DESIGNS OF HEAT EXCHANGER DEVICES ON TWO-PHASE HEAT TRANSFER ELEMENTS FOR AIR HEAT DISPOSAL IN VENTILATION SYSTEMS: OVERVIEW

Yevgeny Alekseik
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Abstract

Background. Heat exchangers-utilizers for recovery of ventilation air heat are widely used for increasing of buildings energy efficiency. Two-phase elements, such as: thermosyphons, heat pipes and pulsating heat pipes are applied to these heat exchangers for increasing of efficiency of heat transfer between hot and cold air. But such heat exchangers should have high temperature efficiency, enthalpy efficiency and energy efficiency at low aerodynamic drag. Moreover, working conditions of ventilation systems, such as: relatively low working temperatures and low temperature difference between hot and cold air, make it difficult to choose heat carriers for two-phase elements. Thus, it is necessary to solve a number of complex problems for designing of effective heat exchangers-utilizers based on two-phase elements. Objective. To find out unresolved and understudied issues of designing of heat exchangers-utilizers based on two-phase elements for ventilation systems. Methods. Analysis of described in literature designs, their characteristics and results of investigations. Results. General features of two-phase elements based heat exchangers-utilizers designs and a number of issues which need further investigation were detected as a result of literature sources analysis. Conclusions. Heat exchangers based on two-phase heat transfer elements have wide perspective of applying and provide full heat efficiency up to 85%. But there is a number of unsolved issues connected with: optimization of two-phase elements and heat exchangers design, ribbing optimization, investigation of heat transfer intensity and heat transfer coefficients, investigation of aerodynamic drag, condensate rejecting.
通风系统中空气热处理用两相传热元件的热交换装置设计:概述
背景用于回收通风空气热量的热交换器被广泛用于提高建筑物的能源效率。这些热交换器采用了热虹吸管、热管和脉动热管等两相元件,以提高冷热空气之间的传热效率。但是这样的热交换器应该在低空气动力学阻力下具有高的温度效率、焓效率和能量效率。此外,通风系统的工作条件,如:相对较低的工作温度和冷热空气之间的低温差,使两相元件难以选择热载体。因此,有必要解决许多复杂的问题,以设计基于两相元件的有效换热器利用器。客观的找出基于两相元件的通风系统换热器利用器设计中尚未解决和研究不足的问题。方法。分析了文献中描述的设计,它们的特点和调查结果。后果通过文献来源分析,发现了基于两相元件的换热器利用器设计的一般特征和一些需要进一步研究的问题。结论。基于两相传热元件的换热器具有广阔的应用前景,可提供高达85%的全热效率。但也有许多悬而未决的问题:两相元件和换热器设计的优化、肋条优化、传热强度和传热系数的研究、气动阻力的研究、冷凝水排除。
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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