Study of a fuel cell network with water electrolysis for improving partial load efficiency of a residential cogeneration system

2006 ◽  
Vol 30 (8) ◽  
pp. 567-583 ◽  
Author(s):  
S. Obara
Keyword(s):  
Fuel Cell ◽  
Water Electrolysis ◽  
Cell Network ◽  
Partial Load ◽  
Cogeneration System ◽  
Residential Cogeneration

Installation Plan of a Fuel Cell Cogeneration System

2014 ◽  
pp. 103-135
Keyword(s):  
Fuel Cell ◽  
Power Plants ◽  
Water Electrolysis ◽  
Cell Network ◽  
System A ◽  
Partial Load ◽  
Exhaust Heat ◽  
Cogeneration System ◽  
Cell Energy ◽  
Residential Cogeneration

This chapter consists of two sections, ‘Installation Plan of a Fuel Cell Microgrid System Optimized by Maximizing Power Generation Efficiency’ and ‘Fuel Cell Network with Water Electrolysis for Improving Partial Load Efficiency of a Residential Cogeneration System.’ A microgrid that use PEFC may significantly reduce the environmental impact when compared with traditional power plants. The 1st section investigates what occurs when a set of PEFCs and a natural gas reformer are connected to the microgrid in an urban area. In the 2nd section, a fuel cell energy network which connects hydrogen and oxygen gas pipes, electric power lines and exhaust heat output lines of the PEFC cogeneration for individual houses is analyzed.

Study of a Small-Scale Fuel Cell Cogeneration System with Methanol Steam Reforming Considering Partial Load and Load Fluctuation

2005 ◽  
Vol 127 (4) ◽  
pp. 265-271 ◽  
Author(s):  
S. Obara ◽  
K. Kudo
Keyword(s):  
Fuel Cell ◽  
Cost Estimation ◽  
Energy Cost ◽  
Electric Heater ◽  
Small Scale ◽  
Load Fluctuation ◽  
Partial Load ◽  
Cogeneration System ◽  
Conventional Systems ◽  
Type Fuel

Performance analysis and cost estimation are carried out for a cogeneration system consisting of a solid high-polymer-film-type fuel cell with a methanol reformer applied to individual houses. For the operation of the fuel cell under a partial load, a unique point of this system is the shifting of the driving point by the electric heater. Considering the annual energy cost for an average house in Sapporo, Japan, the energy cost of this system is shown to be 1.42 times that of conventional systems in which a cogeneration system is not installed.

Study of Efficiency Improvements in a Fuel-Cell-Powered Vehicle Using Water Electrolysis by Recovering Regeneration Energy and Avoiding Partial Load Operation

2005 ◽  
Vol 2 (3) ◽  
pp. 202-207 ◽  
Author(s):  
S. Obara ◽  
K. Kudo
Keyword(s):  
Energy Efficiency ◽  
Fuel Cell ◽  
Load Condition ◽  
Water Electrolysis ◽  
Maximum Output ◽  
Storage Mechanism ◽  
Vehicle Operation ◽  
Partial Load ◽  
Drive Motor ◽  
Low Efficiency

Improvements in efficiency of a fuel-cell-powered vehicle have been studied using water electrolysis as the energy storage mechanism. Three methods are proposed for this purpose: 1. The reformer and fuel cell are divided into two or more units, and the maximum output of each unit is set to be small, which reduces the partial load operation, 2. all the fuel cell units are operated above the low efficiency partial load condition and excess electricity is supplied to another fuel cell unit to generate hydrogen and oxygen by water electrolysis, and these gases are compressed and stored, and arbitrary fuel cell units are supplied and they generate electricity, 3. deceleration periods perform water electrolysis of the fuel cell units using the electric power generated by the drive motor, and both gases are compressed and they store in each cylinder. The LA4 cycle (EPA urban dynamometer schedule) was introduced for the vehicle operation. The energy saving effects of the abovementioned methods were studied and were shown to increase the energy efficiency by 1.23 to 1.72 times compared to that for the conventional method.

Exergy Analysis of a Hybrid Micro Gas Turbine Fuel Cell System Based on Existing Components

2012 ◽  
Author(s):  
D. P. Bakalis ◽  
A. G. Stamatis
Keyword(s):  
Fuel Cell ◽  
Hybrid System ◽  
Exergy Analysis ◽  
Cell System ◽  
System Component ◽  
Utilization Factor ◽  
Fuel Cell Stack ◽  
Micro Gas Turbine ◽  
Partial Load ◽  
Set Up

A hybrid system based on an existing recuperated microturbine and a pre-commercially available high temperature tubular solid oxide fuel cell is modeled in order to study its performance. Individual models are developed for the microturbine and fuel cell generator and merged into a single one in order to set up the hybrid system. The model utilizes performance maps for the compressor and turbine components for the part load operation. The full and partial load exergetic performance is studied and the amounts of exergy destruction and efficiency of each hybrid system component are presented, in order to evaluate the irreversibilities and thermodynamic inefficiencies. Moreover, the effects of various performance parameters such as fuel cell stack temperature and fuel utilization factor are investigated. Based on the available results, suggestions are given in order to reduce the overall system irreversibility. Finally, the environmental impact of the hybrid system operation is evaluated.

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