| 摘要 |
<p>A very simple and inexpensive heat exchanger comprises a closed vessel (V) having thermally conducting walls and helium gas within the vessel. The helium gas is a heat transfer medium between a source of heat (H,T1) or cold and the vessel walls are a heat transfer medium between the helium gas and a fluid (T2, T3) in contact with the walls to be heated or cooled. </p> |
