Energy and exergy analysis of a solar dryer integrated with sodium sulfate decahydrate and sodium chloride as thermal storage medium

2017 ◽  
Vol 113 ◽  
pp. 1182-1192 ◽  
Author(s):  
M.C. Ndukwu ◽  
L. Bennamoun ◽  
F.I. Abam ◽  
A.B. Eke ◽  
D. Ukoha
Keyword(s):  
Sodium Chloride ◽  
Sodium Sulfate ◽  
Exergy Analysis ◽  
Thermal Storage ◽  
Storage Medium ◽  
Solar Dryer ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis

Energy and exergy analysis of a photovoltaic thermal (PVT) system used in solar dryer: A numerical and experimental investigation

2021 ◽  
Vol 180 ◽  
pp. 410-423
Author(s):  
Erdem Çiftçi ◽  
Ataollah Khanlari ◽  
Adnan Sözen ◽  
İpek Aytaç ◽  
Azim Doğuş Tuncer
Keyword(s):  
Experimental Investigation ◽  
Exergy Analysis ◽  
Solar Dryer ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis

Comparative Study of Various Constant-Pressure Compressed Air Energy Storage Systems Based on Energy and Exergy Analysis

2020 ◽  
Vol 143 (5) ◽  
Author(s):  
Youssef Mazloum ◽  
Haytham Sayah ◽  
Maroun Nemer
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Exergy Analysis ◽  
Constant Pressure ◽  
Storage Systems ◽  
Compressed Air ◽  
Compressed Air Energy Storage ◽  
Storage Medium ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis

Abstract The balance between supply and demand for electricity is mainly disrupted by the growing contribution of renewable energy sources to the electrical grid since these sources are intermittent by nature. Therefore, the energy storage systems, mainly those of considerable size, become essential to restore the electricity balance. The compressed air energy storage (CAES) system is one of the mature technologies used to store electricity on a large scale. Therefore, this article discusses the energy and exergy analysis of different configurations of a constant-pressure CAES system to improve its overall efficiency and energy density. The exergy efficiency of our basic adiabatic configuration using water as thermal storage medium is 56.4% and the energy density is 12.17 kWh/m3. The results show that the CAES system using a packed bed of quartzite rock as thermal storage medium has the best efficiency (67.2%) and energy density (17 kWh/m3) among adiabatic systems. The diabatic CAES systems could have a net efficiency up to 70.1% and an energy density up to 31.95 kWh/m3 by using combustion chambers. Finally, the waste heat recovery from other installations such as a gas turbine power plant has the potential to improve the energy density to 20.53 kWh/m3 without using fossil fuel sources.

Energy and Exergy Analysis on Drying of Banana Using Indirect Type Natural Convection Solar Dryer

2019 ◽  
Vol 41 (6-7) ◽  
pp. 551-561 ◽  
Author(s):  
Abhay Lingayat ◽  
V. P. Chandramohan ◽  
V. R. K. Raju
Keyword(s):  
Natural Convection ◽  
Exergy Analysis ◽  
Solar Dryer ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis

scholarly journals Energy and Exergy Analysis of an Indirect-Mode Natural Convection Solar Dryer for Maize

2021 ◽  
Vol 11 (2) ◽  
pp. 19
Author(s):  
Isaac N. Simate
Keyword(s):  
Natural Convection ◽  
Exergy Analysis ◽  
Exergy Efficiency ◽  
Solar Simulator ◽  
Solar Dryer ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Maize Grain ◽  
Internal Irreversibility ◽  
Drying Chamber

The energy and exergy analysis of an indirect-mode natural convection solar dryer for maize grain is presented. Two different sizes of maize grain bed depths of 0.04 m and 0.02 m translating into grain loads of 10 kg and 5 kg respectively, are used in the study to determine their effects on the collector energy and exergy efficiencies and the drying chamber exergy efficiency. Experiments were carried out using an indirect-mode laboratory solar dryer under a solar simulator with a radiation setting of 634.78 W/m2. The analysis gave average collector energy efficiencies of 33.3 % and 46.2 % for the 10 kg and 5 kg loads, respectively, which are higher than the collector exergy efficiencies of 2.4 % and 2.6 % for the 10 kg and 5 kg loads, respectively. The drying chamber exergy efficiencies are 45.2 % and 28.4 % for the 10 kg and 5 kg loads, respectively. In view of this, the 5 kg load is considered to be more efficient at extracting energy from the collector due to higher air flow resulting from its relatively thin grain bed depth of 0.02 m, but less efficient in utilising the extracted energy to evaporate moisture from the grain which has resulted in a lower drying chamber exergy efficiency. Further, the exergy loss in the drying chamber for the 5 kg load is higher than that in the 10 kg load as 72.3 % of the exergy entering the drying chamber is lost through emissions as well as destroyed through internal irreversibility compared to 57.0 % for the 10 kg load. 

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