Question 1

What is psychrometrics?

Accepted Answer

Psychrometrics is the engineering field focused on the thermodynamic properties of air-water vapor mixtures and their behavior in HVAC systems. It involves studying relationships between temperature, humidity, enthalpy, and other air properties.

Question 2

Who uses psychrometric calculators?

Accepted Answer

HVAC engineers, mechanical engineers, building designers, energy analysts, facility managers, and engineering students use psychrometric calculators to analyze air properties, design climate control systems, and optimize energy efficiency.

Question 3

What calculations can Psychrometrix perform?

Accepted Answer

Psychrometrix calculates wet bulb temperature, dew point temperature, enthalpy, humidity ratio, specific volume, relative humidity, air density, and saturation vapor pressure. It also visualizes HVAC processes like heating, cooling, humidification, and dehumidification on an interactive psychrometric chart.

Question 4

Is Psychrometrix free to use?

Accepted Answer

Yes, Psychrometrix is completely free to use. It runs in your web browser without requiring any installation or registration. All calculations are performed locally for fast, private, and secure access.

Question 5

Does Psychrometrix include weather or climate data?

Accepted Answer

Yes. Psychrometrix includes ASHRAE climate design data for over 100 cities worldwide based on ASHRAE Fundamentals Chapter 14. Select a country, city, and season (summer or winter) to auto-fill outdoor conditions including dry-bulb temperature, wet-bulb temperature, relative humidity, and altitude.

Question 6

What HVAC processes can Psychrometrix simulate?

Accepted Answer

Psychrometrix supports heating, cooling, humidification, dehumidification, mixing, and heat recovery. You can chain multiple processes in any order to simulate complete air handling unit (AHU) sequences and visualize each step on the psychrometric chart.

Question 7

What is the difference between a psychrometric chart and a Mollier diagram?

Accepted Answer

A psychrometric chart plots humidity ratio versus dry-bulb temperature, while a Mollier diagram (or psychrometric chart in Mollier coordinates) plots enthalpy versus humidity ratio. Psychrometrix supports both modes with a single toggle. Mollier diagrams are more commonly used in European HVAC standards.

Question 8

Does Psychrometrix support both SI and Imperial units?

Accepted Answer

Yes. Psychrometrix fully supports both SI (Celsius, kPa, kJ/kg) and Imperial (Fahrenheit, psi, Btu/lb) unit systems. All chart axes, labels, and calculation outputs update automatically when you switch between systems.

Question 9

Can I export my psychrometric analysis as a PDF?

Accepted Answer

Yes. Psychrometrix allows you to export your complete analysis including the psychrometric chart, all calculated properties, and the process chain as a professional PDF report. You can also export high-resolution images of the chart.

Question 10

How accurate are the ASHRAE climate design data values?

Accepted Answer

The climate data in Psychrometrix is based on ASHRAE Fundamentals Handbook Chapter 14, which provides standard design conditions for over 100 cities worldwide. The data includes summer and winter design dry-bulb temperatures, wet-bulb temperatures, mean coincident conditions, and altitude information.

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