Performance analysis of Parabolic Trough Collectors with Double Glass Envelope

In this work, the performance of Parabolic Trough Collectors (PTCs) with Double Glass Envelope (DGE) is studied. A one-dimensional model comprising optical and thermal analyses is developed. The effect of an Inner Glass Envelope (IGE), thermal emittance of the envelopes, and vacuum conditions in the...

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Tipo de recurso:
Fecha de publicación:
2018
Institución:
Universidad de Medellín
Repositorio:
Repositorio UDEM
Idioma:
eng
OAI Identifier:
oai:repository.udem.edu.co:11407/4841
Acceso en línea:
http://hdl.handle.net/11407/4841
Palabra clave:
Double Glass Envelope (DGE)
Efficiency
Parabolic Trough Collector (PTC)
Solar irradiance
Thermal emittance
Thermal losses
Vacuum conditions
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id REPOUDEM2_405490515b7712662ad90ce286a0b84a
oai_identifier_str oai:repository.udem.edu.co:11407/4841
network_acronym_str REPOUDEM2
network_name_str Repositorio UDEM
repository_id_str
dc.title.spa.fl_str_mv Performance analysis of Parabolic Trough Collectors with Double Glass Envelope
title Performance analysis of Parabolic Trough Collectors with Double Glass Envelope
spellingShingle Performance analysis of Parabolic Trough Collectors with Double Glass Envelope
Double Glass Envelope (DGE)
Efficiency
Parabolic Trough Collector (PTC)
Solar irradiance
Thermal emittance
Thermal losses
Vacuum conditions
title_short Performance analysis of Parabolic Trough Collectors with Double Glass Envelope
title_full Performance analysis of Parabolic Trough Collectors with Double Glass Envelope
title_fullStr Performance analysis of Parabolic Trough Collectors with Double Glass Envelope
title_full_unstemmed Performance analysis of Parabolic Trough Collectors with Double Glass Envelope
title_sort Performance analysis of Parabolic Trough Collectors with Double Glass Envelope
dc.contributor.affiliation.spa.fl_str_mv Osorio, J.D., Universidad de Medellín; Ingeniería Térmica Ltda;Rivera-Alvarez, A., Ingeniería Térmica Ltda; Fundación Ergon
dc.subject.spa.fl_str_mv Double Glass Envelope (DGE)
Efficiency
Parabolic Trough Collector (PTC)
Solar irradiance
Thermal emittance
Thermal losses
Vacuum conditions
topic Double Glass Envelope (DGE)
Efficiency
Parabolic Trough Collector (PTC)
Solar irradiance
Thermal emittance
Thermal losses
Vacuum conditions
description In this work, the performance of Parabolic Trough Collectors (PTCs) with Double Glass Envelope (DGE) is studied. A one-dimensional model comprising optical and thermal analyses is developed. The effect of an Inner Glass Envelope (IGE), thermal emittance of the envelopes, and vacuum conditions in the two resulting annuli are analyzed in detail and compared with the performance of a traditional PTC. The incorporation of an additional envelope into a traditional PTC reduces heat losses. At high operating temperatures, the reduction in thermal losses achieved with the DGE PTC leads to a superior efficiency. It is found that an IGE having low emittance values could be used to reduce heat losses and replace the vacuum in conventional PTCs. In addition, in a DGE PTC, vacuum is more important in the annulus between the absorber pipe and the IGE. The effect of solar irradiance on the performance of a DGE PTC is also studied considering clear sky and partially cloudy sky day conditions. In general, higher solar irradiance values favor collectors' efficiency. Finally, the efficiency of a DGE PTC is analyzed considering a commercially architectural glass and a glass for solar applications. The DGE PTC with IGE made of a glass for solar applications exhibits higher performance than a traditional PTC at high temperatures. However, a detailed economic analysis is required in order to determine the total energy cost with the proposed DGE PTC concept. Using a DGE improves the collector efficiency at high temperatures especially during partially cloudy sky days. © 2018 Elsevier Ltd
