Dynamic modelling of an air-cooled LiBr-H2O absorption chiller based on heat and mass transfer empirical correlations
Visualitza/Obre
O.4.5.4-Dynamic-modelling-of-an-air-cooled-LiBr-H2O-absorption-chiller-based-on-heat-and-mass-transfer.pdf (656,4Kb) (Accés restringit)
Sol·licita una còpia a l'autor
Què és aquest botó?
Aquest botó permet demanar una còpia d'un document restringit a l'autor. Es mostra quan:
- Disposem del correu electrònic de l'autor
- El document té una mida inferior a 20 Mb
- Es tracta d'un document d'accés restringit per decisió de l'autor o d'un document d'accés restringit per política de l'editorial
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/116206
Tipus de documentComunicació de congrés
Data publicació2017
Condicions d'accésAccés restringit per política de l'editorial
Tots els drets reservats. Aquesta obra està protegida pels drets de propietat intel·lectual i
industrial corresponents. Sense perjudici de les exempcions legals existents, queda prohibida la seva
reproducció, distribució, comunicació pública o transformació sense l'autorització del titular dels drets
Abstract
The paper describes the numerical modelling of a direct air-cooled single-effect absorption chiller and validates the obtained results by means of experimental data obtained from an own-designed and commissioned small capacity absorption chiller. This direct air-cooled single-effect absorption machine is conceived for low temperature driven, such as solar cooling or waste heat. For performing numerical simulations, a modular objectoriented simulation platform is used (NEST platform tool), which allows the linking between different components (solar collectors, pump, valves, heat exchangers, absorption chiller, etc.). This modelling put in relevance valuable information for further regulation and control protocols. In this numerical platform each component is an object of an arbitrary complexity, which can be either an empirical-based lumped model (e. g. heat exchangers, valves, pumps, etc.) or a detailed 3D CFD calculation if necessary. A lumped parametric dynamic model based on mass, momentum and energy balances, applied to the internal components of the absorption machine (absorber, generator, condenser, evaporator and solution heat exchanger) has been implemented. Thermal and mass storage in each one of the components are taken into account in the transient evaluation and pressure losses in the solution heat exchanger are evaluated by means of a resistance coefficient. The model depends on heat and mass transfer coefficients, which has been implemented depending on basic empirical correlations. The aim of this paper is to improve the available numerical modelling approaches by analyzing the heat & mass transfer phenomena based on previous experiences in falling film absorption. As a first step the model is validated against the results of a previous laboratory prototype. Finally, the performance of a prototype demonstration 7 kW air-cooled LiBr-H2O absorption chiller is calculated.
CitacióFarnós, J., Castro, J., Papakokkinos, G., Morales Ruiz, S., Oliva, A. Dynamic modelling of an air-cooled LiBr-H2O absorption chiller based on heat and mass transfer empirical correlations. A: IEA Heat Pump Conference. "Proceedings of 12th IEA Heat Pump Conference". 2017, p. 1-11.
ISBN978-90-9030412-0
Versió de l'editorhpc2017.org/wp-content/uploads/2017/06/o454.pdf
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
O.4.5.4-Dynamic ... heat-and-mass-transfer.pdf | 656,4Kb | Accés restringit |