Conversion of Waste Heat Energy of Internal Combustion Engine into Electricity by Using Thermoelectric Generator | Chapter 1 | Engineering Research: Perspectives on Recent Advances Vol. 6

Heat engine converts chemical engines available in the fuel to useful mechanical energy. One of the most famous heat engines is the internal combustion (IC) engine. IC engine plays a pivotal role in transportation and other industrial applications. A lot of waste heat is rejected from a typical IC engine as the conversion efficiency of this type of engine is only about 35-40 %. The average temperature of the exhaust system of a typical IC engine is in the range of 300°C to 500°C. The waste heat has the potential to be tapped and converted into useful energy. This can help to increase the performance of the IC engine system. A thermoelectric generator (TEG) can be used to recover the waste heat from the IC engine to electrical power. It can convert directly thermal energy into electrical energy. This work focused on the conversion of the waste heat energy of the IC engine into electricity by using TEG. The aim of the project was to demonstrate the applicability of TEG to convert waste heat from exhaust to useful electrical energy. A test bench was set up to experiment and obtain the power output from TEGs from waste heat recovery from an IC engine. Two TEGs were individually tested to attain the electrical characterization and also tested on series and parallel connections. The thermocouple wires were connected to gain the reading of the temperature at the exact points. The study showed that the series connection of TEGs has improved and increased voltage generation but the parallel connection is more reliable. The result shows that multi-TEG in the system gave the best result of electrical characterization compared to individual TEG. The system proved that waste heat recovery using TEGs has tremendous application in IC engines for better and higher efficient engine performance. TEG was able to receive 80.1°C of maximum hot temperature and 58.1°C of cold temperature supplied by air cooling.

 

Author (s) Details

 

Nor Amelia Shafikah Mat Noh
School of Mechanical Engineering, College of Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia.

 

Baljit Singh Bhathal Singh
School of Mechanical Engineering, College of Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia.

 

Muhammad Fairuz Remeli
School of Mechanical Engineering, College of Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia.

 

Amandeep Oberoi
Department of Mechanical Engineering, Thapar Institute of Engineering and Technology, Patiala, India.

 

 

Please see the book here:- https://doi.org/10.9734/bpi/erpra/v6/4044

Energy Savings through Retrofitting Waste Heat Recovery System on Bulk Milk Cooler | Chapter 9 | Theory and Applications of Engineering Research Vol. 5

This study highlights about energy savings through retrofitting waste heat recovery system on bulk milk cooler. Various types of heat exchangers are being used for recovering waste heat in which tube in tube type are the most common. Bulk milk coolers are used to chill the milk from its harvest temperature of 350C to 40C to arrest the bacterial growth and maintain the quality of harvested milk. Milk chilling practices are energy intensive with low coefficient of performance (COP) of about 3.0. Increased energy cost concern encouraged an investigation of heat recovery from bulk milk cooler as one conservation alternative for reducing water heating cost in dairy industry. Heat dissipated to atmosphere through condenser is recovered to improve the energy efficiency of plant. The waste heat is utilized to heat the water which is used to clean the milk processing equipment’s thus saving thermal or electrical energy used to heat the water separately. Shell and coil type heat exchanger is designed and used to recover the waste heat during condensation process. Heat rejected in condensation process consists of superheat and latent heat of the refrigerant. In this work, attempt has been made to recover complete superheat along with part of latent heat which is a present research issue. Various types of heat exchangers are being used for recovering waste heat in which tube in tube type are the most common. The results show that complete superheat and 35% of latent heat is recovered. Heat recovery rate is measured for various mass flow rates. Water is flowing on shell side and refrigerant through tubes. The effectiveness of the heat exchanger is determined and the results achieved are presented in this paper. Significant improvements have been achieved and COP of the system is increased from 3 to 4.8.

After conducting trials on the experimental setup developed in the lab, it is found that there is significant energy saving & performance enhancement as a whole system. This is implemented as a pilot project in field on one of the bulk milk cooler of a dairy plant in Maharashtra, India which is satisfactorily working with good results and less ROI.

Author(s) Details:

S. M. Pise,
Kolhapur Institute of Technology’s College of Engineering (Autonomous), Kolhapur, Maharashtra, India.

D. V. Ghewade,
Dr. A. D. Shinde College of Engineering, Gadhinglaj, Maharashtra, India.

S. N. Sapali,
Department of Technology, Shivaji University, Kolhapur, Maharashtra, India.

P. S. Pise,
D. Y. Patil College of Engineering (Autonomous), Kasba Bawada, Kolhapur, Maharashtra, India.

Please see the link here: https://stm.bookpi.org/TAER-V5/article/view/13342