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Refrigerant Charge Fault Detection and Diagnosis Algorithm for Water-to-Water Heat Pump Unit [PDF]
Energies, 2019 Refrigerant charge faults have a great adverse effect on the performance of heat pumps and must therefore be detected and diagnosed early in real time. In this study, the effect of refrigerant charge faults on a water-to-water heat pump is experimentally
Samuel Boahen +2 more
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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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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.
openaire +5 more sources
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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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 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 ($ \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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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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Quantum-circuit refrigerator [PDF]
Nature Communications, 2017 AbstractQuantum technology promises revolutionizing applications in information processing, communications, sensing and modelling. However, efficient on-demand cooling of the functional quantum degrees of freedom remains challenging in many solid-state implementations, such as superconducting circuits.
Partanen, Matti +6 more
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Improvements in CO2 Booster Architectures with Different Economizer Arrangements. [PDF]
, 2020 CO2 transcritical booster architectures are widely analyzed to be applied in centralized commercial refrigeration plants in consonance with the irrevocable phase-out of HFCs.
Cabello López, Ramón +5 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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