Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"moisture transfer"”.
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Transient heat and moisture transfer to skin through thermally-irradiated cloth
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1959.
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Analytical and numerical studies of heat and moisture transfer through porous insulation
… analytical and numerical studies of heat and moisture transport through a porous insulation in the presence of condensation, with impermeable, adiabatic vertical boundaries, and with one horizontal boundary facing a warm humid ambient and the other facing a cold impermeable surface. The …
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Moisture transfer in porous materials exposed to combined humidity and temperature gradients
Moisture migration is responsible for much damage in modern buildings. Air infiltrations were almost eliminated because of the use of various qualities of materials and insulation. Water is mainly transferred through building materials by diffusion, under three different phases (vapor, liquid and …
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Influence of initial turbulence intensity on the heat and moisture transfer through a recirculated air curtain
… of the initial turbulence intensity on the transfer of heat and moisture across a recirculated air curtain. The control of the turbulence intensity at the nozzle exit of an air curtain permits control of heat and moisture transfer and therefore the energy required to operate the air …
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Experimental apparatus for measuring moisture transfer in porous materials subject to relative humidity and temperature differences
… design was developed of an apparatus to measure moisture transfer in porous materials. The apparatus is to be used to collect data to aid in the development of mathematical models which accurately describe this phenomena. The apparatus consists of dual environmental chambers between which a …
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Design and performance testing of a novel ceiling panel for simultaneous heat and moisture transfer to moderate indoor temperature and relative humidity
… at warm temperatures and reduce the amount of moisture that can be removed from a person’s body, making a person feel warm. On the other hand, low indoor humidity levels can cause health problems such as dry eyes and sore throats. In addition to the comfort implications of improperly …
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MODELLING CRYSTALLIZATION FOULING IN LIQUID-TO-AIR MEMBRANE ENERGY EXCHANGERS
… stream while allowing simultaneous heat and moisture transfer between the streams. However, the membrane of LAMEEs may be subjected to crystallization fouling under some operating conditions which impacts performance. The primary goal of this thesis is to establish a model for LAMEEs that can …
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The development of a quick dry fabric for outdoors garments
… in which each layer contributes a substantial moisture removal function. The process of moisture removal is greatly affected by the surrounding conditions, such as pressure, temperature and humidity. If these quantities are much higher than the inner microclimate, the moisture removal process …
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Volume change behavior of clay soils and the effect on discrete fractures
… conditions. Fractures serve as conduits for moisture transfer, which can lead to substantial shrinking and swelling of the surrounding fracture boundary soils. These volume changes, in turn, affect fracture geometry and moisture transmission rates. A new predictive model, termed the 'Fracture …
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EXPERIMENTAL CHARACTERIZATION OF CRYSTALLIZATION FOULING IN LIQUID-TO-AIR MEMBRANE ENERGY EXCHANGERS
… Unlike conventional heat exchangers that transfer only heat using plates or tubes, LAMEEs use semi-permeable membranes to transfer both heat and moisture between liquid desiccant and air streams, while preventing cross-contamination between the fluids. However, the porous membranes used in …
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Evaluation of Moisture Diffusion Theories in Porous Materials
Moisture transport in building materials is directly responsible for structural damage, as well as poor indoor air quality. For these reasons, the need to understand transfer mechanisms and predict moisture transport through building materials has increased over the last couple of decades. Although …
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An experimental apparatus for the measurement of moisture permeability of building materials
… was built and operated for the measurement of moisture permeability of building materials. The data are for use in resolution of problems associated with moisture buildup in porous building materials. The apparatus is capable of maintaining simultaneous humidity and temperature differences …
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Numerical model for analysis and control of the quality of bulk-stored grain using cold air
… and developed. The model describes heat and mass transfer in two dimensions and it enables heat and mass transfer phenomena that occur in the boundary layers of grain stores to be examined in detail. This is achieved by first establishing the air flow distribution in the grain, and then solving …
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The Analysis of Thermal and Fire Performance of Cementitious Building Components
… conditions. A theoretical analysis of heat and moisture transfer in concrete was made which incorporated the simplifications that energy transfer by convection and diffusion in concrete could be neglected. However, the effect of water evaporation in concrete was considered. The thermal …
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A continuous real-time interactive basin simulator (RIBS)
… of the saturated conductivity with depth. A soil moisture redistribution scheme is incorporated in the model to provide a way of simulating the dynamics of the soil moisture profile during interstorm periods. Also added is the capability of modeling the processes of lateral moisture transfer in …
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Defect correction based domain decomposition methods for some nonlinear problems
… is a 2D single-phase fluid flow with heat transfer where the PHOENICS CFD code is used to run the subdomain computation. The Newton method with a finite difference Jacobian is a reasonable interface solver in coupling these subdomain computations. The final problem is a multiphase heat and …
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Moisture occurrence in roof assemblies containing moisture storing insulation and its impact on the durability of building envelope
Moisture storing insulation such as cellulose has gained a large segment of the residential market, both in new and retrofit construction. Moisture deposited by exfiltration and adsorbed within the envelope reduces the thermal performance of the envelope and favors fungus growth leading to …
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Crash Analysis of Degraded Concrete Containment Structures
… the environmental effect shrinkage, creep, heat transfer, moisture diffusion, and Alkali-Silica Reaction (ASR). Long-term creep and shrinkage of vertical dry cask are modeled using the B4 creep formulation for concrete. The results show that creep and shrinkage does not significantly affect the …
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A new approach to modelling process and building energy flows in manufacturing industry.
… and its surroundings, and convective heat transfer. To validate the use of the IBPT algorithms to model building physics, the results derived by using the IBPT are compared with those derived by using an industry standard trusted building modelling tool called ‘Integrated Environmental …
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Predictive Modeling for Innovative Design Strategies in Moisture Management in Sustainable Building Envelopes and Evaporative Cooling Systems
… isolate esternamente. Diversamente, utilizzare Moisture Reference Years, come suggerito dalle normative e dalla letteratura, non sempre è la scelta più appropriata al fine di accelerare l’esecuzione delle simulazioni, almeno in un clima mediterraneo. La seconda parte di questa tesi si è …