Question 10.7: A strainer has a Cν rating of 60. It is to be used in a syst......

Equation 10-30 will yield the desired result:

l_{f}  =  2.31  \left(\frac{\dot{Q}}{C_{ν}}\right)^{2}                  (10-30)

l_{f}  =  2.31 \left(\frac{50}{60}\right)^{2}  =  1.6  ft  of  water

Heating and cooling units and terminal devices usually have head loss information furnished by the manufacturer. The head loss is often used to indicate the flow rate for adjustment of the system. Equation 10-29 may be used to estimate head loss at other than specified conditions.

\frac{l_{f1}}{l_{f2}}  =  \left(\frac{\dot{Q}_{1}}{\dot{Q}_{2}}\right)^{2}                  (10-29)