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Table 5.1: Table of membrane dimensions. Nt L Tube ID Tube OD lm Shell ID 100 1.1 m 0.64 mm 0.84 mm 0.1 mm 12.7 mm on the shell side. We propose a model modified from the work of Ye and LeVan9 for the dehydration of an air stream at various flow rates and feed relative humidities. 5.2 Experiments The experimental apparatus used to characterize the drying performance of a Nafion⃝R shell and tube membrane module with a vacuum purge is shown in Figure 5.1. We used a membrane purchased from PermaPure, Inc. (PD-100T-48MSS) with 100 tubes housed in a stainless steel shell. The dimensions of the membrane are shown in Table 5.1. To deliver a feed stream of known humidity to the tube inlet of the mem- brane, compressed laboratory air flowed through a pressure swing adsorption (PSA) dehydration system and then passed through a manifold with 4 water filled bubblers immersed in a temperature bath consisting of a 50% ethylene glycol and water mix- ture. The gas then flowed through a copper tube approximately 4 m long to reach room temperature before being fed to the membrane module. The required relative humidities were achieved by regulating the temperature of the bath. A mass flow con- troller (MKS) and 4 channel readout were used to regulate the flow of the feed stream. Two relative humidity sensors (Vaisala) were used near the tube inlet and outlet to measure the temperature and relative humidity of the process stream. Three 1000 torr and one 100 torr pressure transducers (MKS) were used to measure the pressure on the tube and shell sides. A turbo pump with a diaphragm priming pump was used 76PDF Image | TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONS
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