Patent ID: 7562699

Claim:
A fluid circulating apparatus for adjusting a temperature of a material, the apparatus comprising: a pressurized fluid source operative to adjust a temperature of a fluid and operative to push the fluid under pressure out through a supply port at a supply temperature and operative to draw the fluid in through a return port at a return temperature; a flow control operatively connected to the supply port and the return port of the fluid source; a conduit having a first end operatively connected to the flow control and a second end operatively connected to the flow control and adapted to be arranged in proximity to the material; wherein the flow control is operative, in a forward mode, to direct fluid from the supply port of the fluid source into the first end of the conduit and from the second end of the conduit to the return port of the fluid source such that fluid circulates through the conduit in a forward direction; wherein the flow control is operative, in a reverse mode, to direct fluid from the supply port of the fluid source into the second end of the conduit and from the first end of the conduit to the return port of the fluid source such that fluid circulates through the conduit in a reverse direction; and a mode selector operative to periodically switch the flow control between forward mode and reverse mode during an operation to raise or lower the temperature of the material.