Frosting characteristics on hydrophobic and superhydrophobic surfaces: A review

Kim, Min-Hwan; Kim, Hisuk; Lee, Kwan-Soo; Kim, Dong Rip

doi:10.1016/j.enconman.2017.01.067

Cited by 129 publications

(33 citation statements)

References 82 publications

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“…In the runtime, the compressor and fan of the AHP are driven by the grid power, which transfers heat from the ambient air to the AHP. The AHP also requires periodical defrosting, which is influenced by the dew point of ambient air and freezing point of water [17 ]. The fan of the AHP is shut down when defrosting; so considering defrosting will render the results of the power consumption more accurate [18 ].…”

Section: Models Of the Heat Pump Heating System And Building Heat Loadmentioning

confidence: 99%

User-friendly rolling control strategy for a heat pump heating system considering building thermal inertia

Meng

et al. 2020

IET Energy Systems Integration

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Section: Models Of the Heat Pump Heating System And Building Heat Loadmentioning

confidence: 99%

User-friendly rolling control strategy for a heat pump heating system considering building thermal inertia

Meng

et al. 2020

IET Energy Systems Integration

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“…Such study helps to develop a more efficient way of removing condensates from fin surfaces [27][28][29][30]. For hydrophobic surface, the applications are, e.g., anti-icing surface [56][57][58][59][60], droplet impact on hydrophobic surface [61][62][63], microliter droplet evaporation [64][65][66], nanoliter droplet dispensers [67][68][69], droplet sliding behaviour on different surface roughness [70][71][72] and different surface structures [73][74][75]. The applications of superhydrophobic surface are similar to hydrophobic surface ones, e.g., anti-freezing [76][77][78], condenser/evaporator [78][79][80] and microfluidic valves [81][82][83].…”

Section: Different Hydrophobicity In Applicationsmentioning

confidence: 99%

Computational Modelling of Droplet Dynamics Behaviour in Polymer Electrolyte Membrane Fuel Cells: A Review

Yong

Ganesan

Kazi

et al. 2019

J. Electrochem. Sci. Technol

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Polymer Electrolyte Membrane Fuel Cells (PEMFC) is one of the leading advanced energy conversion technology for the use in transport. It generates water droplets through the catalytic processes and dispenses the water through the gas-flowed microchannels. The droplets in the dispensing microchannel experience g-forces from different directions during the operation in transport. Therefore, this paper reviews the computational modelling topics of droplet dynamics behaviour specifically for three categories, i.e. (i) the droplet sliding down a surface, (ii) the droplet moving in a gas-flowed microchannel, and (iii) the droplet jumping upon coalescence on superhydrophobic surface; in particular for the parameters like hydrophobicity surfaces, droplet sizes, numerical methods, channel sizes, wall conditions, popular references and boundary conditions.

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“…The heat is then transported to the evaporator of the water-source heat pump unit and subsequently released to generate high temperature heat for users such as buildings. The HTHP mitigates issues such as frost, which is prevalent in evaporators of conventional air-source heat pump systems, and the constraints of geological conditions present in water-source/geothermal heat pump systems (Kim et al, 2017;Liu et al, 2019aLiu et al, , 2019bWang et al, 2019;Xu et al, 2020). Therefore, HTHPs have attracted significant research attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

Effects of the operation parameters of a closed-type heating tower on the performance of heating tower heat pump system

Feng

Zhao

et al. 2020

Energy Exploration & Exploitation

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The ventilator of the heating tower and the circulating pump of the anti-freeze solution are the main electrical equipment of a heating tower heat pump system, besides the compressor. By controlling the working frequencies of the ventilator of the heating tower and circulating pump of the anti-freeze solution, the effects of the operation parameters of a closed-type heating tower on its heat absorption and the performance of heating tower heat pump system were investigated under winter heat conditions. The results indicated that reducing the frequency of the circulating pump for the anti-freeze solution leads to a decrease in the temperature of the outlet evaporator of the anti-freezing solution and an increased temperature difference between the anti-freeze solution flowing into and out of the heating tower; meanwhile, excessively high and low anti-freeze flow rates lead to reduced heat absorption of the closed-type heating tower. The coefficient of performance fluctuates slightly if the frequency of circulating pump is above 20 Hz, but a slight drop in coefficient of performance is observed when the frequency is less than 15 Hz. The system energy efficiency ratio tends to increase as the frequency of circulating pump is reduced, although a substantial reduction occurs at 10 Hz. Furthermore, a reduced ventilator frequency decreases the temperatures of the anti-freeze solution at the inlet and outlet of the heating tower and the temperature difference, hindering the heat absorption of the heating tower. With reductions in the ventilator frequency, the coefficient of performance exhibits an initial increase followed by subsequent decreases, while the system energy efficiency ratio showed continual increases until the ventilator frequency dropped to 10 Hz. When the ventilator frequency or circulating pump frequency drops to 15 Hz and 10 Hz, the evaporation temperature of the heat pump unit decreases, resulting in an excessively exhaust temperature, which is not favorable for the safe operation of the system.

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Frosting characteristics on hydrophobic and superhydrophobic surfaces: A review

Cited by 129 publications

References 82 publications

User-friendly rolling control strategy for a heat pump heating system considering building thermal inertia

User-friendly rolling control strategy for a heat pump heating system considering building thermal inertia

Computational Modelling of Droplet Dynamics Behaviour in Polymer Electrolyte Membrane Fuel Cells: A Review

Effects of the operation parameters of a closed-type heating tower on the performance of heating tower heat pump system

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