scholarly journals A fundamental study of the thermoelectrochemistry of ferricyanide/ferrocyanide: cation, concentration, ratio, and heterogeneous and homogeneous electrocatalysis effects in thermogalvanic cells

2020 ◽  
Vol 4 (7) ◽  
pp. 3388-3399 ◽  
Author(s):  
Mark A. Buckingham ◽  
Samer Hammoud ◽  
Huanxin Li ◽  
Conor J. Beale ◽  
Jason T. Sengel ◽  
...  
Keyword(s):  
Concentration Ratio ◽  
Waste Heat ◽  
Temperature Gradients ◽  
Fundamental Study ◽  
Heat Temperature ◽  
Cation Concentration ◽  
Homogeneous Electrocatalysis

Thermocells can sustainably generate electricity from waste heat temperature gradients. This study investigates numerous fundamental aspects of thermocells, and how to explain and model such aspects.

Fundamental Study of Waste Heat Recovery in the High Boosted 6-cylinder Heavy Duty Diesel Engine

2015 ◽  
Vol 8 (2) ◽  
pp. 209-226 ◽  
Author(s):  
Takuya Yamaguchi ◽  
Yuzo Aoyagi ◽  
Noboru Uchida ◽  
Akira Fukunaga ◽  
Masayuki Kobayashi ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Heavy Duty ◽  
Fundamental Study ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

scholarly journals Performance analysis on series and parallel circuit configurations of a four-cell thermoelectric generator module design

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Muhammad Hadrami Hamdan ◽  
◽  
Nur Aqilah Mat Som ◽  
Amirul Abdul Rashid ◽  
Gilbert Jugi Jimmy ◽  
...  
Keyword(s):  
Forced Convection ◽  
Thermoelectric Generator ◽  
Waste Heat ◽  
Proton Exchange ◽  
Heating Element ◽  
Low Grade ◽  
Good Prospect ◽  
Heat Temperature ◽  
Module Design ◽  
Parallel Circuit

This study presents a technique in recovering energy from low-grade waste heat of a Proton Exchange Membrane Fuel Cell (PEMFC). The goal is to study the functionality and performance using a multiple cell thermoelectric generator (TEG) module. The test bench consists of a heating element, a test section, and a cooling section. The heating element supplies a hot stream temperature of 53°C and 58°C that represents the waste heat from an actual PEMFC stack. The module comprises four TEG cells with heat pipes coupled with a heat sink system. The main variables were the TEG cooling modes of natural convection (0 m/s) and forced convection (at 5 m/s and 10 m/s) and the series and parallel circuit configurations of the module. At 58°C waste heat temperature, forced convection cooling at 10 m/s gave the highest voltage and power output of 140 mV and 1960 µW. The outputs of the series circuit was 159% higher than the parallel circuit. This initial simple TEG module design has shown that it has a good prospect to compensate for the ultra-low waste heat temperature of a PEMFC. Future designs of the modules need to identify a more optimized approach to improve the outputs and contribute to the long-term sustainability of PEMFC systems.

scholarly journals Experimental Investigation of Innovative Thermal Mechanical Refrigeration System

2021 ◽  
Author(s):  
Ahmad K. Sleiti ◽  
Wahib A. Al-Ammari ◽  
Mohammed Al-Khawaja
Keyword(s):  
Experimental Investigation ◽  
Ozone Depletion ◽  
Waste Heat ◽  
Operating Conditions ◽  
Working Fluid ◽  
Heat Sources ◽  
Heat Temperature ◽  
High Flexibility ◽  
Condition Systems ◽  
Electric Mode

