How to calculate water pressure drop in cooling tower piping system?

AI Thread Summary
To calculate water pressure drop in a cooling tower piping system, the Hazen-Williams equation is typically used for closed circuit chilled water systems. However, for open circuit systems, adjustments may be necessary due to differing conditions like atmospheric pressure at the pump intake and discharge. Factors such as the pump's Net Positive Suction Head (NPSH) and temperature variations in the water must also be considered. The equation's parameters, including the Hazen-Williams roughness constant and hydraulic diameter, remain relevant but may require modification based on specific system characteristics. Understanding these nuances is crucial for accurate pressure drop calculations in cooling tower applications.
HVAC Master
Messages
1
Reaction score
0
TL;DR Summary
calculating water pressure drop in cooling tower piping system
When calculating water pressure drop in chilled water pipisystem (closed circuit) we always use Hazen Williams equation as follow:-
h100ft = 0.2083 x (100 / c)^1.852 x q^1.852 / dh^4.8655
where
h100ft = friction head loss in feet of water per 100 feet of pipe (ft.w/100 ft pipe)
c = Hazen-Williams roughness constant
q = volume flow (gal/min)
dh = inside hydraulic diameter (inches)
but in case of calculating water pressure drop in cooling tower piping system (open circuit), shall we modify something in Hazen Williams equation or shall we use another equation?
 
Engineering news on Phys.org
Please, see:
https://www.engproguides.com/condenser-water-pump-design.html

Pump intake conditions are atmospheric pressure plus water column (consider pump NPSH to avoid cavitation).
At the end of the hydraulic circuit, you have the sprayers discharging at atmospheric pressure.
Consider also changes of temperature of the water through the pipes circuit.
 
Thread 'What type of toilet do I have?'

Thread 'What type of toilet do I have?'

I was enrolled in an online plumbing course at Stratford University. My plumbing textbook lists four types of residential toilets: 1# upflush toilets 2# pressure assisted toilets 3# gravity-fed, rim jet toilets and 4# gravity-fed, siphon-jet toilets. I know my toilet is not an upflush toilet because my toilet is not below the sewage line, and my toilet does not have a grinder and a pump next to it to propel waste upwards. I am about 99% sure that my toilet is not a pressure assisted...
View full post »

Thread 'Thread No-Go plug gage allows 3 turns to enter. That's too many!'

After over 25 years of engineering, designing and analyzing bolted joints, I just learned this little fact. According to ASME B1.2, Gages and Gaging for Unified Inch Screw Threads: "The no-go gage should not pass over more than three complete turns when inserted into the internal thread of the product. " 3 turns seems like way to much. I have some really critical nuts that are of standard geometry (5/8"-11 UNC 3B) and have about 4.5 threads when you account for the chamfers on either...
View full post »
Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Scenario 1 (figure 1) A continuous loop of elastic material is stretched around two metal bars. The top bar is attached to a load cell that reads force. The lower bar can be moved downwards to stretch the elastic material. The lower bar is moved downwards until the two bars are 1190mm apart, stretching the elastic material. The bars are 5mm thick, so the total internal loop length is 1200mm (1190mm + 5mm + 5mm). At this level of stretch, the load cell reads 45N tensile force. Key numbers...
View full post »

Similar threads

When air pressure drops in a pipe due to friction losses, how do you calculate the associated temperature drop?
Replies
8
Views
1K
Force of pressurized water exiting a hose or pipe?
Replies
20
Views
10K
Pressure drop due to holes in a pipeline?
Replies
10
Views
5K
Huge pressure drop after changing pipe length (Don't think it's loss)
Replies
13
Views
4K
Static pressure in a water pipe system
Replies
11
Views
4K
How to calculate a pressure drop in a branch of a loop ring pipe
Replies
6
Views
9K
What is the leakage rate of my underground piping system?
Replies
13
Views
4K
Friction Loss for gravity fed rainwater downspouts/pipes?
Replies
3
Views
2K
Calculate Pressure Drop through Expansion/Reduction for Gas
Replies
1
Views
4K
Calculate Water Leak From Hot Water System - Pipes, Pressure & More
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top