22. A Chilled-Fluid (Not Water) System For A Five-Story 50,000-Sq-Ft Office Building Is To Be De- The Required Loops, Together With The Characteristics Of Devices In The In- 7 Cfs. The Signed. A Sketch Of Dividual Lines, Is Presented In Fig. P1-22. The Required Flow Rate From The Chiller Is L Air-Handling Units On Each Floor (Really Just Heat Exchangers) 22. A chilled-fluid (not water) system for a five-story 50,000-sq-ft office building is to be de- the required loops, together with the characteristics of devices in the in- 7 cfs. The signed. A sketch of dividual lines, is presented in Fig. P1-22. The required flow rate from the chiller is l air-handling units on each floor (really just heat exchangers) require 3 cfs each, except that floor 4 requires 5 cfs Two options are available: (1) close the valves on floors 1,2,3, and 5 until the desired flow rate is obtained on floor 4, and (2) keep all valves open but place a second pump on floor 4 to provide the desired flow rate. Using a Hardy-Cross simulation with friction-factor major- loss representation, find the pump power (outputs) and sizes (increases in head) required for the two options. Find the size of the three different-diameter pipes (all schedule 40) re- quired. All vertical pipes (risers) and the return loop will be one diameter, pipes on all floors except floor 4 will be a single diameter, and the pipes on floor 4 will be a single diameter. Size the pipes so that velocities less than of 10 ft/s are maintained. Compare the outputs of the two options. Which would you recommend? Why? Fluid properties are: Density = 57.9 lbm/ft3 Viscosity 0.001286 lbm/ft-s