This paper presents a methodology to effectively model the performance of central chilled water plants in campus or multi-building complexes where detailed modeling of every building served by the plant is out of the question, usually due to budgetary and/or time constraints. The work presented has evolved through years of practical experience in the analysis of central chiller plant performance for the purpose of justifying the economic merit of loadshifting and energy-saving strategies.
This paper presents the results of a neuro fuzzy control setting the fan-coils air flow rate of three zones of a dwelling to improve the comfort. The zones temperature and humidity are the input variables from which the value of Fanger’s thermal comfort index PMV (predicted mean vote) is calculated and used as comfort variable. The TRNSYS simulation program has been used to simulate the building under different weather conditions. Under winter conditions in the heating mode hot water circulates through the fan coils and under summer conditions in the cooling mode, chilled water.
The design of a naturally ventilated atrium was assessed using both wind tunnel and CFD methods to appraise and modify the response of the system to wind forces.
This paper summarizes a two volume National Renewable Energy Laboratory (NREL) report entitled "Home Energy Rating System Building Energy Simulation Test (HERS BESTEST)" (Judkoff and Neymark, 1995a). HERS BESTEST is a comparative validation method for evaluating the credibility of building energy software used by Home Energy Rating Systems.
A comparison is made between two thermal simulation modelling programs with particular reference to HVAC plant modelling. The two programs, APACHE and TRNSYS, were set up using identical building data, plant data and the same meteorological database. A seven zone constant air volume system with a further four heated and naturally ventilated zones was considered. Hourly time series results of a variety of plant and zone air conditions for a three-day winter period and three-day summer period were compared; each period containing a substantial plant shut down phase.
Visualize-ITTM is a visual data analysis tool kit. RLW Analytics has developed a number of specific data visualization tools for the study of the total load and end-use data produced by the DOE 2.1 building simulation package. The Visualize-ITTM DOE-2 Calibration Tool is designed to allow an analyst to calibrate simulation results against metered total load or end-use data. These data visualization techniques allow the user to quickly and easily view and analyze data sets that can contain several hundred thousand data points.
The volume of annual, monthly, and hourly simulation output developed by building simulation packages such as DOE-2.1 presents the building modeler with significant challenges. Developing hourly total load and end-use estimates of building performance calibrated to 15 minute or hourly metered total load or end use data requires new analytic tools that allow the modeler to quickly review the results and make iterative changes to the models.
This paper introduces a new approach towards the assessment of thermal building performance. As a specific aspect of overall building performance, thermal comfort performance is examined in detail. Two issues have been addressed. Firstly, two comfort performance measures, frequently used in Dutch practice, are analyzed and a directive for the assessment of a better comfort performance measure is discussed. Secondly, a probabilistic simulation experiment has been performed that reveals the adequacy of the present day practice.
The objective of this paper is to present an overview of the latest developrnents of the CSTB R&D program Intelligent Simulation Environment (ISE). This project tackles; the problem of fácilitating the transfer of technologies from the research centers to engineers in consulting offices dealing with building related issues (indoor air quality, energy consumption, acoustics, structural analysis, etc.).
The primary purpose of this paper is to discuss the needs and expectations concerning simulation analysis and evaluation tools from the viewpoint of the design process. The main q questions arising from this viewpoint are those considering the nature of energy use in the building sector as a factor of decision making, building design and sonte of its charac teristics as an information process, and the value added to a particular design by the utilisation of simulation tools.
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