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 x6 Tee x 2 Open gate valve x6 Swing check valve x 1 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. d. Determine the pressure increase across the pump. e. If an orifice plate with = 0.5 is used to measure the flowrate, what would the pressure drop across the plate be? f. If the pump is 25 kW, what diameter of pipe should be used?
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 x6 Tee x 2 Open gate valve x6 Swing check valve x 1 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. d. Determine the pressure increase across the pump. e. If an orifice plate with = 0.5 is used to measure the flowrate, what would the pressure drop across the plate be? f. If the pump is 25 kW, what diameter of pipe should be used?
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:1. 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
x 6
x 2
Open gate valve
x 6
Swing check valve
x 1
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.
d.
Determine the pressure increase across the pump.
e. If an orifice plate with = 0.5 is used to measure the flowrate, what would the pressure
drop across the plate be?
f.
If the pump is 25 kW, what diameter of pipe should be used?
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