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A performance comparison of transport membrane condenser with different membrane shape and material
Van Cong Le(레반콩),Jun Cong Ge(갈준총),Thanh Phuong Nguyen(응웬탄푸옹),Thi Nhan Nguyen(응웬티난),Song Ju Hong(홍성주),Chan Woo Park(박잔우) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Flue gas from boiler contains a large amount of heat loss and wastewater. Recovery of heat and vapor is highly expected to enhance boiler efficiency and reduce its consumption. Based on the sensible heat and latent heat of vapor in the hot flue gas, membrane condenser can achieve high recover efficiencies by a proper membrane. In this study, the humidity gas was used as artificial flue gas while cooling water contribute to the condensation and transport of vapor. Different membranes were applied when membrane area and operating conditions were kept similar. The performance of plate type and circular type ceramic membrane were compared together. In order to enhance the recovery efficiency of condenser, membrane surface was modified by different methods and materials to obtain the optimal membrane properties. Furthermore, the self-made membrane substrate was developed to compare with the commercially available membrane.
ANN-based prediction of Nusselt number in PCM heat exchanger for solar heat storage
Thi Nhan Nguyen(응웬티난),Byungryun Kim(김병련),Thanh Phuong Nguyen(응웬탄풍),Van Cong Le(레반콩),Chanwoo Park(박찬우) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this study, heat transfer during the melting process of paraffin wax as a phase change material (PCM) is researched. To predict Nusselt number, the melting characteristic of PCM, an artificial neural network (ANN) model is built. Datasets from experiment are used for training and testing the ANN model in the ratio of 80% and 20%, respectively. Rayleigh, Fourier and Stefan numbers are set as input parameters of the network. The accuracy of developed model is evaluated by Mean square error (MSE). The optimal structure of ANN based on minimum MSE has high accuracy in predicting the heat transfer characteristics during PCM melting.