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Enhanced Thermal Performance of Roofing Materials by Integrating Phase Change Materials to Reduce Energy Consumption in Buildings

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Journal of Renewable Materials 2021年第3期9卷 495-506页

作者： chanita mano Atthakorn Thongtha Department of Physics Faculty of ScienceNaresuan UniversityPhitsanulok65000Thailand

This work focused on characterizing and improving the thermal behavior of metal sheet *** decrease the heat transfer from the roof into a building,we investigated the efficiency of four types of phase change materials,with different melting points:PCMІ,PCM II,PCM III and PCM IV,when used in conjunction with a sheet metal *** exterior metal roofing surface temperature was held constant at 50℃,60℃,70℃and 80℃,using a thermal source(halogen lights)for 360 min to investigate and compare the thermal performance of the metal sheet roofing with and without phase change materials for each *** thermal behaviors of the phase change materials were analyzed by differential scanning calorimeter(DSC).The results showed the melting points of PCMІ,PCM II,PCM III and PCM IV were around 45℃,50℃,55℃and 59℃,*** integration of PCM IV into the metal roofing sheet increased the thermal performance by reducing the room temperature up to 2.8%,1.4%,1.0%and 0.7%when compared with the normal metal roof sheet,at the controlled temperatures of 50℃,60℃,70℃and 80℃,*** thermal absorption of the phase change materials also caused a time delay in the model room reaching a steady *** integration of phase change materials with metal roofing sheets resulted in better thermal performance and conservation of electrical energy by reducing the demand for cooling.

关键词： Roof metal sheets phase change materials energy saving thermal storage building materials

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Competition between Liquid-liquid De-mixing, Crystallization, and Glass Transition in Solutions of PLA of Different Stereochemistry and DEET

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Chinese Journal of Polymer Science 2020年第2期38卷 174-178,I0007页

作者： chanita Sungkapreecha Walter WFocke Rene Androsch Interdisciplinary Center for Transfer-oriented Research in Natural Sciences Martin Luther University Halle-Wittenberg06099 Halle/SaaleGermany University of Pretoria Institute for Sustainable Malaria Control and MRC Collaborating Centre for Malaria Research Department of Chemical EngineeringUniversity of PretoriaPrivate Bag X20Hatfield 0028South Africa

Liquid-liquid(L-L)de-mixing and vitrification of solutions of either crystallizable poly(L-lactic acid)(PLLA)or non-crystallizable poly(D/L-lactic acid)(PDLLA)with 50 m%N,N-diethyl-3-methylbenzamide(DEET)were analyzed by calorimetry and cloud-point measurements,which allows drawing conclusions about the effect of polymer stereochemistry on the phase *** of the PLA stereochemistry,vitrification of the solutions on fast cooling,hindering crystallization of PLLA,occurred below-20℃ and suppressed prior L-L *** experimental results prove that crystallization in samples containing crystallizable PLLA,observed at around 55℃ on slow cooling,is not preceded by L-L de-mixing.

关键词： Crystallization PLA DEET Liquid-liquid phase separation Thermally-induced phase separation(TIPS)

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Antifungal and cytotoxic substances from the stem barks of Desmos chinensis

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Chinese Chemical Letters 2012年第5期23卷 587-590页

作者： Monchanok Tuntipaleepun Suda Chakthong chanita Ponglimanont Patimaporn Plodpai Supayang P.Voravuthikunchai Department of Chemistry Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90112Thailand Natural Products Research Center Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90112Thailand Department of Microbiology Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90112Thailand

Isounonal-7-methyl ether（1） and chinendihydrochalcone（2） together with 8 known compounds were isolated from the stem barks of Desmos *** structures were determined on the basis of spectroscopic *** 2 exhibited cytotoxic activity against MOLT-3 cancer cell line（IC_（50） 7.16μg/mL） and antifungal activity against Pyricularia oryzae and Rhizoctonia solani with MIC values of 15.6 and 31.2μg/mL,respectively.

关键词： Dihydrochalcone Desmos chinensis Cytotoxic activity Antifungal activity

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