直到几年前，能源还既便宜又丰富。然而，今天的情况却截然不同。燃料成本急剧上升，并继续上升。减少燃油消耗越来越普遍。由于这些条件，节能的必要性变得非常明显。节能提供了一种显著降低设施运营成本的方法。此外，在许多情况下，节能能力可能意味着持续运行或因燃料短缺而关闭之间的差异。或者，在无法获得额外燃料供应的情况下，节能可能是扩大运营的唯一手段。本文探讨了热的使用- 管道换热器作为能量回收装置，考虑到环境保护的需要，这增加了对使用节能技术的需求。引文:德克萨斯州达拉斯ASHRAE交易会第82卷第1部分研讨会

Until several years ago, energy sources had been both inexpensive and abundant. Today's situation, however, is drastically different. Fuel costs have risen dramatically and continue to rise. Fuel curtailments are becoming ever more common. As a result of these conditions, the need for energy conservation has become extremely apparent.Energy conservation offers a way to significantly reduce facility operating costs. Furthermore, in many cases, the ability to conserve energy may mean the difference between continuing operations or closing down due to fuel shornages. Or, where additional supplies of fuel are unavailable, energy conservation may constitute the only means of expanding operations.This paper explores the use of heat-pipe exchangers as energy recovery devices taking into account the need for environmental protection which has increased the demand for use of conservation techniques.