Thermal Comfort PMV-PPD (ISO 7730 / Fanger)

Thermal Comfort PMV-PPD (ISO 7730 / Fanger) | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Math & Numbers
Input types: number, select
Output type: json
Sample coverage: 4
API ready: Yes

Overview

Thermal Comfort PMV-PPD calculates Predicted Mean Vote (PMV) and Predicted Percentage Dissatisfied (PPD) using the Fanger equations from ISO 7730 and ASHRAE 55. Enter air temperature, mean radiant temperature, air velocity, humidity, metabolic rate, and clothing insulation to receive a thermal sensation label and supporting results.

When to use

Estimate perceived thermal comfort in offices, classrooms, and other occupied spaces.
Compare comfort conditions for different temperatures, humidity levels, clothing, or activity rates.
Review PMV and PPD values during HVAC, building, or indoor-environment assessments.

How it works

1Enter air temperature Ta and mean radiant temperature Tr, choosing Celsius or Fahrenheit.
2Provide relative air velocity, relative humidity, metabolic rate in met, and clothing insulation in clo.
3Optionally enter external work; it defaults to 0 met for sedentary activities.
4The tool solves clothing surface temperature iteratively and returns PMV, PPD, and a seven-level thermal sensation label.

Use cases

Evaluate office comfort using indoor temperature, radiant temperature, humidity, activity, and clothing assumptions.
Compare summer and winter clothing scenarios with different clo and met values.
Communicate comfort results with PMV, PPD, and a clear sensation label.

Examples

1. Office winter comfort assessment

Building engineer

Background

A building engineer is reviewing a winter office condition with equal air and mean radiant temperatures, moderate humidity, seated office activity, and business clothing.

Problem

Estimate whether occupants are likely to feel neutral and determine the predicted dissatisfied percentage.

How to use

Enter Ta=22 °C, Tr=22 °C, relative air velocity=0.1 m/s, RH=50%, met=1.2, clo=1.0, and external work=0.

{"ta":22,"tr":22,"tempUnit":"°C","var":0.1,"rh":50,"met":1.2,"clo":1.0,"work":0,"decimalPlaces":3}

Outcome

The result is PMV=-0.025 with a Neutral label and PPD=5.01%.

2. Summer light-clothing comparison

Indoor-environment analyst

Background

An analyst is checking a summer space with 24.5 °C air and radiant temperatures, 50% relative humidity, light clothing, and seated activity.

Problem

Quantify the perceived sensation and dissatisfaction level under the selected summer conditions.

How to use

Enter Ta=24.5 °C, Tr=24.5 °C, relative air velocity=0.15 m/s, RH=50%, met=1.0, clo=0.5, and external work=0.

FAQ

What do PMV and PPD mean?

PMV estimates the average thermal sensation from −3 cold to +3 hot. PPD estimates the percentage of people predicted to be dissatisfied.

What temperature inputs are required?

Enter air temperature Ta and mean radiant temperature Tr. Both can be supplied in Celsius or Fahrenheit.

What is the typical air velocity for an office?

The default relative air velocity is 0.1 m/s, described as typical for an office.

What do met and clo represent?

Met represents metabolic activity, while clo represents clothing insulation. One met equals 58.2 W/m², and one clo equals 0.155 m²·K/W.

What happens if external work is not entered?

External work W defaults to 0 met.

{"ta":24.5,"tr":24.5,"tempUnit":"°C","var":0.15,"rh":50,"met":1.0,"clo":0.5,"work":0,"decimalPlaces":3}

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Examples that match this tool

Continue with connected tools and hubs

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Office winter comfort assessment

2. Summer light-clothing comparison

FAQ

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