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Biomass energy cost and feasibility of gasifier based biomass power generation system

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International Journal of Agricultural and Biological Engineering 2013年第4期6卷 55-63页

作者： Khambalkar V P Kankal U S Karale D S Gangde C N Department of Farm Power and Machinery College of Agricultural Engineering and Technology and Dr.Panjabrao Deshmukh Agricultural UniversityAkola MS 444104India

The present research work has been carried out on biomass based on 10 kW capacity gasifier power generation system installed at College of Agricultural Engineering and Technology,*** Deshmukh Agricultural University(***),Akola Maharashtra,*** main objectives were to evaluate various costs and benefits involved in the power generation *** costs of energy per unit were calculated for the first year of *** economics of gasifier based power generation system and thereby the feasibility of the system was examined by estimating per unit cost,Net Present Value(NPV),Benefit Cost Ratio(BCR),Internal Rate of Return(IRR)and payback *** discount cash flow method was used to find out the *** the present analysis,three costs viz.,installed capital cost,operation and maintenance cost,and levelised replacement cost were examined for the evaluation of the power generation per *** rate on investment in case of subsidy(Case I)and in case without subsidy(Case II)for installation cost of system was considered as 12.75%.The BCR comes in Case I for operating duration of 22 h,20 h,and 16 h are 1.24,1.18,and 1.13,*** for Case II BCR comes 1.44,1.38,and *** IRR comes in Case I for operating duration of 22 h,20 h,and 16 h are 26%,22%,and 19%,*** for Case II,IRR comes 52%,44%,and 39%for operating duration of 22 h,20 h,and 16 h,*** payback period in the present analysis was worked *** payback period for biomass based gasifier power generation system was observed to be for Case I from three to four years and for Case II it was one to two years.

关键词： cost of biomass energy biomass power generation system discounted cash flow benefit cost ratio net present value payback period internal rate of return

Optimum insulation thickness for the sandwich structure livestock buildings external envelopes in different climate regions of China

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International Journal of Agricultural and Biological Engineering 2020年第1期13卷 29-41页

作者： Yang Wang Baoming Li Weichao Zheng College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083China Key Laboratory of Agricultural Engineering in Structure and Environment Ministry of Agriculture and Rural AffairsBeijing 100083China Beijing Engineering Research Center for Animal Healthy Environment Beijing 100083China

Determining the optimum insulation thicknesses of external envelopes for livestock buildings are one of the most effective metrics to decrease energy *** study was carried out to determine the optimum insulation thicknesses for livestock buildings in different climate zones,to examine the effects of insulation thickness and material(foam glass,mineral wool,expanded polystyrene,foamed polyurethane,foamed polyvinyl chloride,and expanded polyethylene)on life cycle total cost,life cycle savings,and payback *** finishing pig houses and laying hen buildings with sandwich wall structures(color steel laminboard)in five typical cities were studied using the degree-days method with economic *** insulation thicknesses ranged from 0.05 m to 0.25 m and 0.02 m to 0.24 m in finishing pig houses and poultry buildings,respectively;the life cycle total costs ranged from 16.49 to 37.98$/m2 and 13.37 to 36.84$/m2;the life cycle savings ranged from 29.13 to 220.60$/m2 and 0 to 202.13$/m2;and the payback period ranged from 1.11 to 5.81 years and 1.19 to 20.76 years,*** polyurethane provided the highest life cycle savings,while foam glass had the *** this research,the insulation thicknesses for the sandwich structure livestock buildings external envelopes are optimized,and the energy saving can be obtained by using proper insulation thickness in different ***,it can increase the knowledge about energy consumption in the livestock buildings and the results can be also a useful tool for farmers.

关键词： livestock building insulation material optimum insulation thicknesses degree-days life cycle total cost life cycle saving payback period

Optimal Thermal Insulation Thickness in Isolated Air-Conditioned Buildings and Economic Analysis

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Journal of Electronics Cooling and Thermal Control 2020年第2期9卷 23-45页

作者： Mousa M. Mohamed Department of Mechanical Power Engineering Faculty of Engineering Menoufia University Shebin El Kom Egypt

The removal building heat load and electrical power consumption by air conditioning system are proportional to the outside conditions and solar radiation intensity. Building construction materials has substantial effects on the transmission heat through outer walls, ceiling and glazing windows. Good thermal isolation for buildings is important to reduce the transmitted heat and consumed power. The buildings models are constructed from common materials with 0 - 16 cm of thermal insulation thickness in the outer walls and ceilings, and double-layers glazing windows. The building heat loads were calculated for two types of walls and ceiling with and without thermal insulation. The cooling load temperature difference method, CLTD, was used to estimate the building heat load during a 24-hour each day throughout spring, summer, autumn and winter seasons. The annual cooling degree-day, CDD was used to estimate the optimal thermal insulation thickness and payback period with including the solar radiation effect on the outer walls surfaces. The average saved energy percentage in summer, spring, autumn and winter are 35.5%, 32.8%, 33.2% and 30.7% respectively, and average yearly saved energy is about of 33.5%. The optimal thermal insulation thickness was obtained between 7 - 12 cm and payback period of 20 - 30 month for some Egyptian Cities according to the Latitude and annual degree-days.

关键词： Building Heat Load Cooling Load Temperature Difference Energy Saving Power Consumption Annual Cooling Degree-Day Optimal Thermal Insulation Thickness payback period

Energy and Emission Reduction Potential for Bank ATM Units in India

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Open Journal of Energy Efficiency 2016年第4期5卷 107-120页

作者： Hemant Kumar Singh Ravi Prakash Karunesh Kumar Shukla Department of Mechanical Engineering Motilal Nehru National Institute of Technology Allahabad India Department of Applied Mechanics Motilal Nehru National Institute of Technology Allahabad India

With the growing economy of India, banking sector growth has led to installation of thousands of Automatic Teller Machines (ATMs) throughout the country. ATMs provide 24 × 7 services as well as operate at low-temperature ranges of cooling, hence have high operating energy costs. Insulating an ATM’s envelope is not a prevalent technique in India. In the present study, an effort has been made to determine the optimum insulation thickness for three different insulation materials for the typical ATM envelope in four different climatic zones of India. Life cycle savings and payback periods for various insulation materials are also evaluated. Further, these optimally insulated ATM envelopes can be integrated with grid connected rooftop solar PV systems. The energy saving and emissions reduction potential due to these two interventions have been estimated on the national basis. Altogether in the four selected climate zones, energy saving of 17% - 30% provides the annual economic benefit of Indian National Rupees (Rs.) 3570 million with annual carbon reduction potential of about 0.60 million tCO2. From this study, it is observed that properly insulated ATMs integrated with rooftop solar PV systems, can significantly reduce the energy costs as well as carbon emissions in India’s context.

关键词： Life Cycle Cost Optimum Insulation Thickness Life Cycle Saving Solar PV payback period Carbon Emissions

Selection of High Energy Efficiency Central Air Conditioning Units According to Economic Feasibility

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Selection of High Energy Efficiency Central Air Conditioning...