A chilled-water air-conditioning system is to be designed for a four-story office complex, as outlined in Fig. P1-7. Each story requires a chilled-water flow rate of 18,000
. All water flow velocities are to be maintained at less than 5 
A single-size pipe is used for the vertical supply and return pipes, and a single-size pipe is used on each floor. Each floor has 100 ft of pipe and two valves, one check and one gate. The pressure drop across the air-handling unit on each floor is 50 psi, and the pressure drop across the chiller is 100 psi. Neglecting the losses of any elbows or tees, specify the following:
(a) Supply and return pipe size (schedule 80)
(b) Floor pipe size (schedule 80)
(c) t::.P required for the pump
(d) Pump power requirements for 1] = 0.55
(e) Verification that the flow rate on each floor is 18,000 lbmlh.
Evaluate all properties at 60°F.Be sure to state all assumptions made in the calculations.