scholarly journals Thermodynamic Analysis and Comparison of Two Small-Scale Solar Electrical Power Generation Systems

2020 ◽  
Vol 12 (24) ◽  
pp. 10268
Author(s):  
Junfen Li ◽  
Hang Guo ◽  
Qingpeng Meng ◽  
Yuting Wu ◽  
Fang Ye ◽  
...  
Keyword(s):  
Power Generation ◽  
Energy Storage ◽  
Polymer Electrolyte ◽  
Environmental Temperature ◽  
Polymer Electrolyte Membrane ◽  
Electrical Power ◽  
Photovoltaic Cell ◽  
Solar Irradiation ◽  
Electrolyte Membrane ◽  
Power Generation System

In this study, two schemes of solar electrical power generation are designed and compared according to solar collection area minimization. The one comprises the parabolic trough collector, dual-tank of molten salt heat storage, and Organic Rankine cycle. The other consists of photovoltaic cell, polymer electrolyte membrane water electrolyzer, and polymer electrolyte membrane fuel cell. The effects of irradiation value, environmental temperature, and energy storage type on thermodynamic performance were investigated. The results indicated that the solar irradiation value had a more obvious effect on the PV (photovoltaic) cell performance than environmental temperature, and the PTC (parabolic trough concentrator) performance was improved with the increases of solar irradiation value and environmental temperature. The environmental temperature effect was negligible; however, the influence of irradiation value was obvious. Irradiation value had a positive effect on the former system, whereas it demonstrated the opposite for the latter. The latter system had much lower efficiency than the former, due to the low conversion efficiency between hydrogen energy and electrical energy in the polymer electrolyte membrane water electrolyzer and fuel cell. Stated thus, the latter system is appropriate for the power generation system with non-energy storage, and the former system is promising in the power generation system with energy storage.

Continous Operation of Polymer Electrolyte Membrane Regenerative Fuel Cell System for Energy Storage

2006 ◽  
Vol 4 (4) ◽  
pp. 497-500 ◽  
Author(s):  
Bei-jiann Chang ◽  
Christopher P. Garcia ◽  
Donald W. Johnson ◽  
David J. Bents ◽  
Vincent J. Scullin ◽  
...  
Keyword(s):  
Energy Storage ◽  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Electrical Power ◽  
Cell System ◽  
Fuel Cell System ◽  
Electrolyte Membrane ◽  
Regenerative Fuel Cell ◽  
Smooth Transitions

NASA Glenn Research Center (GRC) has recently demonstrated a polymer electrolyte membrane (PEM) based regenerative fuel cell system (RFCS) that operated for five contiguous back-to-back 24h charge/discharge cycles over a period of 120h. The system operated continuously at full rated power with no significant reactant loss, breakdowns, or degradations from June 26 through July 1, 2005. It demonstrated a closed-loop solar energy storage system over repeated day/night cycles that absorbed solar electrical power profiles of 0–15kWe and stored the energy as pressurized hydrogen and oxygen gas in charge mode, then delivered steady 4.5–5kWe electrical power with product water during discharge mode. Fuel cell efficiency, electrolyzer efficiency, as well as system round-trip efficiency were determined. Individual cell performance and the spread of cell voltages within the electrochemical stacks were documented. The amount of waste heat dissipated from the RFCS was also reported. The RFCS demonstrated fully closed-cycle operation without venting or purging, thereby conserving reactant masses involved in the electrochemical processes. Smooth transitions between the fuel cell mode and electrolyzer mode were repeatedly accomplished. The RFCS is applicable to NASA’s lunar and planetary surface solar power needs, providing lightweight energy storage for any multikilowatt-electrical application, where an environmentally sealed system is required.

Development of 1 kW class polymer electrolyte membrane fuel cell power generation system

2002 ◽  
Vol 107 (1) ◽  
pp. 110-119 ◽  
Author(s):  
H.I. Lee ◽  
C.H. Lee ◽  
T.Y. Oh ◽  
S.G. Choi ◽  
I.W. Park ◽  
...  
Keyword(s):  
Power Generation ◽  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Generation System ◽  
Electrolyte Membrane ◽  
Power Generation System

scholarly journals Impact of MPL on Temperature Distribution in Single Polymer Electrolyte Fuel Cell with Various Thicknesses of Polymer Electrolyte Membrane

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2499
Author(s):  
Akira Nishimura ◽  
Tatsuya Okado ◽  
Yuya Kojima ◽  
Masafumi Hirota ◽  
Eric Hu
Keyword(s):  
Power Generation ◽  
Fuel Cell ◽  
Temperature Distribution ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Polymer Electrolyte Fuel Cell ◽  
Electrolyte Membrane ◽  
The Impact ◽  
Plane Temperature ◽  
Power Generation Performance

The impact of micro porous layer (MPL) with various thicknesses of polymer electrolyte membrane (PEM) on heat and mass transfer characteristics, as well as power generation performance of Polymer Electrolyte Fuel Cell (PEFC), is investigated. The in-plane temperature distribution on cathode separator back is also measured by thermocamera. It has been found that the power generation performance is improved by the addition of MPL, especially at higher current density condition irrespective of initial temperature of cell (Tini) and relative humidity condition. However, the improvement is not obvious when the thin PEM (Nafion NRE-211; thickness of 25 μm) is used. The increase in temperature from inlet to outlet without MPL is large compared to that with MPL when using thick PEM, while the difference between without MPL and with MPL is small when using thin PEM. It has been confirmed that the addition of MPL is effective for the improvement of power generation performance of single PEFC operated at higher temperatures than normal. However, the in-plane temperature distribution with MPL is not even.

scholarly journals EXPERIMENTAL STUDY AND ANALYSIS OF PHOTOVOLTAIC ENERGY STORAGES SYSTEM WITH D.C.

2020 ◽  
Vol 2 (5) ◽  
pp. 6-10
Author(s):  
Gausiya Mansoori ◽  
Amir Ansari
Keyword(s):  
Power Generation ◽  
Experimental Study ◽  
Electrical Power ◽  
Photovoltaic Cells ◽  
Maximum Power ◽  
Solar Irradiation ◽  
Generation System ◽  
Photovoltaic Energy ◽  
Photovoltaic Power ◽  
Power Generation System

Photovoltaic cells power generations are increased, because of lack of electrical power. Using of uniform solar irradiation in the photovoltaic cells, power-voltage characteristics must be unique and the maximum power is generated from PV cells. The MPPT Device is an essential part for photovoltaic power generation system. Because of nonlinearity behavior of irradiation and temperature in atmosphere.

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