COMPUTATIONAL SIMULATION ON EMISSIONS OF HYDROGEN FUELED COMPRESSION IGNITION ENGINE WITH VARIABLE COMBUSTION TEMPERATURE

ABSTRACT In this paper, computational simulation on the effect of combustion temperature on emissions characteristics of hydrogen-fuelled compression ignition engine was performed. Combustion process was modeled based on Equilibrium Constant Method (ECM) and programmed using MATLAB program in order to calculate mole fractions of 18 combustion products when hydrogendiesel fuels blends is burnt at variable combustion temperatures. It is observed that throughout all equivalence ratios, higher temperature increases H 2 , CO , HCN, atoms C, O and H, NO, OH, NO 2 and O 3 emissions and decreases CO 2 , H 2 O, NH3 and CH 4 , N 2 , O 2 and HNO 3 emissions. The highest H 2 O emission occurs during stoichiometric combustion and decrease in combustion temperature causes insignificant changes in atom N emission

Characteristics of Vacuum Freeze Drying with Utilization of Internal Cooling and Condenser Waste Heat for Sublimation

Vacuum freeze drying is an excellent drying method, but it is very energy-intensive because a relatively long drying time is required. This research investigates the utilization of condenser waste heat for sublimation as a way of accelerating the drying rate. In addition, it also investigates the effect of internal cooling combined with vacuum cooling in the pressure reduction process. Jelly fish tentacles were used as the specimen, with different configurations for condenser heat waste and internal cooling valve opening. The results show that heating with condenser heat waste can accelerate the drying rate up to 0.0035 kg/m2.s. In addition, pre-freezing by internal cooling prevents evaporation until the mass of the specimen is 0.47 g and promotes transition of the specimen into the solid phase

A Model of Technology Transfer in Japan's Rapid Economic Growth Period

Why did the Japanese economy stagnate before World War II, how did it achieve rapid economic growth after the war, and why did it stagnate again after the 1970s? To answer these questions, I developed a two-country trade model with technology transfer, where firms in a developed country (the U.S.) transfer technology to the competitors in a developing country (Japan) if it is profitable to do so and where the technology transfer is the engine of economic growth. In this model, among multiple equilibria, the equilibrium with low labor cost in Japan was chosen during the rapid growth period. Then, the firms in the developed country transferred technology to the firms in the developing country, resulting in rapid growth. However, during the other periods, the equilibrium with high labor cost in Japan was chosen, which caused stagnation. The model is quantitatively consistent with the per capita GDP relative to the U.S., the purchasing power parity-exchange rate ratio, and to some degree, the swings in labor share of postwar Japan

Energy for Sustainable Future

Energy and the environment are interrelated, and they are critical factors that influence the development of societies [...

A review on energy scenario and sustainable energy in Indonesia

The global energy consumption is likely to grow faster than the population growth. The fuel consumption was growing from 6630 million tons of oil equivalents (Mtoe) in 1980 to 11,163 Mtoe in 2009. This projected consumption will increase 1.5% per year until 2030 and reach 16,900 Mtoe and the main drivers of this growth are mostly developing countries in Asia. Indonesia is one of the developing countries and energy supply is an important factor for all-around development. The country's energy consumption still depends on non-renewable energy such as crude oil, coal and natural gas as sources of energy. Utilization of fossil fuel continuously contributes to huge amount of greenhouse gases emission that leads to climate change. Facing such an unfavorable situation, the government of Indonesia prioritizes on energy supply securities by diversification of energy resources. The energy mixes in Indonesia based on five main resources; these are crude oil, natural gas, coal, hydropower, and renewable energy. Although the country encourages utilizing renewable energy, the contribution is only around 3%. Considering natural condition and geography, this country is blessed with great potential of renewable energy such as solar energy, wind energy, micro hydro and biomass energy. Noting the potential of renewable and sustainable energy resources in the country, the government must pay more attention on how to utilize it. Many efforts have been done to promote renewable energy such as to create energy policy and regulations, yet it still did not give any satisfactory result. Government, non-government agencies and the public should take a more proactive step to promote and use renewable energy in order to achieve the secure and environmentally sustainable energy resources

Techno-Economic Analysis of Hybrid Diesel Generators and Renewable Energy for a Remote Island in the Indian Ocean Using HOMER Pro

