Investigation of Different Cooling Tower Fan Control Strategies Using Actual Chiller Cop and Calibrated Cooling Tower and Fan Models

37 Pages Posted: 29 Jul 2022

See all articles by Gang Wang

Gang Wang

University of Miami

Saeed Ghoddousi

University of Miami

Li Ding

University of Miami

Li Song

University of Oklahoma - School of Aerospace and Mechanical Engineering

Abstract

Open-loop fan speed control and closed-loop approach temperature control of cooling towers were recommended by different researchers. Since coefficient of performance (COP) of chillers impacts the total power of condensing water systems and has been significantly improved over 30 years, the paper is to reinvestigate different cooling tower fan control strategies using actual chiller COP. First a total power model of condensing water systems is developed to obtain the optimal fan speed, leaving water temperature and approach temperature of cooling towers. Then a studied condensing water system is selected and calibrated. Finally, the developed model is applied on the studied system using actual chiller COP and calibrated models of cooling towers and fans. The correlation of these optimal values with the chiller load and ambient air wet bulb temperature and the sensitivity of the total system power to these optimal parameters are evaluated to investigate the performance of different cooling tower fan control strategies. Since the optimal fan speed is only impacted by the chiller load and the total system power is not very sensitive to the fan speed near the optimal speed, the open-loop fan speed control can achieve the best control and energy performance and is recommended.

Keywords: Cooling Towers, Fan speed control, Approach Temperature control, Leaving Water temperature control

Suggested Citation

Wang, Gang and Ghoddousi, Saeed and Ding, Li and Song, Li, Investigation of Different Cooling Tower Fan Control Strategies Using Actual Chiller Cop and Calibrated Cooling Tower and Fan Models. Available at SSRN: https://ssrn.com/abstract=4176432

Gang Wang (Contact Author)

University of Miami ( email )

Saeed Ghoddousi

University of Miami ( email )

Coral Gables, FL 33124
United States

Li Ding

University of Miami ( email )

Coral Gables, FL 33124
United States

Li Song

University of Oklahoma - School of Aerospace and Mechanical Engineering ( email )

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