publishDate 2018
dc.date.accessioned.none.fl_str_mv 2018-10-31T13:09:03Z
dc.date.available.none.fl_str_mv 2018-10-31T13:09:03Z
dc.date.created.none.fl_str_mv 2019
dc.type.eng.fl_str_mv Article
dc.type.coarversion.fl_str_mv http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.coar.fl_str_mv http://purl.org/coar/resource_type/c_6501
http://purl.org/coar/resource_type/c_2df8fbb1
dc.type.driver.none.fl_str_mv info:eu-repo/semantics/article
dc.identifier.issn.none.fl_str_mv 9601481
dc.identifier.uri.none.fl_str_mv http://hdl.handle.net/11407/4841
dc.identifier.doi.none.fl_str_mv 10.1016/j.renene.2018.06.024
identifier_str_mv 9601481
10.1016/j.renene.2018.06.024
url http://hdl.handle.net/11407/4841
dc.language.iso.none.fl_str_mv eng
language eng
dc.relation.isversionof.spa.fl_str_mv https://www.scopus.com/inward/record.uri?eid=2-s2.0-85053207099&doi=10.1016%2fj.renene.2018.06.024&partnerID=40&md5=25163b132cad85c9ef7ba4bd3b552da6
dc.relation.citationvolume.spa.fl_str_mv 130
dc.relation.citationstartpage.spa.fl_str_mv 1092
dc.relation.citationendpage.spa.fl_str_mv 1107
dc.relation.ispartofes.spa.fl_str_mv Renewable Energy
dc.relation.references.spa.fl_str_mv Hafez, A.Z., Attia, A.M., Eltwab, H.S., ElKousy, A.O., Afifi, A.A., AbdElhamid, A.G., AbdElqader, A.N., Ismail, I.M., Design analysis of solar parabolic trough thermal collectors (2018) Renew. Sustain. Energy Rev., 82, pp. 1215-1260;Kumaresan, G., Sudhakar, P., Santosh, R., Velraj, R., Experimental and numerical studies of thermal performance enhancement in the receiver part of solar parabolic trough collectors (2017) Renew. Sustain. Energy Rev., 77, pp. 1363-1374;Sandeep, H.M., Arunachala, U.C., Solar parabolic trough collectors: a review on heat transfer augmentation techniques (2017) Renew. Sustain. Energy Rev., 69, pp. 1218-1231;Daniel, P., Joshi, Y., Das, A.K., Numerical investigation of parabolic trough receiver performance with outer vacuum shell (2011) Sol. Energy, 85 (9), pp. 1910-1914;Jebasingh, V.K., Joselin Herbert, G.M., A review of solar parabolic trough collector (2016) Renew. Sustain. Energy Rev., 54, pp. 1085-1091;Fernández-García, A., Zarza, E., Valenzuela, L., Pérez, M., Parabolic-trough solar collectors and their applications (2010) Renew. Sustain. Energy Rev., 14 (7), pp. 1695-1721;Wu, Y.T., Liu, S.W., Xiong, Y.X., Ma, C.F., Ding, Y.L., Experimental study on the heat transfer characteristics of a low melting point salt in a parabolic trough solar collector system (2015) Appl. Therm. Eng., 89, pp. 748-754;Forristall, R., Heat Transfer Analysis and Modelling of a Parabolic Trough Solar Receiver Implemented in Engineering Equation Solver (2003), National Renewable Energy Laboratory NREL/TP-550e34169;Wu, Z., Li, S., Yuan, G., Lei, D., Wang, Z., Three-dimensional numerical study of heat transfer characteristics of parabolic trough receiver (2014) Appl. Energy, 113, pp. 902-911;Salgado Conrado, L., Rodriguez-Pulido, A., Calderón, G., Thermal performance of parabolic trough solar collectors (2017) Renew. Sustain. Energy Rev., 67, pp. 1345-1359;Chafie, M., Aissa, M.F.B., Guizani, A., Energetic end exergetic performance of a parabolic trough collector receiver: an experimental study (2018) J. Clean. Prod., 171, pp. 285-296;Patil, R.G., Panse, S.V., Joshi, J.B., Optimization of non-evacuated receiver of solar collector having non-uniform temperature distribution for minimum heat