Does static regain actually save energy?

January 31, 2012  |   FAQ's   |     |   13,162 Comments

Most VAV ductwork systems are sized for a 1% ASHRAE cooling day for 86 hrs/year of peak demand. The average VAV fan system operates at 65-75% capacity for 4000 hours/year and operates at minimum 35% capacity for 2000 hrs/year. With static regain using 30% smaller VAV spiral duct sizes, there is less BHp-Hrs used for part load spiral systems estimated at 5-10% less than rectangular ductwork systems. Actual operating leakage savings using smaller spiral ducts may be 5-10% of operational costs.

YES, static regain saves a lot of energy, but very few Energy Model Programs recognize the option.

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