Consider a pumping system used in a cooling water loop. Water is drawn from a tank, which maintains a height of 2 m of water. It then enters the pump and then passes through the process heat exchanger, where it is heated. The water is then cooled back to cooling water temperature using a chiller (another heat exchanger). Finally, water exits the chiller and is circulated back to the original tank, forming a closed loop. All equipment is at ground level. All pipe in the system is 2-inch schedule 40, commercial steel pipe. a. If the flowrate is 15 kg/s, determine the Fanning friction factor in the pipe using the Colebrook Equation. b. At a flowrate of 15 kg/s, the heat exchanger and chiller each have a pressure drop of 15 kPa. Estimate the equivalent length of each heat exchanger. c. In addition to the heat exchangers and 35 m of straight pipe, there are the following valves and fittings: 90° elbows Tee Open gate valve Swing check valve x 6 x2 x6 x1 If the flowrate is 15 kg/s, determine the work required (in kW) for a 75% efficient pump. You may ignore entrance and exit effects.

Consider a pumping system used in a cooling water loop. Water is drawn from a tank, which maintains a height of 2 m of water. It then enters the pump and then passes through the process heat exchanger, where it is heated. The water is then cooled back to cooling water temperature using a chiller (another heat exchanger). Finally, water exits the chiller and is circulated back to the original tank, forming a closed loop. All equipment is at ground level. All pipe in the system is 2-inch schedule 40, commercial steel pipe. a. If the flowrate is 15 kg/s, determine the Fanning friction factor in the pipe using the Colebrook Equation. b. At a flowrate of 15 kg/s, the heat exchanger and chiller each have a pressure drop of 15 kPa. Estimate the equivalent length of each heat exchanger. c. In addition to the heat exchangers and 35 m of straight pipe, there are the following valves and fittings: 90° elbows Tee Open gate valve Swing check valve x 6 x2 x6 x1 If the flowrate is 15 kg/s, determine the work required (in kW) for a 75% efficient pump. You may ignore entrance and exit effects.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter44: Geothermal Heat Pumps

Section: Chapter Questions

Problem 1RQ: Geothermal heat pumps, or water-source heat pumps, are classified as either _____loop or _____loop...

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