Air-side heat transfer and pressure drop characteristics of microchannel evaporators for household refrigerators

Boeng, Joel; Marcon, Arthur A.; Hermes, Christian J.L.

doi:10.1016/j.ijheatmasstransfer.2019.118913

Cited by 19 publications

(4 citation statements)

References 7 publications

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“…The air-side convective heat transfer coefficient α a and pressure drop ∆P a are defined by [29][30][31][32]:…”

Section: Microchannel Heat Exchanger Modelmentioning

confidence: 99%

Superhydrophobic Microchannel Heat Exchanger for Electric Vehicle Heat Pump Performance Enhancement

Sui,

Liang

et al. 2023

Sustainability

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Battery-powered electric vehicles (EVs) have emerged as an environmentally friendly and efficient alternative to traditional internal combustion engine vehicles, while their single-charge driving distances under cold conditions are significantly limited due to the high energy consumption of their heating systems. Heat pumps can provide an effective heating solution for EVs, but their coefficient of performance (COP) is hampered by heat transfer deterioration due to frost accumulation. This study proposes a solution to this issue by introducing a microchannel heat exchanger (MHE) with superhydrophobic surface treatment (SHST) as a heat pump evaporator. A computational fluid dynamics MHE model and a dynamic heat pump model are developed and rigorously validated to examine the detrimental impact of frost accumulation on heat transfer, airflow resistance, and heat pump performance. When the frost layer thickness is 0.8 mm at a given air-side velocity of 1.0 m/s, the air-side heat transfer coefficient can be reduced by about 75%, and the air-side pressure drop sharply increases by 28.4 times. As frost thickness increases from 0 to 0.8 mm, the heating capacity drops from 3.97 to 1.82 kW, and the system COP declines from 3.17 to 2.30. Experimental results show that the frost thickness of the MHE with SHST reaches approximately 0.4 mm after 30 min, compared to that of 0.8 mm of the MHE without SHST, illustrating the defrosting capability of the superhydrophobic coating. The study concludes by comparing the performance of various heating methods in EVs to highlight the advantages of SHST technology. As compared to traditional heat pumps, the heating power consumption of the proposed system is reduced by 48.7% due to the defrosting effect of the SHST. Moreover, the single-charge driving distance is extended to 327.27 km, an improvement of 8.99% over the heat pump without SHST.

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“…The air-side convective heat transfer coefficient α a and pressure drop ∆P a are defined by [29][30][31][32]:…”

Section: Microchannel Heat Exchanger Modelmentioning

confidence: 99%

Superhydrophobic Microchannel Heat Exchanger for Electric Vehicle Heat Pump Performance Enhancement

Sui,

Liang

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

“…The micro-channel heat exchanger has good potential and prospect in the application of refrigerator evaporator and condenser. BOENG [2] et al designed a new type of microchannel evaporator for household refrigerator. The performance of 16 kinds of prototype models with different geometric characteristics was evaluated by experiments, and the variation law of total thermal conductivity and air side pressure drop with wind speed was obtained.…”

Section: The Application Of Microchannel Heat Exchanger In Refrigeratormentioning

confidence: 99%

Review on Current Application of Microchannel Heat Exchanger

Guo

2023

AJST

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This paper considers various applications of heat exchangers in refrigerators, air conditioning, and nuclear power plants in recent years, current issues and trends, including the required capacity of refrigerator heat exchanger and the corresponding advantages of microchannel heat exchanger, refrigerator application of frost problems, ash problems and improve the performance of the relevant research; Examples of application of microchannel heat exchanger in air conditioning, comparison with traditional heat exchanger, and improvements to problems such as frost, the distribution of fluids, corrosion found in experiments; Study on advantages of compact microchannel heat exchanger in nuclear power plant. The purpose of this paper is to fill the gap in the application of microchannel heat exchanger and provide reference for future research.

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“…For instance, in water heater integrated dishwashers, heating of water in washing and drying phases should carefully be taken into consideration. In order to improve the energy efficiency of household appliances, many researchers presented promising techniques such as heat recovery through a heat exchanger [6], integration of open adsorption cycle in a dishwasher [7], and utilization of microchannel evaporator for refrigerators [8]. Since heat pump water heaters (HPWHs), which run on conventional refrigeration cycles, provide about 2.5 times more heating per electrical energy consumption compared to that of electrical resistance water heaters (ERWHs) [9], which are the viable technology for water heating, heat pump (HP) integrated technologies have been proposed owing to their superior energy efficiency for residential water and space heating [10e15] and household appliances [16e18].…”

Section: Introductionmentioning

confidence: 99%

Experiment-based optimization of an energy-efficient heat pump integrated water heater for household appliances

Kütük

Çetin

Bayer

2022

Energy

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Air-side heat transfer and pressure drop characteristics of microchannel evaporators for household refrigerators

Cited by 19 publications

References 7 publications

Superhydrophobic Microchannel Heat Exchanger for Electric Vehicle Heat Pump Performance Enhancement

Superhydrophobic Microchannel Heat Exchanger for Electric Vehicle Heat Pump Performance Enhancement

Review on Current Application of Microchannel Heat Exchanger

Experiment-based optimization of an energy-efficient heat pump integrated water heater for household appliances

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