A numerical model for the dynamic simulation of a recirculation single-effect absorption chiller

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• 作者：Matthieu Zinet ; Romuald Rulliere ; Philippe Haberschill
• 关键词：Absorption ; Chiller ; Modelling ; Transient ; Water&ndash ; lithium bromide ; Falling film
• 刊名：Energy Conversion and Management
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：62
• 期：Complete
• 页码：51-63
• 全文大小：1280 K

文摘

A dynamic model for the simulation of a new single-effect water/lithium bromide absorption chiller is developed. The chiller is driven by two distinct heat sources, includes a custom integrated falling film evaporator-absorber, uses mixed recirculation and is exclusively cooled by the ambient air. Heat and mass transfer in the evaporator-absorber and in the desorber are described according to a physical model for vapour absorption based on Nusselt¡¯s film theory. The other heat exchangers are handled using a simplified approach based on the NTU-effectiveness method. The model is then used to analyze the chiller response to a step drop of the heat recovery circuit flow rate, and to a sudden reduction of the cooling need in the conditioned space. In the latter case, a basic temperature regulation system is simulated. In both simulations, the performance of the chiller is well represented and consistent with expectations.