Muerte e inmortalidad en el Rig Veda y en el Atharva Veda

Ningun

Strategi Pemenuhan Kebutuhan Hidup Single Parent

Strategi Pemenuhan Kebutuhan Hidup Single Parent Masyarakat Lilirilau Kabupaten Soppeng. Rumusan masalah dari penelitian ini adalah bagaimana strategisingle parent dalam memenuhi kebutuhan hidup di lilirilau kabupaten soppeng dan apakah masalah yang dihadapi olehsingle parent dalam memenuhi kebutuhan hidup di lilirilau kabupaten soppeng Penelitian ini bertujuan untuk mengetahui strategisingle parent dalam memenuhi kebutuhan hidup di lilirilau kabupaten soppeng dan untuk mengetahui masalah yang dihadapi olehsingle parent dalam memenuhi kebutuhan hidup di lilirilau kabupaten soppeng. Jenis penelitian ini adalah metode kualitatif deskriptif, pengumpulan data digunakan dengan cara observasi, wawancara mendalam, dan dokumentasi. Dalam penelitian ini, yang menjadi sasaran penelitian adalah pertama keluarga single parent di kecamatan lilirilau kabupaten soppeng, kedua masyarakat yang dianggap bisa memberikan informasi atau data yang sesuai dengan penelitian. Hasil penelitian ini menunjukkan bahwa, suatu strategi yang di lakukan oleh single parent untuk memenuhi kebutuhan hidupnya yaitu dengan melakukan kerja sampingan selain itu cara yang dilakukan dengan mengambil pinjaman kepada tetangga. Berdasarkan hasil penelitian tentang strategi pemenuhan kebutuhan hidup maka single parent di tuntut untuk bekerja keras untuk menafkahi keluarganya

Elementos arcaicos en tres concepciones de atman (alma) de la brihad-aranyaka-upanishad

Ningun

Modelling and performance analysis of a Low Temperature A-CAES system coupled with renewable energy power plants

The ever-increasing electricity production from non-programmable Renewable Energy Sources (RES) requires flexible and sustainable solutions for energy storage. In this paper, the design, and the performance of a Low Temperature Adiabatic Compressed Air Energy Storage (LTA-CAES) system are presented. The design of this system is optimised to better utilise the energy produced by either a photovoltaic (PV) power plant and an onshore wind farm in order to meet the energy demand of a small town of about 10,000 inhabitants, considered as the case study. To ensure efficient operation of the turbomachines, the mass flow rate during both the charge and discharge phases was fixed, allowing most of the compressors and turbines to operate at design conditions. Two packed-bed Thermal Energy Storage (TES) systems are used to store the thermal energy produced during the compression phase: the first exchanges heat directly with the compressed air, while the second uses Therminol-66 as a heat transfer fluid. A mathematical model of the LTA-CAES system was developed using MATLAB/Simulink to simulate its performance, considering the off-design behaviour of the turbomachines and the TES systems over a year. The results demonstrate that the LTA-CAES system increases the share of the yearly energy demand covered by renewable energy, from 41.8% to 60.7% when coupled with the PV plant, and from 48.0% to 56.5% when coupled with the wind farm

Performance Assessment of Low-Temperature A-CAES (Adiabatic Compressed Air Energy Storage) Plants

The widespread diffusion of renewable energy sources calls for the development of high-capacity energy storage systems as the A-CAES (Adiabatic Compressed Air Energy Storage) systems. In this framework, low temperature (100°C–200°C) A-CAES (LT-ACAES) systems can assume a key role, avoiding some critical issues connected to the operation of high temperature ones. In this paper, two different LT-ACAES configurations are proposed. The two configurations are characterized by the same turbomachines and compressed air storage section, while differ in the TES section and its integration with the turbomachinery. In particular, the first configuration includes two separated cycles: the working fluid (air) cycle and the heat transfer fluid (HTF) cycle. Several heat exchangers connect the two cycles allowing to recover thermal energy from the compressors and to heat the compressed air at the turbine inlet. Two different HTFs were considered: air (case A) and thermal oil (case B). The second configuration is composed of only one cycle, where the operating fluid and the HTF are the same (air) and the TES section is composed of three different packed-bed thermal storage tanks (case C). The tanks directly recover the heat from the compressors and heat the air at each turbine inlet, avoiding the use of heat exchangers. The LT-ACAES systems were modelled and simulated using the ASPEN-Plus and the MATLAB-Simulink environments. The main aim of this study was the detailed analysis of the reciprocal influence between the turbomachinery and the TES system; furthermore, the performance evaluation of each plant was carried out assuming both on-design and off-design operating conditions. Finally, the different configurations were compared through the main performance parameters, such as the round-trip efficiency. A total power output of around 10 MW was set, leading to a TES tank volume ranging between 500 and 700 m3. The second configuration with three TES systems appears to be the most promising in terms of round-trip efficiency since the energy produced during the discharging phase is greater. In particular, the round-trip efficiency of the LT-ACAES ranges between 0.566 (case A) to 0.674 (case C). Although the second configuration assures the highest performance, the effect of operating at very high pressures inside the tanks should be carefully evaluated in terms of overall costs