=+10-29. Consider the system shown in Fig. 10-34, where the chillers are of equal size. Assume the sys-

tem is designed to circulate 1200 gpm (76 L/s) under full-load design conditions at 42 F (5.6 C)

and the tertiary circuits utilize water at the same temperature. Water is returned in the tertiary circuits at 60 F (15.6 C). At a part-load condition, 750 gpm (47 L/s) of water flows to the ter tiary circuits.

(a) What is the flow rate of the water in common pipe A?

(b) What is the tem-

perature of the water at point B?

(e) What is the load ratio (load/capacity) for chiller 2?

(d) Size the pipe, based on full-load design conditions (except the tertiary circuits).

(e) The secondary pump operates at 3500 rpm when fully loaded. Approximately what speed is required at the part-load condition?

(f) What is the power reduction at part load?