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Publication Title | TEST OF A SOLAR-HYBRID MICROTURBINE SYSTEM AND EVALUATION OF STORAGE DEPLOYMENT

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TEST OF A SOLAR-HYBRID MICROTURBINE SYSTEM AND EVALUATION OF STORAGE DEPLOYMENT

Lars Amsbeck1, Thorsten Denk2, Miriam Ebert3, Christian Gertig4, Peter Heller3, Patrik Herrmann3, Jens Jedamski1, Joachim John5, Robert Pitz-Paal6, Tobias Prosinečki7, Jonny Rehn8, Wolfgang Reinalter3 and Ralf Uhlig1

1German Aerospace Center (DLR), Institute of Technical Thermodynamics, Solar Research, Pfaffenwaldring 38-40, 70372 Stuttgart, Germany, +49-711-6862-306, Lars.Amsbeck@dlr.de

2 CIEMAT, Plataforma Solar de Almeria, Spain

3German Aerospace Center (DLR), Institute of Technical Thermodynamics, Solar Research, Plataforma Solar de Almeria, Spain

4Abengoa Solar New Technologies, Sevilla, Spain

5GEA Technika Cieplna Sp. z o. O, Opole, Poland

6German Aerospace Center (DLR), Institute of Technical Thermodynamics, Solar Research, Cologne, Germany 7Royal Institute of Technology (KTH), Stockholm, Sweden

8Turbec, Malmö, Sweden

Abstract

A solar-hybrid microturbine system using a tube receiver and a Turbec T100 was tested at the Plataforma Solar de Almería. The design receiver outlet temperature of 800°C was achieved with an open receiver aperture and also using a pressureless quartz window. Measured receiver efficiencies of 39.7% for the open receiver at 782°C outlet temperature and 44% at 803°C outlet temperature for the configuration with the window are much lower than the design values due to design flaws in the cavity insulation and a too low mass flow from the turbine. Nevertheless, the encountered problems are solvable and further lessons learned are given.

For a commercial system design using small heliostats of 1m2-mirror area a peak receiver efficiency of >85% was simulated using a face-down receiver configuration with a much smaller aperture. The solar-hybrid system can also be combined with a pressurized pebble-bed heat storage. For an off-grid application a solar share of 82% was simulated.

Keywords: Solar tower, microturbine, tube receiver, solar-hybrid, heat storage, off-grid

1. Introduction

Diesel generator sets are the major power source in off-grid applications today. In view of roughly 1.6 billion people without electricity worldwide the replacement of Diesel gensets in sunny locations could be a reasonable market for solar-hybrid microturbine systems.

In such a system a commercially available microturbine is connected to a pressurized solar air receiver located on the tower of a small heliostat field. The development of a metallic tube receiver was presented in [1]. A test system was installed at the Plataforma Solar de Almería, Spain. Fig. 1 shows the main components of the system setup: Turbec T 100 microturbine (1), inlet pipe (2), distributor (3), 40 expansion joints (4), 40 absorber tubes with 26.7mm OD and 2.11mm wall thickness, each 2.5m long and equipped with a wire-coil heat transfer enhancement with a wire diameter of 2mm and a pitch of 55mm (5), collector (6) and outlet pipe (7), both with inner insulation, the combustion chamber (8) , the cavity (9) and an optional pressureless quartz window with anti-reflection coating (10). The quartz window consists of 10 strips of 60°-tube segments with the concave side oriented to the heliostats [2]. The strips are installed loosely one beside the other, forming a quasi-flat window.

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