Design methodology and computational fluid analysis for the printed circuit steam generator (PCSG)

To introduce the printed circuit steam generator (PCSG), the design methods were developed, and the CFD analysis was performed. The design considerations were divided into three parts: thermal sizing, structural integrity evaluation, and specific design for water channels. The thermal sizing was performed by a 1D heat transfer analysis and the channel length was increased until it satisfied the target thermal power. The structural integrity was evaluated based on the ASME code and the calculated stresses were compared to the allowable stress. The flow instability, flow maldistribution, and fouling have negative effects on the performance. In order to prevent such phenomena, the mixing channel and orifice were designed. The CFD analysis on the final design of the PCSG was performed to evaluate the steam state at the outlet and flow distribution. Although a flow maldistribution (∼12 %) was observed, the steam state at the outlet was satisfied with the operating conditions.