1: Analyze Energy (Programming)
Stage 1 of Energy Analysis (PM)
This process is concerned with determining the comfort, energy demand and energy use of a building based on the initial programming of a project.
For a building requiring a high degree of energy efficiency, the energy analyst is considered to be able to influence the overall spatial and envelope design of a building at this stage. 
Process Overview
In the following subsections each process element will be described in more detail.
1.1: Derive Building Information
Description:
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From building model provided, derive:
- the building location;
- the building orientation;
- the overall floor area of the building from the building volume and/or the volume of the spaces within the building;
- the number of storeys within the building;
- the number of people occupying the building (number of people may also be given by space type).
At this stage in the design, it is assumed that space information is available as a list of spaces required with spaces being defined according to space type (see separate task). It is also assumed that overall construction principles can be determined (see separate task) but that the proportions of glazing within spaces are not yet fixed. These are proposed by the energy analyst in conjunction with the building design role. The building model then allows perimeter lengths to be determined in conjunction with which glazing proportions can be proposed. |
1.2: Acquire Space Type Data
Description:
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Space type data provides required information about the various types of spaces with which the proposed spaces within a building will conform. For the purposes of this process, type data includes space comfort criteria including temperature (winter and summer) and minimum fresh air requirement (either on the basis of fresh air per person or per unit area).
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1.3: Acquire Construction Type Data
Description:
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Construction type data refers to the 'type' approach to be used for the building at this stage. Data required for construction types at this stage is for thermal transmittance/response for demand and energy use calculation. It is unlikely that, structure and mechanical systems constructions will be known at this stage.
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1.4: Set Energy Target
Description:
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Defines the type of building in terms of its intended energy use categorization.
For example, buildings may be categorized such that:
- A is the most energy efficient that is achievable with acceptable costs. To achieve this, all elements (building, ventilation, cooling system, energy production etc.) must interact. Energy analyst is enabled to have an impact on the total building design including orientation, configuration and positioning of spaces.
- B where the target is construction and system optimization but not probable that energy analyst will have an impact on space configuration and layout.
- C which is a building upon which an energy analyst has no impact on spaces or construction types. These are fixed. Systems can still be optimized
- D which is a building that you can only check against labeling requirements (or determine energy demand). This is a level which is predominant today.
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1.5: Set Glazing Proportion
Description:
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Proposes the proportion of glazing within a space or within a building according to regulations and the expressed requirements of the client. The glazing proportion may be determined in conjunction with the construction type of a building to achieve a required result. If an energy efficient construction is used, the glazing proportion may be increased to admit more light. |
1.6: Analyze Energy Demand And Comfort
Description:
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Energy demand is the heating and/or cooling load that may be used for the purposes of determining system provisions. It takes into account energy inputs from incidental sources such as lighting, machinery etc. Information about the incidental sources is provided by space type data.
Demand is calculated using an appropriate analysis method. |
1.7: Select Energy Source
Description:
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Selection of an energy source for the building for the purposes of energy consumption analysis and costing. At this stage, various alternatives may be tested with selection being made later based on an optimum result.
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1.8: Analyze Energy Consumption
Description:
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Uses an appropriate analysis method and determines the rate of energy consumption of the building. This is typically given as a rate per unit area.
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1.9: Estimate Energy Cost
Description:
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Determines the energy cost of a building over the time scales required based on tariff (cost) information available from the source provider.
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