The stable operation of the central air conditioning water system always is a major difficulty for the control profession. Paper focus on the water system with multi variable, strong coupling, nonlinear, large time de...The stable operation of the central air conditioning water system always is a major difficulty for the control profession. Paper focus on the water system with multi variable, strong coupling, nonlinear, large time delay characteristics, presented use feed forward coupling compensation method, to eliminate the coupling effect between temperature and pressure. In this paper, the Elman neural network controller is designed for the first time, and the simulation results show that the response time of Elman neural network controller is shorter, the system is more stable and the overshoot is small.展开更多
A structure of central air conditioning system in building and its running pattern are proposed in order to perform optimum energy saving strategy. The design of room temperature controller is taken as an example to d...A structure of central air conditioning system in building and its running pattern are proposed in order to perform optimum energy saving strategy. The design of room temperature controller is taken as an example to discuss the design of fuzzy controller using common microprogrammed control unit (MCU) in detail. Based on fuzzy theory the query control tables fixed in read only memory (ROM) of MCU are established to realize the energy saving in the room temperature controller and the reasoning procedure is analyzed. The diagram of hardware design and the flow chart of software of room temperature controller are presented. The results show that the proposed method is practical and effective to achieve the energy saving goal.展开更多
An energy-saving control strategy based on predictive control for central air-conditioning systems is proposed in this paper. The cold load model is developed to describe the dynamic characteristics of temperature con...An energy-saving control strategy based on predictive control for central air-conditioning systems is proposed in this paper. The cold load model is developed to describe the dynamic characteristics of temperature control systems, and then parameters in the cold load model and in the central air-conditioning system model are estimated. Generalized predictive control (GPC) is used to establish an optimization model to minimize the consumption of energy and the control error of temperature. The simulated annealing (SA) algorithm, combined with quadratic programming, is adopted to solve the optimal problem. Contrasted with the simulation of traditional PID control, the results prove the effectiveness of this proposed strategy.展开更多
近期研究发现,优化医院净化空调系统对提高医院的传染病防控能力起到了关键作用。为向新阶段医院净化空调系统的平疫结合设计提供参考,文章采用文献研究法、模拟法对A医院的净化空调系统改造情况进行分析。以对洁净度要求较高的重症监护...近期研究发现,优化医院净化空调系统对提高医院的传染病防控能力起到了关键作用。为向新阶段医院净化空调系统的平疫结合设计提供参考,文章采用文献研究法、模拟法对A医院的净化空调系统改造情况进行分析。以对洁净度要求较高的重症监护室(intensive care unit,ICU)为例,分析该区域净化空调系统在气流组织的平疫结合设计、空气处理措施及配套自动控制系统等方面的优化情况。利用广联达GQI软件建立优化系统的三维模型。研究结果能够为今后需要对净化空调系统进行平疫结合改造的医院提供有益参考,有助于提高医院对传染病的防控能力。展开更多
文摘The stable operation of the central air conditioning water system always is a major difficulty for the control profession. Paper focus on the water system with multi variable, strong coupling, nonlinear, large time delay characteristics, presented use feed forward coupling compensation method, to eliminate the coupling effect between temperature and pressure. In this paper, the Elman neural network controller is designed for the first time, and the simulation results show that the response time of Elman neural network controller is shorter, the system is more stable and the overshoot is small.
文摘A structure of central air conditioning system in building and its running pattern are proposed in order to perform optimum energy saving strategy. The design of room temperature controller is taken as an example to discuss the design of fuzzy controller using common microprogrammed control unit (MCU) in detail. Based on fuzzy theory the query control tables fixed in read only memory (ROM) of MCU are established to realize the energy saving in the room temperature controller and the reasoning procedure is analyzed. The diagram of hardware design and the flow chart of software of room temperature controller are presented. The results show that the proposed method is practical and effective to achieve the energy saving goal.
文摘An energy-saving control strategy based on predictive control for central air-conditioning systems is proposed in this paper. The cold load model is developed to describe the dynamic characteristics of temperature control systems, and then parameters in the cold load model and in the central air-conditioning system model are estimated. Generalized predictive control (GPC) is used to establish an optimization model to minimize the consumption of energy and the control error of temperature. The simulated annealing (SA) algorithm, combined with quadratic programming, is adopted to solve the optimal problem. Contrasted with the simulation of traditional PID control, the results prove the effectiveness of this proposed strategy.
文摘近期研究发现,优化医院净化空调系统对提高医院的传染病防控能力起到了关键作用。为向新阶段医院净化空调系统的平疫结合设计提供参考,文章采用文献研究法、模拟法对A医院的净化空调系统改造情况进行分析。以对洁净度要求较高的重症监护室(intensive care unit,ICU)为例,分析该区域净化空调系统在气流组织的平疫结合设计、空气处理措施及配套自动控制系统等方面的优化情况。利用广联达GQI软件建立优化系统的三维模型。研究结果能够为今后需要对净化空调系统进行平疫结合改造的医院提供有益参考,有助于提高医院对传染病的防控能力。