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The SCORE thermoacoustic engine (TAE) depends of an external heat source from the waste heat of wood burning stove or propane gas. The overall efficiency of TAE depends a lot on the efficiency of the heat transfer process from the cooking stove to the regenerator. It is important to supply most of the heat to the engine directly to the regenerator top surface for best performance of the engine. The combined and complex mode of heat transfer from the cooking stove to the engine makes this task extremely difficult to be achieved. In this work analytical calculations are used to calculate from the fundamentals the radiation heat transfer from two types of heat exchangers used by the SCORE project to transfer heat from the external heat source to the engine. The objective of this study is to understand and evaluate the proportions of heat transferred from the inner side of the external hot surface to the engine. A detailed analysis of the view factors, the surface and space resistances were conducted to calculate the radiation heat transfer in each case at different temperatures. The results obtained showed the actual radiation performance of each part of the convolution and the bulge. Although the convolution performed better in terms of the total heat transfer, but the bulge showed higher radiation. The analytical results were compared with the published numerical results

Radiation Heat Transfer between the Externally Heated Surface and the Regenerator of the Thermoacoustic Engine