Theoretical and experimental investigations of heat transfer in a trombe wall

Smolec, W.; Thomas, A.

doi:10.1016/0196-8904(93)90089-s

Cited by 52 publications

(12 citation statements)

References 15 publications

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“…The average convection heat transfer coefficient given by McAdams et al is used on the outside surface of the glass cover. In the absence of forced convection, a heat transfer coefficient of 5 W/(m 2 K) is designated [18]. The glass cover of the system is assumed to have an emissivity of 0.88 [19].…”

Section: Fluid Domainmentioning

confidence: 99%

Performance Analysis of a Combination System of Concentrating Photovoltaic/Thermal Collector and Thermoelectric Generators

Zhou

Meyers

et al. 2014

Journal of Electronic Packaging

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Thermoelectric (TE) modules utilize available temperature differences to generate electricity by the Seebeck effect. The current study investigates the merits of employing thermoelectrics to harvest additional electric energy instead of just cooling concentrating photovoltaic (CPV) modules by heat sinks (heat extractors). One of the attractive options to convert solar energy into electricity efficiently is to laminate TE modules between CPV modules and heat extractors to form a CPV-TE/thermal (CPV-TE/T) hybrid system. In order to perform an accurate estimation of the additional electrical energy harvested, a coupled-field model is developed to calculate the electrical performance of TE devices, which incorporates a rigorous interfacial energy balance including the Seebeck effect, the Peltier effect, and Joule heating, and results in better predictions of the conversion capability. Moreover, a 3D multiphysics computational model for the HCPV-TE/T water collector system consisting of a solar concentrator, 10 serially connected GaAs/Ge photovoltaic (PV) cells, 300 couples of bismuth telluride TE modules, and a cooling channel with heat-recovery capability, is implemented by using the commercial FE-tool Comsol Multiphysics V R . A conjugate heat transfer model is used, assuming laminar flow through the cooling channel. The performance and efficiencies of the hybrid system are analyzed. As compared with the traditional photovoltaic/thermal (PV/T) system, a comparable thermal efficiency and a higher 8% increase of the electrical efficiency can be observed through the PV-TE hybrid system. Additionally, with the identical convective surface area and cooling flow rate in both configurations, the PV-TE/T hybrid system yields higher PV cell temperatures but more uniform temperature distributions across the cell array, which thus eliminates the current matching problem; however, the higher cell temperatures lower the PV module's fatigue life, which has become one of the biggest challenges in the PV-TE hybrid system.

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Section: Fluid Domainmentioning

confidence: 99%

Performance Analysis of a Combination System of Concentrating Photovoltaic/Thermal Collector and Thermoelectric Generators

Zhou

Meyers

et al. 2014

Journal of Electronic Packaging

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“…(3) Glass Cover: A pv (h r,pv-g +h c )(T pv -T g )=A pv (h r,g-a +h w )(T g -T a ) ( 4 ) Electrical Power generation G=E+h w (T pv -T e ) +h c (T pv -T f ) ( 5 ) The maximum power output decreases linearly with increasing cell temperature and is proportional to the absorbed incident solar radiation as is given as: E= ( T pv +β) I r (6) The channel air temperature is assumed to vary linearly in the flow direction so that the mean temperature T f required to fix air properties is calculated as T f = (T out +T int )/2 (7) The average convective heat transfer coefficient due to wind on the outside surface of the PV glazing cover is given by [15] h w = 5.7+3.8V (8) The equations for laminar and turbulent boundary layer from Tsuji and Nagano [16] are used: N ux =0.387(G rx P r ) 1/4 for Laminar boundary layer (9) N ux =0.120(G rx P r ) 1/3 for Turbulent boundary layer (10) The heat transfer coefficient is calculated from h c (X)=(N ux λ a )/X (11) The overall heat loss coefficient U L combines the losses from the top (front) U t , bottom U b and sometimes edges U e but normally the edge losses is assumed to be negligible or included in the back loss: U L =U t +U b (12) The top heat loss coefficient U t is evaluated by considering the wind convection h w and the radiation heat exchange with sky h r,g-a from the glass cover of PV module [17]:…”

Section: Nomenclaturementioning

confidence: 99%

Implementation of Photo Voltaic Trombe Wall system for developing non-air conditioned buildings

