Energy

The published energy class target for marketing and certification is A. Achieving it depends on envelope performance + mechanical system choice

• PV contribution. The architect and M&E engineer jointly propose the combination that hits the target with the construction budget agreed.

Decision. No central air- or ground-source heat pump, and no separate ducted heating system. Heating is delivered by the same reversible split air-conditioning units that cool each apartment (units run in heating mode in winter). The building stays fully electric; gas combustion remains out of scope for Phase 1.

Provision so owners mount easily. The building must foresee everything an owner needs to mount AC units after move-in without chasing walls — the necessary number of indoor units per apartment, one for each habitable room (living, every bedroom, kitchen), each with:

• power supply at the indoor-unit position,
• refrigerant line routing to the matching outdoor position,
• condensate drainage.

The per-room hookup schedule is detailed in APT-09; ENG-02 owns the heating-strategy decision, APT-09 the per-apartment provisioning.

Outdoor units — facade-integrated enclosures. Provide dedicated housings on the facade to conceal the outdoor condensers, so the units don't disrupt the elevation:

• pre-fixed mounting points at each outdoor-unit position,
• the enclosure (louvered screen / recess) painted in the facade colour so it reads as part of the building, not as bolted-on plant.

Final detailing with the architect, coordinated with the facade vocabulary (BLD-05) and the loggia louvers (APT-03).

Supply air — breezers. Wall-mounted breezer (бризер) units bring filtered, tempered outside air into the habitable rooms (living, bedrooms) — decentralized, room by room, with no central ducted air-handling unit. Heat-recovery breezer models are preferred where the budget and wall depth allow. Each room is pre-provisioned for a breezer: the core penetration position and the power supply are designed in, and the penetrations are coordinated with the facade so they don't disrupt the elevation (see BLD-05 and the APT-03 loggia louvers).

Kitchen extraction. The range hood is either:

• ducted to a vertical kitchen shaft — best extraction; needs the shaft routed through every storey to roof, or
• recirculating with replaceable carbon filters — no shaft, but worse for cooking odour over time.

KAPA Projekt / the M&E engineer choose against the kitchen positions in the typical plate; the brief leans ducted-to-shaft where the geometry allows. Mirrors the open decision in APT-09.

Bathroom extraction. A quiet inline extract fan ducted to a vertical shaft, switched with the room light and with a run-on timer (specified in APT-08; named here so the ventilation picture is complete).

External wall U-values, roof U-values, and window unit specifications chosen to support the energy-class target without exotic materials. Thermal-bridge detailing reviewed at every balcony, window head, and parapet condition. The aesthetic vocabulary (brick + travertine reveals) must not compromise envelope performance.

The roof is wired and structurally sized to receive a PV array; the panels themselves are deferred to a future tender once Phase-1 operating data tells us the right size. The roof equipment screen already conceals enough of the array to keep the fifth elevation read clean.