International Journal of Energy Science
[1 followers] Follow
Open Access journal
ISSN (Print) 2218-6026 - ISSN (Online) 2304-3679
Published by Science and Engineering Publishing Company [49 journals]
- Thermodynamic and Environmental Analysis of Low-Grade Waste Heat Recovery
System for a Ship Power Plant
Abstract: Thermodynamic and Environmental Analysis of Low-Grade Waste Heat Recovery System for a Ship Power Plant
Author Cengiz Deni
Shipping is a growing sector in the global economy and its contributions to global greenhouse gas (GHG) emissions are expected to increase. Energy efficiency has always been an important factor to minimize GHG emissions. Waste heat recovery (WHR) systems can be used for both improving energy efficiency and reducing energy consumption and GHG emissions. Organic Rankine Cycles (ORC) systems are the most widely used technology for low temperature heat recovery from exhaust gases in the industrial applications. But this system is not widely used in ship applications. In this study thermodynamic performance criteria of ORC system for a container ship are developed and thermodynamic, environmental and economic effects of the system are analyzed. It can be achieved additionally 2% reduction for the ship fuel consumption by utilizing the ORC system.
- Acceleration of Biogas Production in Cattle Dung Digestion through
Jatropha Curcas Oil Cake as an Additive
Abstract: Acceleration of Biogas Production in Cattle Dung Digestion through Jatropha Curcas Oil Cake as an Additive
Author Sanjay L. PalAtul P. VanerkarShanta Satyanaraya
World is facing acute energy crisis. Attention is being directed towards other unconventional sources of energy. Recently more attempts are being made to produce biodiesel as an alternative source of ecofriendly energy using biomass of plant origin. One such biomass is Jatropha curcas. But during biodiesel production from 100 kgs of Jatropha seed only 30% of oil is extracted while 70% of de-oiled cake is generated as a byproduct. Based on this fact work on enhancement of biogas by Jatropha amendment was studies in detail and studies showed that 20% amendment of Jatropha oil cake seems optimum with respect to gas production and volatile solids reduction. It is preferable to run the digester with optimal addition because addition of higher volume of Jatropha may pose a problem and may be rate limiting factor.
- Waste Heat Recovery Study of Spiral Flow Heat Exchanger Used in Hybrid
Solar System with Reflectors
Abstract: Waste Heat Recovery Study of Spiral Flow Heat Exchanger Used in Hybrid Solar System with Reflectors
Author V. N. Palaskar PalaskarS. P. Deshmuk
The combined efficiency of simple hybrid photovoltaic/thermal (PV/T) solar water system is less due to its low concentration ratios and, non-standardization of PV heat exchanger surfaces. The simple and cost effective technique to increase PV/T efficiency is the use of reflectors which will boost solar radiation on PV module surface. Flat reflectors fitted to sides of PV module of hybrid system helps in improving the concentration of solar radiation on it. This paper provides design and performance analysis of spiral flow heat exchanger used in hybrid system with flat reflectors of aluminum sheets. The experimental results like performance efficiencies of photovoltaic, thermal, and combined photovoltaic/thermal system over a range of actual working conditions are discussed and evaluated for latitude of Mumbai. The results at solar radiation of 950 W/m2 and water mass flow rate of 0.042 kg/sec through heat exchanger with reflectors showed combined PV/T efficiency of 71.40 % with PV efficiency of 12.40%.
- Energy Consumption and Economic Growth: A Panel Data Aproach to OECD
Abstract: Energy Consumption and Economic Growth: A Panel Data Aproach to OECD Countries
Author Cem IşıkMuhammad Shahba
This paper purposes to examine the relationship between energy consumption and economic growth in OECD countries during the period of 1980–2010. The panel data methods are used to analyse the causal relationship between energy and growth. It is important to see observe the ways of causality between energy consumption and economic growth for the policy-makers. The research outcomes reveal that there is significant correlation between energy consumption and economic growth in OECD countries.