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Based on climate of Chongqing, using DeST-h software, this article simulated air conditioning load in winter and summer and indoor natural temperature in transitional seasons of a Chongqing model building with different external walls and windows, obtained that when the thickness of insulation layer is 30 mm or the self-thermal insulation is ceramic concrete wall or ash foam concrete wall, the effect...
A half-year field study of the thermal environment in rural houses in Western Sichuan Province was conducted from Jan. 2009 to Aug. 2009. In this recent study the Predicted Mean Vote (PMV) is justified to be improper to some free-running buildings until some necessary revision is made. What's more, the study indicates that the distinctive deviation between the PMV and Thermal Sensation Vote (TSV)...
Aiming at complexity, fuzziness and cognition limitation on selection of air conditioning cold/heat source, using for reference triangle fuzzy number computation mentality, a multi-attribute group decision making model based on GIOWA is proposed to use. Through applying in the selection of air conditioning cold/heat source, research results indicates that it may solve effectively multi-attribute decision...
Aiming the complexity, ambiguity and uncertainty of the Optimization of cold/heat sources for air-conditioning system, the paper presents a optimization model, which is based on maximizing deviations associated with the gray-coupled. Model is based on program evaluation index values of various properties under the objective difference between the empowerment, the decision-making for program optimization...
We discuss the dynamical simulation model of the thermal environment for automobile passenger compartments which is useful for the development of automobile air-conditioning systems. In our previous research, we proposed the model of this type considering the accuracy and the amount of computation, however, proposed model was insufficient to simulate the effect of thermal radiation and insolation...
The installation of renewable energy sources based generators such as photovoltaic cells and wind turbines require energy storage systems(ESSs) to control power fluctuation. ESSs, however, are quite expensive. In order to reduce the necessary capacity of ESSs for microgrid applications, the control of heat pumps is researched. In this research, basic characteristic of a heat pump's power consumption...
There are array of evidences to suggest that changes in climate are taking place globally with varying degrees of impacts. Climate change triggered by global warming is expected to have widespread consequences and subsequent usage and overloading of conventional energy resources. These effects will have major impacts on ecosystems, health, water resources and key economic sectors. Most of the vernacular...
The wavelet neural network has already been widely applied to the fields of signal processing and industrial detection etc. Proportion-integration-differentiation(PID) arithmetic is very common in industrial control. it can greatly improve the efficiency of economy if they are integrated. the PID control arithmetic based on the wavelet neural network is proposed to apply to the economy air condition...
This paper considers the current domestic and international air-conditioning control and temperature characteristics of the respective physical parameters of large inertia and time delay of the characteristics of central air conditioning system on thermal engineering modeling, and the establishment of air-conditioned room and a temperature control valve circuit mathematical model. The Matlab simulation...
Comprehensive evaluation based on unascertainty measure in equipment operation has guiding significance. The unascertainty theory model was briefly introduced. This comprehensive method is able to help us select optimized scheme which was obtained by analyzing and handling experimental data. In the evaluation system, such parameters chosen as air temperature, power, the amount of heat recovery, supplying...
This article has established FDES automata model for central air conditioning (AC) system and has studied FDES automata combination method based on average tensor, hereby applying it to the AC control system, obtaining control parameters and giving the control stategy based on FDES.
Air-conditioning system is an important component of the building equipment, but also a large energy consumption item of building. The accurate and timely air-conditioning fault diagnosis will guarantee the stable operation of the air-conditioning, which fulfils key functions in construction energy conservation, but now the bottleneck of fault diagnosis technology of air-conditioning is lack of fault...
Apache Hadoop is a framework for managing large scale storage based datacenters whose primary job is to deliver data to clients. In such systems, the primary job is to associate each data request to a specific data replica among many available replicas. This assignment impacts the workload and power distribution across the storage servers. In this paper, we explore thermal and power aware task scheduling...
The air-conditioning equipment and other structures attached to railway rolling stock are plate objects joined by a spot or an intermittent welding. The finite element (FE) modeling of such plate objects is very time-consuming due to the large number of spot and intermittent welds that must be modeled. We developed automatic weld modeling technology, with the aim of reducing the procedures for FE...
A new energy-saving type of air-conditioning named large and small zone ventilation for loom workshop is proposed and researched by four factors and three levels method in authors' preliminary work. There are four factors which effect greatest large and small zone ventilation and are concerned by most designer and operators. Combined with engineering practice, each factor of this new energy-saving...
Advancement of Energy Management Systems (EMSs) for building facilities is becoming more important for sustainable development. The Service Oriented Architecture (SOA) will be a powerful approach for these systems. Distributed type building air-conditioners, which are dominant in Japan, have many distributed raw state variables required by an EMS. This makes it difficult to apply the SOA to those...
The performance of thermoelectric device can be greatly improved by combining with thermosyphons heat transfer and energy recovering. A novel thermoelectric air-conditioner was developed for a track cab; it is compatible with movable spaces because of its special advantages, such as reliability, eco-friendship and simplicity. Air distribution and comfort may be improved by airstream from up-front...
Natural ventilation is the most effective to reduce the energy consumption of air conditioning for residential building in Guangzhou with subtropical climate. But the effect of natural ventilation on energy saving couldn't be evaluated quantitatively at present. In this paper, an analysis method to evaluate quantitatively the energy saving potential of natural ventilation was proposed. Firstly, the...
Temperature control in Variable Air Volume (VAV) air conditioning systems is a complicated process. Either the traditional Proportional Integral Derivative (PID) controller or the Fuzzy Logic Controller (FLC) is hard to get better control performance. The combination control system with fuzzy control and PID control can improve the control performance. Based on the conventional Fuzzy-PID (FPID) controller,...
According to the real-time deviation between indoor dry-bulb temperature and set temperature, traditional PID control method of split air-conditioning is used to calculate the output power of split air-conditioning. Using the control method in a split air conditioning system, the rise time is often in contradiction with the overshoot of the control temperature when the temperature deviation is larger...
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