建环专业英语

建筑环境与设备工程专业英语翻译

A thermodynamic system is a region in space or a quantity of matter bounded by a closed surface. The surroundings include everything external to the system, and the system is separated from the surroundings by the system boundaries. These boundaries can be movable or fixed, real or imaginary.

一个热力学系统是一个在空间或有事项的数量由一个封闭的表面范围内的区域。周围环境包括一切外部系统，系统是从周围环境隔开的系统边界。这些边界可以是动产或固定的，真实的或想象。

The concepts that operate in any thermodynamic system are entropy and energy. Entropy measures the molecular disorder of a system. The more mixed a system, the greater its entropy; conversely, an orderly or unmixed configuration is one of low entropy. Energy has the capacity for producing an effect and can be categorized into either stored or transient forms as described in the following sections.

熵和能量的概念，在任何热力学系统操作。熵措施分子系统紊乱。更为复杂的系统，其熵值越大，反之，有序或纯配置是低熵之一。能源已经产生效果的能力，并在下面的章节中所述，可以存储或短暂形式分类。

Heat Q is the mechanism that transfers energy across the boundaries of systems with differing temperatures, always toward the lower temperature. Heat is positive when energy is added to the system.

Work is the mechanism that transfers energy across the boundaries of systems with differing pressures (or force of any kind), always toward the lower pressure. If the total effect produced in the system can be reduced to the raising of a weight, then nothing but work has crossed the boundary. Work is positive when energy is removed from the system. 热量Q与不同的温度，跨系统的边界传输能量总是向温度较低的机制。热是积极的，当能量被添加到系统中。

功是指通过存在压差（任一种力）的系统边界传递能量的作用过程，总是指向低压，如果系统中产生的总效果能被简化为一个重物的提升，那么只有功通过了边界，当能量从系统中一出时，功是正的。

A property of a system is any observable characteristic of the system. The state of a system is defined by listing its properties. The most common thermodynamic properties are temperature T, pressure p, and specific volume v or density ρ. Additional thermodynamic properties include entropy, stored forms of energy, and enthalpy.

Frequently, thermodynamic properties combine to form other properties.

Enthalpy h, a result of combining properties, is defined as: h=u+pv where

u is the internal energy per unit mass

系统属性是系统的任何观察到的特征。系统状态的定义是通过列出其属性。最常

见的热力学性质的温度T，压力P，和特定的体积V或密度ρ。其他热力学性质

包括熵，能量储存形式，和焓。

通常情况下，热力学性质相结合，形成其他属性。焓H，一个属性相结合的结果，

被定义为：H = U + PV

其中u是每单位质量的内部能量

Each property in a given state has only one definite value, and any

property always has the same value for a given state, regardless of how

the substance arrived at that state.

A process is a change in state that can be defined as any change in the properties of a system. A process is described by specifying the initial

and final equilibrium states, the path (if identifiable), and the

interactions that take place across system boundaries during the process.

一个给定的状态的属性只有一个定值，和任何财产总是有相同的值给定的状态，

不管物质如何达到那种状态。

一个进程是一个状态的改变，在系统属性的任何改变，可作为定义。一个过程是

指定的初始和最终的平衡状态，路径（如果识别），并采取跨系统的边界，在这

个过程中发生的相互作用。

A pure substance has a homogeneous and invariable chemical composition.

It can exist in more than one phase, but the chemical composition is the

same in all phases 一个周期进程的一个过程或一个系列，其中系统的初始和

最终状态是相同的的。因此，在一个周期结束时，所有属性具有相同的价值

纯物质具有均匀的和不变的化学成分。它可以存在于超过一个阶段，但在各个阶

段的化学成分是一样的

liquid. If the temperature of the liquid is lower than the saturation

temperature for the existing pressure, it is called either a subcooled

liquid (the temperature is lower than the saturation temperature for the

given pressure) or a compressed liquid (the pressure is 如果一种物质在

饱和温度和压力的液体，它被称为饱和液体。如果液体的温度低于现有的压力的

饱和温度，它被称为是过冷液体（温度低于给定压力的饱和温度）或压缩液体（压

力大于饱和为给定的温度压力）。