Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Exergy losses


Experimental Exergetic And Energetic Analysis of Different (PV) Array Configurations

Dalya A. Omer; Mahmoud M. Mahdi; Ahlam L. Shuraiji

Engineering and Technology Journal, 2022, Volume 40, Issue 1, Pages 82-89
DOI: 10.30684/etj.v40i1.2052

It is well known that photovoltaic (PV) can be connected in parallel, series, and parallel series. In this study, four PV panels are connected in four different ways, i.e., 4panels parallel (4p), 3panels parallel*1panel series (3p*1s), 2panels parallel*2panels parallel (2p*2p) connected in series, and 2panels series *2panels series (2s*2s) connected in parallel, to determine the best PV panels configuration for supplying DC power to the Variable Speed Compressor (VSC) with the highest average exergy efficiency and minimum exergy losses under sunny daylight hours. Experimental data is used to calculate the exergy efficiency of the mentioned configurations. The best results are delivered by (2p*2p) configuration with average exergy efficiency of 43.77% and exergy efficiency of 88.05%. Whereas the percentage of improvement for the average exergy efficiency of this configuration compared with the (2s*2s), (4p), and (3p*1s) are (55.93%), (63.69%) and (78.9%) respectively.

Exergy Losses Calculation for a 125 MW Combined Power Plant

Falah F. Hatem

Engineering and Technology Journal, 2009, Volume 27, Issue 2, Pages 386-394

Theoretical exergy analysis is carried out for different components of a
combined power plant which consists of a gas turbine unit, waste heat recovery
boiler without extra fuel consumption and steam turbine unit. The results
pinpoint that more exergy losses occurred in the gas turbine combustion
chamber. Its reached 33% of the consumed fuel exergy while the exergy losses
in other plant components are between 1% - 5% of the consumed fuel exergy
.This paper also considered the effect of the pressure ratio, maximum
temperature, boiler pressure and ambient temperature on the exergy losses in the
plant, there are a clear effects in the exergy losses when changing pressure ratio,
maximum temperature and boiler pressure.