scholarly journals Evaluation of Global Solar Radiation Received by a Spherical Solar Collector

2012 ◽  
Vol 69 (2) ◽  
Author(s):  
Ferenc GáSPáR ◽  
Mugur BÄ‚LAN ◽  
Lorentz Já„NTSCHI ◽  
Victor ROȘ
Keyword(s):  
Solar Radiation ◽  
Flat Plate ◽  
Surface Area ◽  
Tilt Angle ◽  
Solar Collector ◽  
Global Solar Radiation ◽  
Radiation Incident ◽  
Solar Radiation Incident ◽  
Flat Plate Solar Collector ◽  
Existing Data

In the paper the global solar radiation incident on a fixed spherical solar collector is evaluated and compared to a south oriented with 46 grade tilt angle fixed flat plate solar collector. Mean daily and hourly solar radiation are calculated from existing data for Cluj-Napoca, Romania. The results show that depending on the equivalent absorbing surface area taken into account, spherical collectors can be more efficient in receiving solar radiation than flat plate collectors.

The Effect of Local Meteorological Conditions on the Optimal Tilt Angle of a Solar Energy Collector—A Case Study in Poland

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Ryszard Myhan ◽  
Jacek Bieranowski ◽  
Zbigniew Szwejkowski ◽  
Eliza Sitnik
Keyword(s):  
Solar Radiation ◽  
Flat Plate ◽  
Tilt Angle ◽  
Solar Collector ◽  
Meteorological Data ◽  
Active Surface ◽  
Meteorological Conditions ◽  
Energy Output ◽  
Flat Plate Solar Collector

This study compares the potential annual energy absorption of a flat-plate solar collector at different tilt angles in Poland. Optimal tilt angles were tested in three variants: over the course of the year, in fall/winter and in spring/summer. The results were compared with automatically tracked collectors where the active surface is perpendicular to the angle at which solar radiation reaches the collector. The results were simulated based on the meteorological data. A comparison of the energy outputs of solar collectors in optimization variants 1, 2, and 3 indicates that variant 1 produces the highest energy output.

Numerical Investigation of the Effects of Environmental Parameters and Geometry on Energy Absorption for an Open-type Water-cooled Flat-plate Solar Collector

2000 ◽  
Vol 122 (2) ◽  
pp. 56-62 ◽  
Author(s):  
B. Song ◽  
H. Inaba ◽  
A. Horibe
Keyword(s):  
Heat Flux ◽  
Flat Plate ◽  
Energy Absorption ◽  
Tilt Angle ◽  
Solar Collector ◽  
Water Film ◽  
Operating Conditions ◽  
Open Type ◽  
Type Water ◽  
Flat Plate Solar Collector

A two-dimensional mathematical model was developed for predicting the performance of an open-type water-cooled flat-plate solar collector, and solved numerically through an implicit finite difference method. The effects of various environmental and geometric conditions on energy absorption for the collector were investigated. The results predict that there is an optimum length and tilt angle for the absorbing plate for which the collector could obtain the highest solar energy absorptance. The latent heat flux of water evaporation can be 3 to 15 times larger than the sensible heat flux under normal operating conditions. The wind speed and the inlet water temperature have a large influence on the energy absorption of the collector. The effects of the solar incident flux, the atmospheric humidity and temperature, the absorbing plate tilt angle and length, and the water film thickness on the temperature rise of the water film and/or the absorptance of the collector are clarified. The open-type flat-plate collector is suitable to operate at lower inlet water temperatures and in regions where the local latitude is in the range of 20°N-40°N, and the weather is humid and hot with low winds. [S0199-6231(00)00202-1]

scholarly journals Energy and exergy analysis of air based photovoltaic thermal (PVT) collector: a review

2019 ◽  
Vol 9 (1) ◽  
pp. 109 ◽  
Author(s):  
Ahmad Fudholi ◽  
Mariyam Fazleena Musthafa ◽  
Abrar Ridwan ◽  
Rado Yendra ◽  
Ari Pani Desvina ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Flat Plate ◽  
Solar Collector ◽  
Exergy Analysis ◽  
Exergy Efficiency ◽  
Pv Panel ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Flat Plate Solar Collector

