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Aiming at energy saving and consumption reduction, this project applies the technology of combined heating and cooling heat pump to ecological building design. The combined hot and cold system is an integrated control system, which utilizes the solar system and heat pump technology (air source heat pump, water source heat pump) to complement each other based on changes in the outdoor environment, thus providing users with hot water heating and cold water cooling in winter. After installing a new heating and cooling system, coupled with well-equipped automatic control equipment, the heating coal consumption has been significantly reduced, and the emissions of CO2, SO2 dust, and other pollutants have also been correspondingly reduced. Compared with the cold and hot split supply system using electric refrigeration and thermal heating, the winter and summer sharing of the cold and hot combined supply device not only improves energy utilization efficiency, but also saves investment in heat source construction, thereby reducing costs and environmental pollution. [ABSTRACT FROM AUTHOR]

In most industrial processes, it is required to know the dynamics of the process to achieve better adjustment and precision of the controllers; often, obtaining models by solving equations is complex to perform. With the development of technology, data can be obtained in real-time from the process. Identification methods are of great help in obtaining mathematical models experimentally, which is why engineering students must carry out practices in this countryside. A fluid heating-cooling plant is designed and built to have equipment for automatic control and instrumentation practices. The model was obtained from input-output data using parametric identification techniques; tests were carried out with ARX, ARMAX, OE, and BJ models, and the model was selected using similarity percentage, step response, and residual analysis. The best results were obtained with the BJ 22321 model, reaching a similarity percentage of 81.71%, for the model selection, parsimony was also considered, i.e., the one with the lowest number of poles and zeros. For the adjustment of the controller, the IMC-PID tuning was used. The response was tested with different controllers, and the PID-Fuzzy with 25 rules was selected; with this controller, a 10% surplus level percentage and a stabilization time of 200 seconds are obtained. [ABSTRACT FROM AUTHOR]

Aiming at the problems of the low efficiency of manual pesticide application in the greenhouse, the narrow operating space of plant protection machinery, and the possibility of poisoning the pesticide applicators due to the closed space, a high-pressure atomization spraying equipment for the greenhouse was designed. The spraying equipment adopts two-way communication between PLC and HMI to realize the adjustment of atomization pressure and atomization flow, and the control equipment completes automatic spraying. To determine the best working parameters of the spraying equipment, orthogonal tests were conducted with atomization pressure and atomization nozzle aperture as the test factors and the coefficient of variation of the fog volume distribution as the evaluation index. The optimum combination after parameter optimization was determined to be as follows: atomization pressure of 4 MPa, atomization nozzle aperture of 0.4 mm. The test results under the optimal parameters showed that the spray distribution coefficient of variation was 10.5%, and the uniformity of fog volume distribution was good to meet the requirements of spraying in greenhouses. [ABSTRACT FROM AUTHOR]

The ability to detect gun and gun held in hand or other body parts is a typical human skill. The same problem presents an imperative task for computer vision system. Automatic observer independent detection of hand held gun or gun held in the other body part, whether it is visible or concealed, provides enhance security in vulnerable places and initiates appropriate action there. Compare to the automatic object detection systems, automatic detection of gun has very few successful attempts. In the present scope of this paper, we present an extensive survey on automatic detection of gun and define a taxonomy for this particular detection system. We also describe the inherent difficulties related with this problem. In this survey of published papers, we examine different approaches used in state-of-the-art attempts and compare performances of these approaches. Finally, this paper concludes pointing to the possible research gaps in related fields. • Weapon detection boosts automatic surveillance and security system in vulnerable places and reduce dependency on human observer. • We present a comprehensive survey on computer vision methods for weapon detection. • We indicate the challenges regarding weapon detection and also present new-frontier in weapon detection. • We analyze several image features used for weapon detection. • We define a taxonomy based on the state-of-the-art methods for weapon detection. [ABSTRACT FROM AUTHOR]