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Abstract  

A method was devised to evaluate latent heats of vaporization from quasi-isothermal isobaric analysis data. The procedure requires the recording of at least two diagrams: one for the investigated liquid, and the other for a standard liquid with a known latent heat of vaporization. Use of the method to determine the heats of vaporization of some alcohols, with water as standard liquid, led to results close to those previously reported in the literature. The main advantage of the procedure consists in the fact that it requires only small amounts of sample (5–10 mg).

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Owing to their high specific melting enthalpy and the range of the melting temperatures the alkaline-earth hydroxide hydrates Ba(OH)2·8H2O and Sr(OH)2·8H2O are promising latent heat storage materials.

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The thermal behaviour of sodium acetate trihydrate (NaAc · 3H2O) was investigated by DTA, Q-TG and measurements of the solubility properties. The nucleation efficiency of Na4P2O7 · 10H2O for the crystallization of NaAc · 3H2O melts is not stable over long periods. Stratification can be ascribed to the formation of anhydrous sodium acetate in the supercooled melts. Under static heat storage conditions, NaAc · 3H2O and Na4P2O7 · 10H2O do not exhibit stable behaviour.

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850 71.0 1.3 2.0 Utilizing the latent heat of melting to make power is a possible kind of storage energy manner, especially for

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numerical analysis of welding processes [ 5 , 8 , 9 , 15 , 16 ]. However, latent heat generated during phase transformations in heat treatment of steel influences temperature distribution and has a significant effect on numerically predicted

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 Particle size/μm Expansion ratio/mL g −1 Thermal conductivity/W m −1 K −1 Melting point/°C Latent heat/J g −1

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References [1] Soares N. , et al. ( 2012 ), Review of passive PCM latent heat thermal energy storage systems towards

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Introduction Thermal energy storage (TES) is utilized in energy recovery and conservation processes and for solar thermal systems [ 1 – 3 ]. Of various TES methods, latent heat thermal energy storage (LHTES) is one of the most

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