Investigation of air cooler fan start-up delay in liquid refrigerant defrosting system

Wang, Meng; Zang, Runqing; Hu, Eric; Ezzat, Akram W.

doi:10.1016/j.applthermaleng.2018.07.066

Cited by 13 publications

(2 citation statements)

References 20 publications

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“…The optimal defrost cycle is based on the basic complete defrost, while the residual frost at the edges where the heat exchange is small can be neglected. In addition, Wang et al (2018) introduced the method of refrigerant subcooling defrosting, which is similar to the hot gas bypass method and uses the refrigerant liquid just coming out from the condenser to the evaporator for defrosting; the characteristics of this method are similar to those of the hot gas bypass method, which does not affect the heating, but requires a long operation time and is suitable for defrosting out the frost in the case of microfrost to prevent further frost generation. The condenser has the following advantages over conventional hot air corps: First, it has low system operating costs.…”

Section: Traditional Solutionsmentioning

confidence: 99%

Intelligent control system for the electric vehicle heat pump air conditioner based on machine learning

Ze-hua

2023

Front. Energy Res.

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In order to break through the existing battery technology of electric vehicles, this paper proposes to use heat pump air conditioning instead of the original PTC heating system potential. First, the advantages and disadvantages of different heat pump models for new energy vehicles are analyzed and compared. Second, a fuzzy inference system is constructed based on the machine learning model to observe the temperature of the passenger compartment using the temperature sensor inside the tram and to determine the need for the air conditioning system to be turned on in the heating/cooling mode by comparing it with the set temperature. Finally, the results show that the machine learning algorithm is able to monitor and adaptively adjust the interior temperature to further enhance the adaptability of the system with low volatility and high accuracy. The proposed research study can lay the foundation for further optimizing the design of heat pump air conditioners for electric vehicles.

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Section: Traditional Solutionsmentioning

confidence: 99%

Intelligent control system for the electric vehicle heat pump air conditioner based on machine learning

Ze-hua

2023

Front. Energy Res.

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“…The frost layer will block the air flow between the fin pipes, resulting in the deterioration of the heat transfer performance of the condenser. The COP of the system will be reduced [2]. In order to ensure the stability of heating operation, the condenser needs to be defrosted periodically [3].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Current Control Defrosting Method of Multi-split Variable Refrigerant Flow System

Liu¹,

Liu²,

Wang³

et al. 2020

International Journal of Thermodynamics

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There are many indoor units in the multi-split variable refrigerant flow (VRF) system. The continuous operation of heating in winter is longer than that of ordinary household air conditioning, so that the precise defrosting control is energy-saving and improves the comfort for users. In this paper, during the experiment, the indoor temperature was 20℃, the outdoor dry bulb temperature was 7℃, 0℃,-5℃ and-7℃, and the wet bulb temperature was 6℃, 0℃,-6 ℃ and-8℃ respectively. The defrosting temperature, liquid pipe temperature, defrosting time and the current value change rate of the condenser fan were compared when the heating capacity was reduced by 15%. The experiments showed that the current change rate was only related to the frost mass rather than the outdoor temperature. The best fan current change rate was 15%-20% when to defrost for the VRF system. Compared with the traditional defrosting, the phenomenon of thermosensor falling off and the uneven frost formation had little impact on the current control defrosting.

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Experimental study on electronic expansion valve failure of a R290 room air conditioner during heating-defrosting process

Che

et al. 2019

Applied Thermal Engineering

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Investigation of air cooler fan start-up delay in liquid refrigerant defrosting system

Cited by 13 publications

References 20 publications

Intelligent control system for the electric vehicle heat pump air conditioner based on machine learning

Intelligent control system for the electric vehicle heat pump air conditioner based on machine learning

Investigation on Current Control Defrosting Method of Multi-split Variable Refrigerant Flow System

Experimental study on electronic expansion valve failure of a R290 room air conditioner during heating-defrosting process

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