Latent heat-storage materials

Tun bilek, K., Sari, A., Tarhan, S., Ergunes, G., and Kaygusuz, K., 2005, Laurie and palmitic acids eutectic mixture as latent heat storage material for low temperature heating applications, Energy 30 677—692. 

As Figure 102 shows, heat can be supplied or extracted from a latent heat storage material without significant temperature change. PCM can therefore be applied to stabilize the temperature in an application, for example the indoor temperature in a building or the temperature of the interior of transport boxes. 

Hatade, Y. Yoshida, M. Manufacture of microcapsules capable of encapsulating latent heat storage materials in high concentrations. JP 2007244935, 2007. 

PCM are important, because they are latent heat storage materials suitable for the construction industry as low-energy alternatives to air-conditioning systems. Indeed, a material series made of wax entrapped into microcapsules of acrylic glass (Micronal) and integrated in conventional construction materials such as gypsum plaster is already commercialized by BASF. ... 

Materials used in latent heat storage are known as phase change materials (PCM). The requirements for a PCM to be used as latent heat storage material are... 

Sharma, S.D. Buddhi, D. Sawhney, R.L. Accelerated thermal cycle test of latent heat-storage materials. Sol Energ 66 (1999) 483-490. 

Another construction is presented in Figure 14.48 [178,214]. This dryer has a collector 2 with a latent heat storage material (CaClj-bHjO) as absorber 4. Two additional latent heat storage plates are applied [5] that are pulled out from the covering of the collector and are directly irradiated in daytime. The southern walls, including the wall of the chimney, are made of transparent material the northern wall and the bottom 6 are insulated. The material to be dried is arranged on trays 7 in the drying chamber 1 and partially irradiated. 

There are three types of heat storage sensible, latent and chemical reaction heat storage. Latent heat storage is the most important way of storing heat, and is also called phase change heat storage . Latent heat-storage materials have been widely used for about 40 years. 

The US National Aeronautics and Space Administration (NASA) accelerated the application research of latent heat-storage materials for the space laboratory in the 1960s. They were used to improve the protection of instruments and astronauts against extreme fluctuations in temperature in... 

Latent heat-storage materials are also called phase change materials (PCM). PCM can absorb or release heat with a slight temperature change. PCM may be repeatedly converted between solid and liquid phases to utilize their latent heat of fusion to absorb, store and release heat or cold during such phase conversions. The latent heats of fusion are greater than the sensible heat capacities of the materials. 

Cabeza, L.F., Roca, J., Noguee, M., Melding H., and Hiebler, S., 2005, Long term immersion corrosion tests on metal-PCM pairs used for latent heat storage in the 24 to 29 8 °C temperature range, Materials and Corrosion 56 33—38. 

The method of latent heat storage based on liquid-solid phase transition is available to make smaller the volume of heat storage tank, because of its higher thermal density than that of sensible heat storage. Therefore, a substance which has a large amount of latent heat of fusion is more profitable as a heat storage material. 

A charging fluid heats the phase changing material, which may initially be at a subcooled temperature Tsc, and may eventually reach a temperature 7 sh after sensible heating. Therefore, the latent heat storage system undergoes a temperature difference of 7 sh 7 sc, as shown in Figure 5.19. Heat available for storage would be... 

The thermoeconomics of the latent heat storage system involves fixed capital investment, operational and maintenance cost, and exergy costs. The total fixed capital investment consists of (i) direct expenses, which are equipment cost, materials, and labor, (ii) indirect project expenses, which are freight, insurance, taxes, construction, and overhead, (iii) contingency and contractor fees, and (iv) auxiliary facilities, such as site development and auxiliary buildings. Table 5.7a shows the data used in the thermoeconomic analysis. 

Phase-change material technology utilizes encapsulated latent heat storage units, the core of which can absorb or emit heat when it changes from the solid to the liquid state and vice versa (Figure 60.21). 

He, Q., Zhang, W. (2001), A study on latent heat storage exchangers with the high-temperature phase-change material, International Journal of Energy Research, 25, 331 1. 

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