In this study, the change of cooling water temperature (72, 85, 95 ℃) and engine speed (1,800, 2,000, 2,200, 2,400rpm) were experimentally investigated to confirm the operation performance characteristics of auxiliary engine for refrigeration unit. The experimental setup consisted of fuel consumption meter, power meter, and heat transfer unit. The operation performances such as BSFC, exhaust temperature, power generation, and engine efficiency of the auxiliary engine showed similar characteristics in the present experimental range, according to the change of cooling water temperatures and rpms. As the torque increased, the BSFC decreased significantly and the exhaust temperature increased. The power generation increased linearly and the efficiency was insignificant at more than 40 Nm torque.

Shape optimization is needed to enhance the performance or efficiency of many industrial products, for instance, such as small-scale electric parts, automotive design and so on. In, especially, small-scale apparatus with heat transfer, it is not easy to decide optimal shape of apparatus. Therefore, the shape of power auxiliary apparatus in automotive engine was investigated using numerical analysis which includes k- model and unsteady state. The relations between temperature and heat transfer were simulated in case of 3 Type and 3 Point for power auxiliary apparatus. As the results, the heat transfer was decreased due to flow recirculation in case of Type-1. Further high temperature did not always mean high heat transfer when the shape interacted with surrounding fluid.