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Design Temperature Difference for Chillers
I get emails from time to time with questions that stem from the articles or the podcast. This was a great question, but I was not the best person to answer it. I reached out to Jeff Neiman, our resident HVAC School chiller tech, and he answered it. Here is the question: Hello Bryan, Thanks […]Read more
What is a Thermocouple?
In HVAC, we work with thermocouples for temperature measurement all the time, but we may not understand the difference between a thermocouple and other types of temperature measurement sensors. A thermocouple is just two different types of metal connected at a “junction” that generates a small voltage with a temperature change. Older furnaces would often […]Read more
What is a HSO (non-bleed) TXV/TEV?
There is a lot of misunderstanding about the HSO (hard shut-off) or “non-bleed” TXV (thermostat expansion valve) and what makes it shut off, why it exists, and how it “magically” opens. Once you understand the forces inside the valve, it is quite simple, obvious, and sadly devoid of any magic. The Three Forces The TXV […]Read more