Minimum ignition energies and laminar burning velocities of ammonia, HFO-1234yf, HFC-32 and their mixtures with carbon dioxide, HFC-125 and HFC-134a
نویسندگان
چکیده
Given the safety issues associated with flammability characteristics of alternative environmentally-friendly refrigerants, it is vital to establish measurement systems accurately analyse these mildly flammable refrigerants. In this study, we used a customised Hartmann bomb analogue measure minimum ignition energy (MIE) and laminar burning velocity (BV) for refrigerant/air mixtures pure ammonia (R717), R32, R1234yf R32 non-flammable refrigerants R134a, R125 carbon dioxide (R744). The MIEs R717, were measured at an ambient temperature 24 °C be (18.0 ± 1.4), (8.0 1.5) (510 130) mJ equivalence ratios 0.9, 1.27 1.33, respectively. Adding R744 along volumetric concentrations 5% each reduced latter compound’s increased its MIE by one order magnitude. velocities R717 ratio 1.1 using flat flame method found 8.4 7.4 cm/s, decreased 11%, while further addition resulted in decrease over 30% velocity.
منابع مشابه
Thermodynamic Properties of HFC-32/HFC-125 Mixtures and an Estimation of Its Environmental Impact and Utility in Refrigeration
A cubic equation of state for HFC-32/HFC-125 mixtures developed on the basis of our experimental data was used for thermodynamic analysis of refrigeration cycles using this blend. The influence of composition changes on energy efficiency and Total Equivalent Warming Impact (TEWI) was studied. Comparisons of this blend with HCFC-22 and other alternative refrigerants were also carried out. Detail...
متن کاملAzeotrope of HFC-125 and HFC-143a as an Alternative for R-502
R-502 has been the primary refrigerant for low temperature commercial refrigeration applications for many years. The impending phase-out of CFCs dictates its elimination in the very near future. The identification of alternative(s) for R-502 therefore becomes a high priority. This paper addresses the factors to be evaluated in selecting the best replacement and identifies an azeotropic mixture ...
متن کاملTheoretical Exergy Analysis of HFO-1234yf and HFO-1234ze as an Alternative Replacement of HFC-134a in Simple Vapour Compression Refrigeration System
An Exergy method for theoretical analysis of a traditional vapour-compression refrigeration system equipped with liquid vapour heat exchanger (lvhe) for HFO-1234yf (2, 3, 3, 3-Tetrafluoropropene) and HFO-1234ze (trans-1, 3, 3, 3-tetrafluoroprop-1-ene), both ultra low Global Warming Potential(GWP) and zero Ozone Depletion Potential(ODP) refrigerants and comparison of the results with HFC-134a re...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Hazardous Materials
سال: 2021
ISSN: ['1873-3336', '0304-3894']
DOI: https://doi.org/10.1016/j.jhazmat.2020.124781