Patent ID: 7017606
Filing Date: 2006-03-28
Classification: F24F,F25D,Y10T

Abstract:
1. A primary-secondary pumping system comprising: at least one primary pump having a primary inlet and a primary outlet; at least one thermal plant, each having a plant outlet fluid flow connected to a respective one primary inlet of the at least one primary pump and each thermal plant having a plant inlet; a secondary pump having a secondary inlet and a secondary outlet; a return manifold fluid flow connected to each of the primary inlets of the at least one primary pump; a primary collection pipe fluid flow connected to each of the plant outlets of the at least one thermal plant and fluid flow connected to the secondary, inlet of the secondary pump; a return pipe fluid flow connected between the secondary outlet and the return manifold; and a common pipe fluid flow connected between the return pipe and the primary collection pipe, such that the common pipe has a first diameter, the return pipe has a second diameter, and the primary collection pipe has a third diameter and such that the first diameter is smaller than the second diameter or the third diameter.