A Study Of Industrial Wireless Sensor Networks With Thermoelectric Energy Harvesting

Wireless sensor networks(WSNs)have been widely used in environmental monitoring,building safety monitoring and other fields.It has begun to penetrate into the industrial field with the advantages of low cost,self-organization,easy installation,etc.Compared with the traditional wired system,the equipment condition monitoring system which is constructed by the industrial wireless sensor networks(IWSNs)has the advantages of low cost,convenient installation and so on.However,at present,the IWSNs nodes are battery powered,battery capacity and node lifetime are limited.Frequent replacement of the battery will greatly increase the work load of the system maintenance,which has become a key factor restricting the application of IWSNs promotion.Using energy harvesting technology,take the environment of other forms of energy into the use of electricity for the node,such as heat,vibration,etc.It is a new method to solve the power supply problem of IWSNs node in recent years.The research in this field has important theoretical and practical application value.Taking into account the existence of a large number of the hot wall of the power plant and other large industrial enterprises,it can provide a sufficient heat source for the thermoelectric energy harvesting.This paper mainly studies the IWSNs based on thermoelectric energy harvesting.The specific work of this paper as follows:1.Based on the understanding and analysis of the thermoelectric module working principle and internal parameters,thermoelectric module of TGM-287-1.0-1.3 is selected as the research object.The thermoelectric module model is established on the finite element software,make the simulation experiments.The cold and hot end temperature difference of the thermoelectric module is analyzed under different temperature conditions,and the output characteristics of the thermoelectric module of the fixed temperature difference are also analyzed under different load resistance.2.In view of practical application,the output voltage of the thermoelectric module is small,the output power of the thermoelectric module is not high and easy to fluctuate.The design and development of a novel thermoelectric energy harvesting system supply power for IWSNs node.The system includes two parts,the thermoelectric power collection device and the electric energy conversion circuit.Thermoelectric energy collection device is mainly composed of insulation materials,copper heat sink and auxiliary device.The electric energy conversion circuit is mainly composed of boost circuit,super capacitor,buck circuit and so on.3.The thermal wall temperature monitoring system of self-powered IWSNs based on thermoelectric energy harvesting is designed and developed.The system includes the End-Device node,Coordinator node,PC.The End-Device node is composed of K type thermocouple,amplifier circuit,JN5139 Jennic module and so on.The hot wall temperature is measured by the End-Device node that is uploaded to the host computer display through the Coordinator node.4.A corresponding experimental platform was built,and a large number of test and verification work was carried out on the research and development of the self-powered IWSNs hot wall temperature monitoring system based on Thermoelectric Energy Harvesting.The experimental results show that the designed system has achieved the expected requirements.When the temperature of the hot wall is 67oC,the indoor temperature of 19oC,the End-Device node sampling interval is 16 s.Thermoelectric energy harvesting system collected energy corresponding with IWSNs terminal node energy consumption can reach the balance,to achieve self-powered IWSNs node.