Results 261 to 270 of about 42,712 (311)

Refrigeration systems with minimum charge of refrigerant

Applied Thermal Engineering, 2007
Concern for the environmental effects of HFC-refrigerants as well as the use of flammable refrigerants has resulted in a need of decreasing the refrigerant charge in refrigeration and heat pump systems. This paper discusses the possibility of such reductions, both at the systems- and the component level. It is shown that a move towards indirect systems,
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Refrigeration systems with minimized refrigerant charge: System design and performance

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 2005
Independently of the choice of refrigerant, environmental and/or safety issues can be minimized by reducing leakage and the amount of refrigerant charge in heat pump or refrigeration systems, preferably both. In the investigation reported here, a laboratory test rig was built, simulating a water-to-water heat pump with a heating ...
F Primal, P Lundqvist
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Simulation of compression refrigeration systems

Computer Applications in Engineering Education, 2006
AbstractThis study presents the main features of a software for simulating vapor compression refrigeration systems that are self designed by the user. A library of 10 different components is available: compressor, expansion device, condenser, evaporator, heat exchanger, flash tank, direct intercooler flash tank, indirect intercooler flash tank, mixer ...
Jaime Sieres, José Fernández-Seara
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Natural refrigerants for refrigeration and air-conditioning systems

Applied Thermal Engineering, 1997
In the past, several natural working fluids were used in refrigeration and air-conditioning systems. However, the appearance of CFCs caused a drastic reduction in the utilisation of those fluids. Understanding of the environmental damage of CFCs focused attention on alternative refrigerants. From these, the ones that have minimum (or nil) environmental
S. B. Riffat, C. F. Afonso, A. C. Oliveira, D. A. Reay   +3 more
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Thermodynamic Analysis of a Refrigeration System Operating with R1234yf Refrigerant

2018
After restriction of European Union on using high-GWP refrigerants, the investigations have been directed to utilize low-GWP refrigerants in available systems to determine the suitability of their operating conditions. In this study, energy and exergy parameters were investigated as a result of using R1234yf in a refrigeration system originally ...
Oruç, Vedat, Devecioğlu, Atilla G.
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Refrigeration system including refrigerant noise suppression

The Journal of the Acoustical Society of America, 1990
A refrigeration system comprising in closed series-flow relationship, a condenser, a capillary tube flow restrictor, and an evaporator including means connecting the outlet end of the restrictor to the evaporator inlet for reducing the noise generated by refrigerant flowing from the restrictor.
Mark D. Wattley, Douglas D. Dankel
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Commercial refrigeration system using CO2 as the refrigerant

International Journal of Refrigeration, 2004
Various field-test systems using carbon dioxide as the only refrigerant have been installed since December 2001. In this paper we will analyse an 'all-CO2' supermarket, which has been operating in the North of Italy since January 2003. The seasonal COP is calculated, based on prior laboratory measurements, and a comparison is made with a conventional ...
Sergio Girotto, Silvia Minetto, Petter Neksa   +2 more
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Comparison of Various Alternative Refrigerants for Vapour Compression Refrigeration Systems

ASME/JSME 2011 8th Thermal Engineering Joint Conference, 2011
Single-stage vapour compression refrigeration system was compared with an actual vapour compression cycle, single-stage process with internal heat exchanger, and a two-stage process with economiser using the refrigerants of HCFC-22, CFC-502 and their alternatives such as HFC-134a, HFC-32, HFC-152a, HFC-404A, HFC-407C, HFC-507, HFC-410A.
WONGWISES, Somchai, DALKILIÇ, Ahmet Selim   +1 more
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Investigation of refrigerating system with R12 refrigerant replacements

Applied Thermal Engineering, 2000
This paper deals with the influence of R12 working fluid replacements on energy efficiency and global warming expressed by values of Coefficient of Performance (COP) and Total Equivalent Warming Impact (TEWI). Experimental investigations are presented which relate the use of refrigerants R134a, R401A, R409A, R22 and the mixture of R134a with R12 to the
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Cascade Refrigeration System: R404a-R23 Refrigerant

Asian Journal of Electrical Sciences, 2017
This study is presented a cascade refrigeration system using as refrigerant (R23) in low-temperature circuit and R404a in high-temperature circuit. The operating parameters considered in this paper include superheating, condensing, evaporating, and sub cooling temperatures in the refrigerant (R404a) high temperature circuit and in the refrigerant (R23))
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