In the trade, we talk a lot about changes in enthalpy, especially when we are looking at total heat exchange over an evaporator. Sometimes, you will bump into the word entropy, and I wanted to take a stab at making it more understandable. Many people understand entropy as the condition in which molecules become more […]

I knew a tech when I was just starting who was hands down, no questions asked, the best technician at the company I worked. EVERYONE, we are talking over 60 techs… we all knew it. His name was Mike Gilford. Being the little brown-nosing ladder climber I was, I made a complete study of Mike […]

Friction rate is a value located on a ductulator. We use it during the design phase of a duct system to predict the operating static pressure of a duct system. The challenge with friction rate is that it is often misapplied by folks using a rule of thumb (ROT). In order to apply friction rate properly, […]