Solar-driven dual-mode cascading cycle based on ammonia complexation reaction for flexible seasonal thermal management

Wu, Su; Wang, Liwei; Zhang, Chen; Zhang, Bo

doi:10.1016/j.cej.2022.139536

Cited by 8 publications

(1 citation statement)

References 43 publications

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“…One of the effective approaches to improving the cooling performance of ACs is exploring high-performing adsorbent/refrigerant working pairs. − Ammonia with zero-carbon and high hydrogen content , has been widely used as a working medium for ice-making, refrigeration, heating, and heat storage. − Recently, ammonia has also received growing research interest as an effective hydrogen carrier. , Except for environmental friendliness, the large vapor pressure and enthalpy of evaporation (around 1 MPa and 1165 kJ/kg at room temperature) endow ammonia with a superior refrigerant for ACs, which favors heat and mass transfer. Since the first working pair of AgCl 2 /ammonia was used by Michael Faraday in 1823, many ammonia-related working pairs based on chemical and physical adsorption have been reported .…”

Section: Introductionmentioning

confidence: 99%

Ammonia Adsorption Performance of Zeolitic Imidazolate Frameworks for Cooling

Liu,

Cheng,

Kim

et al. 2023

Langmuir

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Promoting the cooling performance of adsorption chillers (ACs) greatly relies on the exploration of high-performance adsorbent/refrigerant working pairs. Ammonia is not only an environmentally friendly refrigerant but also favorable for heat and mass transfer in ACs owing to its large vapor pressure and enthalpy of evaporation. Zeolite imidazolate frameworks (ZIFs) with excellent ammonia stability are identified as a class of potential adsorbents for practical ammonia-based ACs. However, high-performing ZIF/ammonia working pairs with excellent AC performance are still to be developed. In this work, the cooling performance including the coefficient of performance for cooling (COPC) and the specific cooling effects (SCEs) of 26 ZIFs with the same composites but different topologies was evaluated by combining molecular simulation and mathematical modeling. Five high-performing ZIFs with COPC > 0.45 and SCE > 250 kJ/kg were identified, among which gis -ZIF with the highest COPC of 0.51 and lta -ZIF with the highest SCE of 354 kJ/kg both are promising to be synthesized and applied further. Besides, the quantitative structure–performance relationship (QSPR) was extracted that can help quickly identify and design high-performing ZIFs according to their ammonia adsorption isotherms and structural characteristics. Moreover, “S”-shaped adsorption isotherms with high saturation adsorption capacity (>0.2 g/g), suitable step position (0.2–0.4), and relatively low Henry’s constant (<1 × 10–5 mol/(kg·Pa)) are more favorable for excellent COPC and SCE. From the perspective of structure characteristics, ZIFs possessing low crystal density (<0.9 g/cm3), high accessible surface area (>2000 m2/g), balanced largest cavity diameter (∼15 Å), and accessible pore volume (∼0.65 cm3/g) are beneficial for high-efficient cooling performance.

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