In this communication, thermal performance of building integrated “Earth Air Tunnel Heat Exchanger” (EATHE) has been studied for a composite climate of Delhi. Mathematical model and building thermal simulation software (Energy Plus) are used for prediction of indoor air temperatures. The predicted results are validated through experimental results. Energy conservation potential both for heating and cooling of EATHE has been evaluated for winter and summer months in a specific year. Quantitative assessment of CO2 mitigation has also been computed. It is observed that Coefficient of performance (COP) of EATHE is found between 6.3–13 during summer and 6.8–9.5 during winter season. The maximum drop in air temperature across the earth air tunnel is found to be 8.7 °C with air velocity of 2.69 m/s during peak summer and during winter season the room air temperature is raised by 5–7 °C. On the other hand, the system is capable of maintaining room temperature in the range of 27–30 °C during peak summer when outdoor temperature are in the range of 33–41 °C. EATHE integration with building can significantly reduce the electrical power consumption by 96.63 MWh annually, needed for space heating and cooling load. It is discovered from the study that this EATHE has potential of reducing global warming 8 by substantially mitigating CO2 to the tune of 95 tonnes annually.
Solar chimneys are with or without heat storage widely used for improving the ventilation and thermal comfort in buildings. The energy, exergy, economic analysis of solar chimney and the CO2 mitigations (EEEC) are evaluated in this communication. The improved solar chimney with MS plate and MS box was designed and developed by the author in the CBRI Roorkee. The observations of typical day of December have been taken for the presentation and the whole month data have been used to evaluate the EEEC parameters. The maximum energy efficiency has been observed by 26.68% during 12 hours of the typical day, and at the same time the exergy efficiency has obtained 3.69%. Approximately 2285kWh energy can be saved during a year through solar chimneys. The payback period of an improved solar chimney with MS plate (SCWMSP) is estimated to be less than one year and with MS box (SCWMSB)) it is likely to be one year. CO2 can also be saved with the energy conservation parameter observed saving of 4.37 ton / year CO2 by SCWMSP, on the other hand if SCWMSB have implemented than CO2 would be save by 5.51 ton/year.
Abstract The thermal load in the wind turbine nacelle is increasing due to the higher dissipation of heat from the various components in the high unit capacity wind mill. With the motive to develop a sustainable and efficient windmill, research on low cost highly efficient wind turbine nacelle cooling systems has become particularly important. In this review, the prominent waste heat producing sources and the extensively used cooling systems are described. A detailed analysis of the advantages and limitations of each system and the use of various cooling fluids as cooling medium in wind turbine nacelle cooling systems is also discussed. Use of nanofluids as cooling medium in liquid cooling system is also highlighted as it produces a higher thermal performance enhancement. Hence, it is identified as a promising option for a cooling medium and future research. This article is categorized under: Wind Power > Systems and Infrastructure Wind Power > Science and Materials Energy Infrastructure > Systems and Infrastructure
In this investigation, methyl ester of Mustard oil was prepared by trans esterification using solid potassium hydro-oxide as catalyst and used in a 3.5kW single cylinder four stroke diesel engine. Tests were performed at different load conditions and the per-formance was analyzed for B5 to B30 blends of Mustard biodiesel and pure mineral diesel. It was concluded that the lower blends of biodiesel enhance the break thermal efficiency and reduce the fuel consumption. It is proved that the use of biodiesel (produced from Mustard oil) in compression ignition engine is a viable substitute to diesel.
Owing to its natural and rich advantages, exploration of solar energy technology has become increasingly popular in recent years to counter the growing crude oil prices. However, its universal adoption is still limited, not only due to environmental restrictions but also due to lower overall efficiency. Rankine cycle is optimised to conduct 4-E (Exergy, Energy, Economic and Ecological) analysis. Furthermore, three sets (R-113, R-11, and R-1233zd) of refrigerants are prioritised and ranked on the basis of 4-E analysis as outcomes. The contemporary study addressed all critical factors and explains the impact of solar irradiance, mass flow rate of molten salt and steam, turbine inlet pressure, and turbine inlet temperature which are eventually weighed and prioritised using combined multi-criteria decision making (MCDM) techniques. The energy efficiency, exergetic efficiency, power/ cost of electricity, and ecological emissions are taken as the indicators of the combined cycle, respectively. The energy efficiency of the hybrid system is improved to 75.07% after including cogeneration cycle, with an increment of 54.58%. In comparison to conventional thermal powerplant setups, the power/cost of electricity and ecological efficiency have been reduced by 68% and upgraded by 16%, correspondingly. Direct normal radiation is the most critical factor followed by turbine inlet temperature. Further, the result indicates that maximum exergy destruction that occurs in the central receiver declines to 39.92%, followed by heliostat and steam turbine which was 27% and 9.32% respectively. In conclusion, the hybrid cycle can furnish cheaper electricity, with lower carbon imprint in sustainable manner with better efficiency.
The utilization of solar energy to generate the off-grid electric power is a prominent technology which is utilized in photovoltaic based water pumping system for agriculture and community water supply in this stud. It helps to improve the agricultural productivity which improves the living standard of a farmer and also reduces the CO2 emissions by replacing fossil fuels. This technology replaces 100% fossil fuel system and save CO2 by 14977.57 kg/year. This paper presents fuel replacement and reduction of carbon dioxide on an annual basis and economic analysis of photovoltaic based water pumping system.
Efficient use of fuel and reliable operation of the combined cycle power plant is a function of skilled man power and proper mix of maintenance strategies. The objective of maximum utilization of resources can’t be met without apt planning at management level. Evaluation impact of policies decided by the management on the performance of the labour is to be evaluated constantly so that pros and cons may be studied and epitomized for the future. In comparison to other organizations electricity generation industry effects more today’s dynamic market more in terms of production. Market conditions are affected by shortened electricity supply, poor transmission system, technological advancements and intense pressure from competitors and high quality and low cost expectations from customers. In the present work analysis of a gas turbine based power plant is presented which can be used for the improvement in the system.
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