scholarly journals A Data-Driven Identification Procedure for HVAC Processes with Laboratory and Real-World Validation

Processes ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 83
Peter Minarčík ◽  
Hynek Procházka ◽  
Martin Gulan

Linear system identification is a well-known methodology for building mathematical models of dynamic systems from observed input–output data. It also represents an essential tool for model-based control design, adaptive control and other advanced control techniques. Use of linear identification is, however, often limited to academic environment and to research facilities equipped with scientific computing platforms and highly qualified staff. Common industrial or building control system technology rarely uses these advanced design techniques. The main obstacle is typically lack of experience with their practical implementation. In this article, a procedure is proposed, implemented, and tested, that brings the benefits of linear identification into broader control system practice. The open-source DCU control system platform with its advanced control framework is used for implementation of the proposed linear identification procedure. The procedure is experimentally tested in the laboratory setting using a unique model of HVAC system as well as in real-world environment in an experimental two storey family house. Testing this novel feature of the control system has proved satisfactory results, while some of them are presented in graphical and numerical form.

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 538
Nicoleta Cristina Gaitan ◽  
Ioan Ungurean

The development of the smart building concept and building automation field is based on the exponential evolution of monitoring and control technologies. Residents of the smart building must interact with the monitoring and control system. A widely used method is specific applications executed on smartphones, tablets, and PCs with Bluetooth connection to the building control system. At this time, smartphones are increasingly used in everyday life for payments, reading newspapers, monitoring activity, and interacting with smart homes. The devices used to build the control system are interconnected through a specific network, one of the most widespread being the Building Automation and Control Network (BACnet) network. Here, we propose the use of the BACnet Application Layer over Bluetooth. We present a proposal of a concept and a practical implementation that can be used to test and validate the operation of the BACnet Application Layer over Bluetooth.

2015 ◽  
Vol 9 (2) ◽  
pp. 217-229
Elya Umi Hanik

This article discusses about the Contextual Teaching and Learning (CTL) as an innovation of learning science in elementary schools. In fact, the practical implementation of learning is still focused on the teacher as the main actor in which instruction is the dominant strategy in the learning process. Basically CTL is a concept of learning that helps educators link between what is taught with real-world situations of students and encourages them to make connections between the knowledge possessed and implemented in their lives. The concept of CTL applied in science teaching course could have implications, especially in learning to understand the natural phenomena that are not only conceptual. In consequence, students can receive full knowledge built through real experiences.

1970 ◽  
D. A. Prue ◽  
T. L. Soule

The next generation of free-turbine engines in the 2 to 5-lb/sec airflow class will undergo vast improvements in performance and efficiency. The improvements will be achieved concurrent with overall reductions in size and weight. Effort is required at optimization and miniaturization of the engine control system to keep pace with these improvements. This paper describes a conceptual design of an advanced engine control system for this class of engine. It provides gas generator and power turbine control with torque, temperature, load sharing and overspeed limiting functions. The control system was concepted to accommodate, with minimum hardware changes, such variants as regenerative cycle and/or variable power turbine geometry. In addition, considerations for closed and open loop modes of control and fluidic, electronic and hydromechanical technologies were studied to best meet a defined specification and a weighted set of evaluation criteria.

2018 ◽  
Miroslaw Kondratiuk ◽  
Leszek Ambroziak ◽  
Ewa Pawluszewicz ◽  
Justyna Janczak

Samuel Davies ◽  
Sivagunalan Sivanathan ◽  
Ewen Constant ◽  
Kary Thanapalan

AbstractThis paper describes the design of an advanced solar tracking system development that can be deployed for a range of applications. The work focused on the design and implementation of an advanced solar tracking system that follow the trajectory of the sun’s path to maximise the power capacity generated by the solar panel. The design concept focussed on reliability, cost effectiveness, and scalability. System performance is of course a key issue and is at the heart of influencing the hardware, software and mechanical design. The result ensured a better system performance achieved. Stability issues were also addressed, in relation to optimisation and reliability. The paper details the physical tracker device developed as a prototype, as well as the proposed advanced control system for optimising the tracking.

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