Category EuroSun2008-5

AN EXPERIMENTAL ANALYZE OF A SOLAR COLLECTOR

G. Zorer Gedik1* and A. Koyun2

1Yildiz Technical University, Architecture Faculty Istanbul /Turkiye
2Yildiz Technical University, Mechanical Engineering Fac., Istanbul /Turkiye,
Corresponding Author, gzorer@hotmail. com

Abstract

In this study the experimental results of a solar energy collector which is installed to a south classroom window of a school in Istanbul are presented. The collector unit had been tested experimentally and numerical to determine its thermal performance before its integration into the south window. In this paper, the experimental analyze will be given in detail. The collector is tested using infrared radiation lamps in the laboratory. The collector reaction to change in the value of heat transfer is measured...

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Automatic Control System

The whole automation system is mainly divided into two parts: one part is the hardware equipments consisted of all kinds of devices used in the testing system; the other part is the software program based on Labview language. I/O device is used to connect hardware with software. Through the automation system the test system need to be operated normally and accurate measurement is also acquired. Because of the strict requirements under the test conditions according to ISO 9459-2, the system needs to accurately identify solar time and determine the test process whether it is in a exactly true position in sequence. At the same time data acquisition system will be operated to collect and record data with real-time curve of all sorts of signals...

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The application of the regulations minimal solar collector area

Following the new regulations, a three bedrooms autonomous zone must have a minimal collector area of 4 m2 independently of the climate zone were is located. From the simulations results mentioned in chapter 5.4 we took the maximum value for Esolar that was 2083kWh/year in Alandroal (I1V3). What happens if we would like to reach on the others localities the same energy achieved in this one? The results have showed that just one location can reach almost that value with the minimal required area (4 m2), the other need more area (Fig 2.). It was made also calculations to see what the maximal SCA without having significant energy dissipations (overheating)...

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Measured sequences used for validation purposes

The comparison of experimental and calculated instantaneous power results, obtained after the different approaches presented in the previous section, is based on instantaneous efficiency measurements for a CPC collector (C = 1.72), as well as on their corresponding steady-state and dynamic efficiency curve parameters. The measurements were made at the Institute for Thermodynamics and Thermal Engineering (ITW) of the University of Stuttgart, Germany.

Two measurement periods were chosen, allowing the validation of power calculation methodologies under different radiation conditions. Values of radiation measured on the collector aperture plane (tilt = 48°, azimuth = 5°, latitude = 50°, albedo = 0...

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First results of the implementation of QD test methodology

4.1. Test of a flat plate collector

A selective flat plate collector was tested according to QD test methodology. In order to analyse the test sequences, graphs were generated according to the recommendations of the standard EN 12975-2 section 6.3. These graphs are represented in Fig. 1.a), b) and c).

image180

Analysis of the graph in Figure 1a) shows that the test was conducted within the expected working temperature range of the collector. This meets the requirement to have at least 4 fluid inlet temperatures evenly spaced in the collector’s working temperature range. One of the tests was conducted under conditions in which the collector’s mean fluid temperature stood at ± 3 K of ambient temperature, around solar noon, so as to make possible a precise determination of n0.

The paramete...

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Fault diagnostic method for a water heating system based on. continuous model assessment and adaptation

Sylvain Lalot[1]*, Soteris Kalogirou[2], Bernard Desmet1, and Georgios Florides2

1LME, Universite de Valenciennes et du Hainaut Cambresis, Le Mont Houy,

59313 Valenciennes Cedex 9, France

2Cyprus University of Technology, P. O. Box 50329, 3603 Lemesos, Cyprus
* Corresponding author, sylvain. lalot@univ-valenciennes. fr
Abstract

The objective of this work is the development of an automatic solar water heater (SWH) fault diagnostic system (FDS). The latter consists of a modelling module and a diagnosis module. A data acquisition system measures the temperatures at four locations of the SWH system (outlet of the water tank; inlet of the collector array; outlet of the collector array; inlet of the water tank)...

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A Long Term Test of Differently Designed Evacuated Tubular Collectors

J. Fan*, J. Dragsted, S. Furbo

Department of Civil Engineering, Technical University of Denmark,

Brovej 118, DK 2800, Kgs. Lyngby, Denmark
Corresponding Author, iif@byg. dtu. dk
Abstract

During three years seven differently designed evacuated tubular collectors (ETCs) utilizing solar radiation from all directions have been investigated experimentally. The evacuated tubular solar collectors investigated include one SLL all-glass ETC from Tshinghua Solar Co. Ltd, four heat pipe ETCs and one direct flow ETC from Sunda Technolgoy Co. Ltd and one all-glass ETC with heat pipe from Exoheat AB. The collectors have been investigated side-by-side in an outdoor test facility for a long period...

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Set up of the test facility

One aim of the newly developed all-in-one test facility is to combine all three test methods in a single test facility. This test facility must be able to fulfil all requirements and qualifications result­ing from the above mentioned standards.

The housing of the test facility is a conventional 20 foot office container. In this container the hy­draulics of the temperature unit as well as the measuring equipment and the data logging instru­ments are located. In order to operate the facility independent from a cooling network, a chiller combined with a 600 litre cold water store is installed. With the exception of the chiller, all com-

Подпись: Fig. 1: Arrangement of major components (bird's view)

ponents are located inside the container. Figure 1 shows the schematic layout of the major compo­nents.

The facility is designed in such a way that...

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