What is the unit of Fouling factor (Rf) in F.P.S system?

1.	What is the unit of Fouling factor (R_f) in F.P.S system?
A.	Btu/hr ft<sup>2</sup>
B.	Btu/hr
C.	Btu/hr P
D.	Btu/hr P<sup>2</sup>
Answer» D. Btu/hr P<sup>2</sup>

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What is the unit of Fouling factor (Rf) in F.P.S system?

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What is the unit of Fouling factor (R_f) in F.P.S system?