Measurements of the active properties of a Dayem micro-bridge at X-band frequencies is described. The bridge was mounted in a microwave cavity designed to match the bridge properly and the microwave output from the cavity was detected using a sensitive X-band spectrometer. Micsowave power was detected from the freely running Josephson oscillations with the bridge dc-biased to emit at the receiv...

Open cavity receivers can be used to efficiently absorb concentrated solar radiation at high temperatures. Using ray-tracing and a stochastic optimisation method, the geometry of such receivers is optimised looking at radiative losses only. Results confirm the major role of the aperture in cavity losses mitigation and highlight the flux distribution variation on geometries with comparable radia...

2 BEng(Hons), PhD student, RSE, ANU. 3 BEng, Occupational Trainee, RSE, ANU. 4 Professor, School of Mathematical and Geospatial Sciences, RMIT University, GPO Box 2476 Melbourne 3001, Australia 5 BE(Hons)/BSc, PhD, Lecturer, RSE, ANU. 6 BSc (Eng), MSc (Eng), Engineer. Abstract This paper describes the development of ray tracing models for a 500 m dish concentrator. Two distinct types of model h...

A cylindrical cavity-receiver containing a tubular absorber that uses air as the heat transfer fluid is proposed for a novel solar trough concentrator design. A numerical heat transfer model is developed to determine the receiver’s absorption efficiency and pumping power requirement. The 2D steady-state energy conservation equation coupling radiation, convection and conduction heat transfer is ...

The ANU 500 m dish has been in operation since 2010 with a mono-tube steam cavity receiver, the SG4 system for the production of steam used for electricity generation. Dynamic modelling of this system is crucial for achieving robust control and optimised performance. This paper presents ongoing work with the dynamic modelling and simulation of a mono-tube steam cavity receiver for direct steam ...

This study examines experimentally the heat loss from a model solar cavity receiver. For this purpose, laboratory-scale cylindrical cavity models with geometric aspect ratios (cavity length to diameter) of 1 and 2, and aperture opening ratios (aperture diameter to cavity diameter) of 0.5 and 1, were built. Each cavity was subjected to constant boundary heat input via heating cables, and was ope...