1.3.1 For the purpose of these Rules, the terms used have the meanings defined
in the following paragraphs. Terms not defined have the same meaning as in SOLAS
Chapter II-2 and the IGF Code.
1.3.2 Differential cell pressure is the difference in pressure across the
electrolyte as measured from one electrode to the other.
1.3.3 Exhaust air is exhaust from the cathode side of the fuel cell.
1.3.4 Exhaust gas is exhaust from the reformer or anode side of the fuel cell.
1.3.5 Fuel is fuel used by the fuel cell either directly or following onboard
reforming.
1.3.6 Fuel cell is a source of electrical power in which the chemical energy of
a fuel cell fuel is converted directly into electrical and thermal energy by
electrochemical oxidation. IEC 62282-2-100 Fuel cell technologies - Part 2-100:
Fuel cell modules – Safety, defines fuel cell to be an electrochemical
device that converts the chemical energy of a fuel and an oxidant to electrical
energy (DC power), heat and reaction products.
1.3.7 Fuel cell stack means the assembly of cells, separators, cooling plates,
manifolds and a supporting structure that electrochemically converts, typically,
hydrogen-rich gas and air-reactants to DC power, heat and other reaction products.
IEC 62282-2-100 Fuel cell technologies - Part 2-100: Fuel cell modules -
Safety, defines fuel cell stack to be an assembly of cells, separators,
cooling plates, manifolds and a supporting structure that electrochemically
converts, typically, hydrogen rich gas and air reactants to DC power, heat and other
reaction products.
1.3.8 Fuel cell module is an assembly of one or more fuel cell stacks, their
electrical connections and associated equipment and devices which are enclosed
within a single casing. IEC 60050-485 International Electrotechnical Vocabulary
(IEV) - Part 485: Fuel cell technologies, defines fuel cell module to be an
assembly incorporating one or more fuel cell stacks and other main and, if
applicable, additional components, which is intended to be integrated into a power
system.
1.3.9 Fuel cell power system is the group of components which may contain fuel
or hazardous vapours, fuel cell(s), fuel reformers, if fitted, and associated piping
systems. IEC60050-485 International Electrotechnical Vocabulary (IEV) - Part 485:
Fuel cell technologies, defines fuel cell power system to be a generator
system that uses one or more fuel cell module(s) to generate electric power and
heat.
1.3.10 Fuel cell space is a space or enclosure containing fuel cell power
systems or parts of fuel cell power systems.
1.3.11 Fuel cell power installation is the fuel cell power system and other
components and systems required to supply electrical power to the ship. It may also
include auxiliary systems for the fuel cell operation.
1.3.12 Fuel reformer is the arrangement of all related fuel-reforming equipment
for processing gaseous or liquid primary fuels to reformed fuel for use in the fuel
cells. The fuel reformer forms part of the fuel cell power system.
1.3.13 LEL means lower explosive limit, which, in the context of these Interim
Guidelines, should be taken as identical to the Lower Flammable Limit (LFL) and
which is 4,0 per cent volume fraction for hydrogen, note: for flammability limits
for hydrogen refer to ISO /TR 15916 Basic considerations for the safety of
hydrogen systems.
1.3.14 Oxidant is air, oxygen gas or oxygen rich compounds used to oxidise fuel
within the fuel cell stack.
1.3.15 Power conditioning system regulates and conditions the electrical output
of the fuel cell modules to meet the requirements of the onboard electrical
distribution system or electrical consumers supplied by the fuel cell power system.
The power conditioning system is an auxiliary system which forms part of the fuel
cell power installation.
1.3.16 Primary fuel is fuel supplied to the fuel cell power system.
1.3.17 Process air is air supplied to the reformer and/or the cathode side of
the fuel cell.
1.3.18 Reformed fuel is hydrogen or hydrogen-rich gas generated in the fuel
reformer.
1.3.19 Service profile for the purposes of these Rules is the operational
envelope of the fuel cell power system indicating all the intended operational
points including any short-term high-power operation.
1.3.20 Thermal management system provides cooling and/or heating to the fuel
cell power system, humidity management and condensate removal. The thermal
management system is an auxiliary system which forms part of the fuel cell power
installation.
1.3.21 Ventilation air is air used to ventilate the fuel cell space.
1.3.22 Ventilation system provides air to spaces or to enclosures. The
ventilation system is an auxiliary system which forms part of the fuel cell power
installation.