Tender for Comprehensive Building Energy Efficiency Retrofit by the Central Apulia Housing and Environment Regional Agency

Project Name: Public Tender for Lot 64 - Comprehensive Energy Efficiency Services for Buildings of the Central Apulia Housing Agency - Using Project Financing, in accordance with Article 193 and subsequent articles of Italian Legislative Decree No. 36/2023

Tender Procedure: Open Tender

Legal Basis: EU Directive 2014/23/EU (Concession Contracts)

Contract Nature: Works

CPV Code: 45261420 (Roof-waterproofing works)

Total Estimated Project Value (excl. VAT): €22,164,738.55

Project Location:

Gravina in Puglia, Province of Bari, Apulia Region, Italy

Project Description:

This project is Lot 64, employing a project financing model to provide comprehensive, all-inclusive energy efficiency services for multiple public residential buildings in Gravina in Puglia. The scope covers full lifecycle management from design and construction to long-term operation and maintenance, as part of a strategic energy retrofit program under EU funding frameworks.

Design and Engineering

Energy Diagnosis and Condition Assessment

Building Envelope Thermal Survey: Use infrared thermography to detect thermal bridges, air leakage defects, and moisture ingress paths; use blower door tests to determine air change rate n50, target value ≤0.6 h⁻¹.

Equipment System Efficiency Testing: Conduct on-site efficiency tests for existing boilers, pumps, fans, and lighting systems, producing seasonal energy efficiency ratio and thermal efficiency reports based on UNI 10349 standard.

Indoor Environmental Quality Baseline Survey: Deploy continuous monitoring points in typical apartment layouts, recording 7×24-hour temperature, relative humidity, CO₂ concentration, PM2.5, and illuminance distribution to identify areas of thermal discomfort and ventilation dead zones.

Renewable Energy Potential Analysis: Use PVGIS tool to assess rooftop and façade photovoltaic installation potential, combined with building shadow simulation, recommending optimal tilt angle and installed capacity (suggested ≥20 kWp/building).

Resident Energy Consumption Behavior Profiling: Cluster analysis of historical utility bills to categorize high, medium, and low-energy consumption households, providing data support for behavioral guidance strategies.

Preliminary Design, Final Design, and Construction Drawings

BIM Full-Process Collaboration: Use Autodesk Revit or Archicad to develop LOD 350 models, integrating architectural, structural, and MEP disciplines for clash detection and MEP coordination optimization, with a target clear height ≥2.4 meters.

Passive Design Optimization: Use PHPP or DesignBuilder to simulate the impact of different insulation schemes (EPS, rock wool, aerogel blankets) on annual heating demand, ensuring post-retrofit primary energy consumption ≤50 kWh/(m²·a).

Active System Selection: Compare technical-economic feasibility of air-source heat pumps, ground-source heat pumps, and gas condensing boilers, calculate lifecycle costs, and recommend optimal configuration.

Digital Delivery Standards: Design phase deliverables must include IFC-format BIM models, NWC lightweight viewing files, and PDF/A-3 long-term archival documents.

Equipment Selection and Technical Specification Preparation

Core Equipment Performance Thresholds:

Heat Pumps: IPLV ≥ 4.5, refrigerant GWP ≤ 750, noise ≤ 55 dB(A) @ 10m;

Windows: Whole-window thermal transmittance Uw ≤ 0.85 W/(m²·K), solar heat gain coefficient g-value 0.45～0.55, sound insulation Rw ≥ 38 dB;

LED Luminaires: Luminous efficacy ≥ 140 lm/W, adjustable color temperature 3000-4000K, color rendering index CRI ≥ 90, lifetime L70 ≥ 50,000 h.

Additional Environmental Requirements for Materials: Insulation materials must have EPD (Environmental Product Declaration) certification, VOC emissions must comply with EU EMICODE EC1 Plus standard.

Energy Performance Certification Simulation and Compliance Submission

NZEB Compliance Verification: Based on DM 26/06/2015 and UNI/TS 11300 series standards, establish a national calculation engine model, output APE (Energy Performance Certificate) draft, ensuring post-retrofit buildings achieve Nearly Zero-Energy Building level.

Incentive Policy Alignment: Assist the client in applying for Conto Termico 2.0 (Thermal Account subsidy) or Ecobonus 110% (if policy continues), prepare technical-economic feasibility reports and monitoring & verification plans.

Construction and Implementation

Building Envelope Insulation Retrofit

External Wall Insulation System:

Insulation Thickness: Determined based on linear thermal bridge optimization calculation, recommended ≥120 mm (λ ≤ 0.032 W/(m·K));

Anchors: Stainless steel or polyamide expansion anchors, tensile capacity ≥ 0.60 kN;

Finish Coat: Silicone resin textured paint, water permeability ≤ 15 g/L, self-cleaning grade compliant with ISO 27448.

