NEC has developed an eco-friendly cooling system for CPUs, said to use 60% less energy than a water-cooling system and even 80% less than an air-cooling system. The core of the system is a liquid chlorofluorocarbon (CFC) substitute, which circulates around the CPU to draw away heat and has low greenhouse effects. NEC says the refrigerant begins boiling at around 50oC, changes into vapor that absorbs the heat coming from the CPU, then flows through a tube, and is cooled by a fan in a radiator before changing back into liquid. After that, the process in the closed loop starts again. According to NEC, the cooling fan doesn’t have to work as much as under other cooling systems and needs less energy.
