Power packs

Because of the low operating temperature and ease of fabrication for low power units, PFFCs are the most likely fuel cell to be introduced in portable power packs. PFFCs in sizes of 300—500 W are being considered as a power source, eg, 4-h duration, 300 W, 1.2 kW, for the modem soldier operating in the enclosed environment of a self-contained protective suit, which has faciUties for air conditioning, radio communication, etc. Analytic Power Corp. (Boston) is assessing the use of PFFCs for this appHcation. 

Figure A13.7(a) Electrostatic spray gun with the power pack unit (Courtesy Statfied)...

Power pack unit (=- 0-100 kV d.c. negative) with electrostatic power outfit... 

Shown on vessel with power pack and control signal... 

To meet the challenges posed by horizontal drilling in particular, a system has been developed to make the measurements at or near the bit and transmit them to the mud telemetry section of the MWD bottomhole assembly. The resistivity at the bit tool is similar to the toroidal resistivity tool described in the section titled Resistivity Logs. As shown in Figure 4-297, the Anadrill geosteering package includes below the Power Pack mud motor ... 

One of the most ingenious ways in which corrosion is inhibited is to strap a power pack to each leg (just above the level of the sea) and apply a continuous reductive current. An electrode couple would form when a small portion of the iron oxidizes. The couple would itself set up a small voltage, itself promoting further dissolution. The reductive current coming from the power pack reduces any ferric ions back to iron metal, which significantly decreases the rate at which the rig leg corrodes. 

Clearly, we want the net current at the iron to be zero (hence no overall reaction). The rate of corrosion would be enhanced if the power pack supplied an oxidative current, and wasteful side reactions involving the seawater itself would occur if the power pack produced a large reductive current. The net current through the iron can be positive, negative or zero, depending on the potential applied to the rig s leg. The conserver of the rig wants equilibrium, implying no change. 

V voltage, e.g. of a power pack Vo frequency following transmission... 

The fuel cell power pack includes the fuel cell power module, an ultracapacitor storage unit, hydrogen storage tanks, thermal manage-... 

Since these forklifts had previously been powered by heavier batteries, one issue in the modification was weight. The fuel cell power pack itself was relatively easy to integrate into the equipment since it was smaller and lighter than the lead acid battery system. But, since the battery provided part of the counterbalance, additional weight was added to provide enough stability for the forklift. 

During reduction, electrons travel/rom the power pack, through the electrode, transfer across the electrode-solution interface and enter into the electroactive species in solution. Conversely, during oxidation, electrons move in the opposite direction, and are conducted away from the electroactive material in solution and across the electrode-solution interface as soon as the electron-transfer reaction occurs. (Incidentally, these different directions of electron movement explains why an oxidative current has the opposite sign to a reductive current, cf. Section 1.2.)... 

As an electroanalyst, however, we need to note that the overwhelming majority of cells are not of such a simple nature. The electrode reactions in such cells usually have to be forced, that is, an external power pack is incorporated into the circuit in order to make sure that the intended electrode reactions will occur. 

Figure 5.2 Schematic representation of a cell with a power pack (in series) to force electron-transfer reactions to occur also indicated on the circuit are the anode (the positive electrode at which oxidation occurs) and the cathode (the negative electrode at which reduction occurs). Note that this figure would be equivalent to Figure 5.1 if the power pack was to drive the electrons in the opposite direction.

DMFC 200 W portable power pack development Market introduction for replacement of battery (2006)... 

Shipments of fuel cell-equipped mobile devices could grow very rapidly if they can eliminate the need for frequent recharging of current battery-powered models. The Medis 24/7 Power Pack in April 2007. It is a portable, disposable power source for small electronic devices such as cell phones and MP3 players. Manufactured by Medis Technologies, it is based on Direct Liquid Fuel cell technology, and may be of particular utility in military applications. Elsewhere, MTI MicroFuel Cells manufactures a power pack for portable electronics that is based on direct methanol fuel cell technology that it calls Mobion. 

InfraStruXure Mobile Power Pack Smart-UPS SureArrest PowerChute NetworkAIR Silcon UPS Schneider Electric SA... 

Formira Power Pack Renew Power Motorola Ventures BASF AG... 

---