In this paper, anew hybrid energy converter is designed which consists of a Thermoelectric Generator (TEG) unit and aTriboelectric Nanogenerator (TENG) unit. The device can harvest solar energy and wind energy from the environment individually or simultaneously, and utilize them as the energy source of sensors and wireless transmission equipment in the system. When working individually, the TENG unit can achieve 244 V output voltage and 35 Aoutput current from wind energy of 12m/s. The output voltage of 4.27 V and the output current of 328 mA can be obtained from the solar thermoelectric unit at the hot end temperature of 110°C. According to the experimental data of capacitor charging by hybrid energy converter, compared with TEG unit and TENG unit individually, the charging voltage of the proposed device increases by 93.3% and 28.9%, respectively, and successfully drives Bluetooth module and realizes wireless data transmission. Compared with the traditional method, the proposed unit achieves not only hybrid energy harvesting but also better output performance. It is an important exploration for the development of self-powered sensors in the future intelligent Internet of things.

The waste heat of ships has the characteristics of large temperature gradient, huge recoverable amount and various properties. Traditional technologies such as thermoelectric power generation (TEG) and organic Rankine cycle (ORC) are difficult to take into account the different characteristics of the various types of waste heat from ships. In order to realize the efficient cascade utilization of various waste heat from ships, improve the efficiency and meet the stringent requirements of the new international carbon emission regulations, a cascade recovery system of ship waste heat based on TEG-ORC (thermoelectric power generation/organic Rankine cycle) is proposed in this paper. After designing of the TEG-ORC combined cycle experimental system, the simulation research has also been carried out. The effects of TEG bottom cycle scale, ORC working medium flow rate and evaporation pressure on system net output power, system power generation cost and bottom cycle ratio (Q_TEG/Q_ORC) are studied. The results show that the TEG-ORC combined cycle overcomes the limitation of single waste heat utilization method, realizes multi-stage utilization of ship waste heat, as well as improves the utilization of waste heat. Of course, the stability and safety of ORC bottom cycle operation are also promoted. The simulation results show that when the TEG bottom cycle scale is 22 pieces, ORC working medium flow rate is 0.44 kg/s, and ORC working medium evaporation pressure is 2.2MPa, the system economy is optimal. At this time, the system power generation cost is 0.26 $/kW·h, the system net output power is 2520.3 W, and the thermal efficiency is 23.33%.