Roof Refurbishment:

Inverted Insulation System: XPS extruded polystyrene board (λ ≤ 0.034 W/(m·K)), slope ≥2%, covered with protection layer (gravel or concrete pavers);

Waterproofing Layer: Double-layer APP modified bitumen membrane (thickness ≥4+3mm), seams heat-welded, overlap width ≥100mm.

Basement Ceiling: Sprayed polyurethane foam (λ ≤ 0.026 W/(m·K)), thickness ≥80 mm, with compatible fire-retardant coating (class B-s1,d0).

Roof Waterproofing and Refurbishment

Existing Waterproofing Removal: Use low-noise scraping equipment, strictly prohibit destructive methods damaging structural slab, waste sorted and temporarily stored, included in asbestos screening procedure.

Detail Reinforcement:

Parapet flashing height ≥250 mm, termination with galvanized trim + sealant;

Roof penetration bases use prefabricated conical collars, additional waterproofing layer upstand ≥300 mm;

Gutters lined with stainless steel sheet, slope ≥1%, end connected to rainwater outlet.

Green Roof Provision: After structural load verification, reserve 5% roof area for lightweight green roof (Sedum substrate thickness ≥80 mm), compliant with UNI 11235 standard.

Window Replacement

Installation Methodology:

Sub-frame Installation Method: Aluminum or PVC sub-frame mechanically fixed to structural wall, gaps filled with polyurethane foam, eliminating thermal bridges;

Air Permeability Class: Class 4 (EN 12207), Water Tightness Class E1950 (EN 12208);

Wind Load Resistance: Class C5 (EN 12210).

Integrated Shading: South-facing windows integrate external electric roller blinds (solar-powered), shading coefficient ≥ 0.8, linked to indoor light sensors.

Heating/Cooling System Upgrade

Heat Pump Plant Room Retrofit:

Configure inverter-driven low-temperature air-source heat pump units, adjustable flow temperature range 25-55°C;

Buffer tank volume sized at 10% of total system water volume, with stainless steel inner tank;

Weather Compensation Control: Automatically adjusts supply temperature curve based on outdoor temperature.

Terminal Unit Upgrade:

Remove existing cast iron radiators, replace with low-temperature aluminum radiators (flow/return 45/35°C) or fan coil units (low-noise type ≤35 dB);

Install thermoelectric actuators on in-apartment manifold for individual room temperature control.

LED Lighting System Retrofit and Smart Control

Common Areas:

Stairwells and basements use radar-sensing LED panel lights, standby power ≤ 0.5W, illuminance auto-adjusts from 50 lx (unoccupied) → 150 lx (occupied);

Underground parking lanes use linear LED luminaires, with group control + time schedule.

In-Apartment Recommended Package:

Provide basic LED lighting package (including downlights, ceiling lights, vanity lights);

Pre-wire for smart home interface (ZigBee 3.0), supporting mobile APP scene settings.

Renewable Energy System Installation

Photovoltaic System:

Monocrystalline silicon modules (≥21% efficiency), string inverters (MPPT efficiency ≥98%);

Grid Connection: Self-consumption with grid feed-in, configure bidirectional electricity meter;

Monitoring Platform: Real-time display of power generation, self-consumption rate, CO₂ reduction.

Solar Thermal Hot Water System:

Flat plate collectors (efficiency ≥ 75%), pressurized storage tanks (capacity ≥300L/household);

Auxiliary Heat Source Integration: Automatically activates heat pump for supplementary heating when stored water temperature <45°C.

Operation and Management

Long-term Operation Management of Energy Facilities

Service Desk Setup: Establish a 7×12 hour customer service center to handle repairs, inquiries, and complaints, with 30-minute response time and 4-hour resolution for common faults.

Preventive Maintenance Plan: Develop annual maintenance calendar based on equipment manufacturer manuals, including heat pump refrigerant pressure checks, PV module cleaning (twice yearly), filter replacement, etc.

Spare Parts Inventory: Establish a local warehouse for common spare parts, critical components (compressors, controllers) available within 24 hours.

Energy Consumption Monitoring and Optimized Dispatch

Tiered Metering Architecture:

Tier 1: Building master meters (electricity, water, gas);

Tier 2: Common areas, heat pump plant room, PV generation;

Tier 3: Pilot in-apartment (10 sampled households) smart plugs.

AI Energy-saving Algorithm: Based on historical load and weather forecast, predict 24-hour heat load, optimize heat pump start-stop and thermal storage strategy, expected energy saving rate ≥8%.

Carbon Footprint Dashboard: Install digital screen in apartment lobby to display real-time community energy savings, PV generation, and carbon reduction achievements, enhancing resident pride.

End-user Energy-saving Behavior Guidance

In-home Training: Distribute "Energy Saving Handbook" to each household upon handover, containing advice on AC settings (Summer 26°C, Winter 20°C), reminders to unplug standby appliances, etc.

