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'Comfort ™' Design Module


Is this MODULE for you?

  • Do you want to make sure that your HVAC system will provide a comfortable environment for the occupants?
  • Are you designing an HVAC system to serve custom spaces that require a special approach?
  • Don't have time to manually go through ASHRAE Standard 55 procedures and lengthy calculations over and over again?

If so, the 'Comfort' Module is your solution.



This MS Excel Module cuts away the need for the designer to manually follow procedures and calculate the lengthy equations that are set out by ASHRAE Standard 55 for predicting indoor thermal comfort. Simply enter your space's design indoor environment conditions (air temperature, humidity, velocity, etc.) and the program will calculate the comfort prediction on the standard -3 to +3 scale.

The 'Comfort' Module lets you properly design HVAC systems for special rooms (e.g. swimming pool spaces with high humidity levels, rooms with all-glass walls that may have low temperatures in the winter, rooms with radiant heating or cooling floors or beams, etc.) while avoiding the time-consuming manual calculations that are otherwise required.

You can also use this Module to check the level of comfort at standard indoor conditions for common rooms (offices, labs etc.) that are otherwise taken without any thermal comfort analysis. This will help you to avoid designing an HVAC system that your clients may be unhappy with.

For the user's confidence, the 'Comfort' Module exposes every stage of the calculations.


How the module works and how you should use it

The 'Comfort' Module works in two steps. First, it calculates the mean radiant temperature that represents the radiant heat exchange conditions between the occupant and the room’s interior. Next, the Module accurately computes the occupants' heat balance and quantifies the occupants' thermal comfort.

Click on the thumbnail to see sample calculations of Mean Radiant Temperatures Mean Radiant Temperatures

The 'Comfort' Module uses the calculated radiant temperature to predict the occupant’s comfort level at selected air temperature, humidity and velocity parameters. Change the parameters until the occupant’s response to the selected parameters called 'predicted mean vote' calculated by the module at the bottom of the tab falls into the accepted -1 to +1 range and the percent of the dissatisfied persons is below 10%.

The 'Comfort' Module calculates heat losses (in some literature, referred to as the 'heat gain rates') of the occupant based on the convective, radiant, and evaporation heat balance equations as recommended by the ASHRAE Standard 55-2004.

Should your design criteria result in an unacceptable comfort prediction, simply change the initially selected indoor environment variables until the occupant's response (called "predicted mean vote") falls into the accepted -1 to +1 range and the percentage of dissatisfied persons is below 10%.

The user can also use the 'Comfort' Module to quickly check and quantify thermal comfort of standard spaces that are usually designed by engineers by using rules-of-thumb rather than procedures set by ASHRAE Standard 55.

The E-Book 'A-to-Z HVAC Design for Engineers' elaborates on the selection and assessment of thermal comfort conditions.


Click on the thumbnail to see sample calculations of Thermal Comfort Prediction of Thermal Comfort



Comfort Module

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