Optimal control of chilled water systems based on collaboration of the equipment's near-optimal performance maps

2021 ◽  
Vol 46 ◽  
pp. 101236
Author(s):  
Wantao Shi ◽  
Jiangqing Wang ◽  
Yuan Lyu ◽  
Xinqiao Jin ◽  
Zhimin Du
Keyword(s):  
Optimal Control ◽  
Water Systems ◽  
Optimal Performance ◽  
Chilled Water

A Novel Nonlinear Modeling and Dynamic Analysis of Solenoid Actuated Butterfly Valves Coupled in Series

2014 ◽  
Vol 137 (1) ◽  
Author(s):  
Peiman Naseradinmousavi
Keyword(s):  
Dynamic Analysis ◽  
Complex Network ◽  
Nonlinear Modeling ◽  
Water Systems ◽  
Magnetomotive Force ◽  
Periodic Noise ◽  
Chilled Water ◽  
In Series ◽  
The U.S

In this paper, we focus on a novel nonlinear modeling and dynamic analysis of the actuated butterfly valves coupled in series. The actuated valves used in the chilled water systems of the U.S. Navy and commercial ships, namely, “smart valves,” recently have received much attention when many of them are operating in a complex network. The network regulates the pressure of the pipeline, while several nonlinear torques/forces including the hydrodynamic and bearing torques and the magnetomotive force affect the performance of each set individually and subsequently the whole system via the couplings among the valves. The contribution of this work is to model such couplings in the presence of the nonlinearities and an applied periodic noise and then carry out dynamic analysis of the valves. We examine the model developed with/without actuation by applying a periodic noise on the upstream valve to capture the couplings among the parameters of both the actuators and valves. This would help us predict the behavior of a particular valve in the network subject to motions of other valves.

Research on systematic optimization methods for chilled water systems in a high-rise office building

2020 ◽  
Vol 209 ◽  
pp. 109695
Author(s):  
Jiewen Deng ◽  
Shi He ◽  
Qingpeng Wei ◽  
Mei Liang ◽  
Zhigang Hao ◽  
...  
Keyword(s):  
Optimization Methods ◽  
Water Systems ◽  
Office Building ◽  
High Rise ◽  
Systematic Optimization ◽  
Chilled Water

A Comfort Oriented Control Strategy for Semi-Active Suspensions Based on Half Car Model

2010 ◽  
Author(s):  
Cristiano Spelta ◽  
Diego Delvecchio ◽  
Sergio M. Savaresi
Keyword(s):  
Optimal Control ◽  
Control Strategy ◽  
Optimal Performance ◽  
Optimal Control Strategy ◽  
Active Suspensions ◽  
Quarter Car Model ◽  
Car Model ◽  
Control Goal ◽  
Quarter Car ◽  
Effective Description

This paper is devoted to the design of a novel semi-active comfort-oriented control strategy based on the “half-car” modeling of the vehicle. The half car model is an effective description of the vertical behaviors in a vehicle like a motorcycle, since it is able to represent both the heave and pitch dynamics. A recent control strategy (the “Mix-1-Sensor”) have been proven to be the quasi-optimal control strategy when the system is described with a quarter car model and the comfort objective is the control goal. This paper presents an analysis of the performances of the Mix-1-Sensor implemented in a half car: this strategy is able to guarantee a quasi optimal performance in terms of heave dynamics but it is not able to manage the pitch dynamics efficiently. A pitch-oriented extension of this strategy is proposed in order to guarantee a better filtering of the pitch dynamics.

Demonstration of an Energy Meter Using a Pump Flow Station

2008 ◽  
Author(s):  
Gang Wang ◽  
Mingsheng Liu ◽  
David Claridge
Keyword(s):  
Energy Consumption ◽  
Water Flow ◽  
Water Systems ◽  
Hot Water ◽  
Motor Power ◽  
Pump Performance ◽  
Pump Flow ◽  
Energy Meter ◽  
Chilled Water ◽  
Pump Head

Heating and cooling energy consumption measurements are critical for operations, controls, and fault detection and diagnosis of heating, ventilation and air conditioning (HVAC) systems. Generally water flow has to be measured in order to determine energy consumption in either chilled water systems or hot water systems. Economical and accurate water flow measurements are essential to develop energy meters. Since pump performance relates actual pump water flow to pump head and power, theoretically water flow through a pump can be determined by other pump performance characteristics, such as pump head and motor power. This paper presents the theoretical model of pump flow stations based on pump head and motor power, and the experiments and results of a cooling energy meter using a pump flow station developed on the chilled water system at a facility.

Development of the Chilled Water System Analysis Tool for Assessing Energy Conservation Opportunities

2013 ◽  
Author(s):  
Ghanshyam Gaudani ◽  
Alex Quintal ◽  
Dragoljub Kosanovic
Keyword(s):  
Energy Consumption ◽  
Cost Reduction ◽  
Air Conditioning ◽  
System Analysis ◽  
Water System ◽  
Water Systems ◽  
Analysis Tool ◽  
Chilled Water ◽  
System Energy ◽  
Chilled Water System

Chilled water systems constitute a major portion of energy consumption in air conditioning systems of the large buildings and process cooling of the manufacturing plants. These systems do not operate optimally in most of the cases because of the operating parameters set and/or the components used. The Chilled water system analysis tool software (CWSAT) is developed as a primary screening tool for energy evaluation. This tool quantifies the energy usage of the various chilled water systems and typical measures that can be applied to these systems to conserve energy. The tool requires minimum number of inputs to analyze the component-wise energy consumption and incurred overall cost. Both air-cooled and water-cooled systems can be analyzed with this tool; however, this paper focuses on water-cooled systems. The tool uses weather data of the chilled water system location and loading schedules to calculate the chilled water system energy consumption. The Air-Conditioning and Refrigeration Institute (ARI) standard 550/590 typical loading schedule is also incorporated for the chiller(s) loading. The tool is capable of comparing economics by analyzing the energy consumption and relevant cost of the existing system and the new system with cost reduction opportunities considered like: (1) increase chilled water temperature set point, (2) lowering the condenser cooing water supply temperature set point, (3) replace chiller(s), (4) Apply variable speed control to chilled and/or condenser water pumps, (5) upgrade cooling tower fan speed control, (6) Use free cooling when possible for water-cooled systems. The savings can be calculated separately for each cost reduction opportunity or can be combined. The economics comparison can be a primary decision criterion for further detailed engineering and cost analysis related with system changes. The comparison between actual system energy consumption and CWSAT results are also shown.

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