Listar por tema "Refrigeration"
Mostrando ítems 1-10 de 10
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A comparison between the modeling of a reciprocating compressor using artificial neural network and physical model
Elsevier (2015)This article presents the development, validation, and comparison of two methods for modeling a reciprocating compressor. Initially, the physical mode is based on eight internal sub-processes that incorporate infinitesimal ... -
A dynamic model of a shell-and-tube condenser operating in a vapour compression refrigeration plant
Elsevier (2008)This work presents a mathematical model of a shell-and-tube condenser based on mass continuity, energy conservation and heat transfer physical fundamentals, whose methodology can be easily adapted for modelling any type ... -
Analysis based on EU Regulation No 517/2014 of new HFC/HFO mixtures as alternatives of high GWP refrigerants in refrigeration and HVAC systems
Elsevier (2015)The EU Regulation No 517/2014 is going to phase-out most of the refrigerants commonly used in refrigeration and air conditioning systems (R134a, R404A and R410A) because of their extended use and their high GWP values. ... -
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 ... -
Drop-in analysis of an internal heat exchanger in a vapour compression system using R1234ze(E) and R450A as alternatives for R134a
Elsevier (2015-10)The IHX (internal heat exchanger) is introduced in some refrigeration systems in order to achieve higher energy performances. Results obtained vary greatly depending on the refrigerant used and working conditions. 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 ... -
Experimental evaluation of different refrigeration system configurations using CO2-based blends as refrigerants
International Institute of Refrigeration (IIR) (2023-08)Recently, blends created by mixing CO2 with another fluid with a higher critical temperature are being considered, to allow subcritical operation at high outdoor temperature, thus increasing the COP. The goal of this ... -
Experimental study of an R1234ze(E)/R134a mixture (R450A) as R134a replacement
Elsevier (2015)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 ... -
Performance assessment of an experimental CO2 transcritical refrigeration plant working with a thermoelectric subcooler in combination with an internal heat exchanger
Elsevier (2022-07-19)Regulations in the refrigeration sector are forcing the transition to low global warming potential fluids such as carbon dioxide in order to decrease direct greenhouse gases emissions. Several technologies have arisen over ... -
Subcooling systems in transcritical CO2 refrigeration cycles. Experimental evaluation of energy improvement
Universitat Jaume I (2022-05-04)The F-Gas regulation regulates or prohibits the use of certain refrigerants in refrigeration installations in order to reduce greenhouse gasses emissions and mitigate global warming. This leaves CO2 as the best solution ...