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Performance Comparison and Suitable Climatic Zones of Three Water-Mediated Evaporative Cooling Technologies

Energy Conversion and Management(2023)SCI 1区

Tsinghua Univ

Cited 9|Views25
Abstract
Evaporative cooling is an alternative cooling technology to conventional vapor-compression systems with lower energy use and pollution emissions. This paper presents theoretical performance comparison for three water mediated evaporative coolers and provides a design guideline for choosing evaporative coolers under specific climates and operating boundary conditions. Theoretical solutions of counter-flow evaporative cooling are given and verified with maximum absolute and relative errors of 0.26 K and 1.23% respectively. The heat transfer coefficient of the combined heat and mass transfer is 2.72-4.95 times than the pure heat transfer process if there were no mass transfer. Climatic dividing lines of various technologies are affected by the design parameters of the system, dropping the psychrometric chart into different applicable climatic areas. The simulation results show that the climatic areas in psychometrics where indirect outperforms direct evaporative cooling will expand when increasing the air-water ratio and heat transfer coefficient, and climatic area of series indirect evaporative cooling shrinks when increasing temperature difference. The simplified selection method using such difference in merits is verified by case study, which can serve as a useful guideline for choosing the proper evaporative cooling technology for a wide range of geographical locations.
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Key words
Indirect evaporative cooling,Theoretical model,Water-mediated,Dew point,Climatic condition
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要点】:本文对比了三种水介导的蒸发冷却技术在不同气候条件下的理论性能,并提供了针对特定气候和操作边界条件选择蒸发冷却器的设计指导。

方法】:通过对逆流蒸发冷却的理论解析,计算了最大绝对误差和相对误差,并比较了有质传递和无质传递情况下热传递系数的差异。

实验】:通过模拟实验,分析了不同设计参数对系统适用气候区域的影响,并验证了简化选择方法的适用性。数据集名称未明确提及,但实验基于理论模型和模拟结果。