scholarly journals Passive Heating and Cooling of Photovoltaic Greenhouses Including Thermochromic Materials

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 438
Author(s):  
Javier Padilla ◽  
Carlos Toledo ◽  
Rodolfo López-Vicente ◽  
Raquel Montoya ◽  
José-Ramón Navarro ◽  
...  
Keyword(s):  
Crystalline Silicon ◽  
Construction Materials ◽  
Passive Heating ◽  
Light Spectrum ◽  
Photovoltaic Modules ◽  
Heating And Cooling ◽  
Energy Demands ◽  
Growing Conditions ◽  
Photovoltaic Technologies ◽  
Cover Material

The integration of photovoltaic technologies into greenhouse envelopes appears to be an innovative and environmentally-friendly way to supply their various energy demands. However, the effect on the inner growing conditions, especially on the temperature, must be assessed in order to effectively implement this solution. In this study, experimental temperature data were obtained over two years for four structures built with different photovoltaic technologies (mono-crystalline silicon, amorphous silicon, cadmium telluride, and an organic polymeric technology) and fitted to a thermal model in order to provide a comprehensive analysis of their potential utilization as a cover material in greenhouses. Additionally, the thermal effect of color in structures composed of several common construction materials (brick, wood, plasterboard and glass) was quantified and modelled, supplementing the thermal analysis of passive solutions for this application. In all cases, inner and ambient temperature differences of up to +20 °C, created by a passive heating effect during the day, and −5 °C, created by a passive cooling effect during the night, have been observed, suggesting the use of the photovoltaic modules with different degrees of structure coverage, complemented with the color tuning of the modules themselves as passive methods to control the temperature and light spectrum of greenhouses.

scholarly journals Optimum Thickness of Thermal Insulation with Both Economic and Ecological Costs of Heating and Cooling

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3835
Author(s):  
Robert Dylewski ◽  
Janusz Adamczyk
Keyword(s):  
Thermal Insulation ◽  
Construction Materials ◽  
Optimum Thickness ◽  
Degree Days ◽  
Transfer Coefficients ◽  
Cooling Period ◽  
Heating And Cooling ◽  
Optimum Heat ◽  
Materials Used ◽  
Building Walls

The energy efficiency of the construction sector should be determined by the cleanliness of the environment and, thus, the health of society. The scientific aim of this article was to develop a methodology for determining the optimum thickness of thermal insulation, taking into account both economic and ecological aspects and considering both heating and cooling costs. The method takes into account the number of degree days of the heating period, as well as the number of degree days of the cooling period. Variants in terms of different types of thermal insulation, various types of construction materials for building walls, climatic zones and heat sources, were taken into consideration. In order to find the optimum thicknesses of thermal insulation, both in economic and ecological terms, a metacriterion was used. The optimum thicknesses of thermal insulation with the use of the metacriterion were obtained in the range of 0.11–0.55 m. It was observed that the values of the optimum heat transfer coefficients for economic and ecological reasons do not depend on the type of construction materials used for vertical walls. The type of applied heat source is of the greatest importance for the size of the economic and ecological benefits. The proposed mathematical model for determining the optimum thickness of thermal insulation with the use of a metacriterion is a kind of generalization of earlier models from the literature.

scholarly journals A Study of Optimal Specifications for Light Shelves with Photovoltaic Modules to Improve Indoor Comfort and Save Building Energy

2021 ◽  
Vol 18 (5) ◽  
pp. 2574
Author(s):  
Heangwoo Lee ◽  
Xiaolong Zhao ◽  
Janghoo Seo
Keyword(s):  
Energy Savings ◽  
Building Energy ◽  
Energy Performance ◽  
Building Energy Efficiency ◽  
Efficiency Change ◽  
Photovoltaic Modules ◽  
Heating And Cooling ◽  
Pv Module ◽  
Pv Modules ◽  
Indoor Comfort

Recent studies on light shelves found that building energy efficiency could be maximized by applying photovoltaic (PV) modules to light shelf reflectors. Although PV modules generate a substantial amount of heat and change the consumption of indoor heating and cooling energy, performance evaluations carried out thus far have not considered these factors. This study validated the effectiveness of PV module light shelves and determined optimal specifications while considering heating and cooling energy savings. A full-scale testbed was built to evaluate performance according to light shelf variables. The uniformity ratio was found to improve according to the light shelf angle value and decreased as the PV module installation area increased. It was determined that PV modules should be considered in the design of light shelves as their daylighting and concentration efficiency change according to their angles. PV modules installed on light shelves were also found to change the indoor cooling and heating environment; the degree of such change increased as the area of the PV module increased. Lastly, light shelf specifications for reducing building energy, including heating and cooling energy, were not found to apply to PV modules since PV modules on light shelf reflectors increase building energy consumption.

Predicted changes in energy demands for heating and cooling due to climate change

2010 ◽  
Vol 35 (1-2) ◽  
pp. 100-106 ◽  
Author(s):  
Mojca Dolinar ◽  
Boris Vidrih ◽  
Lučka Kajfež-Bogataj ◽  
Sašo Medved
Keyword(s):  
Climate Change ◽  
Heating And Cooling ◽  
Energy Demands

Fault diagnosis of PID in crystalline silicon photovoltaic modules through I-V curve

2021 ◽  
pp. 114236
Author(s):  
Mingyao Ma ◽  
Haisong Wang ◽  
Nianwen Xiang ◽  
Ping Yun ◽  
Hanyu Wang
Keyword(s):  
Fault Diagnosis ◽  
Crystalline Silicon ◽  
Photovoltaic Modules

Recycling Crystalline Silicon Photovoltaic Modules

2018 ◽  
pp. 61-102
Author(s):  
Pablo Dias ◽  
Pablo Dias ◽  
Hugo Veit
Keyword(s):  
Crystalline Silicon ◽  
Photovoltaic Modules

scholarly journals Wide-Bandgap Halide Perovskites for Indoor Photovoltaics

2021 ◽  
Vol 9 ◽  
Author(s):  
Lethy Krishnan Jagadamma ◽  
Shaoyang Wang
Keyword(s):  
Wide Bandgap ◽  
Light Spectrum ◽  
Functional Layer ◽  
Research Attention ◽  
Device Architecture ◽  
Copper Indium ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
Art Research ◽  
Photovoltaic Technologies

Indoor photovoltaics (IPVs) are receiving great research attention recently due to their projected application in the huge technology field of Internet of Things (IoT). Among the various existing photovoltaic technologies such as silicon, Cadmium Telluride (CdTe), Copper Indium Gallium Selenide (CIGS), organic photovoltaics, and halide perovskites, the latter are identified as the most promising for indoor light harvesting. This suitability is mainly due to its composition tuning adaptability to engineer the bandgap to match the indoor light spectrum and exceptional optoelectronic properties. Here, in this review, we are summarizing the state-of-the-art research efforts on halide perovskite-based indoor photovoltaics, the effect of composition tuning, and the selection of various functional layer and device architecture onto their power conversion efficiency. We also highlight some of the challenges to be addressed before these halide perovskite IPVs are commercialized.

Study of Snail Trail Effects on Performance of Crystalline Silicon Photovoltaic Modules

2021 ◽  
Author(s):  
Neolmar de M. Filho ◽  
Antonia S. A. Cardoso Diniz ◽  
Lawrence L. Kazmerski
Keyword(s):  
Crystalline Silicon ◽  
Photovoltaic Modules
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