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首页> 外文会议>ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress: Advanced Energy Systems Division; 20031115-20031121; Washington,DC; US >ON THE SIGN CONVENTION IN THERMODYNAMICS - AN ASSET OR AN EVIL
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ON THE SIGN CONVENTION IN THERMODYNAMICS - AN ASSET OR AN EVIL

机译：关于热力学中的符号公约-资产还是邪恶

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摘要

In thermodynamics the sign convention normally used is energy added to a system in the form of heat is taken as positive and that added in the form of work is taken as negative - HIP to WIN (heat in positive - work in negative). This is a common sign convention although some texts specify that all forms of energy added to a system as heat or work are positive. However, regardless of the sign convention adopted for heat and work interactions, later in the same text the specified convention is abandoned in favor of magnitudes or absolute values. This occurs particularly in relation to cycle analyses in which the absolute value is used for energy transfers. Generally for reversible cycles there is no proof as to why the ratio of energy added/rejected via heat transfer equals the ratio of the absolute temperatures of the thermal reservoirs. To promote sign convention consistency, this paper develops the appropriate relationship between energy transfers and thermal reservoir temperatures for reversible cycles and applies the result to power producing and power consuming engineering devices.
机译：在热力学中，通常使用的符号约定是将以热的形式添加到系统中的能量视为正，将以功的形式添加的系统中的能量视为负-HIP到WIN（正向为热，负向为功）。这是一种常见的符号约定，尽管某些文本规定，随着热量或功的增加，添加到系统中的所有形式的能量都是正的。但是，无论热和功相互作用采用什么符号约定，在同一文本的后面，都放弃了指定的约定，而采用幅度或绝对值。尤其是在循环分析中发生这种情况，在循环分析中，绝对值用于能量传递。通常，对于可逆循环，没有证据表明为什么通过热传递增加/减少的能量之比等于蓄热器的绝对温度之比。为了提高符号约定的一致性，本文针对可逆循环建立了能量传递与蓄热库温度之间的适当关系，并将结果应用于发电和耗电的工程设备。

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