Hot, cold, humid or draft complaints
Habitability & Environmental Quality · SERVICE 05
Onboard Thermal Comfort Survey
A cabin can meet a temperature setpoint and still feel uncomfortable. Air speed, humidity, radiant temperature, vertical temperature difference, clothing, activity and uneven distribution all influence how people experience the space. Vessel Doctor assesses these factors in occupied vessel areas and translates them into practical HVAC and habitability findings.
ENVIRONMENTAL QUALITYClear evidence→
VESSEL DOCTOROnboard Thermal Comfort Survey
SURVEY PROFILEHabitability & Environmental Quality
05/19
Original category-specific diagnostic visual
01
WHY THIS SURVEY MATTERS
Evidence before assumption.
Thermal complaints often move from one location to another when only thermostat settings are adjusted. Measurement helps identify insufficient airflow, excessive drafts, solar or machinery heat gain, poor diffuser balance, humidity problems and differences between cabins, decks or operating conditions.
02
MEASUREMENT SCOPE
What we measure.
- ✓Dry-bulb air temperature
- ✓Relative humidity
- ✓Air velocity and local drafts
- ✓Globe or mean radiant temperature where required
- ✓Vertical temperature gradient
- ✓Supply and return air conditions
- ✓PMV and PPD indices when the method and assumptions are appropriate
- ✓Space-to-space variation and HVAC operating status
03
TIMING & APPLICATION
When to request it.
Newbuilding accommodation trials
HVAC balancing or recommissioning
After cabin refurbishment or layout changes
Recurring condensation or uneven-temperature problems
Comfort-class or owner-specification verification
04
SURVEY PROCESS
A controlled route from plan to finding.
Define
Confirm the decision, vessel condition and evaluation basis.
Prepare
Agree locations, safe access, instruments and operating matrix.
Measure
Capture traceable data with conditions documented during measurement.
Interpret
Evaluate against the agreed basis and isolate meaningful patterns.
Report
Issue findings, limitations and focused next actions.
05
TECHNICAL DELIVERABLE
What you receive.
- ✓Space and measurement-point plan
- ✓Environmental and HVAC operating records
- ✓Thermal parameters and comfort indices where applicable
- ✓Identification of inconsistent or problematic spaces
- ✓Probable contributors and corrective recommendations
- ✓Retest plan after HVAC adjustments when requested
06
STANDARDS & PROJECT CRITERIA
The governing basis comes first.
Use applicable class habitability criteria, owner specifications and relevant editions of ISO 7726 and ISO 7730 or other contractually agreed thermal-comfort methods. Clearly document all clothing, activity and environmental assumptions used in PMV/PPD calculations.
Important
Explore our standards directory↗Acceptance remains subject to the applicable flag administration, classification society, contract, vessel specification and authorised reviewing party.
ASIA + WORLDWIDE ATTENDANCE
Onboard Thermal Comfort Survey wherever the vessel needs it.
Vessel Doctor coordinates this service for vessels in Singapore, India, Malaysia, Sri Lanka, Indonesia, Thailand, wider Asian maritime centres and ports worldwide. The scope can support technical managers, marine superintendents, ship agents, owners, operators, shipyards and consultants who need documented onboard evidence.
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SERVICE FAQ
Questions project teams ask.
Every scope is confirmed against the actual vessel, timing and decision requirement.
01Is temperature alone enough to assess comfort?+
No. Humidity, air speed, radiation, activity and clothing can change comfort even at the same air temperature.
02Can the survey identify poor HVAC balancing?+
It can reveal uneven conditions and airflow indicators. Detailed testing, adjusting and balancing may require additional duct and system measurements.
03Should the vessel be occupied during testing?+
Representative occupancy and operating loads are preferable where practical because people and equipment affect the heat balance.
04Can thermal comfort be combined with IAQ?+
Yes. Combining both surveys often provides a more complete assessment of accommodation performance.
START A TECHNICAL DISCUSSION
Plan your onboard thermal comfort survey.
Share the vessel, location, operating condition and reporting purpose. We will help shape a focused, technically defensible survey scope.