Topic
Latent heat
About: Latent heat is a research topic. Over the lifetime, 13503 publications have been published within this topic receiving 302811 citations.
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TL;DR: In this paper, a review on the cooling effect due to the evapotranspiration process of green roofs is presented, where the main experimental results available in literature, the physical-mathematical models and the dynamic simulation software used for the evaluation of the latent heat flux are also analysed and discussed among the available literature.
112 citations
Abstract: In electrical or thermal appliances, heat (thermal energy) must either be added into or removed from a system to maintain operational stability. Heat pipes can enhance the heat transfer capabilities without needing a significant temperature gradient between heat sources and heat sinks. The effectiveness of heat pipes is due to the latent heat of phase change of the working fluid within (i) condensation and (ii) evaporation stages. The latent heat of phase change greatly exceeds the sensible heat capacity. Heat pipes may rely on gravity, wicks, centrifugal force or in some cases even a magnetic field to help return condensate flow from the condenser to the evaporator. Wicks in heat pipes are classified into three groups: sintered, groove and mesh types. This review attempts to cover various types of heat pipes such as thermal diodes, variable conductance, pulsating, etc. The application of nanotechnology in heat pipes can be separated into two groups: nanoparticles and nanobubbles, with the latter receiving considerably less attention than the former. The hybridisation of heat pipe technology is also possible and has been discussed along with its future research potential.
112 citations
TL;DR: In this article, a metal PCM with refractory metallic shells was proposed, which can work at temperature up to 1000 degrees C. The latent heat density of as-prepared capsules is up to 75% of the theoretical value (about 71 J/g) at the melting temperature of 1077 degrees C and the thermal resistance of chromium-nickel layer is 8.27 x 10(-6) m(2) k/w.
112 citations
TL;DR: The methods used to measure the heat capacities and an overview of the experimental and theoretical results obtained for sodium and aluminum clusters are provided.
Abstract: Recent developments allow heat capacities to be measured for size-selected clusters isolated in the gas phase. For clusters with tens to hundreds of atoms, the heat capacities determined as a function of temperature usually have a single peak attributed to a melting transition. The melting temperatures and latent heats show large size-dependent fluctuations. In some cases, the melting temperatures change by hundreds of degrees with the addition of a single atom. Theory has played a critical role in understanding the origin of the size-dependent fluctuations, and in understanding the properties of the liquid-like and solid-like states. In some cases, the heat capacities have extra features (an additional peak or a dip) that reveal a more complex behavior than simple melting. In this article we provide a description of the methods used to measure the heat capacities and provide an overview of the experimental and theoretical results obtained for sodium and aluminum clusters.
112 citations
TL;DR: In this paper, the authors proposed a simple method that eliminates both problems and results in a fast, robust procedure that uses less computation time for the same level of prediction accuracy when compared to other finite-difference schemes.
112 citations