Solar Heat for Industrial Processes (SHIP) is a growing-interest concept in the context of the reduction of both energy consumption and greenhouse gases emissions. As industry often needs cooling power at negative temperatures, solar-fuelled NH3/H2O absorption systems can be employed for this task. In the context of the FriendSHIP European project, different innovative solutions are investigated for cooling production at -20°C and -40°C from 100-250°C solar heat. The first proposition concerns a GAX (Generator-Absorber heat eXchange) cycle based on Plate Heat Exchangers (PHE). This innovative design improves heat and mass transfers, thus performance. In addition, manufacturing costs decrease, as the needed components are standardized and available in the market. Two variants are simulated on EES (Engineer Equation Solver) for -20°C and -40°C cooling production. Other absorption cycles are modified to fit PHEs, in particular the pressure-staged cycle, the vapour-exchange cycle and the Semi-GAX cycle. They all are two-stage cycles and are simulated for -40°C cooling production only. The numerical comparison allows identifying the best solutions for the SHIP integration, giving an overview on the operating temperature ranges for each cycle. In particular, the following results are obtained. At ambient temperature TAMB = 20°C and below, the GAX cycle is the most performing one. It shows a maximum Coefficient of Performance (COP) of 0.53 for a cold production TE,OUT = -20°C (+27% compared to the single-stage cycle), and a COP of 0.36 at TE,OUT = -40°C (+60% than the single-stage cycle). For TAMB > 30°C, the pressure-staged cycle with GAX is the preferable one, as it can be operated with COP>0.15 at TAMB up to 50°C. The Semi-GAX cycle seems the most adapted to operation at low heat source temperature, being able to operate down to 80°C with COP>0.20.
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6 October 2023
SolarPACES: SOLAR POWER & CHEMICAL ENERGY SYSTEMS: 27th International Conference on Concentrating Solar Power and Chemical Energy Systems
27 September–1 October 2021
Online
Research Article|
October 06 2023
Numerical study on multi-effect and multi-stage NH3/H2O absorption chillers for negative cooling in SHIP systems
Fabio Aste;
Fabio Aste
a)
CEA LITEN, DTCH, INES
, 50 Avenue du Lac Léman, 73370 Le Bourget-du-Lac, FRANCE
a)Corresponding author: [email protected]
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Hai Trieu Phan
Hai Trieu Phan
b)
CEA LITEN, DTCH, INES
, 50 Avenue du Lac Léman, 73370 Le Bourget-du-Lac, FRANCE
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a)Corresponding author: [email protected]
AIP Conf. Proc. 2815, 140001 (2023)
Citation
Fabio Aste, Hai Trieu Phan; Numerical study on multi-effect and multi-stage NH3/H2O absorption chillers for negative cooling in SHIP systems. AIP Conf. Proc. 6 October 2023; 2815 (1): 140001. https://doi.org/10.1063/5.0149485
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