Extension of the characteristic equation to absorption chillers with adiabatic absorbers

Gutiérrez-Urueta, G.; Rodríguez, Pedro; Ziegler, Felix; Lecuona, A.; Rodríguez-Hidalgo, M.C.

doi:10.1016/j.ijrefrig.2011.10.010

Cited by 25 publications

(10 citation statements)

References 11 publications

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“…The experimental COP was calculated as the quotient of (2) and (3). 4In this work, the selection of variables involved in the obtaining of an ANN model is based on the proved dependency of the facility performance with external water circuit temperatures and the "overflow" of refrigerant in the evaporators (Gutiérrez et al, 2012). The overflow depends on the internal fluid temperatures of the liquid refrigerant at the condenser exit and the evaporators entries T l,C , T l,E1 , T l,E2 , as well as the low pressure P low and condenser exit pressure P C,o .…”

Section: Relevant Parametersmentioning

confidence: 99%

Estimación de desempeño y optimización de un sistema de absorción adiabático H2OLiBr usando redes neuronales artificiales

Gutiérrez-Urueta

Colorado

Hernández

et al. 2019

iit

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The search for alternatives to curb climate change and its devastating consequences for today's society, leads to research environmentally friendly climate systems. To optimize or control them, artificial neural networks (ANN) is considered an effective option. Adiabatic absorption is based on separate design for heat and mass transfer process in order to reduce the size of equipment. This study deals with the application of ANN on the experimental results of a single effect water-lithium bromide adiabatic absorption facility and its optimization using an inverse ANN. Transient and steady state data were used to obtain three empirical models. The models developed correspond to the coefficient of performance (COP), cooling power and generation power of the facility. Steady state statistics consists of 219 experimental points obtained at different operating conditions. These data were used to train and test the steady state and transient ANN models. For transient statistics, 1445 values were considered for a period. In the validation data set, the results showed that simulations and the experimental data were in good agreement with an R > 0.98 for both steady state and transient models. A model for COP, based on the principle of accessibility of data, was developed including temperatures for the external fluid circuits with good results. The inverse neural model applied to transient data demonstrated satisfactory results as well, making possible the optimization of the facility. These results illustrate the adequacy in using an ANN with transient data in absorption systems, making it especially attractive for solar cooling applications.

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Section: Relevant Parametersmentioning

confidence: 99%

Estimación de desempeño y optimización de un sistema de absorción adiabático H2OLiBr usando redes neuronales artificiales

Gutiérrez-Urueta

Colorado

Hernández

et al. 2019

iit

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“…In the absorber, both recirculated and strong solutions are mixed after the absorption process. The experimental setup configuration is described in detail in other publications, Guti errez et al 8,9 III. EXERGY ANALYSIS Exergy is defined as the maximum amount of work that can be extracted from a physical system or stream by exchanging matter and energy with large reservoirs in a reference state.…”

Section: System Descriptionmentioning

confidence: 99%

“…These publications are summarized in Venegas et al 5,6 and Arzoz. 7 More recent papers in the field of adiabatic absorption using the mixture water-LiBr or lithium are presented by Guti errez et al, 8,9 including the works reported by Warnakulasuriya and Worek, 10 Elperin et al, 11 and Wang et al 12 An exergy analysis identifies the location, magnitude, and sources of thermodynamic inefficiencies in an energy conversion system according to Morosuk and Tsatsaronis. 13 It is important to determine a precise behaviour of the systems, complementing the information given by an analysis based on the first law of thermodynamic.…”

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confidence: 99%

Energy and exergy analysis of an adiabatic water-LiBr absorption system

Gutiérrez-Urueta

Huicochea

Rodríguez-Aumente

et al. 2014

Journal of Renewable and Sustainable Energy

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Articles you may be interested inEnergy and exergy analysis of gas production from biomass intermittent gasification J. Renewable Sustainable Energy 5, 063141 (2013); 10.1063/1.4857395Thermo-economic analysis of absorption air cooling system for pressurized solid oxide fuel cell/gas turbine cycle Energy and exergy analysis of hybrid photovoltaic/thermal solar water heater considering with and without withdrawal from tank J. Renewable Sustainable Energy 2, 043106 (2010); 10.1063/1.3464754 Exergy analysis of particle dispersed latent heat thermal storage system for solar water heaters

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“…A number of researchers have studied the steady-state performance of AC by both theoretical simulations [8][9][10] and experiments [11][12][13][14]. However, the real-time operation of a commercial AC is governed by continuous transient processes, and the relaxation time required to achieve a new steady-state is rather long compared to the vapor compression chiller with a similar cooling capacity [15,16].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Performance Analysis for an Absorption Chiller under Different Working Conditions

Wang

Shang

et al. 2017

Applied Sciences

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Featured Application: The dynamic performance of the absorption chiller (AC) under different working conditions in this work is significant for the operation of the whole system, of which the stabilization can be affected by the AC transient process.Abstract: Due to the merits of energy saving and environmental protection, the absorption chiller (AC) has attracted a lot of attention, and previous studies only concentrated on the dynamic response of the AC under a single working condition. However, the working conditions are usually variable, and the dynamic performance under different working conditions is beneficial for the adjustment of AC and the control of the whole system, of which the stabilization can be affected by the AC transient process. Therefore, the steady and dynamic models of a single-effect H 2 O-LiBr absorption chiller are built up, the thermal inertia and fluid storage are also taken into consideration. And the dynamic performance analyses of the AC are completed under different external parameters. Furthermore, a whole system using AC in a process plant is analyzed. As a conclusion, the time required to reach a new steady-state (relaxation time) increases when the step change of the generator inlet temperature becomes large, the cooling water inlet temperature rises, or the evaporator inlet temperature decreases. In addition, the control strategy considering the AC dynamic performance is favorable to the operation of the whole system.

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Extension of the characteristic equation to absorption chillers with adiabatic absorbers

Cited by 25 publications

References 11 publications

Estimación de desempeño y optimización de un sistema de absorción adiabático H2OLiBr usando redes neuronales artificiales

Estimación de desempeño y optimización de un sistema de absorción adiabático H2OLiBr usando redes neuronales artificiales

Energy and exergy analysis of an adiabatic water-LiBr absorption system

Dynamic Performance Analysis for an Absorption Chiller under Different Working Conditions

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