BES（Building Energy Saver）is a new generation of energy storage products, with the function of storing and releasing latent heat and adjusting sharp temperature differences. The principle is to absorb heat or release heat through its own phase conversion, absorb solar heat during the day, convert and release heat at night, and achieve the effect of the temperature required by the human body or objects. And according to the change of the ambient temperature in different Spaces to form a relatively constant temperature microclimate, to achieve temperature regulation, so that the temperature of different Spaces is always maintained in the comfortable temperature range, the effect is equivalent to the room or objects installed with a no energy consumption "air conditioning". The products can be widely used in warehouses, computer rooms, commercial civilian buildings, but also can be used in outdoor camps, military posts and other fixed or temporary stations