heat economizer

例句：

1. 1. The heat engine usesa heat exchanger to convert waste heatinto useful work.
   热机使用热交换器将废热转化为有用功。
2. 2. Theeconomical design of the heat exchangerhelps to reduce energy consumption.
   热交换器的节能设计有助于降低能源消耗。
3. 3. The engineers designed a new type of heat exchanger that can withstand higher temperatures.
   工程师们设计了一种耐高温的新型热交换器。