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Hey Ed, Is There One Measurement We Can Take, Truly Giving Us an Idea of a System’s Performance?


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In this edition of "Hey Ed", Ed discusses if there is one measurement we can take, truly giving us an idea of a system's performance?

Hey Ed, if you’re only able to take one measurement that can truly give an idea of system performance, what would it be? If I can only take one measurement, I’m gonna take a wet bulb reading in both the supply and the return. I’m going to use an enthalpy chart and convert those wet bulb readings into enthalpy, which is telling me how many BTUs per pound the air holds. With that, I know on a perfect system a nominal 400 CFM per ton times 6.66×4.5 gives me 12,000. So, I can use that 6.66 as a good average. So, ultimately what am I really looking for? I’m looking for a change in enthalpy somewhere between six and seven to give me an indication that that system is doing what it's supposed to and that’s the way I see it!

In this edition of “Hey Ed”, Ed discusses if there is one measurement we can take, truly giving us an idea of a system’s performance?

Ed Janowiak is the Manager of HVAC Design Education at ACCA.


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Posted In: Hey Ed, Technical Tips

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