پيشينه دمايي: روشي ساده و ارزان براي تعيين خواص حرارتي مواد تغيير فاز دهنده

T-history: A simple and cost effective method for determining thermal properties of phase change materials (PCMs)

گرماي نهان مقدار قابل توجهي انرژي است كه هنگام تغيير فاز در جسم ذخيره و يا آزاد مي شود. براي طراحي فرايندهاي مبتني بر تغيير فاز لازم است خواص حرارتي مواد تغيير فاز دهنده در دو حالت مايع و جامد تعيين شود. در اين پژوهش از روش كم هزينه پيشينه دمايي براي تعيين خواص حرارتي استفاده شده است. گرماهاي نهان و دماي ذوب / انجماد و ظرفيت گرمايي ويژه ماده تغيير فاز دهنده پلي اتيلن گليكول 6000 با استفاده از روش پيشينه دمايي اندازه گيري و داده هاي بدست آمده با نتايج حاصل از دستگاه DSC مقايسه شده است. با تعيين دقيق نقاط شكست نمودار، داده هاي بدست آمده از روش پيشينه دمايي باخطاي ناچيز و قابل قبولي به داده هاي حاصل از DSC نزديك بودند.

Latent heat is an enormous amount of energy, which can be stored or released in materials during phase change. For designing of processes upon on phase change, it is necessary to determine thermal properties of phase change materials (PCMs) in both solid and liquid phases. In this research thermal properties of polyethylene glycol have been investigated. T-history, a low cost method, has been offered for measuring thermal properties. Latent heats and temperature range of solidification and melting and specific heat of poly ethylene glycol 6000 have been measured by T-history method and the results were compared with DSC results. Trough precise determination of the breaking points of t-history graph, T-history results for thermal Properties were close enough to the DSC data with an acceptable error.Latent heat is an enormous amount of energy, which can be stored or released in materials during phase change. For designing of processes upon on phase change, it is necessary to determine thermal properties of phase change materials (PCMs) in both solid and liquid phases. In this research thermal properties of polyethylene glycol have been investigated. T-history, a low cost method, has been offered for measuring thermal properties. Latent heats and temperature range of solidification and melting and specific heat of poly ethylene glycol 6000 have been measured by T-history method and the results were compared with DSC results. Trough precise determination of the breaking points of t-history graph, T-history results for thermal Properties were close enough to the DSC data with an acceptable error.