loss (2014) Energy Convers. Manag., 85, pp. 70-84;Chandra, Y.P., Singh, A., Mohapatra, S.K., Kesari, J.P., Rana, L., Numerical optimization and convective thermal loss analysis of improved solar parabolic trough collector receiver system with one sided thermal insulation (2017) Sol. Energy, 148, pp. 36-48;Zou, B., Dong, J., Yao, Y., Jiang, Y., A detailed study on the optical performance of parabolic trough solar collectors with Monte Carlo Ray Tracing method based on theoretical analysis (2017) Sol. Energy, 147, pp. 189-201;Guo, J., Huai, X., Liu, Z., Performance investigation of parabolic trough solar receiver (2016) Appl. Therm. Eng., 95, pp. 357-364;Lu, J., Yuan, Q., Ding, J., Wang, W., Liang, J., Experimental studies on nonuniform heat transfer and deformation performances for trough solar receiver (2016) Appl. Therm. Eng., 109, pp. 497-506;Xu, L., Wang, Z., Li, X., Yuan, G., Sun, F., Lei, D., Li, S., A comparison of three test methods for determining the thermal performance of parabolic trough solar collectors (2014) Sol. Energy, 99, pp. 11-27;Cheng, J., Wang, C., Wang, W., Du, X., Liu, Y., Xue, Y., Wang, T., Chen, B., Improvement of thermal stability in the solar selective absorbing Mo-Al2O3 coating (2013) Sol. Energy Mat. Sol. Cells, 109, pp. 204-208;Céspedes, E., Wirz, M., Sánchez-García, J.A., Alvarez-Fraga, L., Escobar-Galindo, R., Prieto, C., Novel Mo-Si3N4 based selective coating for high temperature concentrating solar power applications (2014) Sol. Energy Mat. Sol. Cells, 122, pp. 217-225;Zhang, K., Hao, L., Du, M., Mi, J., Wang, J., Meng, J., A review on thermal stability and high temperature induced ageing mechanisms of solar absorber coatings (2017) Renew. Sustain. Energy Rev., 67, pp. 1282-1299;Navarro-Hermoso, J.L., Espinosa-Rueda, G., Heras, C., Salinas, I., Martinez, N., Gallas, M., Parabolic trough solar receivers characterization using specific test bench for transmittance, absorptance and heat loss simultaneous measurement (2016) Sol. Energy, 136, pp. 268-277;O'Keeffea, G.J., Mitchella, S.L., Myersb, T.G., Cregana, V., Modelling the efficiency of a nanofluid-based direct absorption parabolic trough solar collector (2018) Sol. Energy, 159, pp. 44-54;Kasaeian, A., Daneshazarian, R., Pourfayaz, F., Comparative study of different nanofluids applied in a trough collector with glass-glass absorber tube (2017) J. Mol. Liq., 234, pp. 315-323;Subramani, J., Nagarajan, P.K., Mahian, O., Sathyamurthy, R., Efficiency and heat transfer improvements in a parabolic trough solar collector using TiO2 nanofluids under turbulent flow regime (2018) Renew. Energy, 119, pp. 19-31;Mwesigye, A., Huan, Z., Meyer, J.P., Thermal performance and entropy generation analysis of a high concentration ratio parabolic trough solar collector with Cu-Therminol® VP-1 nanofluid (2016) Energy Convers. Manag., 120, pp. 449-465;Mwesigye, A., Bello-Ochende, T., Meyer, J.P., Heat transfer and thermodynamic performance of a parabolic trough receiver with centrally placed perforated plate inserts (2014) Appl. Energy, 136, pp. 989-1003;Reddy, K.S., Kumar, K.R., Ajay, C.S., Experimental investigation of porous disc enhanced receiver for solar parabolic trough collector (2015) Renew. Energy, 77, pp. 308-319;Fuqiang, W., Qingzhi, L., Huaizhi, H., Jianyu, T., Parabolic trough receiver with corrugated tube for improving heat transfer and thermal deformation characteristics (2016) Appl. Energy, 164, pp. 411-424;Huang, Z., Yu, G.L., Li, Z.Y., Tao, W.Q., Numerical study on heat transfer enhancement in a receiver tube of parabolic trough solar collector with dimples, protrusions and helical fins (2015) Energy Proced., 69, pp. 