Results 21 to 30 of about 2,942 (221)
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 +5 more
doaj +1 more source
A regenerative supercritical-subcritical dual-loop organic Rankine cycle system for energy recovery from the waste heat of internal combustion engines [PDF]
, 2017 Organic Rankine cycle (ORC) system is considered as a promising technology for energy recovery from the waste heat rejected by internal combustion (IC) engines.
Wang, Enhua +3 more
core +1 more source
Simulation of Compression Heat Pump Cycles Using NH3/H2O Mixtures to Estimate Their Working Domains
Chemie Ingenieur Technik, Volume 95, Issue 3, Page 405-415, March 2023., 2023 The working domain of different NH3/H2O heat pump cycles is investigated to provide temperatures up to 150 °C. An algorithm is developed, which maximizes coefficient of performance and volumetric heat capacity and minimizes compressor discharge temperature for given external temperatures and internal pressure limits.
Maximilian Loth, Stephan Kabelac
wiley +1 more source
Energy Technology, Volume 11, Issue 2, February 2023., 2023 The interdependencies of the refrigerant, flowsheet, compressor, and operating point are evaluated for residential heat pumps. The study shows that the optimal refrigerant strongly depends on the flowsheet and the compressor modeling approach.
Christoph Höges +5 more
wiley +1 more source
Neural networks for small scale ORC optimization [PDF]
, 2017 This study concerns a thermodynamic and technical optimization of a small scale Organic Rankine Cycle system for waste heat recovery applications. An Artificial Neural Network (ANN) has been used to develop a thermodynamic model to be used for the ...
Massimiani, Alessandro +3 more
core +1 more source
P-V-T Behavior of 2,3,3,3-Tetrafluoroprop-1-ene (HFO-1234yf) in the Vapor Phase from (243 to 373) K [PDF]
, 2010 The P-V-T properties of 2,3,3,3-tetrafluoroprop-1-ene (CF 3 CFdCH 2 , HFO-1234yf), an environmentally friendly refrigerant, were measured using a constant volume apparatus.
Di Nicola, Cristiano +4 more
core +1 more source
Zhileng xuebao, 2023 In heat pumps, the use of environmentally friendly refrigerants can reduce damage to the ozone layer. Under the condition of low ambient temperature, based on the existing heat pump system, the CO2 transcritical cycle and mechanical subcooling were ...
Zhang Ning +7 more
doaj
Performance of an oil-free linear compressor using R1234yf [PDF]
, 2018 As an alternative to the hydrocarbons (HCs), R1234yf synthetic refrigerant from the family of the hydrofluoroolefins (HFOs), has emerged recently as a replacement fluid for R134a. The purpose of this study is to investigate the performance of an oil-free
Li, Zhaohua, Liang, Kun
core +1 more source
Journal of Engineering, 2019 Reducing global warming potential (GWP) of refrigerants is needed to the decrease of ozone-depleting of refrigeration systems leakages. Refrigerant R1234yf is now used to substitute R134a inside mobile air conditioning systems.
Rafah Hussain, Issam Mohammed ali
doaj +1 more source
Optimisation of a high-efficiency solar-driven organic rankine cycle for applications in the built environment [PDF]
, 2018 Energy security, pollution and sustainability are major challenges presently facing the international community, in response to which increasing quantities of renewable energy are to be generated in the urban environment.
Chatzopoulou, Maria Anna +2 more
core +2 more sources