Frost formation and anti-icing performance of a hydrophobic coating on aluminum

Wang, Zuo-Jia; Kwon, Dong-Jun; DeVries, K. Lawrence; Park, Joung-Man

doi:10.1016/j.expthermflusci.2014.09.003

Cited by 92 publications

(30 citation statements)

References 31 publications

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“…To promote the rapid development of ASHP technology and the successful implementation of Coal to Electricity policy in China, the anti-frosting and defrosting technologies are focused by researchers worldwide in recent years [14]. According to the references, the anti-frosting technologies include changing the characteristics (temperature, velocity [20], humidity [21], pressure [22] and purified air [23]) of inlet ambient air, changing the cold surface temperature [24], surface treatment [25], changing the structure of air heat exchanger (fin-tube geometry [26][27][28], fin spacing [29,30], fin type [31,32]), changing the interaction between air or frost layer and cold surface (electric field [33], ultrasonic wave [34], magnetic field [35] and low frequency mechanical oscillation [36]). And the defrosting technologies mainly have reverse cycle [37], hot gas bypass [38], electrical heating [19,39,40], warm-air defrosting [41], compressor shutdown [42], hot water spray [43], phase change heat storage, electric field [44], ultrasonic wave [45], magnetic field [46], air-particle jet [47], control strategy [48] and waste heat recovery [49,50].…”

Section: Introductionmentioning

confidence: 99%

Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review

Zhang

Zhang³

et al. 2018

Energies

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Frost layer on the outdoor air heat exchanger surface in an air-source heat pump (ASHP) can decrease the system coefficient of performance (COP). Although the common defrosting and anti-frosting methods can improve the COP, the periodic defrosting not only reduces the system energy efficiency but also deteriorates the indoor environment. To solve these problems, it is necessary to clearly understand the frosting phenomenon and to achieve the system frost-free operation. This paper focused firstly on the analyses of frosting pathways and frosting maps. Followed by summarizing the characteristics of frost-free technologies. And then the performances of two types of frost-free ASHP (FFASHP) systems were reviewed, and the exergy and economic analysis of a FFASHP heating system were carried out. Finally, the existing problems related to the FFASHP technologies were proposed. Results show that the existing frosting maps need to be further improved. The FFASHP systems can not only achieve continuous frost-free operation but reduce operating cost. And the total COP of the FFASHP heating system is approximately 30–64% higher than that of the conventional ASHP system under the same frosting conditions. However, the investment cost of the FFASHP system increases, and its reliability also needs further field test in a wider frosting environment. In the future, combined with a new frosting map, the control strategy for the FFASHP system should be optimized.

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Section: Introductionmentioning

confidence: 99%

Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review

Zhang

Zhang³

et al. 2018

Energies

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“…Coatings 2017, 7,158 temperature, and oxidative decomposition only commences above 400 °C according to thermogravimetric analysis [33]. The material's structural and chemical stability make graphene suitable for deicing applications.…”

Section: Graphene Coating Characterizationsmentioning

confidence: 99%

“…Surface coatings with anti-/deicing properties are being explored as passive methods to prevent water droplets from icing on the anti-icing surface or to reduce the adhesion force between the ice and deicing surface. A series of materials, such as carbon-based material [4][5][6], liquid-infused material [7][8][9], and nanocomposites [10][11][12], exhibit anti-icing functions. Most of these materials are suitable for anti-icing in a limited number of icing conditions, while the effect is not ideal under moderate icing conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Graphene Coating on the Heat Transfer Performance of a Composite Anti-/Deicing Component

Chen

Zhang

2017

Coatings

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Abstract:The thermal conductivity of a graphene coating for anti-/deicing is rarely studied. This paper presents an improved anti-/deicing efficiency method for composite material anti-/deicing by using the heat-transfer characteristic of a graphene coating. An anti-/deicing experiment was conducted using the centrifugal force generated by a helicopter rotor. Results showed that the graphene coating can accelerate the internal heat transfer of the composite material, thereby improving the anti-icing and deicing efficiency of the helicopter rotor. The spraying process parameters, such as coating thickness and spraying pressure, were also studied. Results showed that reducing coating thickness and increasing spraying pressure are beneficial in preparing a graphene coating with high thermal conductivity. This study provides an experimental reference for the application of a graphene coating in anti-/deicing.

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“…Too many ambient factors are involved in ice formation including air pressure, air velocity, wind direction, air humidity, and so on. 11 All of these environmental conditions are naturally present, which can fundamentally complicate the ice scenario. Exploring anti-icing/icing mechanism has become even more challenging due to the complexity of the icing issues.…”

Section: Introductionmentioning

confidence: 99%

“…Water vapor (air humidity) can play a crucial role in wettability and anti-icing properties. 11,15 When the temperature drops below zero, moisture in the surrounding air condenses and freezes, adhering to the cold surfaces. There are lots of open questions about humidity in icing issues.…”

Section: Introductionmentioning

confidence: 99%

The impact of high humidity on the ice-phobicity of copper-based superhydrophobic surfaces

Zheng

Shafack

Walker

et al. 2017

Nanomaterials and Nanotechnology

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Humidity, as an important meteorological factor, has rarely been taken into account as far as the ice-phobicity research is concerned. For the first time, the ice-phobicity of a silver-modified copper surface with 1-dodecanethiol coating was investigated in an environment with 69% humidity. It turns out that high humidity has no impact on the superhydrophobicity of the surface at the room temperature. However, humidity compromises the water repellency by decreasing the contact angle from 156 + 2 to 116 + 2 when the temperature reaches zero. By further lowering the temperature, the robust ice-phobicity is observed on the superhydrophobically coated surface. In conjunction with the favorable topological configuration and in high humid surroundings, the intrinsic wettability of the superhydrophobic surfaces dramatically delays the freezing process for 120 s.

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Frost formation and anti-icing performance of a hydrophobic coating on aluminum

Cited by 92 publications

References 31 publications

Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review

Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review

Effect of Graphene Coating on the Heat Transfer Performance of a Composite Anti-/Deicing Component

The impact of high humidity on the ice-phobicity of copper-based superhydrophobic surfaces

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