Study on heat and mass transfer characteristics of humid air-flow in a fin bundle

Kim, Dong Hwi; Koyama, Shigeru; Kuwahara, Ken; Kwon, Jeong Tae; Park, Byung Duck

doi:10.1016/j.ijrefrig.2010.05.013

Cited by 5 publications

(1 citation statement)

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“…These factors can be classified into three categories: (1) environment conditions such as the outdoor fan characteristics and the temperature & humidity of the frontal airflow. Kim et al [2] used a slit fin bundle for the simulation of the heat exchanger in the air-source heat pumps (ASHPs) and experimentally explored the effects of cooling block temperature, air humidity and air velocity on its frosting characteristics. Zhang et al [3] carried out the comparative study on the airside performance under different outdoor air fan control modes of ASHPs experimentally.…”

Section: Introductionmentioning

confidence: 99%

Proposal, Robustness Analysis and Equivalent Implementation of Optimization Method for Row-by-Row Fin Distribution in Multi-Row Frosting Evaporator

Sun

Zhao

et al. 2021

Energies

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The evaporator in a frost-free refrigerator typically has more tube rows, but frost deposition reduces along the airflow direction. Correspondingly, the evaporator fin distribution is thinner in the upstream rows but denser downstream, and a good match between frost and fin distribution is achieved to recover evaporator capacity loss. However, quantitative design principles of non-uniform fin distribution are lacking. A quasi-static frosting evaporator model is established and experimentally verified considering a three-dimensional (3D) evaporator, 1D frost growth and 1D non-uniform fin distribution. An optimization method for row-by-row fin distribution of a multi-row frosting evaporator is proposed based on the air pressure drop’s increase rate. When the increase rate in the air pressure drop of each row is almost equal, the smallest overall evaporator pressure drop is obtained, leading to the highest air flowrate and the greatest evaporator capacity. By applying the method, the air flowrate and the evaporator capacity increase by 5.5% and 4.6%, respectively, compared to the original fin distribution scheme. Moreover, the robustness of the optimization method is validated under wide temperature and humidity operating conditions. An equivalent implementation under an initial no-frost condition is also proposed to facilitate the optimization method without calculating the whole frosting process.

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Section: Introductionmentioning

confidence: 99%