Listar por tema "refrigeration"
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Desconexión entre la normativa vigente aplicable y las aulas en las titulaciones de grado. Estudio introductorio en dos universidades españolas
Autoeditado por Comité Congreso (2019)El cambio climático es una realidad y se debe concienciar a la sociedad desde todos los estamentos educativos con medidas eficaces para mitigar sus efectos. Desde el punto de vista de la ingeniería, los sistemas de ... -
Design of an environmentally friendly refrigeration laboratory based on cooling capacity calculation for graduate students
Ahmad Ibrahim (2018)Lower global warming potential (GWP) refrigerants must be used in refrigeration education to integrate the environmentally responsible engineering principles in class. However, most of the refrigeration educational ... -
Effect of mean void fraction correlations on a shell-and-tube evaporator dynamic model performance
Taylor and Francis (2015-08-22)In this article, the influence of different mean void fraction correlations on a shell-and-tube evaporator dynamic model performance has been evaluated. The model proposed is based on the moving-boundary approach and ... -
Experimental drop-in replacement of R404A for warm countries using the low GWP mixtures R454C and R455A
Elsevier (2018-05)This article presents an analysis of the feasibility of R454C and R455A, two new low global warming potential (GWP of 148) refrigerants, in vapor compression refrigeration systems as alternatives to R404A for warm countries. ... -
Experimental evaluation of alternative CO2-based blends for transcritical refrigeration systems
International Institute of Refrigeration (IIR) (2023-08-21)This work presents two refrigerant CO2 blends with R32 and R1270 designed with a theoretically nonflammability and a GWP below 150. Both mixtures were tested in a small-capacity vapour compression system with and without ... -
Experimental evaluation of zeotropic refrigerants in a dedicated mechanical subcooling system in a CO2 cycle
Elsevier Ltd. (2021-05-21)Use of zeotropic blends in the dedicated mechanical subcooling system of a CO2 refrigeration system was suggested as a possible improvement due to matching of evaporating temperature with CO2 temperature profile during ... -
Experimental influence of an internal heat exchanger (IHX) using R513A and R134a in a vapor compression system
Elsevier (2019-01-25)Coming refrigeration and air conditioning systems must include low GWP fluids and optimized components. An internal heat exchanger (IHX) is a common modification of the basic cycle to enhance its energy performance, and ... -
Experimental study of an R1234ze(E)/R134a mixture (R450A) as R134a replacement
Elsevier (2014-12-20)This work presents an experimental analysis of a non-flammable R1234ze(E)/R134a mixture (R450A) as R134a drop-in replacement. While R134a has a high GWP value (1430), the R450A GWP is only 547. The experimental tests are ... -
Predictions of European refrigerants place on the market following F-gas regulation restrictions
Elsevier (2021-03-10)The European Union (EU) Regulation on fluorinated greenhouse gases (F-gases) has encouraged to reduce gradually the number of hydrofluorocarbons (HFC) that can be placed on the market (POM) to 21% of the baseline level in ... -
Techno-economic analysis of a PV/T waste heat–driven compound ejector-heat pump for simultaneous data centre cooling and district heating using low global warming potential refrigerants
Springer Nature (2022-08-05)A comprehensive techno-economic evaluation is evaluated based on an innovative compound ejector-heat pump system with PV/T (photovoltaic thermal) waste heat-driven. The aim of the system is simultaneous data centre cooling ... -
Theoretical comparison of low GWP alternatives for different refrigeration configurations taking R404A as baseline
Elsevier (2014-04-25)Six refrigerants are evaluated as low GWP replacements for R404A using different configurations, including two-stage system architectures. These refrigerants are selected according to similar characteristics to R404A, and ... -
Theoretical energy performance evaluation of different single stage vapour compression refrigeration configurations using R1234yf and R1234ze(E) as working fluids
Elsevier (2014-05-10)R1234yf and R1234ze(E) have been proposed as alternatives for R134a in order to work with low GWP refrigerants, but this replacement results generally in a decrease of the performance. For this reason, it is interesting ... -
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 ...