Assmelash Negash

Korea Institute of Machinery and Materials | KIMM · Department of Environmental and Energy Systems

Fossil fuel power plants can cause numerous environmental issues, owing to exhaust emissions and substantial water consumption. In a thermal power plant, heat and water recovery from flue gas can reduce CO2 emissions and water demand. High-humidity flue gas averts the diffusion of pollutants, enhances the secondary transformation of air pollutants,...

Fossil fuel power plants can cause many environmental problems owing to exhaust emissions and significant amounts of water consumption. Heat and water recovery from the flue gas in a thermal power plant can reduce CO2 emissions and water demands. Water recovery can also reduce the incidence of white plumes and smog around the power plant because th...

In this study, thirty of customized bismuth-telluride (Bi2Te3) thermoelectric modules (TEMs) were fabricated for waste heat recovery of a diesel engine using a thermoelectric generator (TEG). By installing a plate-type porous medium whose porosity ranges from 0.121 to 0.516 in the TEG, the effects of the porosity on energy harvesting performance we...

Fossil-fueled power plants present a problem of significant water consumption, carbon dioxide emissions, and environmental pollution. Several techniques have been developed to utilize flue gas, which can help solve these problems. Among these, the ones focusing on energy extraction beyond the dew point of the moisture present within the flue gas ar...

This paper proposes the concept of a direct contact thermoelectric generator (DCTEG) to enhance the practicality and widen the application areas of thermoelectric generators (TEGs). In the DCTEG, one thermoelectric module (TEM) surface is directly exposed to a heat source, and the other surface is in direct contact with a coolant flow. The current...

In this study, waste heat recovery performance of a direct contact thermoelectric generator (DCTEG) is experimentally investigated on a diesel engine. In order to conduct an insightful analysis of the DCTEG characteristics, three experimental parameters—engine load, rotation speed, and coolant temperature—are chosen to vary over ranges during the e...

This study was devoted to investigating the energy utilization of a thermoelectric generator (TEG). Key factors governing the power generation characteristics of the TEG—the power output, system resistance, and conversion efficiency—are systematically analyzed under various engine operating conditions. The effects of heat rejection conditions on th...

An experimental study was undertaken to investigate the effect of the electrical array configuration of thermoelectric modules (TEMs) on thermoelectric power generation. A thermoelectric generator (TEG) was constructed with customized TEMs. Prior to the system-wise power generation experiment, the electrical characteristics of each TEM (a total of...

The waste heat recovery performance of a thermoelectric generator (TEG) was experimentally investigated. Forty customized thermoelectric modules (TEMs) were installed on the upper and lower sides of a rectangular exhaust gas channel in a 4 × 5 arrangement. Water at an ambient temperature of ∼293 K was supplied from a cooling tower and was used to c...