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Mathematical modelling of a steam boiler room to research thermal efficiency

Bujak, J. - In: Energy 33 (2008) 12, pp. 1779-1787

This paper introduces a mathematical model of a boiler room to research its thermal efficiency. The model is regarded as an open thermodynamic system exchanging mass, energy, and heat with the atmosphere. On those grounds, the energy and energy balance were calculated. Here I show several...

Persistent link: https://www.econbiz.de/10011053797

Energy, Exergy and Performance Analysis of Small-Scale Organic Rankine Cycle Systems for Electrical Power Generation Applicable in Rural Areas of Developing Countries

Baral, Suresh; Kim, Dokyun; Yun, Eunkoo; Kim, Kyung Chun - In: Energies 8 (2015) 2, pp. 684-713

electricity in remote areas of developing countries. The Organic Rankine Cycle Systems (ORC) system uses a commercial magnetically …-coupled scroll expander, plate type heat exchangers and plunger type working fluid feed pump. The heat source for the ORC system can … 1.4 kW. In addition, the system cost analysis and financing mechanisms for the installation of the ORC system were …

Persistent link: https://www.econbiz.de/10011124434

Experimental study of cooling BIPV modules by forced convection in the air channel

Kaiser, A.S.; Zamora, B.; Mazón, R.; García, J.R.; … - In: Applied Energy 135 (2014) C, pp. 88-97

The efficiency of photovoltaic systems depends mainly on the cell temperature. Frequently, the PV collectors are installed on the top of the building. One cost effective method to regulate the temperature of rooftop integrated photovoltaic panels is to provide an open air channel beneath the...

Persistent link: https://www.econbiz.de/10011076377

Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions

Fu, Ben-Ran; Hsu, Sung-Wei; Lee, Yuh-Ren; Hsieh, Jui-Ching - In: Energies 7 (2014) 6, pp. 3684-3694

An organic Rankine cycle system comprised of a preheater, evaporator, condenser, turbine, generator, and pump was used to study its off-design performance and the operational control strategy. R245fa was used as the working fluid. Under the design conditions, the net power output is 243 kW and...

Persistent link: https://www.econbiz.de/10011030848

Energy Subsidies in Argentina Lead to Inequalities and Low Thermal Efficiency

González, Alejandro D. - In: Energies 2 (2009) 3, pp. 769-788

Natural gas is the main energy resource for buildings in Argentina. Since 2002, subsidies have kept the prices of this fuel between 9 and 26 times lower than regular prices in other countries. The lowest prices are the result of climate-related subsidies. In cold areas, heating uses several...

Persistent link: https://www.econbiz.de/10011031169

Comparative Experimental Analysis of the Thermal Performance of Evacuated Tube Solar Water Heater Systems With and Without a Mini-Compound Parabolic Concentrating (CPC) Reflector(<...

Pei, Gang; Li, Guiqiang; Zhou, Xi; Ji, Jie; Su, Yuehong - In: Energies 5 (2012) 4, pp. 911-924

Evacuated tube solar water heater systems are widely used in China due to their high thermal efficiency, simple construction requirements, and low manufacturing costs. CPC evacuated tube solar water heaters with a geometrical concentration ratio <em>C</em> of less than one are rare. A comparison of the...

Persistent link: https://www.econbiz.de/10011031228

Cost-benefit assessment of energy efficiency investments: Accounting for future resources, savings and risks in the Australian residential sector

Morrissey, J.; Meyrick, B.; Sivaraman, D.; Horne, R.E.; … - In: Energy Policy 54 (2013) C, pp. 148-159

This article focuses on the impact of the discount rate on cost-benefit assessment of investment options for residential building efficiency. An integrated thermal modeling, life cycle costing approach is applied to an extensive sample of dominant house designs for Australian conditions. The...

Persistent link: https://www.econbiz.de/10010617008

Finite time thermodynamic evaluation of endoreversible Stirling heat engine at maximum power conditions

Tlili, Iskander - In: Renewable and Sustainable Energy Reviews 16 (2012) 4, pp. 2234-2241

Maximum power and efficiency at the maximum power point of an endoreversible Stirling heat engine with finite heat capacitance rate of external fluids in the heat source/sink reservoirs with regenerative losses are treated. It was found that the thermal efficiency depends on the regenerator...

Persistent link: https://www.econbiz.de/10010573431

A review on solar stills for brine desalination

Xiao, Gang; Wang, Xihui; Ni, Mingjiang; Wang, Fei; Zhu, … - In: Applied Energy 103 (2013) C, pp. 642-652

This paper attempts to categorize solar stills into six sorts based on the design guidelines used in each device. The properties of these design guidelines are detailed and evaluated from the angle of enhancing the productivity of solar stills. Preferred design guidelines are recommended for...

Persistent link: https://www.econbiz.de/10010602997

Energy efficiency improvement and fuel savings in water heaters using baffles

Moeini Sedeh, Mahmoud; Khodadadi, J.M. - In: Applied Energy 102 (2013) C, pp. 520-533

Thermal efficiency improvement of a water heater was investigated numerically and experimentally in response to presence of a baffle, particularly designed for modifying the flow field within the water reservoir and enhancing heat transfer extracted into the water tank. A residential natural...

Persistent link: https://www.econbiz.de/10010603034