没必要购买汽油以运行太阳能供热系统，因为阳光对每个人来说都是免费的。

There is no need to purchase fuel to operate a solar heating system, because sunshine is free to everyone.

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本文建立了强制循环闭式太阳能供热系统的三维数值模型，然后用CFD软件对其进行分析。

In this paper, the three-dimensional numerical model of the forced convection closed loop solar water heating system was established, and then analyzed the simulation date using the CFD.

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智能化太阳能密集烤房由太阳能供热系统、煤燃烧供热系统、装烟系统、通风排湿系统和自动控制系统等部分构成。

An intelligent solar bulk curing barn includes solar heating system, coal heating system, leaf loading system, ventilation system and automatic control system.

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