Results 191 to 200 of about 3,587 (228)
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A novel lithium bromide absorption chiller with enhanced absorption pressure
Applied Thermal Engineering, 2012Abstract Although lithium bromide absorption chillers (LBACs) are widely used to provide thermal comfort by utilizing waste heat, they suffer from low efficiency. This paper presents an experimental investigation on a novel reformed LBAC based on the absorption principle of the lithium–bromide/water solution in the sub-steady equilibrium state that ...
Guozhen Xie +4 more
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Experimental study of an ammonia-water absorption chiller
International Journal of Refrigeration, 2012Abstract This paper presents the performance of an ammonia-water absorption chiller. This single-stage 10 kW absorption chiller is cooled with a water-ethylene glycol solution. The required heat source is hot water between 75 °C and 85 °C. Different operating conditions can be imposed by varying temperatures and flow rates of secondary circuits and ...
Brice Le Lostec +2 more
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Solar Cooling with Absorption Chillers: Control Strategies and Transient Chiller Perfomance
2006This thesis reports on improvements of the state of the art in controlling solar cooling systems with absorption chillers. In this context, two main approaches are being presented. In the first approach, control strategies for the system circuits are being presented and discussed.
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Thermoeconomic life-cycle costs of absorption chillers
Building Services Engineering Research and Technology, 1997Thermoeconomics, which is a blend of thermodynamic and economic analysis, can be used to determine life-cycle equipment costs. This paper deals with the application of thermoeconomic theory to absorption chillers. Both initial and operating costs are considered. The best chiller selections for specific operating conditions are identified.
R. Tozer, R. James
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Development of a solar-driven diffusion absorption chiller
Solar Energy, 2019Abstract Nowadays, the diffusion absorption process is well known and mainly used as refrigerators in hotels and caravans. The huge advantage of this process is the noiseless and wear-free operation due to the absence of moving parts. There are few studies where the diffusion absorption process is combined with solar cooling.
Fabian Schmid +2 more
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Performance improvement of a butane/octane absorption chiller
Energy, 2011To improve the coefficient of performance (COP) of an absorption chiller working with the n-butane as refrigerant and the n-octane as absorbent, a thermodynamic analysis based on the first and the second law of thermodynamic is required. A simulation model is established to calculate the different thermodynamic properties of each point of the cycle ...
Nihel Chekir, Ahmed Bellagi
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Investigation of a Ammonia-Water Absorption Chiller Performance
2010 Asia-Pacific Power and Energy Engineering Conference, 2010An experimental prototype of a single stage ammonia-water absorption chiller was designed, built and tested. The thermodynamic models of the components, based on the First and Second Laws, have been assembled so as to quantify the simultaneous heat and mass transfer processes occurring within the exchangers.
Dingfeng Kong +3 more
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Thermodynamic modeling of an ammonia–water absorption chiller
International Journal of Refrigeration, 2002Abstract This article develops a general thermodynamic framework for the modeling of an irreversible absorption chiller at the design point, with application to a single-stage ammonia–water absorption chiller. Component models of the chiller have been assembled so as to quantify the internal entropy production and thermal conductance (UA) in a ...
H.T. Chua, H.K. Toh, K.C. Ng
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A characteristic mass fraction difference in absorption chillers
International Journal of Refrigeration, 2019Abstract Absorption chillers are considered as heat transfer devices and hence most commonly modeled as heat transfer processes. The absorption of the refrigerant vapor though inherently involves mass transfer into the absorbent, which in comparison to the heat transfer usually is a slow transport process.
T. Meyer, F. Ziegler
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On the modeling of absorption chillers with external and internal irreversibilities
Applied Thermal Engineering, 1997In this paper, the authors present a comparison of the performance of absorption chillers by using the predictions from three types of semi-ideal or endoreversible models, the thermodynamic model and the actual performance data of a commercially available chiller.
Ng, K.C., Chua, H.T., Han, Q.
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