How to Define Human Thermal Comfort? || Which Parameters define it? HVAC Project Basic Foundation

Design Project using ANSYS FLuent on Thermal Comfort
I am grateful to Prithvi Ramesh, Department of Mechanical Engineering, BITS Pilani - Goa Campus.
His research interest lies in the application of Computational Fluid Dynamics for Aerospace.
The video includes:
How to Guage the level of comfort of humans?
Definition of Human Comfort
Thermal Comfort Parameters
PMV Predicted Mean Vote
Optimal Range - Hot or Cold
PPD Predicted Percentage of Dissatisfied
Empirical Equation
Personal Parameters - Metabolic Rate, Clothing Insulation
External Parameters - Air Temperature, Air Velocity, Mean Radiant Temperature, Relative Humidity
Inputs of Energy Balance
The 21st century has witnessed an unprecedented increase in volumes of people travelling through air. Before the corona virus pandemic more than 7000 flights took off and landed in one day all around the world. With the industry poised to return to pre-pandemic levels of service within a few years, a lot of attention has been paid to improving comfort of passenger’s on-board flights by aircraft manufacturers and airlines alike in particular the thermal comfort of humans inside aircrafts. But what exactly is Thermal comfort? Thermal comfort is a psychological feeling of satisfaction with the thermal conditions surrounding a human being. Is a person satisfied or dissatisfied with the environment around him/her? Is it too hot or cold? Is it too humid and sweaty? The project covered in the video series aims to understand thermal comfort using empirical parameters and apply these generic concepts to aircraft and to study the environment inside a typical aircraft cabin (the short-haul Airbus A320 is one of the most common forms of flight today and has been chosen for this study).
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