Experimental study of heat recovery for heat pipe in liquid desiccant dehumidification system

• Main Author: Zhang, Yuanhao
• Other Authors: Cai Wen Jian
• Format: Theses and Dissertations
• Language: English
• Published: 2015
• Subjects: DRNTU::Engineering
• Online Access: http://hdl.handle.net/10356/64904
• Institution: Nanyang Technological University

This thesis studies the heat transfer performance of the heat pipe and the effect on regeneration performance with or without heat pipe in the Liquid Desiccant Dehumidification System (LDDS). Based on experimental approach project mainly consists of three sections which are the studies of the heat transfer of heat pipe, experiment analysis and conclusion. The studies of the heat transfer of heat ptpe includes the heat conduction, the heat transfer of finned tube, the heat transfer coefficient, the pressure drop of fluid and the design procedure of heat pipe exchanger. Based on the expected temperature of the recovered air, the heat exchange area of the heat pipe exchanger can be calculated using mathematical formula. The heat exchange area calculated would be a reference to choose how many heat pipes are used. For the heat pipe exchanger itself, some experiments have been done to research the effect on the heat exchange rate and the heat exchange efficiency under the condition of changing one of three variables which are the air flow rate, the inlet hot air temperature and the row number of heat pipe respectively. In LDDS, some experiments have been completed to compare the regeneration performance with or without heat pipe exchanger. Using the heat pipe exchanger in the regeneration unit of LDDS can recover some heat energy loss to enhance the regeneration performance. But some variables would affect heat recovery amount. So some optimizations would be studies to obtain a better regeneration performance. The objective of this project is to investigate the heat transfer of the heat pipe exchanger in theory, and the heat transfer performance and the effect on the regeneration performance in LDDS by analyzing the experimental data.