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N.W. Hale

Bio: N.W. Hale is an academic researcher from Purdue University. The author has contributed to research in topics: Thermal energy storage & Convective heat transfer. The author has an hindex of 1, co-authored 1 publications receiving 104 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the phase-change boundary motion of n-octadecane has been studied experimentally and analytically in a rectangular test cell suitable for photographic observations.

105 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the phase change problem has been formulated using pure conduction approach but the problem has moved to a different level of complexity with added convection in the melt being accounted for, which makes it difficult for comparison to be made to assess the suitability of PCMs to particular applications.
Abstract: This paper reviews the development of latent heat thermal energy storage systems studied detailing various phase change materials (PCMs) investigated over the last three decades, the heat transfer and enhancement techniques employed in PCMs to effectively charge and discharge latent heat energy and the formulation of the phase change problem. It also examines the geometry and configurations of PCM containers and a series of numerical and experimental tests undertaken to assess the effects of parameters such as the inlet temperature and the mass flow rate of the heat transfer fluid (HTF). It is concluded that most of the phase change problems have been carried out at temperature ranges between 0 °C and 60 °C suitable for domestic heating applications. In terms of problem formulation, the common approach has been the use of enthalpy formulation. Heat transfer in the phase change problem was previously formulated using pure conduction approach but the problem has moved to a different level of complexity with added convection in the melt being accounted for. There is no standard method (such as British Standards or EU standards) developed to test for PCMs, making it difficult for comparison to be made to assess the suitability of PCMs to particular applications. A unified platform such as British Standards, EU standards needs to be developed to ensure same or similar procedure and analysis (performance curves) to allow comparison and knowledge gained from one test to be applied to another.

1,630 citations

Journal ArticleDOI
TL;DR: In this article, the development of available thermal energy storage (TES) technologies and their individual pros and cons for space and water heating applications are reviewed and compared for low temperature applications, where water is used as a storage medium.

1,156 citations

Journal ArticleDOI
TL;DR: In this article, a detailed review is reported for thermal stability of different groups of phase change materials (PCMs) used in the latent heat energy storage system, including organic (paraffins and non-paraffin), inorganic (salt hydrates and metallics) and eutectics (organic eutectorics and inorganic eUTectics).
Abstract: Successful utilization of the latent heat energy storage system depends considerably on the thermal reliability and stability of the phase change materials (PCMs) used. Thermal stability of phase change material can be established by measuring the thermo-physical properties of the PCM after a number of repeated thermal cycles. A comprehensive knowledge of thermal stability of the PCMs as functions of number of repeated thermal cycles is essential to ensure the long-term performance and economic feasibility of the latent heat storage systems. In this paper, a detailed review is reported for thermal stability of different groups of PCMs. The PCMs are categorized as organic (paraffins and non-paraffins), inorganic (salt hydrates and metallics) and eutectics (organic eutectics and inorganic eutectics). Further, a broad database of different PCMs is developed for which thermal cycling tests were carried out by different researchers and reported in the literature. Some conclusions are derived after critical evaluation of thermal stability of different groups of PCMs. This review will assist to identify the most reliable PCM to be used for a particular application of latent heat energy storage system.

550 citations

Journal ArticleDOI
TL;DR: In this paper, the process of phase change material (PCM) melting in a heat storage unit with internal fins open to air at its top is explored numerically, and the results show how the transient phase change process, expressed in terms of the volume melt fraction of the PCM, depends on the thermal and geometrical parameters of the system, which relate to the temperature difference between the base and the mean melting temperature, and to the thickness and height of the fins.

351 citations

Journal ArticleDOI
TL;DR: In this paper, phase change materials (PCMs) are used in domestic hot water tanks (HWT) and transpired solar collector (TSC) using water/air as the heat transfer media.

241 citations