In the present scenario importance of an energy conservation increased day by day. There are various utilities in industries in practice like Chillers, Cooling Towers, Blowers, Fans, Motors, Furnaces, Pumps and Air Compressors in manufacturing industries plays vial role in energy consumption. Energy savings is possible increasing either the efficiency or replacement by efficient utility. It has been found that among all the utilities, Air Compressors are the least efficient utilities. It has been observed that compressed air system installed in early stage and due to ageing effect as well as lack of maintenance an efficiency of compressor is dropped down. In proposed work, Performance analysis of four air compressors has been carried out using “pump up test” (PUT) and losses by “leakage test” at different locations has been calculated large scale gear manufacturing industry. Considerable solution in terms of savings has been provided by providing priority base run of air compressors. Additional solution with variable frequency drive has also been also proposed. It has been proved that alternation of both mentioned test able to provide 5-15% additional amount of energy savings.
This comprehensive investigation has been executed to compare the thermodynamic performance and optimization of LiCl–H2O and LiBr–H2O type absorption system integrated with flat-plate collectors (FPC), parabolic-trough collectors (PTC), evacuated-tube collectors (ETC), and compound parabolic collectors (CPC). A model of 10 kW is analyzed in engineering equation solver (ees) from thermodynamic perspectives. Solar collectors are integrated with a storage tank which fueled the LiCl–H2O and LiBr–H2O vapor absorption system to produce refrigeration at 7 °C in evaporator for Gujarat Region of India. The main objective includes the evaluation and optimization of critical performance and design parameters to exhibit the best working fluid pair and collector type. Optimum heat source temperature corresponding to energetic and exergetic aspects for LiCl–H2O pair is lower than that of LiBr–H2O pair for all collectors. Simulation shows that FPC has lowest capital cost, exergetic performance wise PTC is optimum, and ETC requires lowest collector area. On the basis of overall evaluation, solar absorption cooling systems are better to be powered by ETC with LiCl–H2O working fluid pair.
Renewable energies are sustainable and expected to play the significant role for pollution-free energy supply soon. Most traditional renewable energies are solar energy, wind energy, bioenergy, geothermal energy, tidal energy, and hydro-energy. Moreover, solar energy is characterized by their intermittent nature, as it is not available all the time. Another characteristic of these types of energy source is strong fluctuations (on the day), i.e., strong variations of available energy. This intermittent and fluctuation problem can be resolved by energy storage. This paper presents the performance studies on a forced convection solar air heater integrated with the latent-heat type thermal energy storage. The thermal energy storage is designed to maintain 50°C to 55°C temperature during sunshine hours and off sunshine hours especially for food processing. The experimental studies were carried out in the month of summer 2018. The average percentage of the energy recovered is found to be 44 % during the trials. There is a 6°C to 9°C temperature difference between thermal energy storage outlet and ambient air was invariably observed for 6 hours after adequate sunshine hours which is noticeable. Further, the maximum temperature of flat plate type air heater was not increased beyond 70 °C while the maximum outlet temperature from thermal energy storage system was observed 56°C during the entire day during the experiments. It shows no overheating of the system and assures outlet air in the required temperature range for food processing. This system is most useful with the solar dryer which can be used to dry fruits, vegetables, and fishes. This system can also be customized for any particular food item too.
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