Experimental Performance of a Membrane Desorber Operating under Simulated Warm Weather Condensation Temperatures
| Autor: | U. Dehesa-Carrasco, J. Ibarra-Bahena, Eduardo Venegas-Reyes, Rosenberg J. Romero, Sandra Daniela Nanco-Mejía, Wilfrido Rivera |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
020209 energy Mass flow Analytical chemistry Filtration and Separation TP1-1185 02 engineering and technology absorption cooling systems Article Refrigerant chemistry.chemical_compound Chemical engineering 020401 chemical engineering Boiling 0202 electrical engineering electronic engineering information engineering Chemical Engineering (miscellaneous) 0204 chemical engineering Atmospheric pressure business.industry Lithium bromide air gap membrane distillation Chemical technology Process Chemistry and Technology Condensation Coefficient of performance chemistry TP155-156 business desorption process Thermal energy water/LiBr mixture |
| Zdroj: | Membranes Volume 11 Issue 7 Membranes, Vol 11, Iss 474, p 474 (2021) |
| ISSN: | 2077-0375 |
| DOI: | 10.3390/membranes11070474 |
| Popis: | In absorption systems using the aqueous lithium bromide mixture, the Coefficient of Performance is affected by the desorber. The main function of this component is to separate the refrigerant fluid from the working mixture. In conventional boiling desorbers, constant heat flux and vacuum pressure conditions are necessary to carry out the desorption process, and usually, the absorbers are heavy and bulky thus, they are not suitable in compact systems. In this study, a membrane desorber was evaluated, operating at atmospheric pressure conditions with a water/lithium bromide solution with a concentration of 49.6% w/w. The effects of the solution temperature, solution mass flow, and condensation temperature on the desorption rate were analyzed. The maximum desorption rate value was 6.1 kg/m2h with the following operation conditions: the solution temperature at 95.2 °C, the solution mass flow at 4.00 × 10−2 kg/s, and the cooling water temperature at 30.1 °C. On the other hand, the minimum value was 1.1 kg/m2h with the solution temperature at 80.2 °C, the solution mass flow at 2.50 × 10−2 kg/s, and the cooling water temperature at 45.1 °C. The thermal energy efficiency, defined as the ratio between the thermal energy used to evaporate the refrigerant fluid with respect to the total thermal energy entering the membrane desorber, varied from 0.08 to 0.30. According to the results, a high solution mass flow, a high solution temperature, and a low condensation temperature lead to an increase in the desorption rate however, a low solution mass flow enhanced the thermal energy efficiency. The proposed membrane desorber could replace a conventional boiling desorber, especially in absorption cooling systems that operate at high condensation temperatures as in warm weather regions. |
| Databáze: | OpenAIRE |
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