Airflow | CIBSE Loads
CIBSE Loads calculates design heating and cooling loads using two methods:
- Steady state heat loss calculations to predict the heating requirements for the building
- A heat gain calculation, based on the Admittance technique, to predict the building cooling requirements. The heat gain calculations can be performed for a selected design day of the week, and for a range of design months.
- The results from these calculations can be interrogated. Several post-processing calculations can then be performed, such as radiator sizing and room air supply rates.
- Simple and fast calculations of heat loss & gain
- Incorporation of loads analysis into early design stages CIBSE Guide procedures
Airflow | CIBSE Loads
Transparency and ease of understanding of the output of loads calculations is essential for all designers hence the results of the calculations can be readily accessed in a number of straight-forward approaches:
Loads Report
- Project and Climate Summary
- Rooms Loads
Calculations and detailed results output:
- Admittance and condensation calculations can be performed on constructions
- U-Values of constructions are calculated using both CIBSE and ISO standards
- Cooling loads per room and for the whole building are calculated
- Cooling loads can be calculated for building zones
- Cooling loads results are available in both tabular and graphical form
- Peak cooling loads can be displayed in terms of sensible, latent or total loads
- Cooling loads can be displayed in terms of different components (eg. solar, casual, ventilation)
- Duct supply airflow rates or supply temperatures (to meet the cooling load) can be calculated
- Peak summer time temperatures can be calculated
- Heat losses can be displayed per room and for the whole building
- Heating loads can be calculated for building zones
- Unheated spaces (eg. roof voids) can be accounted for
- Heat losses can be displayed in terms of different components (eg. fabric, ventilation), both in tabular and in graphical form
- Plant requirements for intermittent heating can be calculated
- Degree-day calculations (CIBSE B18) can be performed
- Radiator selection can be performed using a database of radiators
There are a number of output options for the calculated results too:
- Excel output for sharing with MEP design tools
- Tables and graphs can be saved and copied and pasted into other applications (eg. Word, Excel)
- Tables of results can be customised to clients’ requirements
- Documents containing results can be created ‘live’
- Room names can be sorted and displayed in different groupings to simplify analysis
- Room details and fabric constructions can be displayed and saved in text format if required (for QA purposes)
- Results can be saved in text format if required
- Inputs to the calculations mirror that required for most other calculations within the VE, this is the advantage of the VE single data model, these include A 3D model from ModelIT, or imported from an external source, see Interoperability.
- Orientation, latitude, longitude and altitude included
- Design weather
- May be selected from the latest version of ASHRAE WDVIEW global weather database
- User-defined outdoor dry-bulb and wet-bulb temperature
- Hourly cooling loads weather from ASHRAE Standard or sinusoidal
- Shading devices (eg. blinds, louvres)
- can be assigned to glazed constructions
- can be operated according to a timed profile or to the amount of incident radiation
- Solar shading and solar tracking from SunCast. Shades and adjacent building can impact solar gains and cooling loads.
- Constructions and materials:
- User defined constructions
- Construction templates from previous projects
- Thermal templates
- Heating and cooling setpoint temperatures, with night-time setbacks.
- Relative humidity setpoints
- Minimum ventilation flow rates
- Internal Gains with hourly variation.
- Schedules/Profiles may include dynamic operation, fixed as per user-input or controlled by external variables (e.g. weather)
- Infiltration
There is considerable flexibility in the approach used to the CIBSELoads calculations, giving designers choice, these analysis options include:
- The effects of mechanical or natural ventilation can be included if required
- The effects of external shading on cooling loads can be taken into account if required
- Cooling load calculations can be performed for a selected design day of the week, and for a range of design months
- Heat transfer from adjacent rooms can be taken into account if required, for heating load calculations
Source: iesve.com
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