<span lang="EN-US">Photovoltaic thermal (PVT) collectors convert solar radiation directly to both electrical and thermal energies. A PVT collector basiccaly combines the functions of a flat plate solar collector and those of a PV panel. This review presents thermodinamics fundamentals, descriptions, and previous works conducted on energy and exergy analysis of air based PVT collector. Studies in 2010 to 2018 of the energy and exergy analysis of air based PVT collectors are summarized. The energy and exergy efficiency of air based PVT collector ranges from 31% to 94% and 8.7% to 18%, respectively. In addition, flat plate solar collector is presented. Studies conducted on air based PVT collectors are reviewed.</span>

Optimum tilt angle for a flat plate solar collector

1988 ◽  
Vol 28 (2) ◽  
pp. 185-191 ◽  
Author(s):  
G.R. Saraf ◽  
Faik Abdul Wahab Hamad
Keyword(s):  
Flat Plate ◽  
Tilt Angle ◽  
Solar Collector ◽  
Flat Plate Solar Collector

Flat-Plate Solar Collector in Transient Operation: Modeling and Measurements

2013 ◽  
Author(s):  
Ahmad M. Saleh ◽  
Donald W. Mueller ◽  
Hosni I. Abu-Mulaweh
Keyword(s):  
Solar Radiation ◽  
Differential Equations ◽  
Flat Plate ◽  
Solar Collector ◽  
Storage Tank ◽  
Ambient Air ◽  
Time Varying ◽  
Ambient Conditions ◽  
Flow Rates ◽  
Flat Plate Solar Collector

Solar energy is a viable alternative to limited fossil fuel resources. One of the simplest and most direct applications of this energy is the conversion of solar radiation into thermal energy with a flat-plate solar collector which can be used in water-heating systems. This paper presents a mathematical model for simulating the transient processes which occur in liquid flat-plate solar collectors. A discrete nodal model that represents the flat-plate solar collector’s layers and the storage tank is employed. The model is based on solving a system of coupled differential equations which describe the energy conservation for the glass cover, air gap, absorber, fluid, insulation, and the storage tank. Inputs to the model include the time-varying liquid flow rate, incident solar radiation, and ambient air temperature, as well as the volume of liquid in the storage tank and initial temperature of the solar collector and tank. The system of differential equations is solved iteratively using an implicit, finite-difference formulation executed with MATLAB software. In order to verify the proposed method, an experiment was designed and conducted on different days with variable ambient conditions and flow rates. The comparison between the time-varying computed and measured fluid temperature at the collector outlet shows good agreement. The proposed method is extremely general and flexible accounting for variable ambient conditions and flow rates, as well as allowing for a geometrical and thermophysical description of all essential components of the solar collector system, including the storage tank. The validated and verified, general model is suitable to investigate the effectiveness of various components without the necessity of carrying out experimental work, and the flexible computational scheme is useful for transient simulations of energy systems.

A Study on Aspect Ratio Optimization of Flat-Plate Solar Collector Arrays in Winter Months

2013 ◽  
Vol 368-370 ◽  
pp. 1201-1204
Author(s):  
Sheng Xian Wei ◽  
Feng Yan ◽  
Cui Qiong Yan ◽  
De Rong Zhao
Keyword(s):  
Solar Radiation ◽  
Aspect Ratio ◽  
Flat Plate ◽  
Solar Collector ◽  
Large Scale ◽  
Calculation Model ◽  
Floor Area ◽  
Aspect Ratios ◽  
Flat Plate Solar Collector ◽  
Ratio Optimization

A calculation model to optimize aspect ratios of a large scale solar collector array installed on the limited horizontal roofs has been developed. The relations between the average daily solar radiation collection on the collector array and the aspect ratio have been studied. The results show that there is an optimum aspect ratio to maximize the solar energy collection on the collector arrays. The optimum aspect ratios of the collector array covering a floor area of 1000 m2, 500 m2, 200 m2 and 100 m2 for Beijing are 10/1, 5/1, 5/1 and 3/1, respectively. For the sake of convenient applications, the optimum aspect ratios of five types of collector arrays with different floor area used in 13 cities in China are given.

Sign in / Sign up

Export Citation Format

Share Document