Thermal analysis of a solar conical receiver under different flow directions

抄録

Solar cavity receiver has better thermal performance, but bears large thermal stress. To ensure the safe and efficient operation of the receiver, it is necessary to study its thermal performance and thermal stress characteristics. In this paper, the thermal model and mechanical model were built for the conical cavity receiver with built-in helical tube. Based on these models, the influence of flow directions (up-flow and down-flow) and direct normal irradiance (DNI) on thermal performance and thermal stress of the receiver were investigated by numerical simulation. The results showed that the thermal performance of the solar receiver in up-flow was always better than that in down-flow, but the maximum thermal stress was larger than that in down-flow. The increase of DNI can improve the thermal performance of the receiver, but it also increased the thermal stress of the receiver.