Abstract. The ancient city wall contains rich cultural values. Due to environmental and human factors, there are many diseases in the ancient city wall: bulging, cracking, etc., which will lead to the collapse or even death of the ancient city wall. Therefore, the monitoring and protection of the ancient city wall is imminent. This paper proposes a new scheme for bulging monitoring for wall bulging. The feature plane is fitted according to the actual scan data, the degree of bulging, the trend and the area size are determined, and the bulging deformation of the city wall is displayed in the form of an image. Simplify workflow, improve data processing efficiency, and display more intuitively.

As an efficient energy conversion technology, the organic Rankine cycle (ORC) has been widely applied in medium- and low-grade heat sources. In order to explore the experimental performance of ORC and reveal the effects of operation parameters, an experimental setup was built and R123 was selected as the working fluid. In the experiments, the heat source temperature as well as the mass flow rates of the working fluid and cooling water were controlled. Under the design conditions, the net work and cycle efficiency can, respectively, reach up to 0.55 kW and 8.7%. As for the influences of key parameters, with the increase in heat source temperature from 130 °C to 160 °C, the involved heat has a small increase, while the net work increases from 0.44 kW to 0.55 kW, and the cycle efficiency greatly increases from 6.71% to 8.72% at a mass flow rate of working fluid 25 g/s. As for the mass flow rate of cooling water, it has a similar impact on the cycle performances. The difference is that the effect of the cooling water rate is relatively smaller. At the mass flow rate 25 g/s, when the cooling water rate increases from 0.68 kg/s to 0.83 kg/s, the net work varies from 0.46 kW to 0.55 kW, the cycle efficiency increases in the range 7.41~9.4%. Furthermore, except cycle efficiency, all performances are proportional to the mass flow rate of working fluid. In the test range, the difference of cycle efficiency among different mass flow rates is less than 0.7%.