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Energy storage efficiency for the ammonia/hydrogen‐nitrogen thermochemical energy transfer system
Author(s) -
Williams O. M.,
Carden P. O.
Publication year - 1979
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4440030105
Subject(s) - endothermic process , thermodynamics , chemistry , ammonia , hydrogen , work (physics) , thermochemical cycle , nitrogen , energy storage , heat exchanger , ammonia production , exothermic reaction , heat transfer , thermal energy storage , mixing (physics) , hydrogen production , process engineering , organic chemistry , power (physics) , physics , adsorption , engineering , quantum mechanics
Energy storage efficiency is calculated for the solar thermochemical energy transfer system based on ammonia/hydrogen‐nitrogen. the calculation for this system involves generation of thermodynamic data not available in the literature by a method in which use is made of the available phase equilibrium measurements together with application of the criterion that the correct value of separation work for a two‐phase mixture must be generated internally by degradation of mixing heat. Energy storage efficiencies for ammonia/hydrogen‐nitrogen are derived from the generated thermodynamic data and are shown to increase towards unity as the endothermic reaction approaches completion, with efficiencies greater than 0.90 being obtained for reaction extents exceeding 0.60. the validity of the analysis has been tested successfully by comparison between the thermodynamic predictions and experimental data in the form of measurements of the waste heat rejected from a counterflow heat exchanger operated with liquid ammonia feed and ammonia/hydrogen‐nitrogen output.