1306-1316;Osorio, J.D., Rivera-Alvarez, A., Girurugwiro, P., Yang, S., Hovsapian, R., Ordonez, J.C., Integration of transparent insulation materials into solar collector devices (2017) Sol. Energy, 147, pp. 8-21;Wang, Q., Pei, G., Honglun, Y., Munir, A., Mingke, H., Performance study of a parabolic trough solar collector with an inner radiation shield (2016) Bulg. Chem. Commun., 48 (E), pp. 77-87;Wirz, M., Petit, J., Haselbacher, A., Steinfeld, A., Potential improvements in the optical and thermal efficiencies of parabolic trough concentrators (2014) Sol. Energy, 107, pp. 398-414;Zhang, L., Yu, Z., Fan, L., Wang, W., Chen, H., Hu, Y., Fan, J., Cen, K., An experimental investigation of the heat losses of a U-type solar heat pipe receiver of a parabolic trough collector-based natural circulation steam generation system (2013) Renew. Energy, 57, pp. 262-268;Vasquez-Padilla, R., Demirkaya, G., Goswami, D.Y., Stefanakos, E., Rahman, M.M., Heat transfer analysis of parabolic trough solar receiver (2011) Appl. Energy, 88, pp. 5097-5110;Fan, M., Liang, H., You, S., Zhang, H., Zheng, W., Xia, J., Heat transfer analysis of a new volumetric based receiver for parabolic trough solar collector (2018) Energy, 142, pp. 920-931;Dudley, V.E., Kolb, G.J., Sloan, M., Kearney, D., Test Results: SGES LS-2 Solar Collector. Technical Report SAND-94-1884 (1994), Sandia National Laboratory;Duffie, J.A., Beckman, W.A., Solar Engineering of Thermal Processes (2013), fourth ed. Wiley;Incropera, F., DeWitt, D., Bergman, T.L., Lavine, A.S., Fundamentals of Heat and Mass Transfer (2007), sixth ed. John Wiley and Sons New York;Gnielinski, V., New equations for heat and mass transfer in the turbulent flow in pipes and channels (1975) Int. Chem. Eng., 16 (2), pp. 359-363;Ratzel, A., Hickox, C., Gartling, D., Techniques for reducing thermal conduction and natural convection heat losses in annular receiver geometries (1979) J. Heat Transf., 101 (1), pp. 108-113;Marshal, N., Gas Encyclopedia (1976), Elsevier New York;Bejan, A., Convection Heat Transfer (1995), second ed. John Wiley & Sons New York;Giovannetti, F., Föste, S., Ehrmann, N., Rockendorf, G., High transmittance, low emissivity glass covers for flat plate collectors: applications and performance (2014) Sol. Energy, 104, pp. 52-59;Kalogirou, S.A., Solar thermal collectors and applications (2004) Prog. Energy Combust., 30 (3), pp. 231-295;Burkholder, F., Kutscher, C., (2009) Heat Loss Testing of Schott's 2008 PTR70 Parabolic Trough Receiver, , National Renewable Energy Laboratory NREL/TP-550-45633;Lawrence Berkeley National Laboratory (LBNL) (2018), http://windowoptics.lbl.gov/data/igdb, Version 59;Ferrara, M., Castaldo, A., Esposito, S., D'Angelo, A., Guglielmo, A., Antonaia, A., AlN-Ag based low-emission sputtered coatings for high visible transmittance window (2016) Surf. Coating. Technol., 295, pp. 2-7
dc.rights.coar.fl_str_mv http://purl.org/coar/access_right/c_16ec
rights_invalid_str_mv http://purl.org/coar/access_right/c_16ec
dc.publisher.spa.fl_str_mv Elsevier Ltd
dc.publisher.program.spa.fl_str_mv Ingeniería en Energía
dc.publisher.faculty.spa.fl_str_mv Facultad de Ingenierías
dc.source.spa.fl_str_mv Scopus
institution Universidad de Medellín
repository.name.fl_str_mv Repositorio Institucional Universidad de Medellin
repository.mail.fl_str_mv repositorio@udem.edu.co
