scholarly journals Experimental Study on a Novel Optimal Differential Pressure Reset Method for Online Application in Chilled Water System

2015 ◽  
Vol 121 ◽  
pp. 714-719
Author(s):  
Tianyi Zhao ◽  
Liangdong Ma ◽  
Jili Zhang
Keyword(s):  
Experimental Study ◽  
Water System ◽  
Differential Pressure ◽  
Online Application ◽  
Chilled Water ◽  
Chilled Water System

Optimal Pump Speed Control in a Chilled Water System

2007 ◽  
Author(s):  
Bin Zheng ◽  
Mingsheng Liu
Keyword(s):  
Water System ◽  
Pump Energy ◽  
Control Valve ◽  
Speed Control ◽  
Differential Pressure ◽  
Pump Efficiency ◽  
Pump Speed ◽  
Chilled Water ◽  
Pump Head ◽  
Chilled Water System

Traditionally, chilled water pump speed is modulated to maintain the water loop differential pressure set point and the control valve at the air handling unit (AHU) is modulated to maintain the supply air temperature. This paper introduces a new VFD pump speed control algorithm, optimal pump head control strategy. The algorithm focuses on minimizing the water loop differential pressure in order to reduce the overall pump energy consumption. The new algorithm is implemented in a real chilled water system. The pump power consumption is compared between the traditional algorithm and new algorithm. The implementing result demonstrates that the new algorithm results in improved pump efficiency, reduced pump head and pump speed and remarkable energy savings.

EXERGOECONOMIC ANALYSIS OF A CHILLED WATER SYSTEM IN A SHOPPING MALL

2020 ◽  
Author(s):  
Renata Portela de Abreu ◽  
Victor Hugo Lobo Correia ◽  
Adriano Marques ◽  
monica carvalho
Keyword(s):  
Water System ◽  
Shopping Mall ◽  
Chilled Water ◽  
Chilled Water System ◽  
Exergoeconomic Analysis

scholarly journals A New Model Predictive Control Method for Eliminating Hydraulic Oscillation and Dynamic Hydraulic Imbalance in a Complex Chilled Water System

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3608
Author(s):  
Yang Yuan ◽  
Neng Zhu ◽  
Haizhu Zhou ◽  
Hai Wang
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Control Method ◽  
Water System ◽  
Energy Performance ◽  
Effective Control ◽  
New Model ◽  
Chilled Water ◽  
Chilled Water System ◽  
Hydraulic Oscillation

To enhance the energy performance of a central air-conditioning system, an effective control method for the chilled water system is always essential. However, it is a real challenge to distribute exact cooling energy to multiple terminal units in different floors via a complex chilled water network. To mitigate hydraulic imbalance in a complex chilled water system, many throttle valves and variable-speed pumps are installed, which are usually regulated by PID-based controllers. Due to the severe hydraulic coupling among the valves and pumps, the hydraulic oscillation phenomena often occur while using those feedback-based controllers. Based on a data-calibrated water distribution model which can accurately predict the hydraulic behaviors of a chilled water system, a new Model Predictive Control (MPC) method is proposed in this study. The proposed method is validated by a real-life chilled water system in a 22-floor hotel. By the proposed method, the valves and pumps can be regulated safely without any hydraulic oscillations. Simultaneously, the hydraulic imbalance among different floors is also eliminated, which can save 23.3% electricity consumption of the pumps.

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