IBPSA2009

Currently, there is a high emphasis on reducing the energy consumption and carbon emissions of buildings worldwide. Korea is facing an emerging issue of energy savings in buildings in perspective of new green economic policy. In this context, various policy measures including the energy efficiency ratings for buildings are being implemented for domestic and non-domestic buildings.

Following the introduction of the Energy Performance of Building Directive 2002/91/Ce (EPBD) the energy performance evaluation of buildings takes on a significant role in respect to legal requirements and to the Energy Performance Certification market. The Directive 2006/32/Ce on Energy End Use Efficiency and Energy Services (EEESD) introduces some news related to EPBD, for example: Esco, Energy management, and Energy Audits.

This paper presents the work carried out under Subtask D of the International Energy Agency SHC Task 34/ECBCS Annex 43 (Testing and Validation of Building Energy Simulation Tools). The goal of this Subtask (Mechanical Equipment and Control Strategies) was to develop methods to help evaluating, diagnosing and correcting HVAC mechanical equipment simulation software. 

Advanced control and operation of HVAC systems in buildings is one of the most promising energy efficient technologies. However, there is still significant energy saving potential in these systems. Energy savings can come from correcting deficiencies through building commissioning. This paper focuses on deficiencies in the controls of a variable air volume (VAV) air handling unit (AHU) system. This paper demonstrates how DeST, a building simulation tool, is used to detect faults and to optimize set points in VAV AHU system controls.

The PSTAR (Primary and Secondary Terms Analysis and Renormalization) method was developed by the National Renewable Energy Laboratory (NREL) to determine the key thermal parameters of a building from short-term outdoor test results. This paper shows an application of the PSTAR method as a quantitative guidance to calibrate a detailed thermal model of a dwelling. An existing dwelling sited in southern Spain is used as a case study.

In this paper, the environment and energy performance of an actual coupled earth tube and natural ventilation system in a gymnasium was measured during the post-acceptance step in two operation states: no ventilation and natural ventilation. From the measurement result, the authors conducted the commissioning for this system. By the use of the CFD (Computational Fluid Dynamics) coupled analysis with natural ventilation method, the natural ventilation air volume and the indoor temperature in summer and autumn while windless have been calculated.

A series of new simulation tools are being developed to help the building energy auditor in establishing his diagnosis (including benchmarking and detailed analysis of actual energy consumption) and in evaluating the selected Energy Conservation Opportunities (ECOs).  The Building-HVAC System global models presented here include simplified models of building zones and of HVAC equipment. Only a limited number of easily identifiable parameters are required. The simplicity of the models and the use of an equation solver to run the simulation ensure good robustness and full transparency.

In this study, the data related to the thermal performance of a single family house, such as room temperatures, incident solar radiations on external surfaces, form factors between external surfaces and outside environment were measured and compared with the simulated results using developed EESLISMver6. 

Energy consumption in buildings is currently a real problem. That is why both assessment of energy performance and effective energy management are essential. In this context, the present paper focuses on developing a commercial monitoring station (BEMS) with the support of three industrial partners, Apex-BP Solar, Pyrescom and the "Centre Scientifique et Technique du Bâtiment" (CSTB).

As a part of commissioning case study, the cooling ceiling system of a commercial building in Brussels is experimentally evaluated by means of a functional test procedure and a detailed thermal model of this system. This one has to be used in situ, as diagnosis tool in commissioning process in order to determine the main parameters of the cooling ceiling systems. Due to the extended glazing surface of the building, the problem is the overheating of zones submitted to the expected solar heat gains.