Enhancing Performance of Liquid-to-Air Heat Exchanger Using Modified Buffer Storage Material and Passive Solid-State Thermal Transfer Accelerator
摘要
Technology development for heat exchanger grows rapidly to meet the requirement of complex thermal system in modern era. Dual-fluid system utilizes liquid-to-air (LTA) heat exchanger is applicable for various application, including waste heat recovery and liquid-thermal collector. However, operational challenge for the system often arises from direct heat transfer between source and load, making additional modification by introducing buffer storage material (BSM) necessary for possible operational adjustment. This work experimentally assesses the application of BSM for buffer LTA (BLTA). The assessment includes stabilizing BSM to form modified BSM (MBSM) and inclusion of solid-state thermal accelerator to enhance BLTA operation. Stabilization for MBSM reduces the deviation of melting/freezing point, with the lowest deviation of 2.8 °C. Thermal capacity based on latent heat of fusion for MBSMs decrease by 16.3 % to 19.4 %, with the highest value is obtained at 155.9 kJ·kg−1. The charge rate for non-enhanced BLTA ranges between 44.9 °C·h−1 and 52.1 °C·h−1. The given parameter improves to 59.05 °C·h−1 when using MBSM. Also, MBSM combines with enhanced BLTA reaches the highest charging rate of 65.2 °C·h−1. For discharge stage, the average increase in air temperature with enhanced BLTA is 8.9 °C, and it improves by 23.3 % when using MBSM. Overall, combined approach using MBSM and enhanced BLTA indicates reliable working parameters and suitable for operational adjustment in relevant dual-fluid thermal system.