FEATURES OF CALCULATION OF ON-BOARD HEAT EXCHANGERS

Q4 Engineering 内燃机学报 Pub Date : 2021-07-26 DOI:10.20998/0419-8719.2021.1.07
U. L. Moshentsev, А. А. Gogorenko
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引用次数: 0

Abstract

Aspects of designing an onboard heat exchangers for the cooling system of the ship's power plant are considered. Such heat exchangers must be designed in accordance with the classical foundations of the theory and calculation of heat exchangers. At the same time, the key design points are considered by well-known sources in a separate setting related to the peculiarities of their consideration as specific elements of the theory. In this regard, they are not united by a single system necessary for their use in specific design problems. Accordingly, the paper highlights, concretizes and refines the parameters of the formulas used in the computational problem. In particular, the calculation of the heat transfer coefficient from the seawater side is performed according to the formula that gives the average value of the coefficient for the vessel. The heat transfer coefficients from the side of the coolant of the inner loop are calculated according to the well-known formulas recommended for calculating heat transfer in channels of any shape. Attention is drawn to the fact that heat transfer from the hold side goes to the finned wall. In this regard, the heat transfer coefficients determined by the indicated formulas should be considered convective. The transition to the given values of the heat transfer coefficients should be carried out considering the efficiency of the finned heat exchange surface, which considers the uneven temperature of various sections of the heat exchange surface. The calculation of heat transfer was carried out considering possible surface contamination. The procedure for performing the calculation steps is proposed, as a result of which the dimensions and heat engineering parameters of the heat exchanger can be determined. It was found that the use of the considered proposals leads to results close to those recommended by authoritative sources. The above proposals do not contradict the experience of creating and designing such structures. The recommendations can be used for educational and practical purposes by those who design heat exchangers of similar designs.
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车载换热器的计算特点
讨论了船舶动力装置冷却系统的船载换热器的设计问题。这种换热器必须按照换热器理论和计算的经典基础进行设计。与此同时,关键的设计点是由知名的来源在一个单独的环境中考虑的,这些环境与他们作为理论的特定元素的考虑的特殊性有关。在这方面,它们并没有统一到一个单一的系统中,以便在特定的设计问题中使用它们。相应地,本文对计算问题中所用公式的参数进行了突出、具体化和细化。特别是,海水侧的传热系数的计算是根据给出船舶系数平均值的公式进行的。内回路冷却剂侧面的换热系数是根据任何形状的通道中推荐的众所周知的换热公式计算的。需要注意的是,热量从货舱一侧传递到有翅片的壁上。在这方面,由所示公式确定的换热系数应被认为是对流的。对给定换热系数的转换应考虑翅片换热表面的效率,考虑换热表面各部分温度的不均匀性。考虑了可能存在的表面污染,进行了传热计算。提出了计算步骤的执行程序,从而确定换热器的尺寸和热工参数。结果发现,采用审议后的提案所产生的结果接近权威来源所建议的结果。上述建议与创建和设计此类结构的经验并不矛盾。这些建议可供设计类似设计的热交换器的人员用于教育和实际目的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
内燃机学报
内燃机学报 Engineering-Mechanical Engineering
CiteScore
1.00
自引率
0.00%
发文量
3050
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