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spelling 2018-10-31T13:09:03Z2018-10-31T13:09:03Z20199601481http://hdl.handle.net/11407/484110.1016/j.renene.2018.06.024In this work, the performance of Parabolic Trough Collectors (PTCs) with Double Glass Envelope (DGE) is studied. A one-dimensional model comprising optical and thermal analyses is developed. The effect of an Inner Glass Envelope (IGE), thermal emittance of the envelopes, and vacuum conditions in the two resulting annuli are analyzed in detail and compared with the performance of a traditional PTC. The incorporation of an additional envelope into a traditional PTC reduces heat losses. At high operating temperatures, the reduction in thermal losses achieved with the DGE PTC leads to a superior efficiency. It is found that an IGE having low emittance values could be used to reduce heat losses and replace the vacuum in conventional PTCs. In addition, in a DGE PTC, vacuum is more important in the annulus between the absorber pipe and the IGE. The effect of solar irradiance on the performance of a DGE PTC is also studied considering clear sky and partially cloudy sky day conditions. In general, higher solar irradiance values favor collectors' efficiency. Finally, the efficiency of a DGE PTC is analyzed considering a commercially architectural glass and a glass for solar applications. The DGE PTC with IGE made of a glass for solar applications exhibits higher performance than a traditional PTC at high temperatures. However, a detailed economic analysis is required in order to determine the total energy cost with the proposed DGE PTC concept. Using a DGE improves the collector efficiency at high temperatures especially during partially cloudy sky days. © 2018 Elsevier LtdengElsevier LtdIngeniería en EnergíaFacultad de Ingenieríashttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85053207099&doi=10.1016%2fj.renene.2018.06.024&partnerID=40&md5=25163b132cad85c9ef7ba4bd3b552da613010921107Renewable EnergyHafez, A.Z., Attia, A.M., Eltwab, H.S., ElKousy, A.O., Afifi, A.A., AbdElhamid, A.G., AbdElqader, A.N., Ismail, I.M., Design analysis of solar parabolic trough thermal collectors (2018) Renew. Sustain. Energy Rev., 82, pp. 1215-1260;Kumaresan, G., Sudhakar, P., Santosh, R., Velraj, R., Experimental and numerical studies of thermal performance enhancement in the receiver part of solar parabolic trough collectors (2017) Renew. Sustain. Energy Rev., 77, pp. 1363-1374;Sandeep, H.M., Arunachala, U.C., Solar parabolic trough collectors: a review on heat transfer augmentation techniques (2017) Renew. Sustain. Energy Rev., 69, pp. 1218-1231;Daniel, P., Joshi, Y., Das, A.K., Numerical investigation of parabolic trough receiver performance with outer vacuum shell (2011) Sol. Energy, 85 (9), pp. 1910-1914;Jebasingh, V.K., Joselin Herbert, G.M., A review of solar parabolic trough collector (2016) Renew. Sustain. Energy Rev., 54, pp. 1085-1091;Fernández-García, A., Zarza, E., Valenzuela, L., Pérez, M., Parabolic-trough solar collectors and their applications (2010) Renew. Sustain. Energy Rev., 14 (7), pp. 1695-1721;Wu, Y.T., Liu, S.W., Xiong, Y.X., Ma, C.F., Ding, Y.L., Experimental study on the heat transfer characteristics of a low melting point salt in a parabolic trough solar collector system (2015) Appl. Therm. Eng., 89, pp. 748-754;Forristall, R., Heat Transfer Analysis and Modelling of a Parabolic Trough Solar Receiver Implemented in Engineering Equation Solver (2003), National Renewable Energy Laboratory NREL/TP-550e34169;Wu, Z., Li, S., Yuan, G., Lei, D., Wang, Z., Three-dimensional numerical study of heat transfer characteristics of parabolic trough receiver (2014) Appl. Energy, 113, pp. 902-911;Salgado Conrado, L., Rodriguez-Pulido, A., Calderón, G., Thermal performance of parabolic trough solar collectors (2017) Renew. Sustain. Energy Rev., 67, pp. 1345-1359;Chafie, M., Aissa, M.F.B., Guizani, A., Energetic end exergetic performance of a parabolic trough collector receiver: an experimental study (2018) J. Clean. Prod., 171, pp. 285-296;Patil, R.G., Panse, S.V., Joshi, J.B., Optimization