The current electrical refrigeration and air condition systems are considered as one of the major sources for ozone depletion and global warming problems. Furthermore, they consume a large percentage of the worldwide gross production of electricity (around 17%). Therefore, developing new refrigeration systems that might be able to work using renewable sources (solar, geothermal, etc.) and waste heat sources is necessary to address these problems. In this paper, the experimental investigation of an innovative thermal-mechanical refrigeration (TMR) system is presented. The TMR system replaces the electric compressor of the conventional refrigeration systems with an innovative expander-compressor unit (two connected double-acting cylinders). The proposed ECU can be driven by ultra-low heat temperature sources, has simple configuration, and high flexibility for the operating conditions. A hybrid electric-compressor and ECU refrigeration setup was developed to investigate the performance of the ECU and compare it to that of an electric compressor. The experiment was conducted using R134a as a working fluid at different masses. The results show that a maximum COP of 0.57 is obtained at a refrigerant mass of 30g (in electric mode) and a maximum COP of 0.41 is obtained at a refrigerant mass of 60g (in ECU mode).

Energy scavenging from ultra-low temperature gradients

2019 ◽  
Vol 12 (3) ◽  
pp. 1008-1018 ◽  
Author(s):  
Ravi Anant Kishore ◽  
Brenton Davis ◽  
Jake Greathouse ◽  
Austin Hannon ◽  
David Emery Kennedy ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Low Temperature ◽  
Natural Resources ◽  
Thermal Energy ◽  
Waste Heat ◽  
Temperature Gradients ◽  
Environmental Concerns ◽  
Energy Scavenging ◽  
Thermal Energy Harvesting

Thermal energy harvesting from natural resources and waste heat is becoming critical due to ever-increasing environmental concerns.

A Proposal of Waste Heat Recovery System Through Methanol Steam Reforming Integrated With Absorption Heat Pump

2011 ◽  
Author(s):  
Shunsuke Kawasaki ◽  
Willy Yanto Wijaya ◽  
Hirotatsu Watanabe ◽  
Ken Okazaki
Keyword(s):  
Heat Pump ◽  
Reaction Temperature ◽  
Steam Reforming ◽  
Waste Heat ◽  
Methanol Steam Reforming ◽  
Pass System ◽  
Heat Temperature ◽  
Absorption Heat Pump ◽  
Waste Heat Recovery System ◽  
Recovery System

Through the methanol steam reforming (MSR), the energy of low temperature waste heat (100–150°C) can be recovered into that of hydrogen. However, actual MSR requires over 200°C to enable the high conversion of methanol into hydrogen. In this research, two types of combined absorption heat pump (AHP) and MSR systems were proposed: one-pass system and steam recycling system. The role of the AHP is to enhance the temperature level of the waste steam up to 230°C, which is used for the MSR. To evaluate the performances of these systems, “energy enhancement factor” was defined. As a result, the recovered energy of the waste heat was almost three times as much as the required work for the AHP when the reaction temperature and waste heat temperature and S/C ratio were 210°C and 150°C and 4.0, respectively. It was also indicated that the steam recycling was more effective at the higher reaction temperature and lower waste heat temperature and higher S/C ratio.

A Fabrication for Ameliorating Pyroelectric Harvesting Converters

2013 ◽  
Vol 684 ◽  
pp. 438-442
Author(s):  
Chun Ching Hsiao ◽  
An Shen Siao
Keyword(s):  
Temperature Variation ◽  
Waste Heat ◽  
Three Dimensional ◽  
Wet Etching ◽  
Temperature Gradients ◽  
Complex Pattern ◽  
Deep Trench ◽  
Trench Structure ◽  
Novel Method ◽  
Lateral Temperature

A three-dimensional pattern is helpful to improve the temperature variation rates in pyroelectric elements, using lateral temperature gradients induced on the sidewalls of the responsive elements. Creating a complex pattern with a deep trench structure for fitting various discharges of waste heat was imperative, and hard to fabricate, using the traditional methods of dry/wet etching and a dicing saw. A novel method using sandblast etching was successful in fabricating the complex pattern of the vortex-like electrode for improving the electrical output and enhancing the efficiency of the PZT pyroelectric harvesting converters.

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