Buscar
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 ...
Repair vs. replacement: Selection of the best end-of-life scenario for small household electric and electronic equipment based on life cycle assessment
(Elsevier, 2019-11-28)
This study presents a methodology designed for selecting, from an environmental point of view, the best end-of-life scenario for electric and electronic equipment which breaks before the end of its life span. To this end, ...
Environmental impact assessment of R-152a as a drop-in replacement of R-134a in a domestic refrigerator
(Elsevier, 2020-05-23)
In the European Union F-gas Regulation limited the use of some refrigerants in several applications. Regarding the domestic refrigeration sector, the F-gas Regulation banned the use of refrigerants with GWP values higher ...
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 ...
Dynamic model of a shell-and-tube condenser. Analysis of the mean void fraction correlation influence on the model performance
(Elsevier, 2013)
A moving-boundary dynamic model of a shell-and-tube condenser is presented. Within this approach, the mean void fraction is a relevant parameter which is obtained, in this work, using different correlations proposed in the ...
Energy influence of the IHX with R22 drop-in and long-term substitutes in refrigeration plants
(Elsevier, 2013-01-10)
This work focuses on the investigation of new drop-in or long-term refrigerants for low evaporating temperatures that can be used as substitutes for HCFC-22, which is gradually being phased-out. This process is already in ...
Influence of material and diameter of pre-fabricated posts on maxillary central incisors restored with crown
(Wiley, 2009)
Numerous research works have studied the effect of post-design parameters on the mechanical behaviour of restored teeth without reaching any clear conclusions. Previous works by the authors ascertained the effect of material ...
Influence of the particle size on the microstructure and mechanical properties of grains containing mixtures of nanoparticles and microparticles: Levitator tests and pilot-scaled validation
(Elsevier, 2013)
The spray drying process is used in many industrial applications. However, different grain properties can be desirable depending on the later use of the powders produced. In this work the influence of the particle size on ...
Near-intrinsic energy resolution for 30–662 keV gamma rays in a high pressure xenon electroluminescent TPC
(Elsevier, 2013)
We present the design, data and results from the NEXT prototype for Double Beta and Dark Matter (NEXT-DBDM) detector, a high-pressure gaseous natural xenon electroluminescent time projection chamber (TPC) that was built ...