A chilled-water air-conditioning system is to be designed for a four-story offic

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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 lbm/h. All water flow velocities are to be maintained at less than 5 ft/s. 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: Supply and return pipe size (schedule 80) Floor pipe size (schedule 80) Delta P required for the pump Pump power requirements for eta = 0.55 Verification that the flow rate on each floor is 18,000 lbm/h. Evaluate all properties at 60 degree F. Be sure to state all assumptions made in the calculations.

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