Results 11 to 20 of about 5,916 (264)
Energies, 2021 The detection and diagnosis of faults is becoming necessary in ensuring energy savings in heat pump units. Faults can exist independently or simultaneously in heat pumps at the refrigerant side and secondary fluid flow loops. In this work, we discuss the
Samuel Boahen +4 more
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Energy Reports, 2021 The ignition delay is an important parameter which characterizes the initiation of combustion process and consequently its development in Diesel engines.
Lucian Miron +3 more
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Physical Review Letters, 2006 Onsager symmetry implies that a Brownian motor, driven by a temperature gradient, will also perform a refrigerator function upon loading. We analytically calculate the corresponding heat flux for an exactly solvable microscopic model and compare it with molecular dynamics simulations.
Van den Broeck, C., Kawai, R.
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Energies, 2022 Refrigerant maldistribution severely deteriorates the heat transfer performance of a microchannel evaporator. Compared with the refrigerant distribution among flat tubes along the header, refrigerant distribution among microchannels in the flat tube in ...
Wenju Hu, Xin Zhang
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Energies, 2023 R744 is the most competitive and ideal natural refrigerant when flammability and toxicity are strictly limited. However, there are still some problems when it is applied to a heating system.
Dahan Sun +3 more
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Physical Review E, 2010 We study a refrigerator model which consists of two $n$-level systems interacting via a pulsed external field. Each system couples to its own thermal bath at temperatures $T_h$ and $T_c$, respectively ($θ\equiv T_c/T_h<1$). The refrigerator functions in two steps: thermally isolated interaction between the systems driven by the external field and ...
Allahverdyan, Armen E. +2 more
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Alternative refrigerants and refrigeration cycles for domestic refrigerators [PDF]
, 1992 This project initially focused on using nonazeotropic refrigerant mixtures (NARMs) in a two-evaporator refrigerator-freezer design using two stages of liquid refrigerant subcooling. This concept was proposed and tested in 1975. The work suggested that the concept was 20% more efficient than the conventional one-evaporator refrigerator-freezer (RF ...
Sand, J. R. +2 more
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Wasit Journal of Engineering Sciences, 2014 Experimental investigation of vapor compression refrigeration system performance using Nano-refrigerant is presented in this work. Nano-refrigerant was prepared in current work by mixing 50 nanometers diameter of copper oxide CuO nanoparticles with
Ahmed J. Hamad
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Soot and smoke emissions numerical evaluation for a direct injection (DI) diesel engine
MATEC Web of Conferences, 2017 The reduction of Diesel internal combustion engines emissions is one of the major concerns of the engines manufacturers. Despite the fact that the efficiency of the gas post-treatment systems has been significantly improved, decreasing the smoke and the ...
Radu Bogdan +2 more
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A study on the use of dual mixed refrigerant in a cascade dual mixed refrigerant cycle
Advances in Mechanical Engineering, 2017 In this article, a precooling cycle was used to reduce the power consumption and improve the heat transfer efficiency of a mixed refrigerant cycle. Propane precooling and mixed refrigerant precooling are two common precooling methods.
Guo-guang Ma +3 more
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