Competition and Incentive Mechanism: Conduct monthly "Green Family"评选, award property fee deduction vouchers (€20/month) to households with electricity consumption 15% below baseline.

Mobile Application: Develop a simplified APP for residents to view their energy consumption ranking, receive energy-saving tips, and report faults.

Maintenance Services

Preventive Periodic Maintenance

Monthly Inspection: Common area lighting, exit signs, elevator intercom system;

Quarterly Inspection: Heat pump refrigerant pressure, heat exchanger fin cleaning, PV inverter cooling fan;

Annual Inspection: Insulation layer integrity, waterproofing layer aging assessment, electrical system insulation resistance test.

Fault Response and Emergency Repair

Graded Response Mechanism:

Level 1 (Safety Hazard): On-site within 30 minutes, control situation within 1 hour;

Level 2 (Loss of Function): On-site within 2 hours, restore within 4 hours;

Level 3 (Comfort Issue): Handle by next working day.

Backup Unit Strategy: Configure one mobile backup heat pump in plant room for rapid connection during main unit failure, ensuring basic heating supply.

Major Overhaul Cycle Planning and Execution

Mid-term Plan (Years 5-7): Heat pump compressor overhaul or replacement, PV inverter replacement, window gasket survey and replacement;

Long-term Plan (Years 10-12): Complete waterproofing layer re-installation, insulation system sample repairs, elevator modernization.

Safety Remediation

Structural Safety Reinforcement

Balcony Parapet Reinforcement: For parapets with concrete carbonation depth >2mm, use carbon fiber wrap + stainless steel chemical anchors.

External Wall Cladding Inspection: Hammer tap test to survey delamination area, redo areas with delamination >0.1m² to avoid falling hazard.

Fire Safety Facility Upgrade

Fire Alarm System: Add smoke detectors (EN 54-7) in common corridors, manual call point spacing ≤30m;

Emergency Lighting: Replace nickel-cadmium batteries with lithium iron phosphate, runtime ≥3 hours;

Fire Extinguisher Provision: Add 6kg ABC dry powder fire extinguishers per light hazard classification, minimum 2 per floor.

Hazardous Material Removal and Disposal

Asbestos Survey: Engage ISO 17025 accredited laboratory to sample roof sheets, pipe gaskets, etc., for qualitative and quantitative analysis via polarized light microscopy.

Removal Plan: Set up negative pressure containment, workers wear Class A protective suits, waste sealed and labeled with electronic manifest, transported to licensed landfill;

Resident Protection: Organize temporary relocation for affected households during removal, compensation standard per Apulia regional regulations.

Existing Facility Retrofit

Electrical System Capacity Increase and Smart Upgrade

Incoming Distribution Cabinet Upgrade: Replace circuit breakers and metering devices, increase household connection capacity from 3 kW to 6 kW;

Household Distribution Board: Add SPD surge protective device, refine circuit division (lighting, sockets, AC, kitchen);

Electric Vehicle Charging Provision: Pre-install conduits and junction boxes in underground parking spaces, reserve capacity for 30% of spaces for future EV charger installation.

Water Supply and Drainage Pipe Network Renewal

Riser Replacement: Use PP-R polypropylene quiet pipes, wrapped with 10 mm closed-cell rubber insulation;

External Water Metering: Centrally install smart water meters (NB-IoT remote reading) in stairwell pipe shafts, accuracy class R100;

Leak Detection: Install electromagnetic leak detectors at each household's main water shut-off valve, linked to automatic shut-off valve.

Ventilation System Compliance Retrofit

Kitchen Make-up Air: Add exterior wall-mounted electric air inlets, interlocked with range hoods to maintain negative pressure balance;

Bathroom Exhaust: Replace with low-noise centrifugal fans (power ≤25W), with delayed shut-off function (5 minutes);

Basement Ventilation: Install CO concentration sensors, interlocked to start/stop exhaust fans, threshold set at 30 ppm.

Full Lifecycle Guarantee CommitmentPerformance Guarantee: Sign EPC (Energy Performance Contract), commit to ≥50% comprehensive building energy saving rate post-retrofit, contractor compensates for the difference if actual consumption fails to meet target.

Digital Archive: Deliver final user manual (paper + QR code), BIM FM model, and 5-year electronic inspection records.

Green Finance Facilitation: Assist client in applying for European Investment Bank ELENA fund technical assistance to cover part of design consultancy costs.

Contract Duration: 30 months

Estimated Commencement Date: June 15, 2026

Funding Source:

Fully or Partially Funded by EU Funds

Subject to GPA

Bid Submission:

Recipient: Arca Puglia Centrale

Processing Entity: Arca Puglia Centrale

Submission Platform: https://arcapugliacentrale.traspare.com/announcements/389