scholarly journals Sustainable Campus: Reducing Environmental and Financial Burdens by Using Pruned Branches for On-Campus Energy

2021 ◽  
Vol 13 (13) ◽  
pp. 7480
Author(s):  
Sota Makino ◽  
Takeshi Onishi ◽  
Akika Itoh ◽  
Issei Sato ◽  
Tomohumi Huzita ◽  
...  
Keyword(s):  
Power Generation ◽  
Energy Use ◽  
Ghg Emissions ◽  
Wood Chip ◽  
University Campuses ◽  
Wood Stove ◽  
Japanese University ◽  
Power Generation System ◽  
Financial Burdens ◽  
Campus Energy

Sustainability activities on university campuses are an important part of building a sustainable society. As a part of this effort, the present study quantitatively evaluated the reduction in greenhouse gas (GHG) emissions and disposal costs upon use of pruned branches for on-campus energy use in a Japanese university. The pruned branches are currently used off campus as fuel for biomass power generation, whereas the proposed systems include their on-campus use for heating through wood-chip heaters in a greenhouse or through wood stoves in buildings. The GHG balance was evaluated using a life-cycle assessment, and the cumulative costs over a 20 y period were estimated. Using pruned branches for on-campus heating was 70–180% more effective in reducing GHG emissions than the current off-campus power generation system. Using branches for heating eliminated the emissions produced by the transportation of pruned branches off campus and had higher thermal efficiency than power generation, which was conducive to the replacement of larger quantities of fossil fuel. In addition, the payback period of the proposed systems was estimated at 2 and 4 y for wood stove and wood-chip heater systems, respectively. For the 20 y period, the cumulative costs can be reduced by approximately 20%.

Analysis of Cement Kiln Waste Heat Power Generation System Using the Exergy Analysis Method

2013 ◽  
Vol 860-863 ◽  
pp. 639-644
Author(s):  
Jian Gang Wang ◽  
Pu Yan Zheng ◽  
Zhi Yun Zhou ◽  
Yan Zhou Yuan
Keyword(s):  
Power Generation ◽  
Energy Saving ◽  
Energy Use ◽  
Waste Heat ◽  
Scientific Basis ◽  
Economic Benefits ◽  
Cement Kiln ◽  
Heat Power ◽  
Generation System ◽  
Power Generation System

Power generation using waste heat from cement kiln can not only bring economic benefits to the enterprise, but also play an important role in environment protection. Constantly researches have proved that there is still large energy saving potential in its operation. In this paper, the waste heat power generation system was divided into several subsystems, and the exergy calculation model of each subsystem unit was established. Finally, the weakest part in energy use was found according to the results. It provides a scientific basis for performance improvement and energy saving transformation of waste heat power generation.

scholarly journals The Electrification of Cooking Methods in Korea—Impact on Energy Use and Greenhouse Gas Emissions

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 680 ◽  
Author(s):  
Hyunji Im ◽  
Yunsoung Kim
Keyword(s):  
Power Generation ◽  
Greenhouse Gas ◽  
Energy Demand ◽  
Energy Use ◽  
Ghg Emissions ◽  
Population Increase ◽  
Cooking Methods ◽  
Building Sector ◽  
Housing Complex ◽  
The Impact

The electrification of cooking methods in Korea was investigated to understand the impact of different cooking methods on energy use and greenhouse gas (GHG) emissions in the building sector. Annual household cooking energy consumption was compared for the Nowon Energy Zero House Project, a zero-energy housing complex using induction cooktops, and a sample of households that used natural gas for cooking. The results showed that the former consumed less calories (a difference of 2.2 times) and emitted less GHGs (a difference of 2.6 times) compared to gas cooking households. A countrywide scenario analysis was conducted by combining the share of electric cooking households with the projected power generation mix in 2030. Under the 2030 Policy scenario for power generation, and with an electricity cooking share of 20%, cooking-related GHG emissions were projected to be 3.79 million t CO2/year; 3.8% (150,000 t CO2/year) lower than those in the present day, despite a total population increase. The electrification of cooking methods in Korea has the potential to reduce both the energy demand of the building sector and GHG emissions, in synergy with the decarbonization of the power generation sector.

Analysis of Current Situation and Countermeasure of Solar Energy Photovoltaic Power Generation in Beijing

2012 ◽  
Vol 608-609 ◽  
pp. 46-50
Author(s):  
Xiao Hong Zhang ◽  
Xin Li ◽  
Jin Ping Liang
Keyword(s):  
Power Generation ◽  
Energy Use ◽  
Environmental Problems ◽  
Solar Photovoltaic ◽  
Generation System ◽  
Photovoltaic Power ◽  
The World ◽  
World Economic ◽  
Power Generation System ◽  
Pv Generation

As the world economic development, environmental problems are increasingly serious and renewable energy use by the peoples of common concern. Beijing as the capital of China, is a densely populated city, the increasingly serious environmental problems, the energy consumption also increases, which not only affects people's daily life, but also influence the whole nation's image. The development of solar photovoltaic (PV) generation in Beijing has certain inevitability; its development is mature day after day. But in the course of its development there still exist various problems, therefore, the development of photovoltaic power generation system in Beijing also need further perfect and corresponding support.

Fuel-Cycle Analysis of Fuel Cells for Combined Heat, Hydrogen, and Power Generation

2009 ◽  
Author(s):  
Jeongwoo Han ◽  
Amgad Elgowainy ◽  
Michael Wang
Keyword(s):  
Power Generation ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Hydrogen Production ◽  
Energy Use ◽  
Fuel Cycle ◽  
Ghg Emissions ◽  
Electric Load ◽  
Fuel Cycle Analysis ◽  
Displacement Approach

The fuel-cycle energy use and greenhouse gas (GHG) emissions associated with the application of fuel cells to combined heat and power (CHP) generation and combined heat, hydrogen, and power (CHHP) generation are evaluated and compared with the combustion technologies of internal combustion engines and microturbines, as well as with the various technologies associated with hydrogen production and grid-electricity generation in the United States. Two types of fuel cells are considered in this analysis: a phosphoric acid fuel cell (PAFC) capable of following either heat or electric load and a molten carbonate fuel cell (MCFC) that typically follows the electric load. Three types of facilities (hospital, large office building, and warehouse) are examined in two different climatic regions (Chicago and Los Angeles) to span a wide range of electric-to-heat load ratios. Two different approaches for fuel cycle analysis of CHP and CHHP applications are considered in this analysis: a total demand approach and a displacement approach. The total demand approach provides an accurate assessment of the impact of actual demand on total energy use and GHG emissions, while the displacement approach projects the potential for more energy savings and GHG emissions benefits relative to the supply of electricity from the grid generation mix. The fuel cycle results are primarily impacted by the efficiencies of hydrogen production and electric power generation, as well as by the utility factor of the co-produced heat. The energy use and GHG emissions associated with the electric power generation represent the majority of the fuel-cycle’s total energy use and emissions for all pathways. More energy and GHG emissions benefits are realized from fuel cell technologies with increased use of available coproduced heat. In general, CHHP systems exhibit more energy and GHG emission benefits than CHP systems for any of the investigated fuel cell technologies.

Development of a City Type Compact Wind Power Generation System

2005 ◽  
Vol 125 (11) ◽  
pp. 1016-1021 ◽  
Author(s):  
Yoshihisa Sato ◽  
Naotsugu Yoshida ◽  
Ryuichi Shimada
Keyword(s):  
Power Generation ◽  
Wind Power ◽  
Wind Power Generation ◽  
Generation System ◽  
Power Generation System
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