ApacheCalc

Calculate heat loss and gain calculations based on the CIBSE Guide.

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Overview

  • Simple and fast calculations of heat loss & gain
  • Incorporation of loads analysis into early design stages
  • CIBSE Guide procedures

> Technical Details

Technical Details

ApacheCalc 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.

Input Data

  • Constructions and materials
    • can be selected from a built-in database, or can be user-defined
    • can be used in subsequent projects
  • 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
  • Profiles of operation
    • can be selected from a built-in database, or can be user-defined
    • can be used to vary the amount of casual gains in a room, air exchange rates and the operation of cooling or heating
    • can be varied throughout the days of the week or the months of the year
    • can be used in subsequent projects
  • Site location and weather data
    • can be selected from a global weather database
    • data can be modified or user-defined

Analysis Options

  • ApacheLoads performs heating and/or cooling load calculations
  • 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

Results

  • 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

Outputs

  • 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