Start networking and exchanging professional insights

Register now or log in to join your professional community.

Follow

How can calculate AHU or FCU condensate drain Pipe? condensate drain Pipe depend Motor KW or Cooling coil Flow rate?

How can calculate AHU or FCU condensate drain Pipe? condensate drain Pipe depend Motor KW or Cooling coil Flow rate? suppose i have USGPM and KW

user-image
Question added by Muzammil yusuf Jaigadkar , HVAC BIM Modeler / Draftsman , Al Ahlia Integrated General Trading & Contracting Co. WLL
Date Posted: 2017/04/18
Sami AlQasem
by Sami AlQasem , Commissioning Manager , Evolution Engineering Services

IPC chapter 8 table 8-2, Minimum condensate pipe size shows the equipment capacity in Tons or KW and the minimum pipe size you can use. 

 

Mohammed Shebl
by Mohammed Shebl , Contracts Manager , SALFO - Engineering & Management Consultants

this schedule show you how to calcualte the condensate drain

Praveen Sagayaraj
by Praveen Sagayaraj , HVAC Engineer , Advanced Oilfield Technology Company LLC

To find the DESIGN condensate drain, one needs to know the design inlet and outlet air conditions (precisely the moisture content and air flow rate). The difference between inlet and outlet conditions of the moisture content gives the condensate flow rate.

Then based on the standards from ASHRAE /ISHRAE or from Buildings Codes one can easily select the drain pipe sizes per flow requirements as calculated above.

To find the correct U-leg lengths: as a rule the difference in the heights of U-legs should be mm larger than the static pressure of the AHU blower. (Care should be taken here, because it is also dependent on the blower type, draw through or blow through). 

For the second part of the question, flow rate of air across the coil affects the condensate flow rate.

PMP ® Umair Ishaq
by PMP ® Umair Ishaq , Manager MEP , PRIMACO

Is is dependent upon the Static pressure at which Fan/blower for FCU or AHU is designed. It is not related to motor power or otherwise.

Deleted user
by Deleted user

it depends on the unit internal maximum experienced static pressure of the unit AHU/FCU so not to allow air to flow through the condensate pipe to the unit and introduce unwanted FA and also to allow for condensed water to escape.

chetan sharma
by chetan sharma , Senior project engineer , trinity engineering services

Condensate Drain Pipe Sizing kW Connected to the                         Condensate Drain Pipe Condensate Drain Diameter                       (inches) 0-7.0 kW 3/4'' 7-,5 kW 1'' ,5- kW /4'' - kW /2'' - kW 2'' kW 3'' kW 4''

More Questions Like This