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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
Energies, 2023 Organic Rankine cycles (ORCs) have been widely used to convert medium-low-temperature geothermal energy to electricity. Proper cycle layout is generally determined by considering both the thermo-physical properties of the working fluid and the geothermal
Qiang Liu +3 more
doaj +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
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
Energy Science &Engineering, Volume 11, Issue 2, Page 527-546, February 2023., 2023 A parametric study using advanced exergetic analysis was performed for the system. Endogenous, exogenous, avoidable, and unavoidable irreversibilities were determined. Avoidable exergy destruction in the system is more sensitive to absorber temperature.
Arman Zendehnam, Fathollah Pourfayaz
wiley +1 more source
Theoretical analysis of a Low GWP Refrigerants as a Drop in substitute of R134a in a Domestic Refrigerator [PDF]
Iranica Journal of Energy and Environment, 2018 Now a days Fridges and Air-conditioners are mostly used in domestic environment. The CFCs have been almost ruled out since 1995 due to their huge impact on the ozone layer, due to the above problem HFC refrigerants are introduced but these are having a ...
M. Shaik Sk, K. Srinivas
doaj +1 more source
International Journal of Energy Research, Volume 2023, Issue 1, 2023., 2023 The flow boiling heat transfer performance of R22 and R407c, in a microfin tube with a helix angle of 22° and an apex angle of 48°, was evaluated in a study. The study is aimed at investigating the impact of heat flux, mass flux, saturation temperature, and vapor quality on the heat transfer coefficient during flow boiling.
Sandipan Deb +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
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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
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