Results 21 to 30 of about 822 (152)
Refrigerant R32 as lower GWP working fluid in residential air conditioning systems in Europe and the USA [PDF]
, 2017 Because air conditioning and heat pump systems contribute greatly to greenhouse gas emissions, equipment with both lower global warming potential (GWP) working fluids and a higher level of performance should be used.
Makhnatch, Pavel +3 more
core +2 more sources
Applied Sciences, 2022 A comparative analysis of the flow boiling characteristics of R450A, R515B, and R1234ze(E) inside a 7.0 mm OD microfin tube was performed. The mass velocity was explored from low values, starting from 50 kg m−2 s−1, up to 400 kg m−2 s−1, and the heat ...
Yuce Liu, Luisa Rossetto, Andrea Diani
doaj +1 more source
Combined Visualization and Heat Transfer Measurements for Steam Flow Condensation in Hydrophilic and Hydrophobic Mini-Gaps [PDF]
, 2016 Citation: Chen X, Derby MM. Combined Visualization and Heat Transfer Measurements for Steam Flow Condensation in Hydrophilic and Hydrophobic Mini-Gaps. ASME. J. Heat Transfer. 2016;138(9):091503-091503-11.
Chen, Xi, Derby, Melanie M.
core +1 more source
Vaporization inside a mini microfin tube: experimental results and modeling
Journal of Physics: Conference Series, 2015 This paper proposes a comparison among the common R134a and the extremely low GWP refrigerant R1234yf during vaporization inside a mini microfin tube. This microfin tube has an internal diameter of 2.4 mm, it has 40 fins, with a fin height of 0.12 mm.
DIANI, ANDREA, ROSSETTO, LUISA
openaire +2 more sources
A Comparative Study on the Condensation Heat Transfer of R-513A as an Alternative to R-134a
Machines, 2021 This paper presents the two-phase condensation heat transfer and pressure drop characteristics of R-513A as an alternative refrigerant to R-134a in a 9.52-mm OD horizontal microfin copper tube.
Andreas Karageorgis +2 more
doaj +1 more source
Journal of Thermodynamics, Volume 2016, Issue 1, 2016., 2016 Heat transfer, pressure loss, and thermal performance assessment in a circular tube heat exchanger with modified‐twisted tapes are reported. The rectangular holes are punched out from the general twisted tape to reduce the pressure loss. The influences of the hole sizes (l/D, LR = 0.30, 0.44, 0.78, and 0.88) and twisted ratios (y/D, TR = 1, 1.5, 2, and
Amnart Boonloi +2 more
wiley +1 more source
Flow regime based heat transfer correlation for R245fa in a 3 mm tube [PDF]
, 2018 241 heat transfer measurements for R254fa were conducted. The heat transfer coefficient was determined for a smooth stainless steel tube with an inner tube diameter of 3 mm. The experiments were conducted for five mass fluxes (100, 300, 500, 700 and 1000
Ameel, Bernd +4 more
core +3 more sources
Journal of Thermodynamics, Volume 2012, Issue 1, 2012., 2012 CFD investigation was carried out to study the heat transfer enhancement characteristics of air flow inside a circular tube with a partially decaying and partly swirl flow. Four combinations of tube with twisted‐tape inserts, the half‐length upstream twisted‐tape condition (HLUTT), the half‐length downstream twisted‐tape condition (HLDTT), the full ...
R. J. Yadav +2 more
wiley +1 more source
Frontiers in Energy Research, 2021 Despite of the large number of research dedicated to condensation heat transfer and pressure drop characteristics in pristine micro-fin tubes, experimental investigation on effects of tube expansion have not been reported in the open literature.
Na Liu, Qian Zhao, Zhixiang Lan
doaj +1 more source
Intensification of Heat Transfer Processes [PDF]
, 2015 New challenges in efficient heat recuperation arise when integrating renewables, polygeneration and combined heat and power (CHP) units with traditional sources of heat in industry and the communal sector, as it is shown by Klemeš et al. (2010).
Arsenyeva, O. P. +2 more
core +1 more source