Displacement ventilation (DV) combined withliquid desiccant membranecooled ceiling (LDMC-C)isaneﬃcient Heating, ventilation and Air conditioning (HVAC) system. However, the LDMC-C/DV has limited performance in oﬃce spaces located in hot and humid climates or characterized by high internal latent loads due to the inability to control the humidity. This study proposes a cascaded liquid desiccant system in which the liquid desiccant ﬂow exiting the LDMC-C is directed into a liquid desiccant heat and mass exchanger in the DV supply duct to control the humidity in the space and conserve energy. To achieve this goal, an integrated model for diﬀerent components of the cascaded liquid desiccant system is developed to predict the comfort level and the air quality inside the space as well as the energy consumption of the system. The model was validated experimentally in a climatic chamber. The validated integrated system model was applied to a case study to assess the eﬀectiveness of the system in hot and humid climate. Two conﬁgurations of the LDMC-C and mass exchanger were simulated and found to provide acceptable humidity for comfort in the occupied zone of the space. Moreover, the cascaded system cooling and heating energy were found lower by 21.25% and 16.23% respectively in August when compared to a LDMC-C/DV, and to DV membrane exchanger system with diﬀerent conﬁguration. The cooling and heating energies were also lower in the cascaded system compared to a LDMC-C/DV while using conventional supply air dehumidiﬁcation method.
Cascaded liquid desiccant system for humidity control in space conditioned by cooled membrane ceiling and displacement ventilation / Charara, J.; Ghaddar, N.; Ghali, K.; Zoughaib, A.; Simonetti, M.. - In: ENERGY CONVERSION AND MANAGEMENT. - ISSN 0196-8904. - ELETTRONICO. - 195(2019), pp. 1212-1226.
|Titolo:||Cascaded liquid desiccant system for humidity control in space conditioned by cooled membrane ceiling and displacement ventilation|
|Data di pubblicazione:||2019|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.enconman.2019.05.102|
|Appare nelle tipologie:||1.1 Articolo in rivista|