Thermal Needs

Thermal needs are obtained by combining the thermal losses and gains calculated :

\[Q^{annual} = \sum_{b \in B} Q_{b, i}^{annual} + Q_{v}^{annual} - Q_{solar}^{annual} - \sum_{dw \in DW} Q_{occupant, dw}^{annual}\]

where \(B\) is the set of boundaries, \(Q_{solar}^{annual}\) is the annual solar gains, \(DW\) is the set of dwellings, \(Q_{occupant, dw}^{annual}\).

Heated area share

The preceding equation returns the heating needs if the whole building were heated. However, in practice, there are situations where that is not the case (example : a garage in an individual house, garbage rooms in collective housing). To model this effect, we define the heated area share as the share of a building that will be heated for residential use. Then the heating gains are obtained using the preceding equation while multiplying the losses and gains linked to building geometry by the heated area share :

\[Q^{annual} = (\sum_{b \in B} Q_{b, i}^{annual} + Q_{v}^{annual} - Q_{solar}^{annual}) \times HAS - \sum_{dw \in DW} Q_{occupant, dw}^{annual}\]

where \(HAS\) is the heated area share.

The heated area share is calculated by multiplying the living area share by a coefficient and clipping the resulting values to minimal and maximal values dependent on ‘residential_type’, ‘has_annex’ and ‘residential_only’.

Heated area share

residential type	residential only	has annex	coefficient	min	max
house	True	False	1	1	1
house	True	True	1.2	0.2	1
house	False	True/False	1.2	0.0	1
apartment	True	False	1	1	1
apartment	True	True	1.3	0.6	1
apartment	False	True/False	1.2	0.0	1