Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
heat exchanger
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: function-based → ≡
Heat exchangers are primarily defined by their function - the transfer of thermal energy from one medium to another. Their identity is given by the HeatTransferFunction they are designed to realize, regardless of physical implementation (shell-and-tube, plate, air-cooled, etc.). The numerous constructive subtypes in the source hierarchies (shell-and-tube, plate, finned tube, etc.) all share the same fundamental function but differ in mechanism.
Validation status
Why primitive (necessary only)
Reviewer notes
FOL theory & disjointness
First-order logic theory (generated)
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Disjoint with
▸
Expert review
— accepted
Axiomatization steps
1
Identity-Giving Function
✓ done
HeatTransferFunction → HeatTransferProcess ⊑ HeatTransfer
▼
COPI-Core operation
HeatTransfer via process parent PlannedProcess
LLM rationale:
The identity-giving function is thermal energy transfer between two fluid streams or media. This is what makes a heat exchanger a heat exchanger regardless of its physical configuration. ISO 15926 explicitly states 'has the capability of HEAT EXCHANGING' and CFIHOS states 'intended to transfer heat from one object to another'.
▸
Expert review
— accepted
2
Genus Proximus
✓ done
PressureVessel · Assembly
▼
Genus (genus proximum)
Most specific superclass — may be a domain class like "Valve" or an IOF-Core root.
BFO/IOF-Core Root
bfo:Object branch
bfo:ObjectAggregate branch
bfo:ImmaterialEntity branch
LLM rationale:
All heat exchangers in oil & gas plants are pressure-containing vessels designed to transfer heat between two fluid streams through a separating wall; they are therefore classified as PressureVessel (the most specific enriched superclass). The PressureVessel genus is already axiomatized in this ontology (id 60) and provides the necessary structural differentia (pressure boundary, fluid containment). The identity-giving function (heat transfer) provides the functional differentia that distinguishes HeatExchanger from other pressure vessels.
▸
Expert review
— accepted
3
Differentia Specifica
✓ done
∃bearerOf.HeatTransferFunction
▼
Conditions that distinguish
Heat Exchanger
from sibling classes under genus
PressureVessel.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The HeatTransferFunction is the minimal differentiating condition that distinguishes heat exchangers from all other assemblies. This function is neither provided by the Assembly genus nor shared with sibling equipment types that perform other operations on fluids.
▸
Expert review
— accepted
4
Necessary Parts
✓ done
no necessary parts
▼
Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
These parts represent the minimal universal components - heat transfer surface and fluid passages are present in all heat exchanger configurations from simple double-pipe to complex shell-and-tube designs.
▸
Expert review
— accepted
5
Process Participation Signature ⟨I, O, T⟩
✓ done
PortionOfFluid → PortionOfFluid
▼
Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
Heat exchangers fundamentally require two fluid inputs at different temperatures and produce two outputs with adjusted temperatures. The key constraint is that fluids remain separated while heat is transferred.
▸
Expert review
More
Alternative labels
none
▼
Synonyms / alternative labels (comma-separated) — skos:altLabel
Language auto-detected on export (PT if the label contains accents, EN otherwise).
Properties as BFO qualities
0 of 1 selected
▼
Select which CFIHOS/DEXPI properties inhere in every instance of Heat Exchanger as
bfo:Quality subclasses.
Each selected property →
:HeatExchangerQuality ⊑ bfo:Quality, inheres in :HeatExchanger
Custom axioms
none
▼
Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on Heat Exchanger.
Write the restriction block in Turtle syntax (without the leading
rdfs:subClassOf).
Example: [ owl:onProperty :hasPart ; owl:someValuesFrom :Wellhead ]
Cross-standard divergences
none detected yet
▼
Click "Detect divergences" to analyse cross-standard disagreements for this cluster.
Source Definitions (2)
HEAT EXCHANGER — ClassOfFunctionalObject
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cfihos V2.0
heat exchanger — AbstractTagAndEquipmentClass
Definition text hidden (copyrighted standard) — sign in to view, or follow the source link above.
Provenance tiers (2)
Sources the pipeline cited while building this entry. Verbatim = the quote was copied word-for-word from that source; summary = paraphrased.
Linked competency questions
- answered Which equipment classes in COPI have iof:Assembly as their BFO genus root?
- answered What is the identity-giving function of a heat exchanger?
- answered What distinguishes a plate heat exchanger from a shell-and-tube heat exchanger?
- answered What is the genus of a plate heat exchanger?
- answered Is a heater a subtype of heat exchanger in COPI?
- answered What process does a heat exchanger participate in?
OWL/Turtle preview
Download .ttl
Numeric
COPI_* IRIs from copi-iri-map.tsv, with the readable name as a trailing comment. Names not yet in the map stay readable.
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ID 55 · claude-sonnet-4-20250514
Created 2026-04-13 22:16
Updated 2026-09-08 12:26
