Transfer Laws and Equations of Energy Networks

doi:10.7652/xjtuxb201410011

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Transfer Laws and Equations of Energy Networks

更新时间：2025-07-09

- Transfer Laws and Equations of Energy Networks
- Vol. 48, Issue 10, Pages: 66-76(2014)
- 作者机构：
  
  华南理工大学电力学院,广州,510640
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201410011
  CLC： TK01;TM13
- Online First：10 October 2014，
  
  Published：2014
- 稿件说明：
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Transfer Laws and Equations of Energy Networks[J]. 2014, 48(10): 66-76.
DOI：

Transfer Laws and Equations of Energy Networks[J]. 2014, 48(10): 66-76. DOI： 10.7652/xjtuxb201410011.

摘要

为实现多种类型能源的综合利用

在深入探讨能量本质的基础上

建立了能量网络的基本理论。首先定义了由多条能量传递线(管)路相互连接形成的能量网络

传递不同形式能量的子网通过能量转换器(包括泵、换热器等)互相耦合。然后从能量在空间的普遍化传递方程出发

推导出能量在线(管)路中的普遍化传递方程

并深入分析了能量和火用在线(管)路中传递的变化规律。根据所提方法对电能、热能和压能实际传递过程的分析结果与传统方法相同

证明了其正确性。为建立能量网络方程

将电网络理论中的基尔霍夫定律推广至适合于能量网络建模的广义基尔霍夫定律

然后以能量(火用)在线(管)路中的传递特性方程为基础

推导出普遍化的集中参数等效传递方程

再将所得到的方程统一为能量网络方程组并论证了其可解性。通过对一个由电网络和流体网络组成的简单能量网络的实例计算结果表明

如果用户所需热量恒定不变

当电网络和流体网络分别向用户提供热量的比值不同时

该能量网络会有不同的能耗和火用损

而能耗与火用损并不成正比

因此需要寻求最优的比值

由此证明了所提模型和方法的有效性。比研究可为能量网络的建模、分析、运行与规划奠定了基础。

Abstract

The fundamental theory of energy networks in different energy forms is established following an in-depth analysis of the nature of energy for comprehensive energy utilization. The definition of an energy network is given

in which energy transmits along the wires(pipes)

and a number of wires(pipes)connect with each other to form a network. Energy subnets in different energy forms are interconnected by energy converters

such as pumps and heat exchangers. The generalized transfer equations of energy in wires(pipes)are proposed based on the generalized balance equation of energy in space

and the energy and exergy variation laws in the transfer processes are investigated. The actual transfer processes of several kinds of common energy are then analyzed with the method proposed and the results are proved by conventional analysis. To establish the equations of energy networks

the Kirchhoff's law in electric networks is extended to energy networks

which is called the generalized Kirchhoff's law. Then the generalized equivalent energy transfer equations with lumped parameters are derived in terms of the characteristic equations of energy transfer in wires(pipes). The equations are finally unified into a complete energy network equation set and its solvability is further discussed. A simplified example for energy network composed of an electric network and a fluid network validates the models and methods proposed

and the numerical results show that the energy network has different losses of energy and exergy when it provides different ratio of heat for a constant user heat demand by the electric network and the fluid network respectively

and then the optimal ratio value ought to be sought out for energy efficiency.

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