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CHAPTER VI WATER TRANSPORT PROPERTIES OF NAFION⃝R MEMBRANE MODULES EFFECTS OF SCALE 6.1 Introduction Recently, Nafion⃝R membranes have gained the interest of NASA for use as a pretreatment for air revitalization.4 Currently NASA employs desiccant dryers to remove the water vapor associated with the cabin air, and these are highly energy intensive. By utilizing a shell and tube membrane, the size of the desiccant dryers required could be reduced significantly.4 However, the flow rates required for the car- bon dioxide removal assembly (CDRA) are much higher than previously characterized membranes are capable of handling. In this paper we determine the effects of scale on the performance of a concen- tric tube Nafion⃝R membrane module consisting of 7000 tubes in a shell in counter- current operation. We solve a system of nonlinear equations numerically for mass and energy transport in order to develop concentration and temperature profiles as well as determine the membrane’s efficiency based on the surface area utilized. We believe this is the first study performed which attempts to determine the effects of scale on the dehydration performance of such a membrane module. 6.2 Experiments The experimental apparatus used to determine scaling effects of a Nafion⃝R membrane module in a shell and tube configuration is shown in Figure 6.1. We used a membrane module purchased from PermaPure, Inc. (PR-178-02-01) consisting of 7000 tubes housed within a polypropylene shell. The tubes are gathered together in a set of 30 bundles centered end to end with common headers. The full membrane dimensions are shown in Table 6.1. 104PDF Image | TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONS
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