THERMAL EXPANSION: DESIGN AND OPERATION

摘要

Heat transfer fluid systems are used around the globe to provide indirect heating and cooling to process users. Because all heat transfer fluids will change in volume when heated or cooled - with a potential increase of 30 percent or more when heated from ambient temperatures to normal operating temperatures - an expansion tank is an essential and necessary component in a liquid-phase heat transfer fluid system. A well-designed and properly operated expansion tank is more than just a wide spot in the system to allow for fluid expansion and contraction. It also can: 1. Serve as the main venting point of the system for removal of moisture and low boiling components. 2. Provide positive head pressure to the suction of the circulating pump. 3. Act as a reservoir for fluid that is maintained at a lower temperature than the fluid that is circulating through the system.