On three forms of momentum equation in transient modeling of residential refrigeration systems

Wei-Jiang Zhang; Chun-Lu Zhang; Guo-Liang Ding

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On three forms of momentum equation in transient modeling of residential refrigeration systems

机译：住宅制冷系统瞬态建模中动量方程的三种形式

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The transient model of thermal components usually consists of three basic governing equations: continuity equation, energy equation, and momentum equation. For different reasons, the momentum equation is used in three different forms: transient, steady-state, and zero pressure drop. In this paper, the three forms of momentum equation are numerically studied and compared at both component level and system level, particularly in the residential applications. It is found that the results with transient and steady-state momentum equation are pretty close at both levels. Therefore, the steady-state momentum equation is recommended in refrigeration system and component transient modeling because of the robustness and the computation speed. To consider only the system-level cases, it is also found that the transient results without pressure drop give very close estimation of control parameters in comparison with the results taking account into the transient or steady-state pressure drop.

机译：热成分的瞬态模型通常由三个基本控制方程组成：连续性方程，能量方程和动量方程。由于不同的原因，动量方程以三种不同形式使用：瞬态，稳态和零压降。本文对动量方程的三种形式进行了数值研究，并在组件级和系统级进行了比较，特别是在住宅应用中。发现瞬态和稳态动量方程的结果在两个水平上都非常接近。因此，由于鲁棒性和计算速度快，建议在制冷系统和组件瞬态建模中使用稳态动量方程。仅考虑系统级情况，还发现与考虑瞬态或稳态压降的结果相比，没有压降的瞬态结果对控制参数的估计非常接近。

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来源
《International Journal of Refrigeration》 |2009年第5期|共7页
作者
Wei-Jiang Zhang; Chun-Lu Zhang; Guo-Liang Ding;
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正文语种 eng
中图分类制冷理论;
关键词
Refrigeration system; Heat exchanger; Calculation; Modelling; Heat transfer; Pressure drop; Transient; Momentum;

机译：制冷系统;换热器;计算;建模;传热;压降;瞬态;动量;

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On three forms of momentum equation in transient modeling of residential refrigeration systems

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