Performance Evaluation of Concentrating Solar Cooker Under Indian Climatic Conditions

2008 ◽  
Author(s):  
S. K. Shukla ◽  
S. K. Gupta
Keyword(s):  
Performance Evaluation ◽  
Holistic Health ◽  
Climatic Conditions ◽  
Maximum Temperature ◽  
Modeling And Analysis ◽  
Energy And Exergy ◽  
Indian Climatic ◽  
Low Efficiency ◽  
And Performance ◽  
Experimental Values

The work presented in this paper essentially consists of modeling and analysis of energy and exergy efficiency of a community solar cooker, installed at Holistic Health and Food Centre, I.I.T. Delhi India in March 1998. The cooker is meant for community cooking, which consists of a linear parabolic concentrator with concentration ratio of 20. The experiments, on this cooker, were performed in summer and winter, both the climatic conditions. The measurements were done by using microprocessor based on line data acquisition system using class I solar pyranometer and Pt. 100 temperature sensors. Based on the experimental data obtained by testing and performance evaluation of this concentrating type of solar cooker, the energy and exergy efficiencies are calculated. From an analysis of the experimental values the average efficiency of this cooker is measured as 14% only. The different losses contributes to low efficiency are optical losses (16%), geometrical losses (30%) and thermal losses (35%) accounts for more than, 80% energy waste from the radiation coming to the reflector. The rest of the losses are due to edge losses etc. the maximum temperature of water was recorded 98°C during water heating tests.

scholarly journals Design, Fabrication and Performance Evaluation of a Domestic Gas Oven

2019 ◽  
pp. 1-10
Author(s):  
O. E. Ilesanmi ◽  
B. O. Akinnuli
Keyword(s):  
Performance Evaluation ◽  
Mild Steel ◽  
Heat Dissipation ◽  
Performance Test ◽  
Research Work ◽  
Maximum Temperature ◽  
Temperature Regulator ◽  
Lower Chamber ◽  
And Performance ◽  
Chamber Capacity

This study reports on the design, construction and performance evaluation of a domestic gas oven. The oven was designed and was fabricated with an outer dimension of 860 mm length × 660 mm width × 1150 mm height made up of mild steel and the inner dimension of 759 mm length × 559 mm width × 835 mm height made up of mild steel and fiber glass of 40 mm thickness was used as an insulator to reduce cost to a minimal level. The aim of this research work is to improve on the already existing gas baking oven through the incorporation of a vent/chimney for removal of humid air and roller (wheels) for easy movement. Cooking gas is supplied to the burner located in the lower chamber of the oven via a pipe connection to the gas cylinder. Perforations allow for heat dissipation within the lower chamber. Capacity of the baking oven is 12 loaves of bread of 0.5 kg per bread per tray (batch). Using a temperature regulator and from practical determination, the maximum temperature of 210°C was recorded. The performance test on the oven showed that the efficiency of the oven is of 90.7 percent. The oven can be adapted for both domestic and industrial purposes and have been found very useful in bakery industries. The oven was constructed with locally available materials. Estimated production cost is N56, 470 which is $156.86 at the exchange rate of 360 Naira to a US Dollar as at the time of this design. This can be seen in the Bill of Engineering Measurement and Evaluation (BEME) shown in the report.

Thermodynamic Optimization of Advanced Steam Power Plants Retrofitted for Oxy-Coal Combustion

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
M. V. J. J. Suresh ◽  
K. S. Reddy ◽  
Ajit Kumar Kolar
Keyword(s):  
Energy Efficiency ◽  
Power Plant ◽  
Steam Turbine ◽  
Coal Combustion ◽  
Power Plants ◽  
Climatic Conditions ◽  
Thermodynamic Optimization ◽  
Energy And Exergy ◽  
Indian Climatic ◽  
The Impact

Thermodynamic optimization of power plants based on supercritical (SupC) and ultrasupercritical (USC) steam parameters is reported in this article. The objective is to compute the maximum attainable power plant efficiency in Indian climatic conditions using high ash (HA) indigenous coal. A unit size of 800 MWe presently under development in India is considered for energy and exergy analysis of power plants. Commercially established steam turbine parameters are used for the optimization of SupC power plant, whereas advanced steam turbine parameters currently under research and development are used for the optimization of USC power plant. The plant energy efficiency of the optimized SupC and USC power plant based on air-coal combustion (ACC) show considerable increases of 2.8 and 5.2% points, respectively compared with the current SupC ACC power plant (reference plant) being commissioned in India. The increases in plant exergy efficiency for the same power plants are 2.6 and 4.8% points and the corresponding CO2 reductions are about 6 and 11%, respectively. The maximum possible plant energy efficiency in Indian climatic conditions using HA Indian coal is about 42.7% (USC power plant). The effect of low ash coal on plant energy and exergy efficiencies compared with HA coal is also presented. Further, the effect of oxy-coal combustion (OCC) on the plant energy and exergy efficiencies compared with the ACC is studied for the double reheat SupC and USC power plants to account for the impact of CO2 capture. A significant reduction of 8.8 and 6.6% points in plant energy efficiency is observed for SupC and USC OCC power plants, respectively compared with the reference SupC ACC power plant.

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