Question-and-Answer Resource for the Building Energy Modeling Community
Get s tarted with the Help page
Ask Your Question
2

How to simulate makeup water water consumption on cooling tower

asked 2018-10-31 22:34:36 -0500

pedropellegrino gravatar image

updated 2018-11-01 09:29:06 -0500

Hello, I would like to know if there is any way to simulate the total flow of makeup water necessary on a cooling tower due to the three main types of losses. The inputs would vary as the wet bulb temperature and air flow speeds. Thanks!

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted
3

answered 2018-11-01 08:59:30 -0500

The cooling tower objects have inputs for water evaporation, drift and blow down. See example file CoolingTower:SingleSpeed:MultiCell. See the Engineering Reference for equations used to calculate water usage.

Near the end of the cooling tower inputs are these fields:

CoolingTower:SingleSpeed,
  SaturatedExit,           !- Evaporation Loss Mode
  ,                        !- Evaporation Loss Factor {percent/K}
  0.0080,                  !- Drift Loss Percent {percent}
  ConcentrationRatio,      !- Blowdown Calculation Mode
  3.0000,                  !- Blowdown Concentration Ratio
  ,                        !- Blowdown Makeup Water Usage Schedule Name

When you run the simulation you should see these report variables in the rdd file:

Output:Variable,*,Cooling Tower Make Up Water Volume Flow Rate,hourly; !- HVAC Average [m3/s]
Output:Variable,*,Cooling Tower Make Up Water Volume,hourly; !- HVAC Sum [m3]
Output:Variable,*,Cooling Tower Make Up Mains Water Volume,hourly; !- HVAC Sum [m3]
Output:Variable,*,Cooling Tower Water Evaporation Volume Flow Rate,hourly; !- HVAC Average [m3/s]
Output:Variable,*,Cooling Tower Water Evaporation Volume,hourly; !- HVAC Sum [m3]
Output:Variable,*,Cooling Tower Water Drift Volume Flow Rate,hourly; !- HVAC Average [m3/s]
Output:Variable,*,Cooling Tower Water Drift Volume,hourly; !- HVAC Sum [m3]
Output:Variable,*,Cooling Tower Water Blowdown Volume Flow Rate,hourly; !- HVAC Average [m3/s]
Output:Variable,*,Cooling Tower Water Blowdown Volume,hourly; !- HVAC Sum [m3]
edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

 

Question Tools

Stats

Asked: 2018-10-31 22:34:36 -0500

Seen: 109 times

Last updated: Nov 01 '18