ISO 7547:2022

INTERNATIONAL ISO
STANDARD 7547
Third edition
2022-04
Ships and marine technology —
Air-conditioning and ventilation of
accommodation spaces and other
enclosed compartments on board
ships — Design conditions and basis
of calculations
Navires et technologie maritime — Conditionnement d'air et
ventilation des emménagements et autres compartiments fermés à
bord des navires — Conditions de conception et bases de calcul
Reference number
© ISO 2022
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Published in Switzerland
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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design conditions . 2
4.1 General . 2
4.2 Summer temperatures and humidity . 2
4.3 Winter temperatures . 2
4.4 Outdoor air . 3
4.5 Occupancy . . 3
5 Calculation of heat gains and losses . 3
5.1 Applicability . 3
5.2 Heat transmission . 4
5.2.1 Method of calculation . 4
5.2.2 Temperature differences between adjoining internal spaces . 5
5.2.3 Total heat transfer coefficients . 5
5.2.4 Calculation of the heat transfer coefficient . 5
5.2.5 Measurement of transmission areas . 7
5.3 Solar heat gain. 7
5.4 Heat gain from persons . . 8
5.5 Heat gain from lighting and other sources . 8
6 Airflow calculation . 9
6.1 Volume of space. 9
6.2 Supply airflow . 9
6.2.1 Air supply for air-conditioning . 9
6.2.2 Air supply for ventilation . 9
6.3 Temperature of supply airflow . 10
6.4 Exhaust airflow . 10
6.4.1 Volume of airflow . 10
6.4.2 Exhaust system . 10
6.5 Air balance . 10
Annex A (informative) Guidance and good practice in the design of ventilation and air-
conditioning systems in ships . .11
Annex B (informative) Thermal conductivities of commonly used construction materials .14
Annex C (normative) Additional requirements for machinery control-rooms .15
Annex D (normative) Additional requirements for the wheelhouse .17
Annex E (normative) Additional requirements for dry provision store rooms .19
Annex F (normative) Additional requirements for hot-air heating of wheelhouse windows .21
Bibliography .22
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Foreword
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 3, Piping and machinery.
This third edition cancels and replaces the second edition (ISO 7547: 2002), as well as ISO 8862:1987,
ISO 8863:1987, ISO 8864:1987 and ISO 9099:1987, which have been technically revised. It also
incorporates the Technical Corrigendum ISO 7547:2002/Cor.1:2008.
The main changes are as follows:
— incorporation of smaller ship ventilation standards (ISO 8862, ISO 8863, ISO 8864, ISO 9099) into
this document;
— minor editorial changes made in conformity with the ISO/IEC Directives, Part 2, 2021.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
INTERNATIONAL STANDARD ISO 7547:2022(E)
Ships and marine technology — Air-conditioning and
ventilation of accommodation spaces and other enclosed
compartments on board ships — Design conditions and
basis of calculations
1 Scope
This document specifies design conditions and methods of calculation for air-conditioning and
ventilation of accommodation spaces on board seagoing merchant ships for all conditions, except those
encountered in extremely cold or hot climates (i.e. with lower or higher conditions than those stated
in 4.2 and 4.3). This document also provides special considerations for machinery control-rooms,
wheelhouse, and dry provision store rooms in Annexes C, D and E.
NOTE Statutory requirements, rules and regulations can be applicable to the individual ships concerned.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 80000-5, Quantities and units — Part 5: Thermodynamics
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 80000-5 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
accommodation
space used as public rooms, cabins, offices, hospitals, cinemas, games and hobby rooms, hairdressing
salons and pantries without cooking appliances
3.2
machinery control-room
space containing the system of the main alarm displays and the controls for the propulsion machinery
3.3
wheelhouse
enclosed area of the bridge, excluding radio cabin
3.4
air-conditioning
form of air treatment whereby temperature, humidity, ventilation (3.5) and air cleanliness are all
controlled within limits prescribed for the enclosure to be air-conditioned
3.5
ventilation
provision of air to an enclosed space, sufficient for the needs of the occupants or the process
3.6
relative humidity
ratio, in humid air, expressed as a percentage, of the water vapour actual pressure to the saturated
vapour pressure at the same dry bulb temperature (3.7)
3.7
dry bulb temperature
temperature indicated by a dry temperature-sensing element shielded from the effects of radiation
EXAMPLE The bulb of a mercury-in-glass thermometer is an example of a dry temperature-sensing element.
3.8
dry provision store room
enclosed compartment, provided with lighting and ventilation (3.5), for storage of provisions for the
ship’s crew
4 Design conditions
4.1 General
The air-conditioning and ventilation system shall be designed for the indoor air conditions specified
in 4.2 and 4.3 in all accommodation spaces defined in 3.1 at the stated outdoor air conditions and the
outdoor supply airflow, ventilation and air balance given in 6.2.1, 6.2.2 and 6.5 respectively.
Machinery control rooms, the wheelhouse, and dry provision store rooms shall meet the additional
ventilation and air conditioning requirements of Annexes C, D and E, respectively.
Hot air heating systems for ship wheelhouse windows shall meet the additional requirements of
Annex F.
NOTE All temperatures stated are dry bulb temperatures.
4.2 Summer temperatures and humidity
Summer temperatures and humidity are as follows:
a) outdoor air: +35 °C and 70 % rel
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