External Static Pressure (ESP) Calculation by ASHRAE handbook method. (ENGLISH)
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- Опубликовано: 7 май 2020
- Simple and Easiest method
Free download ESP Calculation excel sheet and ASHRAE fitting losses handbook.
passionatengineer.blogspot.co... 
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while coming diverging and converging flow there are two coefficients are there (Cs, Cb) which we have to consider? could you please example.. thank you sir
PERFECT GREATE REALLY APPRECIATED AND THANK YOU
hi, how dou you find your 350 value from the radius of the duck? how is this calculated
Can you share how to calculate the friction coefficient for transition piece
nice.. Thank you so much....sir
thanks for sharing friction loss for ducting system.
Sir I am not able to download the excel sheet , can you plz send the link to download
how to calculate n value for transition piece
Hi . Can u tell me plenum box ESP calculation
can u explain the red color values also
Hi Mr. If there are VD on straight duct on second floor and on take off branch duct drop down first floor, are the VDs calculated in ESP system? Thanks
All fittings should be considered in While calculating ESP
Where did you get the equations for the spreadsheet? I recognize some of the equations but it looks like they have been modified or stuff has been added to them.
Ashrae
GREAT, excellent. i got you. i need one help from you. can you provide link of weather data, i need weather data of different cities of pakistan, especially lahore.thanks
Ur voice in very nice so sweet accent
Thanks sir, make more videos and share file, heat load calculation, pump select, pump curve, head calculation, grill selection, Pipe sizing,
Dear sir, in your excel sheet, you put straight duct fitting coefficient 0.08, do u believe there should be fitting coefficient for straight duct, if yes where is it in ashrae. please reply my question.thanks
drive.google.com/file/d/1FPBKJfoZfMQsxrvtPj7wRx3IZj09XtQm/view?usp=drivesdk
Check page 23&24
Excellent explanation sir..please make a tutorial on Hvac ,plumbing, fire fighting estimation....thanks
You are welcome
Sure next time.
sir why u have taken the special equipment loss factor of volume damper 0.5, filter 0.4,supply diffuser 0.15
where we can find that in handbook
i want fire damper special equipment loss factor
please guide me
Most of them are in ASHRAE handbook, but for filters and special equipments you can ask manufacturers, or can take these from manufacturer catalogs or manuals.
i have found it thanks
Sir can u plz tell how ppl are directly taking 150 mm wg static pressure internal and external including what is that thum role
You can use 0.1 wg per 100 feet of duct.
Have you got a SI version of your sheet? Great video as well!
No, but you can add conversion factors in sheet to convert it in to SI units.
Thanks
Thank you sir
how to calculate -15 pascal pressure for bsl 2 or 3 laboratory?.
I will make video on this soon
sorry to bother you today, whenever i want to save file, message is read only, can you advise.thanks
When you start the excel sheet just click no to read only.
i believe we can calculate duct fitting losses by ASHRAE fitting data base programme,
Yes you can use this, its also available for ios.
Hello, suppose A/c located on rooftop or Basement i want supply the air to ground floor,here in this case what are all factors has to considered?? Elevation difference??
You have to consider all fittings losses, duct losses, accessories losses etc.
@@passionateengineer04 Appreciate your reply message, Thanks,Noted your message,I've read one article suppose the unit located on Roof and air supply to the ground, in this case Thermal gravity effect has also to be taken to account=(density of air*gravity*height (downward flow, upward flow)) and expecting your reply,Thanks
Yes the gravit effect the air flow, but it depends whether you are using single blower for supply and return or you are using separate blower for supply and return air.
The air near ground is denser and at greater pressure, for better calculations you can consider this, and it will effect the ESP also.
@@passionateengineer04 Thanks brother,one small request when you having the free time make one video in this topic, I searched RUclips,there is no videos in this topic(elevation difference).Thank you appreciate it🤝
how to determine the radius of duct..on your example you consider it 350
You can calculate it from drawing or you can take 3/4 of width, depending on design.
Thanks for this valuable information .
Can you please tell me how to find fitting lengths.
You can either use equivalent lengths available in tables, like elbow equivalent length etc and you can use that ASHRAE in which they mentioned the dimensions examples.
how do you do the red section?
If you have any confusion with this use ASHRAE fitting database, check our video.
Thanks
Hi Man, my understand that Static pressure = Total pressure loss- Dynamic pressure of Fan, that is correct? Thanks!
External static pressure is the pressure that overcome the losses of duct, fan etc.
Total ESP= suction+discharge pressure
how can i find out reducer loss in esp
Check the ASHRAE fitting loss chapter
Hi Sir,how to calculate pressure drop for plenum box?
Consider plenum box as duct and calculate it using ASHRAE duct fitting database or as per standard the fcu plenum velocity is 500 fpm, put 500 fpm and cfm in duct sizer you will get the pressure drop.
Get video.... Can you please cover the topic how to read curve line such as static pressure etc!!
We will cover this in some other videos
@@passionateengineer04 thnx in advance... Subscribed also 😊
Hi There,
Thank you very much for the excellent work and insight. What is the password for the excel spreadsheet on the download link?
Thanks.
Password is mentioned above link in website
Sir could you share the excel sheet and pdf as well?
Link is in discription.
Thanks
Hi there sir. Can you please elaborate how did you took radius as 350 in the start??
Radius is calculated from AutoCAD drawing. It depends on elbow radius whether its long elbow or short.
sir how we calculate Y fitting pressure lose
Please check ASHRAE fitting data base video in my channel.
How to calculate airflow. Example 600x400 Elbow ?
Q=v x a
Nice video sir...for room positive pressure like 15 pa..do i add more 15 pa with the calculated ESP.
NO ESP is the pressure that overcome losses of duct, for room pressure you have to play with FA,RA,SA.
@@passionateengineer04 thanks..i have one AHU with 3000 cfm and velocity 1600 fpm..and i want to design duct by using velocity method..and i will use the duct velocity 800 fpm..so can i do it where machine is 1600fpm..is it possible to get desired velocity from this machine..
Yes its possible to get the 800 fpm velocity in duct, if machine have different one
But it will increase the duct pressure.
@@passionateengineer04 thanks..i think it is better to design the duct with respect to AHU discharge fpm.right..? initially we dont get that manufacturer data first. before that we complete total design. In that time what i will consider..?
EXCEL FILE IS NOT OPENING ,PLEASE ANYONE SHARE THAT.
Please share you email, i will send another one
in this which value u take as H and W
while we design duct we always try to reduce the height of the duct,in that case your H=400 and W=600 the answas is 0.66
that means the cp is 0.48
please verify this
please verify the H and W
Ok let me check, but its just an example, kindly just follow the method define by ASHRAE.
Thanks
i did not find password of excel sheet, please anyone can help
password 1234
@@anasmlehat3688 thanks buddy
Please upload next video
Topic
Topic: Last in this video ...You mentioned ESP in static pressure calculator
@@passionateengineer04 Could you tell me how to calculate Pressure drop for Sound attenuators?
Plase send the password for sheet
Its mentioned above the link
Coz u missed the same in the above video
share your email please?
In your case 600 is width and height is 400. H/w means 400/600 right how come it is 600/400
Divided greater by lower value.
If w/h if w is greater
h/w if h is greater.
What is the password of excel sheet?
Mentioned above the link in blog post.
Not detailed explanation