chilled water pump head calculation, pump hydraulic calculation (Primary and Secondary),chiller pump
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- Опубліковано 1 чер 2019
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Hello guys. My name is Syed Muhammad Waqas and welcome to my channel MEP Engineering tutorials. On this channel you will find alot of tutorials related to MEP Specifically HVAC field
In this video I am gonna explain you guys how to perform hydraulic calculations in your central chilled water project system to select primary & secondary chilled water pumps. I am gonna take example of one central chilled water project and explain all the calculations using excel sheet in detail to select primary and secondary chilled water pump. Let me explain what is pump head. The pump head or discharge head of a water pump is a measure of the power of a pump. Pump head is measured in meters (or feet)
If you think this video is useful then please like and don't forget to subscribe my channel. Thanks 😊😉
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in my 17 years experience i did not see a video which explaining this much easy and simple, keep it up, very good work, try cover all the calculations, i already subscribed, looking forward more good such staff. thank you.
Thanks a lot bro, I was desperately searching for the video
Amazing, nice explanation. Thank you for sharing your knowledge. GOD Bless you.
You teach very well, sir
Hello there! i have t questions, the material is still available? and the other one is how do you put into account in the calculations a elevation of the pipe, i mean if you have a section of 30 m in height, just add it as mH2O? and just + with the already head calculated? if you need to guarantee a specific pressure at the end of the line for an equipment, for example 3.5 bar, just + the same 3.5 bar as head loss?
Very useful video
Thanks a lot
Thanks a lot, sir very informative, great effort sir, sir please send me this all documents for practice including excel sheet, and please make one tutorial on ESP CALCULATION AND DUCT ALL TYPE AREA CALCULATION SIR THANK A LOT, SIR
Very knowledgeable video SIR
Head loss in chiller and AHU are added in which pump Primary or secondary Sir
if pump system in basement and 11 story building then secondary pump head same calculate or building head is added on total head losses, please sagest me??????????????
Hi syed Mohammad Wakaas hope doing great.
I will appreciate your effort to make a detailed video on ESP calculation of a fan with excel sheet and supporting docs if any.
Thank you !!!
Yeah sure Muhammad I will make video on this topic soon
Anything to be considered for vertical height in terms of head loss?
and what about the static head do we need to take?
Hii sir thanks a lot please do the tutorial on slotted diffuser and linear bar grill selection if possible.
Yeah sure.
Hi Sir. Can you explain in the primary cha head Cal. Where you get the value of 25ft equivalent length of 2 way valve. Thanks
sir. the output HP came as 2.5.
in the start of video in the drawing shown 3 pumps.
so this 2.5 hp will be divided into 3 pumps.
or 3 pumps of 2.5hp to be installed??
Does frictional factor are same for horizontal and vertical pipe
Hi waqas continuously watching your videos it is very informative. Please note that in above calculation from A to I pipe size not constant because chiller discharge header size is 16" and pump suction size 8" and discharge 6". Thank you
I never mentioned in the video about supply header and discharge header size. It could be 16", 14", 12" or whatever depends on total gpm calculated. And obviously pump suction and discharge sizes would be different again depending on gpm and head calculation. Main purpose here is to show the procedure of pump head calculation. And then you have to follow the actual drawing routing for head calculation where you have straight pipes, bends, fittings, headers, special equipments.
MEP Engineering Tutorials I got it thank you
sir. can u please tell. how to select number of secondary pumps , ??
Thank you for the video, what about the friction loss due to the chiller and coil?
Yeah we need to add losses due to water side equipments (like chillers, AHU, FCU) etc...
@@MEPEngineeringTutorials do you add the equipment losses (chillers, ahu, fcu, etc) to each pump calc? Or just primary pump calc? Also....is it every single AHU or just the furthest one away?
@Michel yes we need to equipment losses in primary as well as secondary pump head calculation and as per most remote (furthest) circuit we have to add equipment losses
Nice
Please make a video on, Water Cool Chiller's, CONDENSOR WATER PIPING DESIGN!
Thanks!
Yeah sure I will make a video on this topic soon. My upcoming video will be related to Fan ESP calculation which you requested few weeks ago I was busy so I didn't cover this topic but soon I am gonna upload Fan ESP calculation tutorial.
@@MEPEngineeringTutorials Thanks a lot! 🙂👍
Hi Waqas , i have doubt regarding pump head calculation of primary and secondary . as per my knowledge for primary pump we have to calculate only chiller loop that is pump discharge line to pump suction line of primary pump only... and for secondary pump we have to take discharge line of secondary pump to FCU and then FCU to suction line of secondary pump ...please correct me if am wrong..
Hi,you are using British gpm 480 in pipe sizer software which need us gpm value which is more than British as u used tonx2. 4.
