Research On Assessment Model System Of Dynamic Thermal Comfort With PCM Dresses

The PCM(Phase Change Materials) can absorb heat or release lots of latent heat, when they change their phases, but the temperature within them does not change. For that property, the PCM can be prepared by micro-encapsulation and added into the textile, and then, a kind of good thermal comfort dresses(PCM dresses) with heat preservation and thermal insulation can be made. At present, there are all sorts of PCM dresses in the market, but no evaluation criterion or method on thermal comfort emerges. So, establishing assessment model systems of thermal comfort for PCM dresses and developing the CAD system for PCM costume designing have rather good reference significance and practice applied value for helping PCM dresses designing and consumer selection.This dissertation is written based on many articles from home and abroad, and an assessment model system of dynamic thermal comfort with human-in-PCM dresses has been initially established, mainly on the thought of 'taking humans as essentials'. The major work of this dissertation is: (1) Joint human model, clothing-environmental model with heat and mass transfer, and DTS(dynamic thermal sensation) model to establish an assessment model system of dynamic thermal comfort with human-PCM clothes-environment. Compare the model's simulation results with the experiments' results made by other researchers aboard under the same experiment's condition to make sure the availability and precision of that novel model system. Then, using that newly-established model system to simulate and compare the different comfort results of human wearing clothes with different PCM contents, including clothes with PCM content of 0%. (2) About the assessment methods, we added a kind of fuzzy reasoning approach into dynamic thermal comfort with human-in-clothes to establish a more novel model.The main conclusions of this dissertation are as follows: (1) The assessment method developed in this novel assessment model system of dynamic thermal comfort with human-in-clothes and environment is different from some traditional ones, because, the basic factors of costume such as the fiber, the property and content of PCM can be take into consideration. So, the thermal comfort can be obtained by changing the basic factors of costume in the model system. After we validated, the precision of the model is satisfactory. Besides, the results of simulation and prediction show that the comfort of human in PCM clothes is better than that of human in common clothes, furthermore, within certain limits, the more content of the PCM the clothes contains, the more comfortable the human is. (2) Further enriched and developed the assessment model system of dynamic thermal comfort with human-in-clothes and environment by using fuzzy reasoning approach, and predicted a reasonable variation trend of dynamic thermal sensation.This disertation is supported by the National Natural Science Foundation of China(No.50706017) and NUAA Research Funding(NS2010009).