Development of an Ammonia/Water Absorption Heat Transformer to upgrade low-temperature industrial waste heat
Résumé
For numerous years, a drastic increase in energy demand has been observed worldwide, mainly originating from fossil fuels, despite an alarming need for a decrease in energy consumption and CO2 emission. Numerous industries need heat at a high temperature while dissipating heat at moderate to low temperature. Answer this need in an environmentally friendly way is required to mitigate the impact of global warming. In this context, sorption systems are a promising solution able to valorise waste energy at a low electricity cost, up to ten times less electrical power compared to an equivalent vapour compression heat pump. Specifically, Absorption Heat Transformer (AHT) are a type of absorption machine able to recover low-level waste heat (~80°C) in order to provide higher-level heat (>100°C) necessary for vapour production or other industrial uses. In this study, a single stage AHT based on the NH3/H2O mixture is modelled and simulated. Results enable to evaluate the performances of the AHT fed by industrial waste heat and cooled by ambient air. The influence of both the waste heat and ambient air temperatures are evaluated. Different coefficients of performances based on the heat transferred and/or the electricity consumption are calculated as well as the expected output temperature of the hot heat sink. Finally, the range of valuable working conditions for the system are discussed.
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