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performance Evaluation of Manually Operated Mulch Laying Machine on Different Soil Conditions

NASS Journal of Agricultural Sciences 2023年第1期5卷 8-18页

作者： S.V.pathak A.V.Rangbhal p.u.shahare C.S.Bagde S.S.More Department of Farm Machinery and power Engineering College of Agricultural Engineering and TechnologyDr.Balasaheb Sawant Konkan Krishi VidyapeethDapoliIndia Department of Soil Science College of AgricultureDr.Balasaheb Sawant Konkan Krishi VidyapeethDapoliIndia

A machine with manual operation for mulch-laying machine with a punching arrangement was developed,and its performance was assessed at three different mulch paper thicknesses(15 m,20 m and 25 m),three different disc angles(35 degrees,40 degrees,and 45 degrees),three different punch spacings(250 mm,500 mm,and 1000 mm),and three different forward speeds(1.3 km/h,1.5 km/h,1.7 km/h)to investigate their effects on field capacity,effective field efficiency,and punching *** randomised block design and response surface methods,the experimental plan for optimization was *** of the independent variables’combined effects on the dependent variables were found to be statistically *** influence of operating speed and mulch paper thickness was found to be the most significant on the dependent *** effective field capacity and field efficiency increased from 0.11 ha/h to 0.19 ha/h and 72.04 percent to 89.51 percent,respectively,by increasing mulch paper thickness from 15μm to 25μm and operating speed from 1.3 km/h to 1.7 km/h,whereas punching efficiency fell from 85.18 percent to 84.40 *** paper of 15μm and a disc angle value of 40 degrees were optimised from the independent factors that were chosen for optimal soil covering over the laid plastic mulch *** efficiency was maximised with performance optimised at 500 mm punch ***,the machine operated more efficiently at 1.5 km/h.

关键词： Field efficiency punching efficiency Response surface methodology Mulch laying machine

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Energy Efficient Air Conditioning System using Geothermal Cooling-Solar Heating in Gujarat, India

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Journal of power and Energy Engineering 2016年第1期4卷 57-71页

作者： Sneha shahare T. Harinarayana Gujarat Energy Research and Management Institute PDPU Campus Gandhinagar India School of Technology PDPU Gandhinagar India

It is well known that one unit of electrical energy saved is equal to more than two units produced. One way of economizing the power is utilization of energy efficient systems at all locations. In the present study, the air conditioning system is analysed and an innovative way is suggested. We use natural low temperature of shallow sub surface (1 - 3 m) of the earth—geothermal cooling system. It is known that majority of the households and the apartment complexes in India have two tanks for water storage. One is the underground water sump and the other is the overhead water tank. In our study, we use these two water storage systems for space cooling during summer and also for heating during winter. The main aim of our paper is air-conditioning of the space in an economic way to save electricity. It is based on a simple idea of transferring the low temperature from underground water sump to the room in the house using water as a mode of transport. Since India is a tropical country located at low latitude, most of the year, the air temperature is high and demands space cooling. However, for a couple of months during severe winter months (Dec.-Jan.) at Ahmedabad, heating of the space is required. For heating the space, we suggest to use the well-known solar water heater. Effective use of heat exchanger is shown through computation, modelling schemes and lab experiment. We recommend geothermal cooling for 10 months in a year and solar hot water system during 2 months of winter. It is observed that the ambient air temperature of 35°C - 40°C in the room can be brought down to 26°C without much consumption of electricity. In a similar manner, the room temperature at night (13°C) during winter in Ahmedabad can be increased to 27°C through circulation of water from solar water heater in the heat exchanger.

关键词： Energy Efficiency Geothermal Cooling Air Conditioning CFD Thermal Comfort Earth Water Heat Exchanger

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