Abstract
Application of moisture membrane system can increase the efficiency of the HVAC system where the latent heat load is responsible for a large fraction of total energy. The moisture transfer mechanisms in membranes were studied on our experimental device, which supplied dry air and humid air in two regime. The dry air and humid air were delivered to membrane-based enthalpy exchanger with two contraflow cavities separated by the examined membrane. Nine types of hydrophilic membranes were compared by efficiency of moisture transport during isothermal humidity transport for flow velocity from 0.5 to 4ms −1 . 1.2 Moisture transfer In this study the moisture transfer mechanism in the exam- ined hydrophilic membranes are evaluated by efficiency of humidity transport. The hydrophilic membrane has ability to transport the water vapor (diameter of H2O molecule is about 0.28nm) from the humid air stream through the membrane to drier stream which is illustrated in figure 1. Thin membrane has small heat transfer resistance and al- lowsheatandmoisturetransfersimultaneously,butisother- mal process (∆T = 0) was ensured during the measuring.
Highlights
Application of moisture membrane system can increase the efficiency of the HVAC system where the latent heat load is responsible for a large fraction of total energy
The dry air and humid air were delivered to membrane–based enthalpy exchanger with two contraflow cavities separated by the examined membrane
Most of them were based on thermoplastic elastomer (TPE) materials
Summary
Membrane can be defined as a barrier which restricts transfer of various substances from one side to other and only allows certain substances to permeate through it. The membrane discriminate between the various types of molecules because of differences in size, shape or chemical structure. The performance or efficiency of a given membrane is determined by two parameters; its selectivity and the flow through the membrane. These materials have been extensively exploited for use in broad range of applications such as separation and purification, microfiltration and ultrafitration are membrane filtration processes commonly used in water treatment [1], gas separation, bioprocess membrane technology [2] and outerwear materials. The chemical and physical properties of synthetic membranes and separated particles as well as a choice of driving force define a particular membrane separation process. Membranes structure can be homogeneous or heterogeneous with passive transport driven by pressure, concentration or a temperature difference [3]
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