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Upward vertical two-phase flow local flow regime identification using neural network techniques
(Elsevier, 2008)
Traditionally, the flow regimes in two-phase flow are considered in a global sense. However, a local flow regime is required to understand and model the interfacial structures present in the flow. In this work, a new ...
Design of a model to assess the environmental risk of leachate dams
(Elsevier, 2008)
Leachate dams store very toxic liquids, leachate, that contain a large amount of pollutant substances. Most of them are located in gullies or ravines, so if a dam breaks, leachate would advance downstream provoking an ...
Environmental risk index: A tool to assess the safety of dams for leachate
(Elsevier, 2009)
Dams for leachate store very toxic substances that contain a large amount of organic material and, probably, heavy metals; they therefore constitute an important threat to the environment. Existing models of environmental ...
Energy perfomance evaluation of R1234YF, R1234ze (E), R6600a, R290 and R152a as low-GWP R134a alternatives
(Elsevier, 2017-02)
In 2014, the Directive 517/2014 was introduced by European Parliament to reduce the use of high-GWP greenhouse gases in the European area in order to limit global climate change in accordance with the objectives marked by ...
Thermoeconomic analysis of CO2 Ejector-Expansion Refrigeration Cycle (EERC) for low-temperature refrigeration in warm climates
(Elsevier, 2021-04)
Refrigeration industry is adopting a proactive strategy to phase out fluorinated greenhouse gases by more sustainable working fluids. R744 is a natural refrigerant widely proposed for commercial refrigeration. Its use in ...
Thermodynamic analysis of the optimal operating conditions for a two-stage CO2 refrigeration unit in warm climates with and without ejector
(Elsevier, 2021-02-25)
The natural refrigerant R744 seems to be the long term solution to be imposed in the food retail industry, where low and medium refrigeration temperatures are usually required, despite the technical difficulties related ...
Bottoming organic Rankine cycle configurations to increase Internal Combustion Engines power output from cooling water waste heat recovery
(Elsevier, 2013-11-03)
This work is focused on waste heat recovery of jacket cooling water from Internal Combustion Engines (ICEs). Cooling water heat does not always find use due to its low temperature, typically around 90 °C, and usually is ...
Comparative study of transcritical vapor compression configurations using CO2 as refrigeration mode base on simulation
(Elsevier, 2013-03)
Despite of the excellent efficiency of the CO2 transcritical cycle in heat pump mode, there is a loss of efficiency in refrigeration mode compared with the subcritical vapor compression cycle with HFC refrigerants. This ...
Free vibrations of simply-supported beam bridges under moving loads: Maximum resonance, cancellation and resonant vertical acceleration
(Elsevier, 2013)
The advent of high-speed railways has raised many concerns regarding the behaviour of bridges. Particularly, the analysis of the free vibrations generated by each load is of great interest because they can possibly accumulate ...
Influence of ultra-high strength infill in slender concrete-filled steel tubular columns
(Elsevier, 2013-07)
This paper describes 24 tests conducted on slender circular tubular columns filled with normal, high, and ultra-high strength concrete for plain, bar reinforced and steel fiber reinforced columns. These were reinforced and ...