FAZA O'ZGARUVCHAN MATERIALLARNING SOLISHTIRMA ISSIQLIK SIG’IMI, ISSIQLIK O'TKAZUVCHANLIGINI ANIQLASHNING ODDIY USULI, T-HISTORY USULI

Аннотация

A simple method of determining the melting point, heat of fusion, specific heat and thermal conductivity of phase-change materials (PCMs) is presented. Compared with other methods, such as conventional calorimetric methods, differential thermal analysis and differential scanning calorimetry methods, it has the following salient features: the experimental unit is simple, able to measure the heat of fusion, specific heat and thermal conductivity of several samples of PCMs simultaneously and allows one to observe the phase-change process of each PCM sample. Using the method, the thermophysical properties of various salt hydrates, paraffin and some PCMs developed by us were measured. For the PCMs whose thermophysical properties are available in the literature, our results gave fairly good agreement. The method is especially useful for the selection of lots of candidate PCMs used for the purpose of engineering and for preparing new PCMs. Kalit so’zlar:faza o’zgaruvchan materiallar,erish issiqligi, solishtirma issiqlik sig’imi , issiqlik o'tkazuvchanligi koeffitsienti.