Journal
APPLIED THERMAL ENGINEERING
Volume 96, Issue -, Pages 441-453Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2015.11.088
Keywords
Desiccant evaporative cooling; Liquid desiccant; Membrane enthalpy exchanger; System retrofit
Funding
- National Research Foundation (NRF) - Korean government [2015R1A2A1A05001726]
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The objective of this research is to retrofit a liquid desiccant (LD) and indirect/direct evaporative cooling assisted 100% outdoor air system (LD-IDECOAS) to enhance its operating energy saving potential. Two retrofit cases of existing LD-IDECOAS have been considered. The first case involves replacing the indirect and direct evaporative coolers with an M-cycle or a dew-point indirect evaporative cooler (i.e., Case 1), and the other one involves adding an enthalpy exchanger before the LD unit of the system in case 1 (i.e., Case 2). By conducting detailed energy simulations for each retrofit case, the improvements in operating energy saving and the coefficient of performance (COP) over the existing LD-IDECOAS were quantitatively evaluated. The results showed that case 1 might provide enhancement in cooling capacity and thermal COP; however, the heating energy consumption for regenerating the desiccant solution increased with the higher process airflow rate when compared to the existing LD-IDECOAS. It was also found that the cooling capacity, thermal COP, and primary COP could be improved by adding a membrane enthalpy exchanger, as done in case 2, without any significant increase in the heating energy consumption for regenerating the desiccant solution. (C) 2016 Elsevier Ltd. All rights reserved.
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