Energy grade splitting of hot water via a double effect absorption heat transformer

Xu, Z.Y.; Gao, Jiao; Mao, H.C.; Liu, D.S.; Wang, R.Z.

doi:10.1016/j.enconman.2020.113821

Cited by 10 publications

(1 citation statement)

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“…Further, in this case, the development activities focus on innovative working pairs, especially investigating ionic liquid as alternative to standard salt solutions, showing promising thermodynamic performance [11]. Furthermore, large-scale prototypes were recently developed, based on standard LiBr/water working pairs [12], demonstrating the possibility of being properly operated as a double effect heat upgrader, in a waste heat temperature range of 130-160 • C, with COP up to 0.61, when the ambient temperature was set to 30 • C and achieving a temperature upgrade of 5-20 K. Other relevant development activities focused on the optimization of the operation strategy of absorption heat transformers, mainly based on numerical models [13]. The results demonstrated that some parameters must be taken into account to properly optimize the performance, such as the amount of solution inside the system, which must be carefully managed depending on the user's needs.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Performance of Adsorption Working Pairs for Low-Temperature Waste Heat Upgrading in Industrial Applications

2021

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The present work aims at the thermodynamic analysis of different working pairs in adsorption heat transformers (AdHT) for low-temperature waste heat upgrade in industrial processes. Two different AdHT configurations have been simulated, namely with and without heat recovery between the adsorbent beds. Ten working pairs, employing different adsorbent materials and four different refrigerants, have been compared at varying working boundary conditions. The effects of heat recovery and the presence of a temperature gradient for heat transfer between sinks/sources and the AdHT components have been analyzed. The achieved results demonstrate the possibility of increasing the overall performance when internal heat recovery is implemented. They also highlight the relevant role played by the existing temperature gradient between heat transfer fluids and components, that strongly affect the real operating cycle of the AdHT and thus its expected performance. Both extremely low, i.e., 40–50 °C, and low (i.e., 80 °C) waste heat source temperatures were investigated at variable ambient temperatures, evaluating the achievable COP and specific energy. The main results demonstrate that optimal performance can be achieved when 40–50 K of temperature difference between waste heat source and ambient temperature are guaranteed. Furthermore, composite sorbents demonstrated to be the most promising adsorbent materials for this application, given their high sorption capacity compared to pure adsorbents, which is reflected in much higher achievable specific energy.

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Section: Introductionmentioning

confidence: 99%