A Hybrid Dynamical Modelling and Control Approach for Energy Saving of Central Air Conditioning

Yan, Zhang; Liu, Yongqiang; Liu, Yang

doi:10.1155/2018/6389438

Cited by 8 publications

(8 citation statements)

References 21 publications

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“…In chilled water system, switching and variable frequency behaviors of pumps adjust the flow for saving energy, which denote the discrete and continuous time process, respectively. So we give an equation to show the heat balance as follows [34]:…”

Section: Using In Refrigeration Systemmentioning

confidence: 99%

A Modelling and Control Approach for a Type of Mixed Logical Dynamical System Using in Chilled Water System of Refrigeration System

Yan

Chu

Liu

et al. 2019

Mathematical Problems in Engineering

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The chilled water system of central air conditioning is a typical hybrid system. The dynamic adjustment of cooling capacity based on hybrid system can achieve accurate temperature control and real-time energy saving. Mixed logical dynamical (MLD) systems have advantage for solving constrained optimization problems of this type of case by numerical methods. This paper proposes a novel modified type of MLD system, which enhances the model applicability and improves the switching flexibility and control effect for the framework. In order to meet the needs of cooling capacity and energy saving, the optimal control problem is transformed as MIQP problem by defined performance index. As a numeral example of application, the model and control method is used in pumps group control for variable water volume in chilled water system of central air conditioning. At last, the dynamic and energy-saving effects of the system are simulated, which shows the ideal control results.

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Section: Using In Refrigeration Systemmentioning

confidence: 99%

A Modelling and Control Approach for a Type of Mixed Logical Dynamical System Using in Chilled Water System of Refrigeration System

Yan

Chu

Liu

et al. 2019

Mathematical Problems in Engineering

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“…In the paper "A comfort-Aware Energy Efficient HVAC System based on the Subspace Identification Method", deals with the effective way to decrease the energy required for HVAC system by identifying the subspace [7].…”

Section: Literature Surveymentioning

confidence: 99%

Heat Load Calculation with Duct Design of a Multi Storeyed Residential Building

T¹,

Kiran²,

Reddy³

2019

IJTSRD

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The heating, ventilation, and air conditioning (HVAC) system is arguably the most complex system installed in a building and is responsible for a substantial component of the total building energy use. Maintaining optimal temperature and air circulation are the basis of a comfortable indoor environment[1]. This role is played by HVAC (Heating, ventilation and air conditioning) systems. The heat load calculations along with the duct design for a HVAC system installed in a multistorey residential building is calculated and analyzed to maintain a desired temperature based on outer environmental temperature. The duct design is analyzed which create an impact on system performance. The layout of a multistorey residential building is made by using Autodesk REVIT software. A complete air conditioning system was designed along with ducts and VAV system to control the indoor environment conditions like temperature, relative humidity, air movement, etc. Based on the obtained Heat Load Calculations CFM & T.R values were found for each spaces and ducting design was done for all the spaces by considering the quantity of CFM to be supplied. A suitable air handling unit (AHU) is selected based on the CFM value for multi storey residential building. With this the capacity of equipment was estimated and selected for the installation.

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“…Set the state variable ( ) = ( ) and the input variable ( ) = w ( ), use the variable water volume of water system and the constant air volume of air system transfer modes [3,13], and use the differential equation to describe the system model:(…”

Section: Mathematical Model Of Room Temperature Changes In Air Conditmentioning

confidence: 99%

“…Compared with the rate, an online optimization control strategy is proposed, and the performance improvement is demonstrated through experiments. Zhang Yan et al [13] proposed a kind of central air-conditioning cooling based on hybrid system model. The model of energy saving in the frozen water system, and set the action of the pump group for frequency conversion and switching, and demonstrate the applicability of the model and control strategy through computer simulation; H. Wang et al [14] put various energy saving such as variable flow, temperature difference and differential pressure.…”

Section: Introductionmentioning

confidence: 99%

An Optimal Hybrid Control Method for Energy-Saving of Chilled Water System in Central Air Conditioning

Yan

Chu

Liu

2018

Journal of Control Science and Engineering

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Chilled water system of central air conditioning is a typical hybrid system; variable frequency behavior with amplitude limited of pumps reflects continuous and discrete dynamic characteristics. The way of energy-saving is variable water volume, via variable frequency behavior of pumps to gain adjustment of power consumption. Facing the situation of the variable frequency pumps with parallel operation, single continuous or discrete modeling cannot reflect the hybrid features. Thus, the control method will have some questions, such as bad energy-saving effect, difficult accurate adjustment of cold capacity, and low running energy efficiency. However, hybrid system modeling can reflect hybrid dynamic behavior of pumps, which is combining continuous and discrete features. The questions of nonlinear and multiparameters can be solved by control method based on hybrid system. Here, an optimum control method is proposed with the principle of the minimum, by setting the minimum power consumption as the performance function in fixed time, which realizes variable control of pumps and accurate adjustment of temperature inside room. At last, it shows the system characteristics and energy-saving affection by hybrid system modeling and the optimum control method.

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A Hybrid Dynamical Modelling and Control Approach for Energy Saving of Central Air Conditioning

Cited by 8 publications

References 21 publications

A Modelling and Control Approach for a Type of Mixed Logical Dynamical System Using in Chilled Water System of Refrigeration System

A Modelling and Control Approach for a Type of Mixed Logical Dynamical System Using in Chilled Water System of Refrigeration System

Heat Load Calculation with Duct Design of a Multi Storeyed Residential Building

An Optimal Hybrid Control Method for Energy-Saving of Chilled Water System in Central Air Conditioning

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