This paper summarizes a study undertaken to reveal potential challenges and opportunities for using building performance simulation (BPS) tools. The paper reviews current trends in building simulation and outlines major criteria for BPS tools selection and evaluation based on analyzing user's needs for tools capabilities and requirement specifications. The research is carried out by means of a literature review and two online surveys. The findings are based on an inter-group comparison between architects and engineers'. The aim is to rank BPS tools selection criteria and compare ten state-of-thearts BPS tools in the USA market. Five criteria are composed to stack up against theories and practices of BPS. Based on the experience gained during the survey, suggested criteria are critically reviewed and tested. The final results indicate a wide gap between architects and engineers priorities and tools ranking. This gap is discussed and suggestions for improvement of current tools are presented.

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We present two perimeter daylighting systems that passively redirect beam sunlight further from the window wall using special opticalfilms, an optimized geometry, and a small glazing aperture. The objectives of these systems are (I) to increase daylight illuminance levels at 4.6-9.1 m (15-3Oft) from the window aperture with minimum solar heat gains and (2) to improve the uniformity of the daylighting luminance gradient across the room under variable solar conditions throughout the year. The designs were developed through a series of computer-assisted ray-tracing studies, laser visualization techniques, and photometric measurements and observations using physical scale models. Bi-directional illuminance measurements in combination with analytical routines were then used to simulate daylight pegormance for any solar position, and were incorporated into the DOE-2.lE building energy analysis computer program to evaluate energy savings. Results show increased daylight levels and an improved luminance gradient throughout the year compared to conventional daylighting systems. INTRODUCTION Traditional daylight designs can provide adequate daylight within 4.6 m (15 ft) of the window. If daylight can be used to offset lighting energy requirements over a larger floor area, additional energy savings can be obtained. However, the use of larger windows and higher transmittance glazings to provide sufficient levels of daylight at distances further from the window has proven to be ineffective. Daylight levels decrease asymptotically with distance from the window, so that a disproportionate amount of daylight/solar radiation must be introduced into the front of the room to achieve small gains in daylight levels at the back of the room. While this can increase lighting energy savings over a larger floor area, the corresponding increase in cooling due to solar heat gains can offset these savings and exacerbate peak load conditions (Lee et al. 1994). The non-uniform workplane illuminance distribution and luminance gradient within the space can also result in an uncomfortable lighting environment. In this paper, two advanced daylighting systems-light shelves and light pipes-were designed to provide higher workplane illuminance levels deeper into the space over substantial daytime operating hours during the year. The two systems are presented in detail, along with the methods used for their design, daylighting and energy consumption evaluation. Finally, daylight and energy performance results are presented and discussed, along with recommendations for further research.

Architects, designers and engineers involved in a sustainable design project often require information and tools beyond energy simulation software. They look for tools to support their decisions and to assess the risk involved in decision making. This research presents a framework that links building performance assessment tools with the Leadership in Energy and Environmental Design (LEED) rating system. The objective is to bridge the gap between architects, engineers, contractors, facility managers and LEED professionals. This work provides information about performance tools that can be used in the different phases of design, construction and operation of a LEED-rated building. This research presents a three-dimensional matrix of the 'right tool for the right job at the right time' by linking LEED credits, software tools and phases of building design, construction and operation. Overall, the findings of the research demonstrate that the framework can be used to achieve 21% of total possible LEED 3.0 credits by providing about 36% of total possible points.