Results 1 to 10 of about 28,453 (289)

Fault Detection Algorithm for Multiple-Simultaneous Refrigerant Charge and Secondary Fluid Flow Rate Faults in Heat Pumps

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, Kwesi Mensah, Selorm Kwaku Anka, Kwang Ho Lee, Jong Min Choi   +4 more
doaj   +1 more source

Study on the Coupling Effect of Heat Transfer and Refrigerant Distribution in the Flat Tube of a Microchannel Evaporator

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
doaj   +1 more source

Ignition delay and its influence on the performance of a Diesel engine operating with different Diesel–biodiesel fuels

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, Radu Chiriac, Marek Brabec, Viorel Bădescu   +3 more
doaj   +1 more source

Comparative Study on Boiling Heat Transfer Characteristics and Performance of Low-Temperature Heating System of R744 and Its Azeotropic Refrigerant

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, Xin Zhang, Zhongyan Liu, Hao Zhang   +3 more
doaj   +1 more source

Experimental Investigation of Vapor Compression Refrigeration System Performance Using Nano-Refrigerant

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
doaj   +1 more source

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, Racovitza Alexandru, Chiriac Radu   +2 more
doaj   +1 more source

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, Chen Zhang, Yi-ran Ding, Bo-cheng Li   +3 more
doaj   +1 more source

Carbon Emission Assessment and Economic Analysis of Refrigerant Recycling

Zhileng xuebao, 2021
China has entered the end of the hydrochlorofluorocarbon (HCFCs) refrigerant phase out, and will soon start to reduce its production and consumption of HFCs simultaneously in 2024.
Wang Yue, Mi Hong, Xu Hong, Zang Jianbin, Wang Haiying   +4 more
doaj  

Experimental Investigation on VCR system using Nano-refrigerant for COP Enhancement

Chemical Engineering Transactions, 2018
Nano fluids have high heat transfer potential, increased thermal properties in comparison with conventional working fluids which increases the Co-efficient of performance of the refrigeration system.
Raghu Ande, Ram S.R. Koppala, Manzoor Hadi   +2 more
doaj   +1 more source

Performance Evaluation of Centrifugal Refrigeration Compressor Using R1234yf and R1234ze(E) as Drop-In Replacements for R134a Refrigerant

Energies, 2022
With the increasing global requirements for environmental protection, refrigerants with ODP of 0 and low GWP are widely concerned and applied. In this paper, the CFD numerical method simulates the R134a centrifugal compressor directly replaced by R1234yf
Kexin Yi, Yuanyang Zhao, Guangbin Liu, Qichao Yang, Guoxin Yu, Liansheng Li   +5 more
doaj   +1 more source