Energy-saving of air-cooling heat exchangers operating under wet conditions with the help of superhydrophobic coating

Muneeshwaran, M.; Wang, Chi-Chuan

doi:10.1016/j.enconman.2020.113740

Cited by 18 publications

(4 citation statements)

References 33 publications

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“…In addition, superhydrophobic coating can reduce the airside pressure drop of the rectangular plain heat exchangers. M. Muneeshwaran showed that the superhydrophobic coating led to appreciable energy saving of 30%–60% at higher relative humidities (70% or 90%) 14 . However, this superhydrophobic coating showed shorter freezing delay, resulting in a shorter defrosting cycle, thus increasing the heat exchanger's energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Preparation of superhydrophobic asymmetric vitrimer coating with high porosity and the key role of hierarchical pocket structure on long freeze delay time and high durability

Xiong,

Zhang,

Liu

et al. 2024

Polymers for Advanced Techs

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It is still a big challenge to prepare superhydrophobic anti‐icing coatings with long freeze delay performance and high durability. In this work, in different with conventional flexible porous coating, we prepared an asymmetric coating with hierarchical pocket structure by a facile hot‐pressing/salt‐leaching (BHS) method on a polyacrylate vitrimer polymer with mellability. The asymmetric architecture endowed porous coating with low density and high adhesion strength. The in‐situ growth of silica nanoparticles in above porous coating and surface modification generated a superhydrophobic hierarchical pocket structure. As a result, the freezing delay time was drastically increased to 14,400 s at −10°C. Furthermore, owing to hierarchical pocket structure, the coating could maintain its superhydrophobicity and anti‐icing performance under water flow impacting at 10 kPa pressure, 30 cycles of sandpaper abrasion, 50 cycles of tape peeling, showing advantageous high durability. By employing the hierarchical porous coating on heat exchangers, the energy consumption was drastically reduced by 93%.

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Section: Introductionmentioning

confidence: 99%

Preparation of superhydrophobic asymmetric vitrimer coating with high porosity and the key role of hierarchical pocket structure on long freeze delay time and high durability

Xiong,

Zhang,

Liu

et al. 2024

Polymers for Advanced Techs

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“…In this way, the pumping power and energy requirement of the system are reduced, while the thermal performance of the HE is increased. 4,5 Hydrophobic coatings, a product of nanotechnology, are used in many areas in industry. As with many technologies, hydrophobic coatings have been developed with inspiration from nature.…”

Section: Introductionmentioning

confidence: 99%

“…In this way, the pumping power and energy requirement of the system are reduced, while the thermal performance of the HE is increased. 4,5…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the effect of hydrophobic coating on heat transfer and gasketed plate heat exchanger performance

Dağlı

Özbey

2023

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this study, the effect of hydrophobicity on the plate surface on heat transfer, pressure drop, and pump power was investigated without changing the existing designs of gasketed plate heat exchangers (GPHEs). The wet surfaces of the plate were coated with carbon-based polymer solutions with four different hydrophobic groups, that is, FEP, FH3, FH7, and FH10. To increase the hydrophobicity of the FEP material, a new coating solution was synthesized by adding 3, 7, and 10 wt.% h-BN nanoparticles. Heat transfer, pressure loss, and pump power performances of heat exchangers with hydrophobic surface coating were tested at five different Reynolds numbers and compared with the uncoated heat exchanger performance. Also, the efficiency analysis of the GPHE under different hydrophobic conditions was carried out. As a result, the addition of 3 and 7 wt.% h-BN nanoparticles increased the contact angle. However, the addition of 10 wt.% h-BN decreased the contact angle as it increased the rough structure and film thickness on the surface. It was determined that the heat exchanger efficiency increased proportionally with the increase in hydrophobicity. While the highest heat exchanger efficiency value was 0.525 in FH7 coated. However, it was found that there was a 25.6% decrease in heat transfer of FH7 coating compared to uncoated exchanger. The pressure drop of the FH7 surface-coated heat exchanger with the highest hydrophobicity was 207.6% lower than that of uncoated heat exchanger. Energy savings of approximately 41% were achieved in FH7 coated compared to uncoated heat exchangers. It has been emphasized that heat transfer in GPHE systems should be evaluated together with pressure drops and local losses. It was found that the use of hydrophobic surface coating on plates in heat exchangers will contribute to the development of heat exchanger designs, reducing pump costs, and energy consumption.

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“…For most heating systems, energy waste mainly arises from inefficient operations of boilers, low efficiency of pipe transmission, and poor quality of heat supply. Therefore, it is of high necessity to analyze the energy consumption of the heating system, and reconstruct the system for better energy efficiency [24][25][26][27][28]. This paper researches and evaluates the energy-saving reconstruction of intelligent community heating (ICH) system based on IoT.…”

Section: Introductionmentioning

confidence: 99%

Research and Evaluation of Energy-Saving Reconstruction of Intelligent Community Heating System Based on the Internet of Things

Sun¹,

Chen²,

Pan³

et al. 2021

IJHT

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At this critical junction of industrialization, China is facing an increasingly prominent imbalance between energy supply and demand. It is of great social significance to study the energy-saving of buildings that consume a huge amount of energy. For most heating systems, energy waste mainly arises from inefficient operations of boilers, low efficiency of pipe transmission, and poor quality of heat supply. This paper researches and evaluates the energy-saving reconstruction of intelligent community heating (ICH) system based on the Internet of things (IoT). Firstly, the energy-saving reconstruction of the ICH system was analyzed, and a hydraulic regime model was derived from the simplified model of the water supply and return pipe networks. Then, the system pipe network was investigated in three aspects, namely, node flow balance, pipeline pressure drop balance, and loop pressure drop balance. On this basis, the authors presented the balance equation and finalized the hydraulic regime model of the system. After that, the energy consumption of the system was evaluated before and after the reconstruction, and the energy-saving benefit was predicted. The effectiveness of the proposed method was proved through experiments.

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Energy-saving of air-cooling heat exchangers operating under wet conditions with the help of superhydrophobic coating

Cited by 18 publications

References 33 publications

Preparation of superhydrophobic asymmetric vitrimer coating with high porosity and the key role of hierarchical pocket structure on long freeze delay time and high durability

Preparation of superhydrophobic asymmetric vitrimer coating with high porosity and the key role of hierarchical pocket structure on long freeze delay time and high durability

Experimental investigation of the effect of hydrophobic coating on heat transfer and gasketed plate heat exchanger performance

Research and Evaluation of Energy-Saving Reconstruction of Intelligent Community Heating System Based on the Internet of Things

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