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Maximum Exergetic Efficiency Operation of a Solar Powered H2O-LiBr Absorption Cooling System

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Department of Engineering Thermodynamics, University Politehnica of Bucharest, Bucharest 060042, Romania
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Department of Rolling Stock, University Politehnica of Bucharest, Bucharest 060042, Romania
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Author to whom correspondence should be addressed.
Entropy 2017, 19(12), 676; https://doi.org/10.3390/e19120676
Received: 22 October 2017 / Revised: 3 December 2017 / Accepted: 6 December 2017 / Published: 9 December 2017
(This article belongs to the Section Thermodynamics)
A solar driven cooling system consisting of a single effect H2O-LiBr absorbtion cooling module (ACS), a parabolic trough collector (PTC), and a storage tank (ST) module is analyzed during one full day operation. The pressurized water is used to transfer heat from PTC to ST and to feed the ACS desorber. The system is constrained to operate at the maximum ACS exergetic efficiency, under a time dependent cooling load computed on 15 July for a one storey house located near Bucharest, Romania. To set up the solar assembly, two commercial PTCs were selected, namely PT1-IST and PTC 1800 Solitem, and a single unit ST was initially considered. The mathematical model, relying on the energy balance equations, was coded under Engineering Equation Solver (EES) environment. The solar data were obtained from the Meteonorm database. The numerical simulations proved that the system cannot cover the imposed cooling load all day long, due to the large variation of water temperature inside the ST. By splitting the ST into two units, the results revealed that the PT1-IST collector only drives the ACS between 9 am and 4:30 pm, while the PTC 1800 one covers the entire cooling period (9 am–6 pm) for optimum ST capacities of 90 kg/90 kg and 90 kg/140 kg, respectively. View Full-Text
Keywords: solar cooling; fully mixed mass storage; exergetic efficiency; water-lithium bromide absorption cooling; modular storage solar cooling; fully mixed mass storage; exergetic efficiency; water-lithium bromide absorption cooling; modular storage
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Stanciu, C.; Stanciu, D.; Gheorghian, A.-T.; Tănase, E.-B.; Dobre, C.; Spiroiu, M. Maximum Exergetic Efficiency Operation of a Solar Powered H2O-LiBr Absorption Cooling System. Entropy 2017, 19, 676.

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