This paper presents a model to simulate the combined heat and mass transfer processes that occur in a gas-fired generator of an ammonia water absorption heat pump. The model comprises three interconnected components: the gas furnace, the distillation column and the rectifier. The furnace is modeled like a well-stirred single volume. The distillation column and the rectifier are discretized along their axial dimension. Several heat transfer mechanisms are simultaneously solved: radiative and convective heat transfer between combustion products and generator finned surface, flow boiling and pool boiling in the two-phase ammonia water mixture inside the distillation column. The model is applied to operating conditions of interest in real applications. The generated outputs provide insight on the internal gradients, the quantification of gas furnace efficiency, and effectiveness of solution boiling and internal heat recovery. The model can be used for the simulation of absorption heat pumps with modulating gas burners. © 2015 Elsevier Ltd. All rights reserved.

Analysis of gas-fired NH3-H2O generator with cross flow gas burner

APRILE, MARCELLO;TOPPI, TOMMASO;GUERRA, MARCO;MOTTA, MARIO
2016

Abstract

This paper presents a model to simulate the combined heat and mass transfer processes that occur in a gas-fired generator of an ammonia water absorption heat pump. The model comprises three interconnected components: the gas furnace, the distillation column and the rectifier. The furnace is modeled like a well-stirred single volume. The distillation column and the rectifier are discretized along their axial dimension. Several heat transfer mechanisms are simultaneously solved: radiative and convective heat transfer between combustion products and generator finned surface, flow boiling and pool boiling in the two-phase ammonia water mixture inside the distillation column. The model is applied to operating conditions of interest in real applications. The generated outputs provide insight on the internal gradients, the quantification of gas furnace efficiency, and effectiveness of solution boiling and internal heat recovery. The model can be used for the simulation of absorption heat pumps with modulating gas burners. © 2015 Elsevier Ltd. All rights reserved.
Ammonia; Distillation; Distillation columns; Gas absorption; Gas burners; Gas furnaces; Gases; Heat convection; Heat pump systems; Heat transfer; Mass transfer; Oil furnaces; Rectifying circuits; Waste heat, Absorption cycles; Absorption heat pumps; Ammonia water; Ammonia-water absorption; Combined heat and mass transfers; Convective heat transfer; Heat transfer mechanism; Internal heat recovery, Water absorption; Ammonia-water absorption; Ammonia-water generator; Gas furnace; Gas-fired absorption heat pump; GAX absorption cycle
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1015686
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