The hardening case depth and hardness curve can be changed by adjusting heating time, heating power and cooling speed during induction hardening.

在感应淬火中，通过改变加热时间、加热功率和冷却速度可以改变淬硬层深度和硬度梯度。

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Heating boiler is a kind of commonly used boiler, which USES coal, fuel oil, gas, power and other fuels as heating source.

采暖锅炉是一种常用的锅炉，它以煤、燃油、燃气、动力电等燃料为加热源。

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Comparing with the other traditional heating equipments, induction heating power supply has tremendous advantage, and has an extremely extensive application in the industrial production now.

相比较传统的加热设备，感应加热电源具有极大的优势，在现在的工业生产中有着极为广泛的应用。

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For one thing, there's disagreement over how much it should cost for the Capitol Power Plant--which provides heating and cooling power to Congress--to use cleaner-burning natural gas instead of coal power.

FORBES: The Greening Of The Hill

Rather than letting the heat escape, a cogeneration plant uses the excess energy to power a heating and cooling system.

FORBES: The Most Efficient Power Plants

In reducing dependence on coal and natural gas for power and heating, and petroleum for transportation, biofuels have proved to be much less promising than advertised.

FORBES: Renewable Energy Delusions: Getting A Real Grip On Alternatives