Difference Between Sensible & Steady State Heating Loads
The adjustment applied to steady state heating loads for intermittent operation follows the treatment described in CIBSE Guide A, where it is calculated as a function of the number of hours plant operation per day. The thermal response characteristic of the room ('response factor') also plays a part in the calculation.
In the new ApacheCalc interface the number of hours operation is derived (if you tick the box 'Adjust for intermittent heating using profiles?') from the heating profile for a particular month and week day. You specify these in the box labelled 'Time settings for profiles'. The hour number is used to determine whether heating applies - if the heating profile is off at the specified hour, week day and month there is assumed to be no heating.
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