and comfort.

A typical cooling vest is made up of a thermally responsive fabric combined with a phase-change material (PCM) energy storage bag. The core component is the cooling agent inside the storage bag. Over time, researchers have developed several types of cooling agents, including hydrogels, hard gels, smooth gels, high-efficiency hard gels, polymer gels, and advanced PCM materials. Among these, hard gels, high-efficiency hard gels, and cryogels that don't require refrigeration are more commonly used in the market due to their stability and performance.

The cooling agents used in these vests have high latent heat values, allowing them to absorb and store large amounts of heat energy. For instance, hard gel coolants have a latent heat value of λ ≥ 240 kJ/kg, while hydrogel coolants can reach λ ≥ 320 kJ/kg. This means the vest can maintain a low temperature for an extended period, providing consistent cooling without causing skin irritation. Additionally, they are non-toxic and environmentally friendly, making them safe for long-term use.

How do cooling vests work? Before use, the energy storage bag is placed in a refrigerator or ice water for a certain amount of time to be fully charged. Once worn, the stored cold energy is released gradually, creating a cooling effect on the body. This helps reduce core body temperature and improves overall comfort, especially in extreme heat conditions.

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