scholarly journals Passive generation from a novel thermoelectric energy harvesting system model integrated with phase change material

2019 ◽  
Vol 111 ◽  
pp. 03060
Author(s):  
Yoo-Suk Byon ◽  
Hansol Lim ◽  
Yong-Kwon Kang ◽  
Soo-Yeol Yoon ◽  
Jae-Weon Jeong
Keyword(s):  
Phase Change ◽  
Temperature Profile ◽  
Phase Change Material ◽  
Temperature Difference ◽  
Wall Temperature ◽  
Waste Heat ◽  
Thermoelectric Energy ◽  
Temperature Method ◽  
Thermoelectric Energy Harvesting ◽  
Change Material

The purpose of this research is to evaluate the performance of a novel model that incorporates a thermoelectric generator (TEG) and phase change material (PCM). The proposed model passively generates electricity using waste heat that accumulates at exterior wall surfaces. The main generator is a TEG. To maintain the temperature difference between the two sides of the TEG, PCM is located at its cold side—thus converging the heat transferred into latent heat. The proposed passive generation system is formed into a TEG-PCM block. The block can be stacked to form a wall or inserted into any part of a building that faces the sun. The experiment setup is based on a constant temperature method. The wall temperature profile is set according to solar radiation, convection, and radiative heat transfer. To replicate daily wall temperatures during the experiment, a heat plate is used to match a wall temperature profile. Step control was used for the heating plate. The resulting data shows the average temperature difference between the hot and cold sides of the TEG to be 10-20°C. The peak generated electricity was 0.08 W for a single module.

A Smart PV Cooler Based on Solar Thermoelectric Generator with Phase Change Material

2014 ◽  
Vol 986-987 ◽  
pp. 1163-1168
Author(s):  
Qi Zhang ◽  
Amen Agbossou
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Thermoelectric Generator ◽  
Photovoltaic Cell ◽  
Typical Application ◽  
Wireless Receiver ◽  
Thermoelectric Energy ◽  
Thermoelectric Energy Harvesting ◽  
Solar Thermoelectric Generator ◽  
Change Material

This paper presents a typical application for a newly developed thermoelectric energy harvesting system. The proposed solar thermoelectric generator (TEG) operates with phase change material (PCM) day and night. An energy management system was connected with the TEG to increase the output voltage while the harvested power was used to drive a wireless transmitter. The wireless receiver controlled the switch of a water tap which functions as a smart cooler of a photovoltaic cell. This study demonstrates a way of using micro-energy to improve macro-energy production smartly.

scholarly journals Efficient storage and recovery of waste heat by phase change material embedded within additively manufactured grid heat exchangers

2021 ◽  
Vol 181 ◽  
pp. 121846
Author(s):  
Maryam Roza Yazdani ◽  
Alpo Laitinen ◽  
Valtteri Helaakoski ◽  
Lorant Katona Farnas ◽  
Kirsi Kukko ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Heat Exchangers ◽  
Waste Heat ◽  
Efficient Storage ◽  
Change Material

The Fundamentals of Sliding Contact Melting and Friction

1989 ◽  
Vol 111 (1) ◽  
pp. 13-20 ◽  
Author(s):  
A. Bejan
Keyword(s):  
Phase Change ◽  
Friction Factor ◽  
Phase Change Material ◽  
Relative Motion ◽  
Temperature Difference ◽  
Normal Force ◽  
Frictional Heating ◽  
Contact Melting ◽  
Sliding Contact ◽  
Change Material

This paper focuses on the phenomenon of melting and lubrication by the sliding contact between a phase-change material and a smooth flat slider. The first part of the study considers the limit in which the melting is due primarily to “direct heating,” that is, to the temperature difference between the solid slider and the melting point of the phase-change material. It is shown that in this limit the relative motion gap has a uniform thickness and that the friction factor decreases as both the normal force and the temperature difference increase. The second part considers the limit where the melting is caused mainly by the frictional heating of the liquid formed in the relative motion gap. This gap turns out to have a converging-diverging shape that varies with the parameters of the problem. As the normal force increases, a larger fraction of the melt is pushed out through the upstream opening of the relative motion gap. Means for calculating the melting speed, the friction factor, and the temperature rise along the slider surface are developed.

Phase Change Material as Pump in an Organic Rankine Cycle

2014 ◽  
Vol 575 ◽  
pp. 662-667
Author(s):  
Barghav Subramony Hariharan ◽  
Kaushik Suresh
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Electrical Energy ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Change Material

Organic Rankine Cycles (ORC) is predominantly used in waste heat recovery applications because of their low temperature working range. The main efficiency enhancement operation in an Organic Rankine Cycle is reducing the pump work .The pump converts electrical energy to flow energy. This input reduced and output maintained at the same level gives us a more efficient waste heat recovery system. The pump work can also be achieved by using a material that has the ability to expand on heating and revert back to its original state on cooling. The expansion property of the material is used to compress and drive the operating fluid through the cycle. Material that was observed to possess such properties was Phase Change Material. Conventionally PCM were used as thermal storage to preheat the working fluid in an ORC but a novel idea is to make the PCM utilize the heat rejected from the condenser and do the pump work. This paper discusses the various desirable properties of PCM to perform pump work efficiently and also the general layout and working of ORC system using PCM. The working fluid selected is toluene

scholarly journals Thermal Characterization of a Heat Management Module Containing Microencapsulated Phase Change Material

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2164
Author(s):  
H.M. Shih ◽  
Yi-Pin Lin ◽  
L.P. Lin ◽  
Chi-Ming Lai
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Wall Temperature ◽  
Heat Dissipation ◽  
Thermal Protection ◽  
Core Material ◽  
Heat Management ◽  
Microencapsulated Phase Change Material ◽  
Aluminum Honeycomb ◽  
Change Material

In this study, a heat management module containing a microencapsulated phase change material (mPCM) was fabricated from mPCM (core material: paraffin; melting temperature: 37 °C) and aluminum honeycomb structures (8 mm core cell). The aluminum honeycomb functioned both as structural support and as a heat transfer channel. The thermal management performance of the proposed module under constant-temperature boundary conditions was investigated experimentally. The thermal protection period of the module decreased as the Stefan number increased; however, increasing the subcooling factor could effectively enhance the thermal protection performance. When the cold-wall temperature TC was fixed at 17 °C and the initial hot wall temperature was 47–67 °C, the heat dissipation of the module was complete 140 min after the hot-wall heat supply was stopped. The time required to complete the heat dissipation increased to 280 min when TC increased to 27 °C.

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