ASHRAE OR-05-2-1-2005 Duct Loop Systems-Savings and Performance《环型管道系统的节能性和性能》.pdf
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1、OR-05-2- 1 Duct Loop Systems- Savings and Performance G.J. Levermore, PhD, CEng Member ASHRAE ABSTRACT Duct loops are often used in VAV air systems to save energy, ensure a balanced air delivery, and simplify fabrica- tion and construction. Duct loop performance is more compli- cated than that for a
2、 standard radial tree network, and simulation methods are required. Such simulation is examined. Part-load and asymmetric duct loops are also analyzed where numerical methods are required rather than dividing the symmetrical duct in two for easy calculation. The numerical method is discussed. The fu
3、ll andpart-load simulation ofduct loops and comparable networks are then considered. Signij- cant savings in fan power arepossible compared to radial tree and two-branched networks, but the non-duct pressure losses (coils, jlters, etc.) will determine the actual system saving in each case. However,
4、duct loops do require a larger amount of sheet metal in most cases for which the costs will count against the duct loops. However, economics are not considered in any depth in this paper: INTRODUCTION When air is distributed in ducts to a number of outlets there are many different distribution metho
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