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Chiller Pipe Design

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HACE609

Mechanical
Joined
Jun 6, 2013
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1
Location
US
Hi Everyone,

I am just starting my career in the MEP design world. I was previously involved in research and development. I need advice on two topics:

1) What is the best method for sizing pipe in a chiller system (process chilling)? And what method do you use for sizing pipe in a residential plumbing system?

- Extra info: I already have the chiller sized and a required header of 4" SCH40 PVC. I'm looking at branching off of the header to 5 different lines requiring a total of 25 GPM each with 3 sets (supply/return) of 2" drops on each branch. I'm curious as to how to size the branch. I assume I need to calculate equivalent length and use the chart with pressure loss vs gpm but I'm unsure of how to calculate pressure loss. Can I calculate my start pressure (from pump) from the GPM and head? Thank you for allowing me to ask the easy questions.

2) What references do you suggest as I try and teach myself as much as possible...I'm currently working for a very busy, small MEP design shop so I need to teach myself as much as possible.

Thank you in advance for your help!
 
you should design based on ASHRAE guideline (1-4 ftH2O wg / 100 ft and ~2-4 ft/s).
The ASHRAE fundamentals book will tell you a lot on the details.
 
For a beginner,I would recommend the Carrier Handbook of Air Conditioning System Design over ASHRAE. Once you have got a hang of things you can move onto the AHSRAE guides for more indepth understanding of various topics.
 
Residential plumbing should be dictated by your local building code.
 
One of the best known training programs. Application of B&G products has been a building block in our MEP industry. I can solve 90% of designs issues with a Trane ductulator and a B&G system sizer. Carry both with you. Application of the correct velocity for the type of pipe/application is the key. Welcome to the industry. Steve.
 
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