Multilayers for efficient thermal energy conversion in high vacuum flat solar thermal panels

Maio, Davide De; Caldarelli, Antonio; Luca, Daniela De; Gennaro, Emiliano Di; Casalino, Maurizio; Iodice, Mario; Gioffrè, M.; Russo, R.; Musto, Marilena

doi:10.1016/j.tsf.2021.138869

Cited by 15 publications

(7 citation statements)

References 30 publications

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“…The literature suggests the use of conventional thermal insulating materials above a temperature of 100 °C; among these, rockwool is one of the most used materials with a thermal conductivity of 0.040 (W/m‧K). All the other curves are referred to the λeq trend of the designed prototype for different internal emissivity ε1 values: 0.15 for stainless steel [20], 0.045 for aluminium coating [21], and 0.02 for copper coating [22]. The simulations show no advantage at high vacuum thermal insulation between two stainless steel surfaces, as the emissivity of stainless steel is too high.…”

Section: Design Of the Vacuum Insulatormentioning

confidence: 99%

Design and thermal test of high-vacuum insulator for heat delivery pipes

Capolupo,

D’Alessandro,

Strazzullo

et al. 2024

J. Phys.: Conf. Ser.

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Thermal piping insulation of implants is crucial for heat delivery, production, collection, or storage at high temperature values. It is currently obtained by enveloping low thermal conductivity materials such as rockwool, fiberglass, polyurethane, polystyrene, and aerogel. However, better performances can be reached by adopting vacuum technology. In this case, conductive losses are annihilated, and the radiative heat transfer mechanism represents the only loss mechanism. Here, we compare a high vacuum-based novel solution and the traditional insulation for heat delivery applications. We propose a high vacuum- based solution consisting of an evacuated gap that surrounds the hot pipe coated by a thin aluminium foil. Experimental results using this novel solution show a fivefold reduction of the thermal radiation losses compared to the traditional solutions when in the temperature range between 100 °C and 250 °C.

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Section: Design Of the Vacuum Insulatormentioning

confidence: 99%

Design and thermal test of high-vacuum insulator for heat delivery pipes

Capolupo,

D’Alessandro,

Strazzullo

et al. 2024

J. Phys.: Conf. Ser.

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“…The HVFP collector produced by TVP Solar has dimensions of 1 m x 2 m wide. Since it has a thickness of about 0.05 m (thus much thinner than the lateral dimensions), we can use the infinite-layer approximation, already validated in previous works [32,33]. Hence, the evacuated PV-T device is modeled by using a 1D thermal model developed in MATLAB and based on the steady-state balance of energy on its main components (glass cover and PV-SSA layer).…”

Section: Physical Model Of Evacuated Pv-t Systemmentioning

confidence: 99%

“…Concerning the calculation of the thermal efficiency, realistic values of absorptance in the solar region and emittance have been selected for the SSA, i.e. α S S A =0.95 in the solar spectral region and ε S S A =0.05 elsewhere, according to previous literature [33].…”

Section: Physical Model Of Evacuated Pv-t Systemmentioning

confidence: 99%

High Vacuum Flat Plate Photovoltaic-Thermal (PV-T) Collectors: Efficiency Analysis

Luca¹,

Strazzullo²,

Gennaro³

et al. 2022

Preprint

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We investigate the performance of a novel flat photovoltaic-thermal (PV-T) module under high-vacuum through a 1D numerical model based on steady-state energy balance, with the aims of optimizing the simultaneous production of thermal and electrical energy. In the proposed design, the photovoltaic (PV) cell is positioned directly above the selective solar absorber (SSA), in a multilayer or fully integrated PV-SSA structure, which allows full exploitation of spectral solar radiation. In fact, in this configuration the losses related to non-absorption of low-energy photons and thermalization, typical of a classical single-junction PV cell, are reduced. The present study is conducted as the emittance and energy bandgap of the PV layer varied, thus admitting a wide variety of materials into the analysis. The dependence of the temperature coefficient, β(%/K), on the energy bandgap of the PV cell is also included. In the last part of the work, we discuss the performance of the proposed evacuated PV-T equipped with a SSA layer and thin film solar cells, namely those made of CdTe, CdS and GaAs. Overall, the paper highlights the great advantage of using high vacuum insulation, which suppresses conductive losses, and the versatility of the proposed system, which could be adapted to the user's needs simply by choosing the appropriate material for the photovoltaic layer.

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“…It is because the evacuated tube solar collectors (ETSCs) exploit vacuum to reduce convective losses, possess selective absorbers to minimize the radiative losses, and the circular absorber causes the sunshine to always radiate perpendicular to the collector surface [7]. There have also been some research working on evacuated flat plate solar collectors; however, they are under development and have not still been commercialized widely [8]. Therefore, this paper continues with the ETSCs research background and how TES units have been integrated with them to decrease the heat losses and increase their overall efficiency.…”

Section: Introductionmentioning

confidence: 99%