of non-evacuated receiver of solar collector having non-uniform temperature distribution for minimum heat loss (2014) Energy Convers. Manag., 85, pp. 70-84;Chandra, Y.P., Singh, A., Mohapatra, S.K., Kesari, J.P., Rana, L., Numerical optimization and convective thermal loss analysis of improved solar parabolic trough collector receiver system with one sided thermal insulation (2017) Sol. Energy, 148, pp. 36-48;Zou, B., Dong, J., Yao, Y., Jiang, Y., A detailed study on the optical performance of parabolic trough solar collectors with Monte Carlo Ray Tracing method based on theoretical analysis (2017) Sol. Energy, 147, pp. 189-201;Guo, J., Huai, X., Liu, Z., Performance investigation of parabolic trough solar receiver (2016) Appl. Therm. Eng., 95, pp. 357-364;Lu, J., Yuan, Q., Ding, J., Wang, W., Liang, J., Experimental studies on nonuniform heat transfer and deformation performances for trough solar receiver (2016) Appl. Therm. Eng., 109, pp. 497-506;Xu, L., Wang, Z., Li, X., Yuan, G., Sun, F., Lei, D., Li, S., A comparison of three test methods for determining the thermal performance of parabolic trough solar collectors (2014) Sol. Energy, 99, pp. 11-27;Cheng, J., Wang, C., Wang, W., Du, X., Liu, Y., Xue, Y., Wang, T., Chen, B., Improvement of thermal stability in the solar selective absorbing Mo-Al2O3 coating (2013) Sol. Energy Mat. Sol. Cells, 109, pp. 204-208;Céspedes, E., Wirz, M., Sánchez-García, J.A., Alvarez-Fraga, L., Escobar-Galindo, R., Prieto, C., Novel Mo-Si3N4 based selective coating for high temperature concentrating solar power applications (2014) Sol. Energy Mat. Sol. Cells, 122, pp. 217-225;Zhang, K., Hao, L., Du, M., Mi, J., Wang, J., Meng, J., A review on thermal stability and high temperature induced ageing mechanisms of solar absorber coatings (2017) Renew. Sustain. Energy Rev., 67, pp. 1282-1299;Navarro-Hermoso, J.L., Espinosa-Rueda, G., Heras, C., Salinas, I., Martinez, N., Gallas, M., Parabolic trough solar receivers characterization using specific test bench for transmittance, absorptance and heat loss simultaneous measurement (2016) Sol. Energy, 136, pp. 268-277;O'Keeffea, G.J., Mitchella, S.L., Myersb, T.G., Cregana, V., Modelling the efficiency of a nanofluid-based direct absorption parabolic trough solar collector (2018) Sol. Energy, 159, pp. 44-54;Kasaeian, A., Daneshazarian, R., Pourfayaz, F., Comparative study of different nanofluids applied in a trough collector with glass-glass absorber tube (2017) J. Mol. Liq., 234, pp. 315-323;Subramani, J., Nagarajan, P.K., Mahian, O., Sathyamurthy, R., Efficiency and heat transfer improvements in a parabolic trough solar collector using TiO2 nanofluids under turbulent flow regime (2018) Renew. Energy, 119, pp. 19-31;Mwesigye, A., Huan, Z., Meyer, J.P., Thermal performance and entropy generation analysis of a high concentration ratio parabolic trough solar collector with Cu-Therminol® VP-1 nanofluid (2016) Energy Convers. Manag., 120, pp. 449-465;Mwesigye, A., Bello-Ochende, T., Meyer, J.P., Heat transfer and thermodynamic performance of a parabolic trough receiver with centrally placed perforated plate inserts (2014) Appl. Energy, 136, pp. 989-1003;Reddy, K.S., Kumar, K.R., Ajay, C.S., Experimental investigation of porous disc enhanced receiver for solar parabolic trough collector (2015) Renew. Energy, 77, pp. 308-319;Fuqiang, W., Qingzhi, L., Huaizhi, H., Jianyu, T., Parabolic trough receiver with corrugated tube for improving heat transfer and thermal deformation characteristics (2016) Appl. Energy, 164, pp. 411-424;Huang, Z., Yu, G.L., Li, Z.Y., Tao, W.Q., Numerical study on heat transfer enhancement in a receiver tube of parabolic trough solar collector with dimples, protrusions