Introduction to Building Services Management Software

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Transcript of Introduction to Building Services Management Software

Introduction to Building Services Management Softwareby Priyantha Bandara

Presentation Outline Overview Why Building Management Software? Building Information Modelling Building Energy Modelling EnergyPlus Google Sketchup Open Studio Plug-in IES-VE ComfortAir

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Overview Buildings account for approximately 40% of the global energy consumption and approximately 36% of the total CO2 emissions. In order to achieve sustainable development, high emphasize is placed on reducing the energy consumption in buildings. Limit the consequences on the local and global environment by enhancing the performance of buildings and to reduce the carbon footprint. Performance Analysis of Buildings is a systematic process.3

Why Building Management Software ? With the rising cost of energy and growing environmental concerns, the demand for sustainable building facilities with minimal environmental impacts is increasing. Todays building designers need to satisfy many different criteria to provide high quality, comfortable buildings that also comply with building regulations, minimize life cycle costs to the clients, optimize energy costs and reduce environmental impacts.4

Why Building Management Software contd..? The most effective decisions regarding sustainability in a building facility are made in the early design and preconstruction stages. In this context, Building Information Modeling (BIM) can aid in performing complex building performance analyses to ensure an optimized sustainable building design. Optimal design solutions are not easy to find without sophisticated design and analysis tools5

Typical Building Management Software Applications Building comfort analysis HVAC systems design Design and analysis of buiding services networks (Steam, water, gas, compressed air, refrigerants etc.) Estimation of building energy usage Estimation of carbon footprint/emissions of buildings Day-ligting analysis Solar shading analysis Ventilation and airflow analysis Indoor air quality and pollutant dispersion analysis 6

Typical Building Management Software Applications contd..

Thermal Analysis

Solar Radiation Analysis

Day-lighting Analysis

Air flow Analysis

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Typical Building Management Software Applications contd..

Building Energy Analysis

Solar Shading Analysis

Pollutant Dispersion Analysis

Building Services Systems Modelling

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Building Information Modelling Building Information Modelling (BIM) is the process of generating and managing building data during its life cycle. A Building Information Model (BIM) is a digital representation of physical and functional characteristics of a facility. It serves as a shared knowledge resource of information on a facility forming a reliable base for decision making during its life cycle from inception onwards. Collaboration by different stakeholders at different phases of the life-cycle of a facility to insert, extract, update or modify information in the model to support and reflect the roles of that stakeholder. 9

Building Information Modelling

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Building Information Modelling

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Building Information Modelling contd.. Building Information Modelling covers geometry, spatial relationships, lighting analysis, geographic information, quantities and properties of building components (for example manufacturers' details) BIM can be used to demonstrate the entire building life cycle, including the processes of construction and facility operation Dynamic information of the building, such as sensor measurements and control signals from the building systems, can also be incorporated within BIM to support analysis of building operation and maintenance12

Building Information Modelling contd.. The potential to simulate building performance using BIM is among the emerging technologies and one of the future thrust areas. As these tools develop, many engineering firms are devising ways to share data among their BIM models and energy modelling programs Interoperability is defined as the ability to manage and communicate electronic project data among collaborative firms and among different departments (design, procurement, construction, maintenance, and business promotion etc.) of the same company13

Building Energy Modelling This is the key element of the broader discipline of building simulation. A field that studies thermal aspects, day lighting, moisture control, airflow & indoor air quality and acoustics of buildings. Involves modelling the aspects that have a direct impact on energy usage and thermal comfort of buildings. An energy model is a representation of a building for the purpose of building energy simulation. It consists of all the design and operating parameters associated with the energy consumption of that building.14

Building Energy Modelling contd.. Design parameters include Building envelope parameters (Building shape, Orientation, Wall-to-window ratio, Insulation aspects, Glazing, Shading factors etc.) Installed electrical power for lighting and user equipment Occupancy levels Activity levels HVAC systems capacity Building services system specifications15

Building Energy Modelling contd.. Operating parameters include operational aspects on Building lighting User equipment Occupancy Activity Processes HVAC controls Other utility data16

Building Energy Modelling contd..Governing Principles Application of physical laws leads to a set of governing equations among the variables of the physical model (Building), which together constitute the mathematical model. Energy balance equations for building zone air and building surface heat transfer will be solved by the energy modelling tool. Coded and subsequently run on a computer to obtain a converged solution.17

Governing Principles contd.. Energy balance for building air

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Energy balance for building surfaces

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Computational Model

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Building Energy Modelling contd.. The simulation utilizes the energy model data, combines it with historic weather data, and estimates the performance of the entire building and system components on hourly/daily/annual basis. As a design tool, energy models provide a comparative analysis between different options/scenarios. This can occur during the conceptual stage to determine the energy impacts of an architectural form or can occur later in the design to evaluate the impact of a specific choice of the building. 20

Building Energy Modelling contd.. As an accounting tool, energy models are most often used to compare a proposed design against a benchmark. Building energy rating systems (LEED, Green Star, BREEAM etc.), National energy codes and tax incentives are all examples of using energy models in this capacity. As a financial justification tool, energy models must be used very cautiously. It is critical that the energy models are properly validated and calibrated prior to utilizing them.21

Building Energy Software Autodesk Green Building Studio DesignBuilder ECOTECT EnergyPlus eQUEST ESP-r Integrated Environmental Solutions Virtual Environment (IES-VE)22

EnergyPlus

State-of-the-art building energy modelling tool that has an enormous reputation for high accuracy of results A new generation building energy modelling tool based on DoE (U.S. Department of Energy)-2 and BLAST (Building Loads Analysis and System Thermodynamics), with numerous added capabilities23

EnergyPlus contd.. EnergyPlus is an energy analysis and thermal load simulation program based on a user's description of a building from the perspective of the building's physical make-up and associated mechanical and other systems. EnergyPlus calculates heating and cooling loads necessary to maintain thermal control set points, HVAC system and coil loads, and the energy consumption of primary plant equipment.

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EnergyPlus Key Characteristics Integrated, simultaneous solution where the building response and the primary and secondary systems are tightly coupled Sub-hourly, user-definable time steps for the interaction between the thermal zones and the environment; variable time steps for interactions between the thermal zones and the HVAC systems ASCII text based weather, input, and output files that include hourly or sub-hourly environmental conditions, and standard and user definable reports, respectively25

EnergyPlus Key Characteristics contd.. Heat balance based solution technique for building thermal loads that allows for simultaneous calculation of radiant and convective effects at both in the interior and exterior surface during each time step Transient heat conduction through building elements such as walls, roofs, floors, etc. using conduction transfer functions Improved ground heat transfer modeling through links to three-dimensional finite difference ground models and simplified analytical techniques26

EnergyPlus Key Characteristics contd.. Combined heat and mass transfer modelling Thermal comfort models based on activity, inside dry bulb, humidity, etc. Anisotropic sky model for improved calculation of diffused solar radiation on tilted surfaces Advanced fenestration calculations including controllable window blinds, glazings, layer-by-layer heat balances that allow proper assignment of solar energy absorbed by window panes, and a performance library for numerous commercially available windows27

EnergyPlus Key Characteristics contd.. Daylighting controls including interior illuminance calculations, glare simulation and control, luminaire controls. Emissions / pollutants calculations that predic