Low and medium temperature solar thermal collector based in innovative materials and improved heat exchange performance

Abstract A low and medium temperature solar thermal collector for economical supply of heat between 40 and 90 °C has been developed. It is based on solar concentrating systems, heat transfer optimization and substitution of metallic materials by plastic ones. The basic concept is the integration of a flat absorber strip inside semicircular reflector channels in contact with heated water without pressurization. This collector is intended to be more efficient and cheaper than what actual commercial collectors usually are so that the access to a clean and renewable energy would be more quickly redeemable and its use more effective during its life cycle, expanding its common application range. The substitution of traditional materials by surface treated Aluminum with TiNOx for the absorber and chromed thermoformed ABS for the reflector simplifies the production and assembly process. The definitive prototype has an aperture area of 0.225 m2. It was tested in Zaragoza (Spain) and the accumulated efficiency was between 41% and 57%, and the instantaneous efficiency reached 98% depending on the weather conditions. As all trials were made in parallel with a commercial collector, in several cases the performance was over the commercial one.

[1]  Saad Mekhilef,et al.  A review on solar energy use in industries , 2011 .

[2]  W. Beckman,et al.  Solar Engineering of Thermal Processes , 1985 .

[3]  Frank Buttinger,et al.  Development of a new flat stationary evacuated CPC-collector for process heat applications , 2010 .

[4]  I. M. D. A. Mancisidor,et al.  European Union's renewable energy sources and energy efficiency policy review: The Spanish perspective , 2009 .

[5]  Klaus Vajen,et al.  On the correlations between collector efficiency factor and material content of parallel flow flat-plate solar collectors , 2004 .

[6]  Jyeshtharaj B. Joshi,et al.  Performance analysis of a novel and cost effective CPC system , 2013 .

[7]  Oscar Cabeza,et al.  Experimental and numerical investigation of a flat-plate solar collector , 2010 .

[8]  A. S. Nafey,et al.  Theoretical and experimental study of a small unit for solar desalination using flashing process , 2007 .

[9]  Alejandro Reyes,et al.  Mushroom dehydration in a hybrid-solar dryer , 2013 .

[10]  Onorio Saro,et al.  Massive Solar-Thermal Collectors: A critical literature review , 2012 .

[11]  Mehmet Kaya,et al.  The relation of collector and storage tank size in solar heating systems , 2012 .

[12]  Fernando Cruz-Peragón,et al.  Characterization of solar flat plate collectors , 2012 .

[13]  N. Molero Villar,et al.  Numerical 3-D heat flux simulations on flat plate solar collectors , 2009 .

[14]  Jalel Labidi,et al.  Integration of a solar thermal system in a dairy process , 2011 .

[15]  Mohanad Alata,et al.  Developing a multipurpose sun tracking system using fuzzy control , 2005 .

[16]  Marc A. Rosen,et al.  Thermal performance of a multiple PCM thermal storage unit for free cooling , 2013 .

[17]  Fernando Hervás Soriano,et al.  EU Research and Innovation (R&I) in renewable energies: The role of the Strategic Energy Technology Plan (SET-Plan) , 2011 .

[18]  Changying Zhao,et al.  A review of solar collectors and thermal energy storage in solar thermal applications , 2013 .

[19]  A. Alemrajabi,et al.  Phase change material for enhancing solar water heater, an experimental approach , 2013 .

[20]  Majdi Hazami,et al.  Parametric and numerical study of a solar system for heating a greenhouse equipped with a buried exchanger , 2013 .

[21]  Behrooz M. Ziapour,et al.  Study of an efficient compact solar water heater , 2013 .

[22]  Shigenao Maruyama,et al.  Theoretical approach of a flat-plate solar collector taking into account the absorption and emission within glass cover layer , 2006 .

[23]  K. K. Matrawy,et al.  Comparison study for three types of solar collectors for water heating , 1997 .

[24]  Moh’d A. Al-Nimr.  A comparison between the steady state performance of particulate and conventional tubeless collectors , 1995 .

[25]  Simon Furbo,et al.  Flow distribution in a solar collector panel with horizontally inclined absorber strips , 2007 .

[26]  Mohan Kolhe,et al.  An experimental platform for heat pipe solar collector testing , 2013 .

[27]  Ali Sayigh,et al.  Comprehensive Renewable Energy , 2012 .

[28]  A. Al-Ghandoor,et al.  Experimental investigation of the performance of five types of solar collectors , 2013 .

[29]  Philip C. Eames,et al.  Correlations for natural convective heat exchange in CPC solar collector cavities determined from experimental measurements , 2012 .

[30]  Antonio Ruiz Celma,et al.  Design, construction and performance testing of a solar dryer for agroindustrial by-products , 2010 .

[31]  Salman Ajib,et al.  Solar thermally driven cooling systems: Some investigation results and perspectives , 2013 .

[32]  Seyfi Şevik,et al.  Design, experimental investigation and analysis of a solar drying system ☆ , 2013 .

[33]  Martin John Atkins,et al.  Integration of solar thermal for improved energy efficiency in low-temperature-pinch industrial processes , 2010 .

[34]  Ruzhu Wang,et al.  Simulation and parameter analysis of a two-stage desiccant cooing/heating system driven by solar air collectors , 2013 .

[35]  A. Al-Ghandoor,et al.  Experimental investigation on the use of water-phase change material storage in conventional solar water heating systems , 2010 .