Retarding frosting of an air source heat pump by using vapor-bypassed evaporation technique

Fan, Chaochao; Xiong, Tong; Yan, Gang; Yu, Jianlin; Zhang, Hao; Chu, Woei Chyn; Wang, Qiuwang

doi:10.1016/j.ijrefrig.2021.03.014

Cited by 9 publications

(1 citation statement)

References 24 publications

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“…It not only has high energy efficiency, but also reduces heating energy consumption and environmental pollution. However, severe frosting occurs on the evaporator side resulting from the strong cold air in the north [ 7 ], which not only increases the heat transfer resistance of the evaporator, but also increases the wind resistance of the heat exchanger. As a result, the evaporation temperature and condensation temperature decrease, and heating capacity and the energy efficiency ratio decline [ 8 ], severely restricting the promotion of air source heat pumps in different regions [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis on frosting of heat exchanger and numerical simulation of heat transfer characteristics using BP neural network learning algorithm

Yu¹,

Luo²,

Chu

2021

PLoS ONE

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The study is aimed at the frosting problem of the air source heat pump in the low temperature and high humidity environment, which reduces the service life of the system. First, the frosting characteristics at the evaporator side of the air source heat pump system are analyzed. Then, a new defrost technology is proposed, and dimensional theory and neural network are combined to predict the transfer performance of the new system. Finally, an adaptive network control algorithm is proposed to predict the frosting amount. This algorithm optimizes the traditional neural network algorithm control process, and it is more flexible, objective, and reliable in the selection of the hidden layer, the acquisition of the optimal function, and the selection of the corresponding learning rate. Through model performance, regression analysis, and heat transfer characteristics simulation, the effectiveness of this method is further confirmed. It is found that, the new air source heat pump defrost system can provide auxiliary heat, effectively regulating the temperature and humidity. The mean square error is 0.019827, and the heat pump can operate efficiently under frosting conditions. The defrost system is easy to operate, and facilitates manufactures designing for different regions under different conditions. This research provides reference for energy conservation, emission reduction, and sustainable economic development.

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Section: Introductionmentioning

confidence: 99%