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BPS backgrounds

BPS creates a common language between disciplines. Architects, engineers, physicists, and environmental specialists may focus on different objectives, but simulation allows them to work on the same building model and evaluate the same design choices from their own perspective. In this way, BPS supports both technical depth and interdisciplinary collaboration.

Physics

Physics is one of the fundamental scientific foundations of building performance simulation. Buildings are governed by physical processes such as heat transfer, radiation, airflow, moisture transport, and energy conservation. A physics background therefore provides a strong basis for understanding how and why simulation models represent real building behavior.

People trained in physics use BPS to apply theoretical principles to practical systems. Instead of studying conduction, convection, or thermodynamics in isolation, they can observe how these effects interact in walls, rooms, façades, and technical systems under changing weather and operating conditions. This makes simulation especially valuable for analyzing dynamic and coupled phenomena that are difficult to capture with simple calculations.

Physics also helps users judge whether a model and its results are credible. A physicist is often well equipped to assess assumptions, identify non-physical behavior, and understand the sensitivity of results to input parameters. For that reason, physics plays an important role in advanced modeling, model validation, and research-oriented BPS applications.

Mechanical engineering

Mechanical engineering is closely connected to BPS because buildings contain many energy-related and thermodynamic processes. Heating, cooling, ventilation, pumping, heat exchange, and thermal storage are all areas in which mechanical engineering knowledge is directly relevant. BPS gives mechanical engineers a way to study these processes within the full context of the building.

A major reason mechanical engineers use BPS is that building systems operate dynamically rather than under fixed conditions. Loads change with weather, occupancy, and controls, and systems rarely run continuously at design point. Simulation makes it possible to evaluate annual performance, part-load operation, system response, and the interaction between equipment and building demand more realistically than static calculations.

BPS is also important for system comparison and optimization. Mechanical engineers can test alternative concepts, compare efficiencies, assess control strategies, and avoid oversizing or mismatching systems. In this way, simulation supports better technical decisions and helps ensure that building systems perform efficiently in real operation, not only in theory.

MEP/HVAC engineering

MEP/HVAC engineering is one of the most direct fields of application for building performance simulation. Building services are responsible for heating, cooling, ventilation, water-related systems, and in many cases the technical conditions that determine comfort and indoor environmental quality. Because these systems depend strongly on building loads and usage patterns, BPS is an essential design tool.

For HVAC engineers, simulation goes beyond traditional peak-load sizing. It allows the analysis of annual energy use, zone-level temperatures, ventilation needs, latent and sensible loads, and control behavior over time. This is especially important in efficient buildings, where partial-load operation, control quality, and the interaction between envelope and system often matter more than the peak condition alone.

BPS also supports coordination between disciplines. Changes in glazing, shading, insulation, occupancy, or building form directly affect technical system requirements. By simulating these interactions early, MEP/HVAC engineers can work more effectively with architects and building physicists, reduce redesign effort, and create more robust and efficient solutions.

Building physics

Building physics is deeply connected to BPS because it focuses on the physical behavior of the building itself. Topics such as heat transfer through the envelope, solar gains, thermal bridges, moisture, airtightness, and indoor climate are all central to both building physics and simulation. BPS provides the dynamic framework needed to study these effects in an integrated way.

Building physicists use BPS because simplified indicators alone are often not sufficient to judge real performance. U-values and steady-state methods are useful, but they cannot fully describe how thermal mass, shading, ventilation, internal gains, and weather interact across time. Simulation makes these effects visible and allows more realistic evaluation of heating demand, cooling demand, and comfort conditions.

BPS is particularly valuable when assessing trade-offs and risks. A façade solution may improve daylight while increasing overheating risk, or a highly insulated envelope may reduce heating demand while changing summer behavior. Building physics uses simulation to quantify such interactions and to support evidence-based decisions about envelope design, passive performance, and indoor environmental quality.

Environmental engineering

Environmental engineering uses BPS because buildings are major contributors to energy use, emissions, resource consumption, and indoor environmental conditions. Environmental engineers are interested not only in technical operation, but also in sustainability, resilience, and the broader impact of buildings on people and the environment. BPS helps quantify these relationships under realistic operating conditions.

One of its main benefits is that it supports dynamic sustainability assessment. Operational energy use, carbon-related impacts, overheating risk, renewable integration, and indoor comfort all depend on time-varying conditions. Simulation allows environmental engineers to evaluate whether a building concept truly performs well across seasons, user patterns, and climatic conditions, rather than only under simplified assumptions.

BPS also fits well with the systems-oriented perspective of environmental engineering. Buildings interact with weather, infrastructure, energy supply, and climate adaptation strategies. Through simulation, environmental engineers can test passive solutions, low-carbon system concepts, and resilience measures in a structured way, making BPS a key tool for sustainable building design and operation.

Architecture

Architecture needs BPS because early design decisions strongly influence how a building performs later in use. Orientation, form, façade design, glazing ratio, shading, and spatial organization all affect daylight, comfort, and energy demand. BPS helps architects understand these consequences while the design is still open to change.

For architects, simulation is valuable because it supports informed design exploration. Different massing options, façade concepts, or shading strategies can be compared before the design is fixed. This makes BPS a tool not only for checking compliance, but for actively shaping better design solutions with stronger environmental performance.

BPS also helps architects connect design quality with user experience. Good architecture is not only visually convincing, but also comfortable, climate-responsive, and robust in operation. By using simulation, architects can better integrate environmental performance into the design process and create buildings that are both expressive and high-performing.

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