Accession Number : ADA293452

Title :   Linear Motor Free Piston Compressor.

Descriptive Note : Final rept.,

Corporate Author : ANALYTIC POWER CORP BOSTON MA

Personal Author(s) : Bloomfield, David P.

PDF Url : ADA293452

Report Date : 17 FEB 1995

Pagination or Media Count : 30

Abstract : A Linear Motor Free Piston Compressor (LMFPC), a free piston pressure recovery system for fuel cell powerplants was developed. The LMFPC consists of a reciprocating compressor and a reciprocating expander which are separated by a piston. In the past energy efficient turbochargers have been used for pressure large (over 50 kW) fuel cell powerplants by recovering pressure energy from the powerplant exhaust. A free piston compressor allows pressurizing 3 - 5 kW sized fuel cell powerplants. The motivation for pressurizing PEM fuel cell powerplants is to improve fuel cell performance. Pressurization of direct methanol fuel cells will IC required if PEM membranes are to be used Direct methanol oxidation anode catalysts require high temperatures to operate at reasonable power densities. The elevated temperatures above 80 deg C will cause high water loss from conventional PEM membranes unless pressurization is employed. Because pressurization is an energy intensive process, recovery of the pressure energy is required to permit high efficiency in fuel cell powerplants. A complete LMFPC which can pressurize a 3 kW fuel cell stack was built. This unit is one of several that were constructed during the course of the program. jg

Descriptors :   *LINEAR SYSTEMS, *PISTONS, *COMPRESSORS, *MOTORS, DENSITY, PERFORMANCE(ENGINEERING), WATER, HIGH TEMPERATURE, ENERGY, EFFICIENCY, OXIDATION, METHANOLS, MACHINES, CATALYSTS, POWER, LOSSES, PRESSURIZATION, FUEL CELLS, RECIPROCATING ENGINES, HYDRAULIC EQUIPMENT, ANODES, TURBOCHARGERS.

Subject Categories : Hydraulic and Pneumatic Equipment
      Physical Chemistry
      Electrochemical Energy Storage
      Reciprocating and Rotating Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE