Technical isometric perspective illustration of a modern HVAC and plumbing building renovation system for a research facility, clean architectural cutaway diagram style, soft blue and grey color palette with orange accent highlights, white background The scene shows: - Outdoor technical platform on concrete slab with two large air-to-water heat pump units (thermofrigopompe + groupe froid, Climaveneta style, R454B refrigerant), mounted on anti-vibration spring isolators, surrounded by vertical acoustic panels - 4-pipe hydraulic network (chaud 45°C / froid 7°C) with insulated steel pipes running from outdoor plant room into building - Two 4000L buffer tanks (ballons tampon) for heating and chilled water circuits, insulated with polyurethane foam cladding - Circulation pumps (Wilo type) with variable speed drives on pump manifolds - Combined air and dirt separator (Spirocombi type) on primary return circuits - Water treatment station with softener and injection pot - Indoor fan-coil units (ventilo-convecteurs) installed in ceiling of office and lab spaces, connected to 4-pipe network - Separate outdoor platform with Variable Refrigerant Flow (VRF/DRV) units (Mitsubishi City-Multi PURY-P series) on a second concrete slab, with Big Foot anti-vibration supports and acoustic enclosure - Interior DRV cassette and wall-mounted units inside building spaces - Horizontal insulated copper refrigerant pipes (liquid and gas) routed through false ceilings - GTC/BMS control panel (Siemens Mehr sehen