A Numerical and Experimental Study of Heat and Moisture Transfer With Phase Change and Mobile Condensates in Fibrous Insulation

2003 ◽  
Author(s):  
Jintu Fan ◽  
Xiaoyin Cheng
Keyword(s):  
Phase Change ◽  
Moisture Absorption ◽  
Moisture Transfer ◽  
Water Vapor Pressure ◽  
Heat And Moisture Transfer ◽  
Moisture Movement ◽  
Saturation State ◽  
New Model ◽  
Fibrous Insulation ◽  
Heat And Moisture

This paper reports on an improved model of coupled heat and moisture transfer with phase change and mobile condensates in fibrous insulation. The new model considered the moisture movement induced by the partial water vapor pressure, a super saturation state in condensing region as well as the dynamic moisture absorption of fibrous materials and the movement of liquid condensates. The results of the new model were compared and found in good agreement with the experimental ones. Numerical simulation was carried using the model to investigate the effect of various material parameters on the transport phenomena.

NUMERICAL SIMULATION FOR EFFECTS OF MICROCAPSULED PHASE CHANGE MATERIAL (MPCM) DISTRIBUTION ON HEAT AND MOISTURE TRANSFER IN POROUS TEXTILES

2009 ◽  
Vol 23 (03) ◽  
pp. 501-504 ◽  
Author(s):  
FENGZHI LI
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Phase Change Materials ◽  
Moisture Transfer ◽  
Physical Parameters ◽  
Heat And Moisture Transfer ◽  
Numerical Predictions ◽  
Coupled Heat And Moisture ◽  
Heat And Moisture ◽  
Transfer Properties

In recent years, the use of phase change materials (PCM) to improve heat and moisture transfer properties of clothing has gained considerable attention. The PCM distribution in the clothing impacts heat and moisture transfer properties of the clothing significantly. For describing the mechanisms of heat and moisture transfer in clothing with PCM and investigating the effect of the PCM distribution, a new dynamic model of coupled heat and moisture transfer in porous textiles with PCM was developed. The effect of water content on physical parameters of textiles and heat transfer with phase change in the PCM microcapsules were considered in the model. Meanwhile, the numerical predictions were compared with experimental data, and good agreement was observed between the two, indicating that the model was satisfactory. Also the effects of the PCM distribution on heat transfer in the textiles-PCM microcapsule composites were investigated by using the model.

Numerical Simulation of Heat and Moisture Transfer in System of Human-Clothing with Phase Change Materials-Environment

2011 ◽  
Vol 88-89 ◽  
pp. 470-474
Author(s):  
Feng Zhi Li ◽  
Peng Fei Wang ◽  
Yi Li
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Phase Change ◽  
Skin Temperature ◽  
Phase Change Materials ◽  
Moisture Transfer ◽  
Heat And Moisture Transfer ◽  
Model Predictions ◽  
Coupled Heat And Moisture ◽  
Heat And Moisture

A model of heat and moisture transfer in human-clothing with PCM-environment system is developed. In the model, the improved 25-node model is used for simulating human thermo- regulation, and the coupled heat and moisture model is applied to the PCM’s clothing. The model predictions and experimental data are compared. Also, the influences of the PCM on human skin temperature and sweat accumulation are predicted. The results are helpful to design of thermal functional clothing.

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