Results 201 to 210 of about 1,076 (257)
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Refrigerant charge in refrigerating systems and strategies of charge reduction
International Journal of Refrigeration, 2008Depuis quelques années, la réglementation européenne concernant les systèmes frigorifiques devient de plus en plus sévère. En raison de leur conception et de leur technologie, les unités frigorifiques génèrent des fuites de fluide frigorigène, et peuvent ainsi avoir un impact nocif sur l'environnement.
D Leducq
exaly +3 more sources
Refrigerant charge distribution in brine-to-water heat pump using R290 as refrigerant
International Journal of Refrigeration, 2023 This paper presents experimental results from a brine-to-water heat pump used for space heating at low temperature, with a low refrigerant charge of R290 (propane). Performance and refrigerant distribution were analysed in every test condition studied. Performance results show a declared heating capacity of , obtaining a specific capacity (Cc) of 48.7 ...
Luis Sánchez-Moreno Giner +2 more
exaly +3 more sources
Virtual refrigerant charge sensor for booster refrigeration systems
International Journal of Refrigeration, 2021Abstract In this paper a virtual refrigerant charge sensor (VRCS) for a booster refrigeration system with a receiver unit is developed and proposed. The VRCS estimates the liquid charge in the receiver unit by utilizing a combined mass and energy balance equation for mapping the change in the receiver unit’s time constant to the liquid volume in the ...
Glenn Andreasen +2 more
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Extension of a virtual refrigerant charge sensor
International Journal of Refrigeration, 2015 The primary goal of the work described in this paper was to evaluate and extend a virtual refrigerant charge sensor (VRC) for determining refrigerant charge for equipment having variable-speed compressors and fans. Based on the evaluations, the original VRC sensor (termed model I) was found to work well in estimating the refrigerant charge level for ...
James E Braun
exaly +3 more sources
Refrigerant Charge Optimization of Air Conditioning System with Hydrocarbon Refrigerant
SSRN Electronic Journal, 2021Determination of the amount of refrigerant in a vapor compression refrigeration system requires several approaches depending on the design and installation of the piping on each refrigeration component. For chiller systems or other packaged systems that are already loaded with refrigerant and do not require piping installation in the refrigeration ...
Fathurrahman Yudhi Nugraha +2 more
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Determination of a vapor compression refrigeration system refrigerant charge
Journal of Thermal Science, 1995A physical model is established in this paper to describe the heat transfer and two phase flow of a refrigerant in the evaporator and condenser of a vapor compression refrigeration system. The model is then used to determine the refrigerant charge in vapor compression units.
Chun-Xin Yang, Chao-Bin Dang
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Refrigeration systems with minimum charge of refrigerant
Applied Thermal Engineering, 2007Concern 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,
exaly +2 more sources
Determination of optimum refrigerant charge for domestic refrigerator units
International Journal of Refrigeration, 1984Abstract A method is given of assessing the optimum refrigerant (R12) charge for domestic refrigerators employing a capillary tube expansion device. This amound of refrigerant was found to depend mostly on the volumes of the evaporator and condenser in broad accordance with an earlier theoretical analysis which, however, tended to overestimate the ...
V.I Dmitriyev, V.E Pisarenko
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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, 2005Independently 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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New flammable refrigerant charge limit in commercial refrigeration.
2021The Kigali Amendment to the Montreal Protocol, European F-Gas regulation as well as similar legislation in parts of the planet, in place to mitigate climate change, are going to limit the usage of high GWP refrigerants in the next few years in the majority of categories of commercial refrigeration applications.
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