Using phase change materials in photovoltaic systems for thermal regulation and electrical efficiency improvement: A review and outlook

Ma, Tao; Yang, Hongxing; Zhang, Yinping; Lu, Lin; Wang, Xin

doi:10.1016/j.rser.2014.12.003

Cited by 322 publications

(85 citation statements)

References 76 publications

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“…Thus, an additional research effort is still required in order to obtain detailed dynamic simulation models for the energy analysis of the whole building-plant system [57]. In this regard, very few studies available in literature deal with: (i) building integrated PV systems coupled to PCM panels; (ii) passive and active effects on the overall building energy performance of BIST and BIPV systems, also coupled to PCMs wallboards [58].…”

Section: Innovative Capabilities Of Detectmentioning

confidence: 99%

Code-to-Code Validation and Application of a Dynamic Simulation Tool for the Building Energy Performance Analysis

Buonomano

2016

Energies

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Abstract:In this paper details about the results of a code-to-code validation procedure of an in-house developed building simulation model, called DETECt, are reported. The tool was developed for research purposes in order to carry out dynamic building energy performance and parametric analyses by taking into account new building envelope integrated technologies, novel construction materials and innovative energy saving strategies. The reliability and accuracy of DETECt was appropriately tested by means of the standard BESTEST validation procedure. In the paper, details of this validation process are accurately described. A good agreement between the obtained results and all the reference data of the BESTEST qualification cases is achieved. In particular, the obtained results vs. standard BESTEST output are always within the provided ranges of confidence. In addition, several test cases output obtained by DETECt (e.g., dynamic profiles of indoor air and building surfaces temperature and heat fluxes and spatial trends of temperature across walls) are provided.

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Section: Innovative Capabilities Of Detectmentioning

confidence: 99%

Code-to-Code Validation and Application of a Dynamic Simulation Tool for the Building Energy Performance Analysis

Buonomano

2016

Energies

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“…Heat transfer surface area is limited in miniature designs, therefore, they cannot be cooled down with natural or forced convection when working fluid is air. Therefore, the current literature focuses on heat transfer enhancement with phase changing materials or forced convection with water, oil or nano-fluids working fluids [3][4][5][6][7][8][9][10][11][12][13][14]. These methods are essential in order to increase the rate of heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of constructal vascular channels for self-cooling: Parallel channels, tree-shaped and hybrid designs

Yenigun

Çetkin

2016

International Journal of Heat and Mass Transfer

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a b s t r a c tIn this paper, we show experimentally and numerically how a plate which is subjected to a constant heat load can be kept under an allowable temperature limit. Vascular channels in which coolant fluid flows have been embedded in the plate. Three types of vascular channel designs were compared: parallel channels, tree-shaped and their hybrid. The effects of channel design on the thermal performance for different volume fractions (the fluid volume over the solid volume) are documented. In addition, the effects of the number of channels on cooling performance have been documented. Changing the design from parallel channels to tree-shaped designs decreases the order of pressure drop. Hence increase in the order of the convective heat transfer coefficient is achieved. However, tree-shaped designs do not bathe the entire domain, which increases the conductive resistances. Therefore, additional channels were inserted at the uncooled regions in the tree-shaped design (hybrid design). The best features of both parallel channels and tree-shaped designs are combined in the hybrid of them: the flow resistances to the fluid and heat flow become almost as low as the tree-shaped and parallel channels designs, respectively. The effect of design on the maximum temperature shows that there should be an optimum design for a distinct set of boundary conditions, and this design should be varied as the boundary conditions change. This result is in accord with the constructal law, i.e. the shape should be varied in order to minimize resistances to the flows.

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“…Apart from the refrigerants, Phase-Changing-Materials (PCM), in conjunction with solar PV as well as thermal energy, have also been employed in several instances of designing active building architecture through devices known as PV-ST-PCM systems; wherein the heat generated in the solar panels is captured by the PCM which then transfers this heat to a suitable transfer medium such as air or water which can then be utilized for thermal applications in the building such as water heating, space heating, drying processes etc [19]. While PCMs have been used mainly with Building Integrated Photo Voltaics (BIPV) in BIPV-PCM systems at large [20], owing to the poor heat transfer Indirect or closed loop systems use a heat exchanger that separates the potable water from the intermediate fluid, also termed as the "heattransfer fluid" (HTF), that circulates through the collector.…”

Section: Low Temperature Collectormentioning

confidence: 99%

Recent Developments in Heat Transfer Fluids Used for Solar Thermal Energy Applications

Srivastva¹,

Malhotra²,

Sc³

2015

J Fundam Renewable Energy Appl

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Solar thermal collectors are emerging as a prime mode of harnessing the solar radiations for generation of alternate energy. Heat transfer fluids (HTFs) are employed for transferring and utilizing the solar heat collected via solar thermal energy collectors. Solar thermal collectors are commonly categorized into low temperature collectors, medium temperature collectors and high temperature collectors. Low temperature solar collectors use phase changing refrigerants and water as heat transfer fluids. Degrading water quality in certain geographic locations and high freezing point is hampering its suitability and hence use of water-glycol mixtures as well as water-based nano fluids are gaining momentum in low temperature solar collector applications. Hydrocarbons like propane, pentane and butane are also used as refrigerants in many cases. HTFs used in medium temperature solar collectors include water, waterglycol mixtures -the emerging "green glycol" i.e., trimethylene glycol and also a whole range of naturally occurring hydrocarbon oils in various compositions such as aromatic oils, naphthenic oils and paraffinic oils in their increasing order of operating temperatures. In some cases, semi-synthetic heat transfer oils have also been reported to be used. HTFs for high temperature solar collectors are a high priority area and extensive investigations and developments are occurring globally. In this category, wide range of molecules starting from water in direct steam generation, air, synthetic hydrocarbon oils, nanofluid compositions, molten salts, molten metals, dense suspension of solid silicon carbide particles etc., are being explored and employed. Among these, synthetic hydrocarbon oils are used as a fluid of choice in majority of high temperature solar collector applications while other HTFs are being used with varying degree of experimental maturity and commercial viability -for maximizing their benefits and minimizing their disadvantages. Present paper reviews the recent developments taking place in the area of heat transfer fluids for harnessing solar thermal energy. Refrigerants/phase changing materials: These are low boiling point but high heat capacity substances used in the solar collectors to transfer heat in applications like solar space cooling and heating, refrigerators, air conditioning, etc [7]. These materials absorb heat from the solar collectors, produce work either by expanding in a turbo-generator of a vapor compression cycle or by dissociating the refrigerant from its absorbent in a vapor absorption cycle [8]. In some of the relatively high temperature applications, higher boiling point refrigerants are used as indirect heat transfer fluids, wherein the heat collected from the solar collectors is transferred to another fluid like water from where the refrigerants pick-up heat to do the required work in the turbo-generators [9,10]. Recent Developments in Heat Transfer

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Using phase change materials in photovoltaic systems for thermal regulation and electrical efficiency improvement: A review and outlook

Cited by 322 publications

References 76 publications

Code-to-Code Validation and Application of a Dynamic Simulation Tool for the Building Energy Performance Analysis

Code-to-Code Validation and Application of a Dynamic Simulation Tool for the Building Energy Performance Analysis

Experimental and numerical investigation of constructal vascular channels for self-cooling: Parallel channels, tree-shaped and hybrid designs

Recent Developments in Heat Transfer Fluids Used for Solar Thermal Energy Applications

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