Energy Efficiency of a Solar Wall with Transparent Insulation in Polish Climatic Conditions

Świrska-Perkowska, Jadwiga; Kucharczyk, Andrzej; Wyrwał, Jerzy

doi:10.3390/en13040859

Cited by 8 publications

(10 citation statements)

References 33 publications

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“…Using the analogy of [39], it follows that the ray trajectory can be computed by solving six coupled first-order differential equations for the components of v and r according to Equation (20).…”

Section: Short-wave Radiation Transport Modelingmentioning

confidence: 99%

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Experimental and Numerical Study on the Heat Transfer Characteristics of a Newly-Developed Solar Active Thermal Insulation System

et al. 2021

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A newly-developed solar active thermal insulation system (SATIS) is introduced with the main objective to accomplish a highly-dependent total solar transmittance on the irradiation angle. SATIS is also designed to obtain the maximum transmittance at a prescribed design irradiation angle and to reduce it remarkably at higher irradiation angles. A purely mineral thermal insulation plaster with micro hollow glass spheres is applied to manufacture the investigated SATIS prototype. Light-conducting elements (LCEs) have been introduced into SATIS and suitable closing elements have been applied. The SATIS prototype has been investigated both experimentally and numerically. It turned out that the contributions of conduction, radiation and convection to the effective thermal conductivity of SATIS, without the closing elements (49 mWmK), amount to 86.2%, 13.2% and 0.6%, respectively. The angle-dependent short-wave radiation exchange within the LCE has been investigated via ray tracing. At the incidence angle of 19% (design angle), 27% of the radiation within the LCE is absorbed by the absorber plate, resulting in measured and computed total solar energy transmittances of 11.2%/11.7%, respectively. For a typical summer irradiation angle of 60%, 98% of the incident radiation is absorbed by the surfaces at the entrance of the LCE. The corresponding total solar energy transmittance amounts to 2.9%.

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Section: Short-wave Radiation Transport Modelingmentioning

confidence: 99%

“…Swirska-Perkowska et al [20] performed numerical simulations for an entire wall structure including a TIM. The introduced numerical model, which is developed for a honeycomb-type TIM made of modified cellulose acetate on a multi-layer wall, was used to predict monthly energy savings for different climatic conditions in Poland.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on the Heat Transfer Characteristics of a Newly-Developed Solar Active Thermal Insulation System

et al. 2021

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“…Without chemical admixtures, they generally have low thermal conductivity [6]. They are very popular in the construction industry [7,8], and because they can also be transparent, they are used to achieve high thermal yields, in buildings with walls with so-called high optical efficiency [9]. Mention should also be made of the so-called solar energy market, where plastics are increasingly competing with glass or metal structural elements in various solar devices due to their relatively low weight and high durability.…”

Section: Introductionmentioning

confidence: 99%

Emissivity measurement of black paint using the calorimetric method

2023

Archives of Thermodynamics

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The paper is of practical importance and describes the construction of a test rig and the measurement method for determining the relative emissivity coefficient of thermosensitive thin polymer coatings. Polymers are high-molecular chemical compounds that produce chains of repeating elements called 'mers'. The polymers can be natural and artificial. The former ones form the building material for living organisms, the latter -for plastics. In this work, the words plastics and polymers are used as synonyms. Some plastics are thermosensitive materials with specific physical and chemical properties. The calorimetric method mentioned in the title consists of two steps. The first stage, described here, involves very accurately measuring the emissivity of black paint with the highest possible relative emissivity coefficient, which covers the surface of the heater and the inner surface of the chamber. In the second step, the thermosensitive polymer will be placed on the inner surface of the chamber, while black paint with a known emissivity coefficient will remain on the heater. Such a way of determining the properties of thermosensitive polymers will increase the error of the method itself, but at the same time will avoid melting of the polymer coating. During the tests, the results of which are presented in this work, the emissivity coefficient of the black paint was obtained in the range of 0.958-0.965.

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“…By using a 300 mm thick brick wall behind the TI system, summer overheating problems were reduced and delayed by up to 12 h in the office zones. An entire wall structure consisting of an internally plastered sand-lime brick and a TI system was numerically investigated in [16] from September to May for different facade orientations. It was concluded that the application of transparent insulation to a wall with an eastern or western orientation leads to a reduction of the annual effective heat gains of the building envelope in the range of 24% to 31% with respect to the value of these effective heat gains for a south-oriented wall structure.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Annual Transmission Heat Loss Reduction of a Refurbished Existing Building with an Advanced Solar Selective Thermal Insulation System

2021

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A numerical parameter sensitivity analysis of the design parameters of the recently published solar selective thermal insulation system (SATIS) has been carried out to enhance its thermal and optical properties. It turned out that the insulation properties of SATIS can be effectively improved by reducing the length of the glass closure element. Increasing the area share of the light conducting elements (LCEs) and decreasing their length-to-diameter (L/D) ratio were identified as key parameters in order to increase the solar gain. Two SATIS variants were compared with the same wall insulation without SATIS in a yearly energetic performance assessment. The SATIS variant with 10 mm length of the closure element, 44.2% area share of LCE, as well as front and rear diameters of 12 mm/9 mm shows an 11.8% lower transmission heat loss over the heating period than the wall insulation without SATIS. A new methodology was developed to enable the implementation of the computed solar gains of SATIS in 1D simulation tools. The result is a radiant heat flow map for integration as a heat source in 1D simulation models. A comparison between the 1D and 3D models of the inside wall heat fluxes showed an integral yearly agreement of 98%.

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Energy Efficiency of a Solar Wall with Transparent Insulation in Polish Climatic Conditions

Cited by 8 publications

References 33 publications

Experimental and Numerical Study on the Heat Transfer Characteristics of a Newly-Developed Solar Active Thermal Insulation System

Experimental and Numerical Study on the Heat Transfer Characteristics of a Newly-Developed Solar Active Thermal Insulation System

Emissivity measurement of black paint using the calorimetric method

Assessment of the Annual Transmission Heat Loss Reduction of a Refurbished Existing Building with an Advanced Solar Selective Thermal Insulation System

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