Search Results

You are looking at 1 - 10 of 3,440 items :

  • " phase change" x
Clear All

From phase-change materials to thermoelectrics? Matthias N. SchneiderI, Tobias RosenthalI, Christian StieweII and Oliver Oeckler*, I I Department of Chemistry, Ludwig Maximilian University Munich, Butenandtstraße 513 (D), 81377 Munich, Germany II German Aerospace Center, Linder Höhe, 51147 Cologne, Germany Dedicated to Professor Peter Klüfers on the occasion of his 60th birthday Received August 2, 2010; accepted August 13, 2010 Thermoelectrics / Phase-change materials / Tellurides / Nanostructuring Abstract. Metastable tellurides play an important role as phase-change

-optics organic polymers [ 78 ], 2D materials [ 79 ], phase-transition materials [ 80 ], noble metals [ 81 ], and semiconductors [ 82 ]. Amongst existing approaches, the integration of phase-change materials (PCMs), specially chalcogenide alloys, with nanophotonic platforms offers the most promising path to reconfigurable optical functionalities. This stems from a unique property of chalcogenide PCMs that allows for reliable and repeatable switching of its optical/electrical attributes over billions of switching cycles. The most critical concern for the realization of fully

1 Introduction The recent trend of worldwide energy consumption suggests that buildings consume about 27% of total energy (Parameshwaran et al. 2012). The increased energy demand has resulted in a rise in cost of energy and increased environmental problems. The high cost of energy and environmental problems have aroused the quest for new technologies to avert the growing concern about the eminent energy shortage. The storage of latent heat using phase change materials (PCMs) has emerged as one of the attractive alternatives for load reduction in buildings. The

Volume 4, Issue 3 2009 Article 8 Chemical Product and Process Modeling CHEMECA 2008 A Theoretical Investigation into Phase Change Clothing Benefits for Firefighters under Extreme Conditions Geoffry N. Mercer, University of New South Wales Harvinder S. Sidhu, University of New South Wales at the Australian Defence Force Academy Recommended Citation: Mercer, Geoffry N. and Sidhu, Harvinder S. (2009) "A Theoretical Investigation into Phase Change Clothing Benefits for Firefighters under Extreme Conditions," Chemical Product and Process Modeling: Vol. 4: Iss. 3

1 Introduction Phase change materials (PCMs) are a group of functional materials that support the same purpose as a function of temperature with intrinsic capability of absorbing, storing and releasing thermal energy in form of latent heat known as enthalpy of fusion [ 1 , 2 , 3 ], during phase transition cycles at their operating temperatures under isothermal conditions. In general, PCMs are distinguished according to the phase change they undergo at a particular temperature level and are classified based on their physical transformation of absorbing/storing or

Applications . John Wiley & Sons, Chichester. Hawes, D. W. – Feldman, D. (1992) Absorption of phase change materials in concrete . In: Solar Energy Mater Solar Cells, pp. 91-101. Lane, G. A. – Glew, D. N. – Clark, E. C. et al. (1975) Heat of fusion system for solar energy storage subsystems for the heating and cooling of buildings . Charlottesville, Virginia, USA. Lane, G. A. (1976) Encapsulation of heat of fusion storage materials . In: Proceedings of 2nd Southeastern Conference on Application of Solar Energy, pp. 442-450. Lane, G. A. (1980) Low temperature heat storage

:// [4] Pakere I., Blumberga D. Solar Energy in Low Temperature District Heating. Environmental and Climate Technologies 2019:23(3):147–158. [5] Weiss W., Biermayr P. Potential of Solar Thermal in Europe. Brussels: ESTIF, 2008. [6] Hansen K., Vad Mathiesen B. Comprehensive assessment of the role and potential for solar thermal in future energy systems. Solar Energy 2018:169:144–152. [7] Zalba B., et al. Review on thermal energy storage with phase change: materials, heat

1 Introduction Energy storage is a hot research topic in recent years. In particular, phase-change thermal storage technology is an important technology that makes rational and effective use of existing energy, optimizes the use of renewable energy and enhances energy efficiency ( 1 , 2 ). Phase change thermal storage materials use the latent heat of phase change to achieve the energy storage and utilization ( 3 , 4 ). The realization of phase change energy storage technology relies on phase change materials (PCMs). PCM is a kind of material which can change its

References [1] Domański, R., Magazynowanie energii cieplnej , 1990. [2] Banaszek, J., Domański, R., Rebow, M., El-Sagier, F., Experimental study of solid–liquid phase change in a spiral thermal energy storage unit , Applied Thermal Engineering, Vol. 19, Iss. 12, pp. 1253-1277, 1999. [3] Mehling, H., Cabeza, L. F., Heat and cold storage with PCM , 2008. [4] Jaworski, M., Thermal performance of heat spreader for electronics cooling with incorporated phase change material , Applied Thermal Engineering, October 2011. [5] Sharma, R. K., Ganesan, P.,Tyagi, V. V

1 Introduction The increasing level of carbon emissions, energy demand and fossil fuels limitations also high cost of energy are the main reasons to improve the performance of thermal energy storage system. Therefore, efficient and economical solar heat storage is a most important factor in the utilization of solar energy. Phase change materials (PCMs) proved to have a great potential to use in solar energy storage system. Exergy loss always exists in any heat transfer process like thermal storage systems, so the target is to find the method to reduce the system