The product photos in this article are not like those of zero gas consumption type. However, the flow chart is a typical example of closed-loop cooling with zero gas consumption, that is, the heating regeneration uses ambient air, and during cooling, the system's residual gas is sent out through the regeneration tower, heated by it, then cooled to room temperature by a cooler, and then sucked in by the fan and pressurized again before being sent back to the regeneration tower to release heat. This process continues in a cycle until the average temperature inside the tower drops below 60 degrees. This type of machine only releases the compressed air inside the tower during a four-hour switch, which is negligible in industry. The significance of zero gas consumption in terms of energy saving is significant, and the technology is advanced and not just empty talk.