This 480 is calculated US GPM value not British GPM ...
hi, nice video, is it not necessary to also account for pressure drop on the coil? to finish calculation? and what about return line, not needed? thanks
Yes we do need to add coil pressure drop losses across each water side component and for return line you have to do calculation for primary pump
@@MEPEngineeringTutorials hey thanks for your reply. imagine that instead of chiller it is a chill water buffer tank, it gets water to the buffer tank and it goes back to the tank in return line, in this case do we account pressure drop from water tank to coil only or add the return line too? there is another pump that also takes from buffer tank to the PHE and return to water tank too
Hi Bro,, thanks alot for your video,, this is very helpfull,, btw can you share to me for equivalent lenght data as your mention on this video? Thanks
Dear priyawan you have to join channel membership to get access to design data. Click join channel to get access to required data
So the Primary pump should overcome pressure losses of the chiller loop only: from the suction point, through the chillers, to the suction point of the secondary pump. So it will have always less Head than the secondary pump that should handle the pressure losses throughout all the distribution loop ??
Basically primary pump is taking water from buildings and push to chiller and secondary pump is taking water from chiller and push to buildings (supply to AHU's FCU's & other water side components). So primary pump will have to overcome all losses that are coming (from return side of water side components like FCU & AHU) to chiller suction point. And secondary pump will have to overcome all losses that are coming from discharge side of chiller to supply side of water side components.
@@MEPEngineeringTutorials Primary pumps need only provide enough head to move chilled water through the chiller and the piping pressure drops between the chiller and the secondary pumps. Heads in the range of 25 to 75 ft are common. Check this PDF page 52. I look forward to hearing from you. www.dropbox.com/s/31wt8bwovfgiuo2/Chiller_Plant_Design.pdf?dl=0&fbclid=IwAR1qHTx2Yo9Q3ZA8Oz7c5zUUQUgyz4GkRXcE3lozqoXP1IeOEJrLOv7Q62w
Requesting you to make one video on ESP
I will make it soon.
What about the static head ?!!! And what about the impact of the return line ?!!!!
How to select cooling tower
Sir what about the effect of gravity in pump head in both the primary and secondary pump.
I have same dought
Do we need to calculate the head loss of the flexible connection which connects the pipe to the pump?
Yes we have to add flexible connector head loss as well
I have one doubt, as we are calculating pump head loss for both pump so we have to take straight pipe and it's accessories only.
IN AHU there is heating and cooling coil also so we have add AHU loss also? or only supply and return pipe are enough for pump head calculation
You have to add all water side equipment losses like all AHU's, FCU's and chillers
@@MEPEngineeringTutorials so when I will calculate Head loss for secondary pump then I will add AHU Coil loss also,
Same I will add AHU coil loss in primary pump head calculation?
from building to chiller is primary pump,from chiller to building is secondary pump and what about condenser pump.plz make one video on pumps.
which pumps use in air cooled chiller and water cool chiller.
The one I explained in video is for air-cooled chillers. Same process is used for water cooled chiller but you will have one more loop in water cooled chiller system that's is condenser water loop
@@MEPEngineeringTutorials thank u now my doubt is clear
Q. 1- Why did you not count fittings of all secondary pumps in A-I section but only considered only for single pump ?
Q-2: You calculated HP of secondary pump which is 2.71. So this HP=2.71 of secondary pump is for each secondary pump?
Q-3 There is 3-Chillers in drawing but you have selected single chiller. Common header of each chiller have large gpm and large size 16" dia. Why this is not considered over here?
Plz somebody clear all three doubts?
Dear Sir, i have doubt that some of the other chilled water pump tutorials, for primary pumps they are taking only the suction header to chiller, and for secondary, they are taking whole pipe length in the building, instead of in your calculation{ for primary you are taking all the supply line from building to chiller and for secondary from chiller to all unit}..which methode is more fesible?
For primary CHW pump head calculation you have to consider all the piping (of fcu, Ahu and other water side equipment) running from buildings to your chiller and for secondary CHW pump head calculation you have to consider all the piping (of fcu, Ahu and other water side equipment) from chiller to buildings. This is the correct method to determine CHW pump head.
@@MEPEngineeringTutorials thanks!!!can u send me the fittings press loss catalogue? babugd@gmail.com
Generally what you say might be right but do you have any reference from codes for this allocation of circuit for your head calculation. Many references say that primary pumps should be sized for only the primary circuit across the decoupler and secondary pump on the secondary circuit
Can you share the drawing files and excel sheets which you are explained in this video
Dear vemula kindly join channel membership to get access to Excel sheet, drawings and other docs. Channel membership link is given in the video description. Thanks
Primary may be substitute 85 place 66
Zalima sa okhra awaz di nishta, mri
Sir in primary pump calculation you mentioned only LK ,kj , Ji why you not mentioned I to A
Can you provide this drawing please
NEXT TIME PLEASE PUT THE CHARTS DOWNLOAD LINK IN UR DESCRIPTION TO HELP NEW ENGINEERS.
I just added download link in the description below. Now you can download it from there.
@@MEPEngineeringTutorials Thank you
Assalam alaikum
Dear waqas,
I interested in this videos
Walikumsalam
Esp calculation need.
Yeah sure I will make one video on this topic
Hey my dear .
Primary pump taking water from tunents and discharge to chiller.
Secondary pump taking water from chiller and discharge to tunents.
Then who take water from cooling tower and discharge in to chiller ???
Explain it please
I have explained this example with reference to air cooled chillers. You are talking about water cooled chillers that's is another loop of condenser pump and cooling tower.
What a nice way to represent the theory..grt job sir..👏👏👏
Sir can you please send me the pdf of primary pump and secondary pump view to see the various valve.. thanks in advance.