An animation tool for demonstrating the importance of edge filters in thermophotovoltaic applications

Lindberg, Eva; Broman, Lars

doi:10.1016/s0960-1481(02)00224-0

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…The combustion unit can be a conventional boiler extended with a TPV-unit where heat and electricity are produced simultaneously. The principles for a TPV unit developed by Malardalen University together with Dalarna university college in Borlange is principally making use of photons produced by combustion flames heating a steel plate, the emitter [1], [2], [3] and [4]. The photons produced are then filtered in an energy glass, and thereby only the energy rich ones hit a PV-cell, but with a slightly lower band gap than normal PV-cells.…”

Section: Conversion Of Biomass To Heat and Electric Power Using Tpvmentioning

confidence: 99%

Combined Solar Power and TPV

Dahlquist

Karlsson

Lindberg

2011

Linköping Electronic Conference Proceedings

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In this paper design for a combined TPV and solar power system for local heat and power production is discussed. PV cells are producing electricity when there is light, while TPV cells are used when it is dark. Biomass is combusted and the heat is generating photons for the TPV system. Higher combustion temperature will give higher electric output, but also faster deterioration of the materials in the combustor, where the temperature of the emitter is 1050-1250 o C. By combining PV-cells generating electric power summer time with TPV-cells generating electric power winter time, we can achieve a flexible local heat and power system all year round. As both systems generate DC-power, we also can see a potential to use the same DC components for e.g for charging batteries for electrical vehicles, DC-pumps, LED-lamps etc. Design criteria for the systems are discussed in this paper for a house that is principally self sufficient on energy. Both theoretical and practical obstacles are discussed, as there are a number of issues to solve before the technique can be used in "real life". The TPV system is not yet commercially available, but is tested in pilot scale.

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Section: Conversion Of Biomass To Heat and Electric Power Using Tpvmentioning

confidence: 99%

Combined Solar Power and TPV

Dahlquist

Karlsson

Lindberg

2011

Linköping Electronic Conference Proceedings

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“…The previously presented [3] animation programs have been further improved by using eleven factors that can be varied independently; see At the calculation sheet, one more set of factors can be varied (see Figure 11): the emission from the emitter given as five constants as functions of wavelength.…”

Section: The Tpv Generator Animatormentioning

confidence: 99%

“…Interference filters (edge filters) can be designed to get a very good spectral selectivity, but they are sensitive to the incident angles, the edge is shifted substantially when the angle of incidence is changed, and the edge gets less steep when the range of incidence angles increases [1]. In our previous research [2], it has been shown that decreasing the angular distribution to half may increase the overall generator availability by up to 15% compared to no tailoring of incident angles Therefore, a geometry that limits the angular distribution of the radiation incident onto the filter has been designed [3],. Figure 1 shows a basic TPV system including a selective filter, a non-imaging collimator and a non-imaging concentrator A collimator rectifies the emitted radiation.…”

Section: Introductionmentioning

confidence: 99%

Animation Tool and Q.E. Measurements for Estimating the Optimum System Efficiency of a TPV Generator

Lindberg¹

2004

AIP Conference Proceedings

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In order to achieve high efficiency in a thermophotovoltaic (TPV) generator, it is important that a high fraction of emitted photons with energies below the TPV cell band gap are reflected back to the emitter. This can be accomplished in several ways, and one possibility is to place an edge filter between the emitter and the TPV cell array in an elliptical optic design. By this arrangement the cooling demand on the TPV cells is reduced and the reflected radiation is reused in the emitter, the fuel demand is decreased. An animation tool, developed in the Excel  program, for determining the optical availability in such a system has been presented previously. The animation components were a blackbody emitter, an adjustable edge filter, and an array of TPV cells. The tool was used to demonstrate the importance of an efficient filter and the usefulness of optics that makes the edge of the filter as sharp as possible.In such a system the TPV cells are the dominant cost. It is possible to tailor the selective filter in order to fit the bandgap of a certain TPV cell. For this purpose it is a great advantage to be able to measure the Quantum Efficiency Q.E. of the cell and how Q.E. changes at different temperatures. When this behaviour is known it is possible to tailor the selective edge filter in order to get higher efficiency. A simple measurement setup has been developed utilizing a lamp with IR reflector, a monochromator, a radiometer, and a heating system based on hot water.The animation tool has been further developed for estimating the optical efficiency, and more factors may be varied. The tool can now handle also the emittance of the emitter, absorption losses in mirrors and filter, as well as TPV cell characteristics such as adjustable Q.E., fill factor FF, and U oc /(E g /q).

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