This study is about the electrification of the remote islands in the Indian Ocean that were severely affected by the tsunami in the 2004 earth earthquake. To supply electricity to the islands, two diesel generators with capacities of 110 kW and 60 kW were installed in 2019. The feasibility of using renewable energy to supplement or replace the units in these two generators is investigated in this work. In 2019, two diesel generators with capacities of 110 kW and 60 kW were installed in the islands to supply electricity. This work analyses whether the viability of using renewable energy can be used to supplement or replace these two generators. Among the renewable energy options proposed here are a 100 kW wind turbine, solar PV, a converter, and batteries. As a result, the study’s goal is to perform a techno-economic analysis and optimise the proposed hybrid diesel and renewable energy system for a remote island in the Indian Ocean. The Hybrid Optimisation Model for Electric Renewable (HOMER) Pro software was used for all simulations and optimisation for this analysis. The calculation is based on the current diesel price of USD 0.90 per litre (without subsidy). The study found that renewable alone can contribute to 29.2% of renewable energy fractions based on the most optimised systems. The Net Present Cost (NPC) decreased from USD 1.65 million to USD 1.39 million, and the levelised Cost of Energy (CoE) decreased from 0.292 USD/kWh to 0.246 USD/kWh, respectively. The optimised system’s Internal Rate of Return (IRR) is 14% and Return on Investment (ROI) 10%, with a simple payback period of 6.7 years. This study shows that it would be technically feasible to introduce renewable energy on a remote island in Indonesia, where numerous islands have no access to electricity

Techno-Economic Analysis of Hybrid Diesel Generators and Renewable Energy for a Remote Island in the Indian Ocean Using HOMER Pro

This study is about the electrification of the remote islands in the Indian Ocean that were severely affected by the tsunami in the 2004 earth earthquake. To supply electricity to the islands, two diesel generators with capacities of 110 kW and 60 kW were installed in 2019. The feasibility of using renewable energy to supplement or replace the units in these two generators is investigated in this work. In 2019, two diesel generators with capacities of 110 kW and 60 kW were installed in the islands to supply electricity. This work analyses whether the viability of using renewable energy can be used to supplement or replace these two generators. Among the renewable energy options proposed here are a 100 kW wind turbine, solar PV, a converter, and batteries. As a result, the study’s goal is to perform a techno-economic analysis and optimise the proposed hybrid diesel and renewable energy system for a remote island in the Indian Ocean. The Hybrid Optimisation Model for Electric Renewable (HOMER) Pro software was used for all simulations and optimisation for this analysis. The calculation is based on the current diesel price of USD 0.90 per litre (without subsidy). The study found that renewable alone can contribute to 29.2% of renewable energy fractions based on the most optimised systems. The Net Present Cost (NPC) decreased from USD 1.65 million to USD 1.39 million, and the levelised Cost of Energy (CoE) decreased from 0.292 USD/kWh to 0.246 USD/kWh, respectively. The optimised system’s Internal Rate of Return (IRR) is 14% and Return on Investment (ROI) 10%, with a simple payback period of 6.7 years. This study shows that it would be technically feasible to introduce renewable energy on a remote island in Indonesia, where numerous islands have no access to electricity

Review on fuel economy standard and label for vehicle in selected ASEAN countries

Sustainable supply of energy at affordable prices is vital to ensure the human development. ASEAN is committed pursuing for a clean and green region with fully established mechanisms for sustainable development to ensure the protection of regional environment, resources and the high quality of people's life. Nowadays, energy use in the transportation sector represents an important issue in ASEAN countries. Therefore, it is believed that the introduction of fuel economy standards and labels is the key to save energy in this sector. Fuel economy standards and labels are relatively cheap measure to influence consumer behaviour and to induce car manufacturers to produce more efficient vehicles. Fuel economy standards and labels for vehicle are being implemented in many countries around the world to save fuel consumption and mitigate CO2 emission. This paper is a review on fuel economy standard and labels for vehicle in some selected ASEAN countries such as Singapore, Indonesia, Malaysia, Philippines, Thailand and Vietnam. It has been found that Singapore is the leading country in ASEAN that has implemented fuel economy standards and labels. Moreover, it has been found that the implementation of cleaner fuels standard play a crucial role in protecting public health and the environment from transportation sector emissions. The most common alternative fuels used in ASEAN are biodiesel, ethanol, methanol, propane, hydrogen and natural gas. (C) 2011 Elsevier Ltd. All rights reserved.Sustainable supply of energy at affordable prices is vital to ensure the human development. ASEAN is committed pursuing for a clean and green region with fully established mechanisms for sustainable development to ensure the protection of regional environment, resources and the high quality of people&#39;s life. Nowadays, energy use in the transportation sector represents an important issue in ASEAN countries. Therefore, it is believed that the introduction of fuel economy standards and labels is the key to save energy in this sector. Fuel economy standards and labels are relatively cheap measure to influence consumer behaviour and to induce car manufacturers to produce more efficient vehicles. Fuel economy standards and labels for vehicle are being implemented in many countries around the world to save fuel consumption and mitigate CO2 emission. This paper is a review on fuel economy standard and labels for vehicle in some selected ASEAN countries such as Singapore, Indonesia, Malaysia, Philippines, Thailand and Vietnam. It has been found that Singapore is the leading country in ASEAN that has implemented fuel economy standards and labels. Moreover, it has been found that the implementation of cleaner fuels standard play a crucial role in protecting public health and the environment from transportation sector emissions. The most common alternative fuels used in ASEAN are biodiesel, ethanol, methanol, propane, hydrogen and natural gas.</p