| 1. |
- Beckert, Rolf, et al.
(författare)
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Measurement comparison of InGaAs- and GaSb-based (thermo-)photovoltaic cells with two different methods
- 1998
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Ingår i: Second World Conference on Photovoltaic Solar Energy Conversion. - Wien, Österrike.
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Konferensbidrag (refereegranskat)abstract
- The aim of this investigation is to show, whether totally different calibration methods (absolute spectral response at Fraunhofer ISE, blackbody at various temperatures at SERC) give similar results for the performance of TPV cells under infrared spectra. Two cell types (InGaAs and GaSb) have been tested, applying two different methods to each cell type. Spectral responses and I-V-curves of the cells have been measured. To compare the two methods the spectra of a halogen light bulb were measured up to 1.6 µm at different lamp currents and then fitted to the Planck formula and in this way extended into the infrared. The two methods are compared to each other and results are discussed. It is shown that the I-V-curves of both cell types are independent of the used spectrum. The currents of the cells measured at SERC and calculated at Fraunhofer ISE differ only in the range of measurement errors.
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| 2. |
- Beckman, William A, et al.
(författare)
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TRNSYS, the most complete solar energy system modeling and simulation software
- 1994
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Ingår i: Renewable energy. - 0960-1481 .- 1879-0682. ; 5:1-4, s. 486-488
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Tidskriftsartikel (refereegranskat)abstract
- The five computer programs TRNSYS, PRESIM, TRNSED, ONLINE, and PREBID have been put together into a program package which is the most complete solar energy system modeling and simulation software that is available today.
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| 3. |
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| 4. |
- Broman, Arne, et al.
(författare)
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Museum exhibits for the conics
- 1994
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Ingår i: Mathematics Magazine. - Washington, DC, USA : Mathematical Association of America. - 0025-570X .- 1930-0980. ; 67:3, s. 206-209
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Tidskriftsartikel (refereegranskat)abstract
- It is rather common nowadays that museums, especially those of the "science center" type, have showcases where visitors can perform experiments. In the Futures' Museum in Borlänge we have made an exhibit where interested persons can construct parabolas. In this note we describe this showcase. Analogous exhibits can be made for constructing ellipses and hyperbolas.
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| 5. |
- Broman, Lars, et al.
(författare)
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A low-cost versatile solar hot water system for school laboratory work
- 1997
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Ingår i: North Sun'97. - Helsingfors, Finland.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A versatile low-cost solar hot water collector for school laboratory work has been constructed. It consists of a 4 dm2 absorber connected to an 80 cc storage tank. It is a complete system that works by means of thermosiphon convection of the water. A number of experiments and observations for students from kindergarden to college level are proposed.
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| 6. |
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| 7. |
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| 8. |
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| 9. |
- Broman, Lars, et al.
(författare)
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Astronomical interactive exhibits
- 2002
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Ingår i: 16th International Planetarium Society Conference. - Wichita, KA, USA.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- It has been shown (Franck Pettersen, Master thesis 1995) that a planetarium show has a much larger educational impact if it is accompanied by hands-on experimenting. In the present paper, a number of interactive exhibits that we have used together with Stella Nova Planetarium at Falun Science Center and at Teknoland are presented.
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| 10. |
- Broman, Lars, et al.
(författare)
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Co-generation of electricity and heat from combustion of wood powder utilizing thermophotovoltaic conversion
- 1994
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Ingår i: First NREL Conference on Thermophotovoltaic Generation of Electricity. - Copper Mountain, CO, USA.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The development of a thermophotovoltaic converter that uses combustion of wood powder as energy source has started with development of the combustion source. During the last few months, we have constructed and tested a feeding mechanism and a combustion chamber that seem very promising. We manage to keep a 10 kW flame steadily burning for several minutes at the time, generating a temperature exceeding 1400 K. The plans for continued development of this and other components of the converter are discussed in the paper.
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