Irshad

Habib

Thirumalaiswamy

2013

2013 IEEE Conference on Sustainable Utilization and Development in Engineering and Technology (CSUDET)

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Green building and sustainable architecture are new approach for addressing the energy and environmental crises. In this paper, a thorough review of Building integrated with Photovoltaic Trombe Wall systems is done on the basis of its performance based on electrical energy production as well as thermal load reduction. Also an in-depth review on the performance parameters such as, vent configuration, Insulation, thickness, color, PV cell temperature and glazing is presented in this study. Economic impact of PV Trombe wall system for residential building will be also studied in this paper. Based on the thorough review, it is clear that Building integrated PV system is one of the most promising technologies on renewable energy and there exists lot of scope to further improve their performances. Appropriate recommendations are made which will aid PV Trombe wall systems to enhance their efficiency and reduce their cost, making them more competitive in the present market.

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“…Likewise, later experimental research done by Smolec and Thomas [1993] and Onbasioglu and Egrican [2002] did not present enough information that could be used to make a direct comparison. Smolec and Thomas [1993] From all literature reviewed, only experimental data presented by Warrington and Ameel [1996] are applicable to directly compare with an existing feature for the Trombe wall in the EnergyPlus.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Of those component models, the inside convection coefficient model is probably the most important as most research on the Trombe wall focused on this particular subject [Akbari and Borgers 1979;Smolec and Thomas 1993;and Warrington and Ameel 1995]. Also, it has been shown that the calculation procedures for insolation, solar radiation transmitted through a clear window, and conduction through solid materials were adequately accurate and Judkoff 1988].…”

Section: Summary Of Significant Findingsmentioning

confidence: 99%

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Integration of Low Energy Technologies for Optimal Building and Space Conditioning Design

Fisher¹

2006

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EnergyPlus is the DOE's newest building energy simulation engine. It was developed specifically to support the design of low energy building systems. This project focused on developing new low energy building simulation models for EnergyPlus, verifying and validating new and existing EnergyPlus models and transferring the new technology to the private sector. The project focused primarily on geothermal and radiant technologies, which are related by the fact that both are based on hydronic system design.As a result of this project eight peer reviewed journal and conference papers were added to the archival literature and five technical reports were published as M.S. theses and are available in the archival literature. In addition, several reports, including a trombe wall validation report were written for web publication.Thirteen new or significantly enhanced modules were added to the EnergyPlus source code and forty-two new or significantly enhanced sections were added to the EnergyPlus documentation as a result of this work. A low energy design guide was also developed as a pedagogical tool and is available for web publication. Finally several tools including a hybrid ground source heat pump optimization program and a geothermal heat pump parameter estimation tool were developed for research and design and are available for web publication.3 EnergyPlus, the DOE's newest building energy simulation engine, was developed specifically to support the design of low energy building systems. This project focused on enhancements to the EnergyPlus environment related to achieving that goal. Three broad objectives were set forth in the project scope:1. Develop new low energy building simulation models for EnergyPlus. Low temperature radiant, geothermal system models and advanced zonal models were specifically in view.2. Verify and validate new and existing EnergyPlus models.3. Transfer the technology. Develop tools and technical reports to assist in EnergyPlus based design of low energy buildings.The project objectives were met or exceeded in every category as follows:• Eight peer reviewed journal and conference papers were added to the archival literature.• Five technical reports were published as M.S. theses and are available in the archival literature.• Thirteen new or significantly enhanced modules were added to the EnergyPlus source code.• Forty-two new or significantly enhanced sections were added to the EnergyPlus documentation.• A low energy design guide was developed as a pedagogical tool and is available for web publication.• A hybrid ground source heat pump optimization program was developed for research and design and is available for web publication.• A geothermal heat pump parameter estimation tool was developed for research and design and is available for web publication.• A trombe wall validation report was written and is suitable for web publication.A summary of the deliverables associated with each of the three main project objectives is shown below. This is followed by a table showing project t...

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Theoretical and experimental investigations of heat transfer in a trombe wall

Cited by 52 publications

References 15 publications

Performance Analysis of a Combination System of Concentrating Photovoltaic/Thermal Collector and Thermoelectric Generators

Performance Analysis of a Combination System of Concentrating Photovoltaic/Thermal Collector and Thermoelectric Generators

Implementation of Photo Voltaic Trombe Wall system for developing non-air conditioned buildings

Integration of Low Energy Technologies for Optimal Building and Space Conditioning Design

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