and helical fins (2015) Energy Proced., 69, pp. 1306-1316;Osorio, J.D., Rivera-Alvarez, A., Girurugwiro, P., Yang, S., Hovsapian, R., Ordonez, J.C., Integration of transparent insulation materials into solar collector devices (2017) Sol. Energy, 147, pp. 8-21;Wang, Q., Pei, G., Honglun, Y., Munir, A., Mingke, H., Performance study of a parabolic trough solar collector with an inner radiation shield (2016) Bulg. Chem. Commun., 48 (E), pp. 77-87;Wirz, M., Petit, J., Haselbacher, A., Steinfeld, A., Potential improvements in the optical and thermal efficiencies of parabolic trough concentrators (2014) Sol. Energy, 107, pp. 398-414;Zhang, L., Yu, Z., Fan, L., Wang, W., Chen, H., Hu, Y., Fan, J., Cen, K., An experimental investigation of the heat losses of a U-type solar heat pipe receiver of a parabolic trough collector-based natural circulation steam generation system (2013) Renew. Energy, 57, pp. 262-268;Vasquez-Padilla, R., Demirkaya, G., Goswami, D.Y., Stefanakos, E., Rahman, M.M., Heat transfer analysis of parabolic trough solar receiver (2011) Appl. Energy, 88, pp. 5097-5110;Fan, M., Liang, H., You, S., Zhang, H., Zheng, W., Xia, J., Heat transfer analysis of a new volumetric based receiver for parabolic trough solar collector (2018) Energy, 142, pp. 920-931;Dudley, V.E., Kolb, G.J., Sloan, M., Kearney, D., Test Results: SGES LS-2 Solar Collector. Technical Report SAND-94-1884 (1994), Sandia National Laboratory;Duffie, J.A., Beckman, W.A., Solar Engineering of Thermal Processes (2013), fourth ed. Wiley;Incropera, F., DeWitt, D., Bergman, T.L., Lavine, A.S., Fundamentals of Heat and Mass Transfer (2007), sixth ed. John Wiley and Sons New York;Gnielinski, V., New equations for heat and mass transfer in the turbulent flow in pipes and channels (1975) Int. Chem. Eng., 16 (2), pp. 359-363;Ratzel, A., Hickox, C., Gartling, D., Techniques for reducing thermal conduction and natural convection heat losses in annular receiver geometries (1979) J. Heat Transf., 101 (1), pp. 108-113;Marshal, N., Gas Encyclopedia (1976), Elsevier New York;Bejan, A., Convection Heat Transfer (1995), second ed. John Wiley & Sons New York;Giovannetti, F., Föste, S., Ehrmann, N., Rockendorf, G., High transmittance, low emissivity glass covers for flat plate collectors: applications and performance (2014) Sol. Energy, 104, pp. 52-59;Kalogirou, S.A., Solar thermal collectors and applications (2004) Prog. Energy Combust., 30 (3), pp. 231-295;Burkholder, F., Kutscher, C., (2009) Heat Loss Testing of Schott's 2008 PTR70 Parabolic Trough Receiver, , National Renewable Energy Laboratory NREL/TP-550-45633;Lawrence Berkeley National Laboratory (LBNL) (2018), http://windowoptics.lbl.gov/data/igdb, Version 59;Ferrara, M., Castaldo, A., Esposito, S., D'Angelo, A., Guglielmo, A., Antonaia, A., AlN-Ag based low-emission sputtered coatings for high visible transmittance window (2016) Surf. Coating. Technol., 295, pp. 2-7ScopusDouble Glass Envelope (DGE)EfficiencyParabolic Trough Collector (PTC)Solar irradianceThermal emittanceThermal lossesVacuum conditionsPerformance analysis of Parabolic Trough Collectors with Double Glass EnvelopeArticleinfo:eu-repo/semantics/articlehttp://purl.org/coar/version/c_970fb48d4fbd8a85http://purl.org/coar/resource_type/c_6501http://purl.org/coar/resource_type/c_2df8fbb1Osorio, J.D., Universidad de Medellín; Ingeniería Térmica Ltda;Rivera-Alvarez, A., Ingeniería Térmica Ltda; Fundación ErgonOsorio, J.D.Rivera-Alvarez, A.http://purl.org/coar/access_right/c_16ec11407/4841oai:repository.udem.edu.co:11407/48412020-05-27 19:11:23.857Repositorio Institucional Universidad de Medellinrepositorio@udem.edu.co

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