A comfortable indoor climate environment is necessary for modern buildings and therefore the Heating, Ventilation and Air-Conditioning (HVAC) systems are widely used. Faults or disturbances are normally unavoidable in the systems and they will lead to more energy consumption or degradation of comfort level of indoor climate. Energy consumption is useful to detect the faults. Fuzzy Neural Networks (FNN) model is presented and discussed in this paper.
This paper demonstrates one step forward in the development of virtual laboratories that can be used for the development and test of HVAC control systems. While predefined parameters are used for standard tests, individual tests of controllers on different building construction and types or for different boundary conditions need, for each test, new sizing of the components of the HVAC system.
A holistic approach to the design and procurement of a project should result in a building, which can become uniquely embedded in its natural, social and economic environments, like a living system. In a strange way my African experience has lead me to these ideas and I shall talk about why I think this has happened This conference has its focus on the importance of the role of simulation techniques and I shall show how these have become an essential part of the process.
Condensation and mold problems have been identified as one of the severest IAQ problems in Japan. Especially in the wintertime, moisture condenses on cold wall surfaces where it can cause deterioration of the building materials and mold growth related to allergic symptoms. This paper discusses the possibility of using the CFD method to solve condensation problems. Firstly, a CFD model for simulating condensation is developed, and then the validity of this model is examined experimentally.
The EnergyPlus building energy simulation software has been tested using the IEA HVAC BESTEST E100-E200 series of tests. The Volume 1 final report for the International Energy Agency (IEA) Building Energy Simulation Test and Diagnostic Method for Heating, Ventilating, and Air-Conditioning Equipment Models (HVAC BESTEST), was recently published in January 2002. HVAC BESTEST is a series of steady-state tests for a single-zone DX cooling system. Cases range from dry to wet coil, low to high part load, and low to high temperatures.
This paper documents work that follows on from a previous study [Morbitzer et al 2001] on the implementation of a simulation-tool into an architectural practice at outline design stage. The use of simulation is now pervasively and routinely undertaken by designers within the company to evaluate energy and environmental performance of their design concepts. The paper documents the changes to the interface, based on the feedback from designers.
The purpose of this study is to gain insight into the process of heating a room with a low-temperature radiant heating system and solar energy, considering energy conversion and heat transfer steps in the building (where heat is required), in the incident solar radiation (which supplies part of the heat required) and in the heating system (which provides for the additional heating needs, by using electricity from a gas-fired power plant to drive a heat pump). We applied a theoretical framework developed by Shukuya, et. al.
The most dominant moisture-related problem in building materials is probably mold growth. It occurs as a result of relatively high moisture concentrations. Although recent research has established the causal, physical-biological relationship between moisture content, temperature, material type, and mold growth, we do not have an established set of causal relationships between certain building parameters (such as envelope characteristics) and the risk of mold growth.
At the new institute building of Fraunhofer ISE, both mechanical and free night ventilation is used for passive cooling of the offices. The results from a monitoring of room temperatures in 21 office rooms during summer 2002 show that room temperatures exceeds 25 °C in less than 8 % of the working hours, even at high ambient air temperatures. In two offices, experiments were carried out in order to determine the efficiency of night ventilation dependent on air change rate, solar and internal heat gains. During the experiments, meteorological data, air change rates, air temperatures (incl.
This paper demonstrates an experience in the development of a design performance evaluation system that can frequently evaluate building design performance within the design process in a real-time manner. The evaluation system, that we call "Vitruvius Studio," is composed of several modules such as a front-end component-based CAD engine, a knowledge base, and a set of design agents.
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