Preliminary investigation on photo-thermal performance of a novel embedded building integrated solar evacuated tube collector with compound parabolic concentrator

Deng, Chenggang; Chen, Fei

doi:10.1016/j.energy.2020.117706

Cited by 24 publications

(6 citation statements)

References 29 publications

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“…The study [13] examines the modeling of solar irradiation to increase the supply of solar energy to a vacuum tube collector with a parabolic concentrator using its geometric characteristics. Optical modeling is carried out by the authors by varying the angles of the solar elevation projection, and its optical efficiency is estimated by the method of mathematical modeling.…”

Section: Engineeringmentioning

confidence: 99%

Definition of the daily model of distribution of solar radiation on the curved surfaces of buildings

et al. 2022

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The development of the integration of renewable energy into the energy supply of buildings leads to the formulation of the problem of efficient placement of solar thermal devices on surfaces of complex shapes (shells). An urgent task is the development of tools that can justify the decision-making by designers about the advisability of placing solar thermal devices and their implementation in the energy-efficient design of buildings. The study solves the problem of finding zones on the surface of the envelope, receiving the maximum amount of solar radiation during a given period of time – an epoch. A method is applied based on discrete geometric modeling of solar radiation input to curved surfaces of buildings. In this case, the interaction of a set of design parameters is taken into account: parameters of the shape of a curved surface and parameters of variable sunlight for the characteristic dates of September 21, March 21 – the solar equinox and December 21, June 21 – the winter and summer solstices. In the course of the study, N is determined – the optimal number of fixed positions of the Sun on the solar trajectory for different angles of solar declination (for June 22 N=17, for September 21, March 21 N=11, for December 21 N=8), for a given geographical location. One of the examples of modeling the amount of solar radiation entering the surface of a hyperbolic paraboloid during the day at the geographical latitude δ=52° (Kyiv, Ukraine) is shown. The simulation results in a family of lines of the same level of solar radiation on a curved surface during the day. Using the values of the averaged daily model, it is possible to proceed to obtaining averaged daily models for the estimated time interval at the stage of pre-project proposals to predict the efficiency of using the solar system

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Section: Engineeringmentioning

confidence: 99%

Definition of the daily model of distribution of solar radiation on the curved surfaces of buildings

et al. 2022

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“…To quote only a few examples, there are papers reporting the performance and efficiency of CPC troughs with various absorber shapes, [8][9][10][11] applications to hot water heating, [12][13][14][15][16][17] to refrigeration, [18][19][20] to chemical processes 21 and for water de-salination. 22 In a recent paper 23 it is suggested to mount an assembly of standard double-wall CPC on the side of buildings for water heating applications. In addition there is a large body of work on the coupling of CPC concentrators to photovoltaic devices, see References 24,25and references therein.…”

Section: Compound Parabolic Concentrator (Cpc) Troughsmentioning

confidence: 99%

A non‐tracking semi‐circular trough solar concentrator

2020

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Summary We report on the development of non‐tracking solar concentrator troughs designed subject to the condition that they operate efficiently for diffuse irradiation from all angles during daylight hours. Troughs of the usual compound parabolic form were considered initially. Remarkably however, the most efficient shape for the above requirement turns out to be a trough of simple semi‐circular cross‐section incorporating a tube of height equal to the circle radius and with a planar absorber plate placed vertically. This trough has a limited concentration ratio of exactly 2.0 but an intercept factor for incident radiation of 100% for all angles of incidence. This desirable feature is explained from the properties of caustics arising from reflection of incident light at the semi‐circular trough (SCT) surface. This very simplest of trough design has the clear advantages of small size and low‐cost of manufacture. Experimental tests conducted under varying solar irradiation conditions, demonstrate that the simple step of placing an evacuated tube in a SCT can lead to a power output gain of a factor of at least 1.7 on average.

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“…The addition of CPC in solar collectors shows promising improvement in efficiency. Deng and Chen (2020) developed ETSC with CPC integrated with building structure and studied its performance. The CPC structure integration increases the solar collector's optical and thermal efficiency to 72.2% and 55.4%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of evacuated tubes with thermosyphon heat pipe solar collector integrated with compound parabolic concentrator under different operating conditions

Govindasamy,

Palanivel,

Meena

et al. 2023

Energy Exploration & Exploitation

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The present work experimentally evaluated the performance of a solar collector comprised evacuated tube heat pipe (ETHP) coupled with a compound parabolic concentrator at different tilt angles. Therefore, experiments have been conducted in the climate conditions of Tamil Nadu (77.07° E,11.04° N), India, from April 15, 2019, to May 20, 2019. The objective of the work is to explore the effect of a tilting angle on the performance of an evacuated tube solar collector with a thermosyphon attached to the compound parabolic concentrator. The CPC is designed with an aperture width of 343 mm, concentration ratio of 2.32, and aperture angle of 25.4°, improving the solar collector efficiency with the help of MATLAB Programming, which gets Coordinate points based on these coordinate points. CPC Profile is fabricated. The Thermosyphon heat pipe is constructed with a Copper tube having a 19 mm diameter with 40% Acetone charged. The experiments were conducted by varying the tilting angles of the solar collector at 15°, 30°, 45°, and 60° horizontal. The heat resistance and instantaneous efficiency of the solar collector are studied in this study. The result reveals a minimum thermal resistance of 0.02 kW−1, and a maximum efficiency of 78% was recorded at a 45° tilting angle.

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Preliminary investigation on photo-thermal performance of a novel embedded building integrated solar evacuated tube collector with compound parabolic concentrator

Cited by 24 publications

References 29 publications

Definition of the daily model of distribution of solar radiation on the curved surfaces of buildings

Definition of the daily model of distribution of solar radiation on the curved surfaces of buildings

A non‐tracking semi‐circular trough solar concentrator

Performance analysis of evacuated tubes with thermosyphon heat pipe solar collector integrated with compound parabolic concentrator under different operating conditions

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