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How to calculate energy saved in HVAC Duct?

How to calculate energy saved in HVAC Duct?

How to calculate energy saved in HVAC Duct?

(OP)
I have two different materials for air ducts.  If I have cool air flowing through the first duct, the temperature difference between the inlet and outlet of the duct is 3 degrees C.  For the second duct it is 5 degrees C.  The first duct is obviously a better insulator, but how do I quantify how much energy is saved from the first duct compared to the second duct?

Thanks,
Jeff

RE: How to calculate energy saved in HVAC Duct?

mass flow rate x specific heat x temperature difference

RE: How to calculate energy saved in HVAC Duct?

Or simpler yet:

1.07 x cfm x temperature difference

RE: How to calculate energy saved in HVAC Duct?

(OP)
What units does that give me (the 1.07 x cfm x delta T)?  

RE: How to calculate energy saved in HVAC Duct?

This sounds like homework to me.........

RE: How to calculate energy saved in HVAC Duct?

(OP)
It isn't homework, it's trying to help a structural design engineer remember thermodynamics and heat transfer which has escaped me.

Thanks for your help.

RE: How to calculate energy saved in HVAC Duct?

What units does that give me (the 1.07 x cfm x delta T)?  
BTU/hr

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