دانلود رایگان مقاله لاتین کلکتور حرارتی از سایت الزویر
عنوان فارسی مقاله:
مطالعه عددی و تجربی از یک کلکتور حرارتی چین دار
عنوان انگلیسی مقاله:
Numerical and experimental study of a corrugated thermal collector
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
The energy that a society consumes and its use and transformation effectiveness are criteria that characterize the development degree of a country. In fact correlations between the energy consume and the life quality levels have been defined and reported [1]. The development of the welfare society progress in parallel with the increasing energy consumption; for instance, the eighteenth century energy consumption per person was estimated about 3 kW h per day in buildings while nowadays is approximately 350 kW h per day in buildings, according to González [2]. This increasing consumption is causing sustainability, environmental, social and political problems. The described situation obviously requires corrective actions. Accordingly, the European Union has set a target for 2020 to reach the objective 20–20–20 (20% emissions reduction, 20% of energy provided by renewable energies, and 20% for saving energy). Focusing in an illustrative case, Spain is a paradigmatic example. In fact, this country is completely dependent on energy supply from abroad, importing the 75.6% of total consumption [3]. For correcting this, a contribution of renewable energy to gross final consumption of about 22.7% is expected to reach in 2020 [4]. Therefore, for achieving these objectives the design of increasingly efficient renewable devices in buildings as solar collectors isneeded. Accordingly, the aim of this work is the proposal of a new solar thermal corrugated collector with parallel configuration for buildings that improves other commercial panel efficiency. The tube and plate absorbers have been studied by analytical methods by several authors [5–8]. The study of Hottel and Woertz is a pioneer work in the field [5]. Duffie and Beckman [6] presented the theory of flat-plate and concentrating collectors relating this topic with solar process economics and solar heating design. Eisenmann et al. [7] focuses on the correlations between the efficiency factor and the material content of absorber and tubing for flat-plate collectors with the fin-and-tube geometry, and Eismann and Prasser [8] calculated the efficiency of non-ideal absorbers using two-dimensional simulations and proposed new correlation for the fin efficiency to provide accurate efficiency/cost optimization. Moreover, numerical analysis is nowadays an essential tool to evaluate these types of devices [9–20]. Namely, in [9] block-oriented simulation technique was applied to obtain the solution of the dynamic model performed to describe the thermal behavior of solar collectors, while in [10] new transfer functions based on a validated collector model were performed to control collectors used in domestic applications. In these studies, mathematical models are developed to simulate numerically the collector performance using Matlab and FEM. The numerical simulation permits to know the collector yields without performing additional experimental tests. It is indispensable to predict the collector performance under a wide variety of conditions, in different operating scenarios. In addition, in the most of these works the simulations have been validated by experimental measurements.
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کلمات کلیدی:
Numerical and experimental study of a corrugated thermal collector www.sciencedirect.com/science/article/pii/S2214157X16300132 by A Álvarez - 2016 - Cited by 1 - Related articles Apr 29, 2016 - The present work proposes a design for solar thermal collectors and also a numerical simulation analysis procedure to evaluate the collector ... Numerically assisted analysis of flat and corrugated ... - Science Direct www.sciencedirect.com/science/article/pii/S0038092X12001867 by D Dović - 2012 - Cited by 34 - Related articles Jun 14, 2012 - Still, there is an interest for further increase of collector thermal efficiency and optimization of the design. Such development and optimization ... Energy modeling of photovoltaic thermal systems with corrugated ... www.sciencedirect.com/science/article/pii/S0038092X14000085 by S Li - 2014 - Cited by 20 - Related articles Feb 10, 2014 - Developed energy models for UTCs and UTCs with PV/T. Developed Nu number and effectiveness correlations using validated CFD simulations. ... Building-integrated photovoltaic–thermal (BIPV/T) systems with unglazed transpired solar collectors (UTCs) can provide a key solution for on ... [PDF]Mathematical modelling and analysis of corrugated ... - SSRG Journals www.internationaljournalssrg.org/IJIE/2016/Special-Issues/.../IJIE-ICEIET-P101.pdf carried out on corrugated absorber plate. It will increase the heat transfer rate. Improvement of thermal efficiency of solar flat plate collector is to be obtained by ... [PDF]Experimental Investigation of the Transpired Solar Air Collectors and ... www.mdpi.com/1996-1073/10/3/302/pdf by W Zheng - 2017 Mar 3, 2017 - perforating corrugated plate were a little larger than the collectors with ... Keywords: solar air collector; cold and severe cold regions; thermal ...
