Low-Energy Student Housing: Integrated Energy and Solar Design

Low-Energy Student Housing: Integrated Energy and Solar Design documents the sustainability and building-performance components of a collaborative academic project developed for the Sustainable Building Technologies course at Politecnico di Milano. The project used comparative simulation and integrated design to test how form, envelope, solar control, ventilation, active systems, photovoltaic generation, material choices, and water management could work together in a student-housing proposal.

This page concentrates on the parts most relevant to free appropriate sustainable technology: reducing demand before adding supply, comparing alternatives through transparent indicators, and translating the process into a reusable design workflow.

The project developed a mixed-use student-housing scheme in Milan through an iterative performance workflow. Instead of treating sustainability as a final checklist, the team compared design choices at several scales: massing, orientation, windows and shading, envelope insulation, natural ventilation, HVAC systems, renewable generation, embodied carbon, and water use.

The original work was a collaborative course project. Elnaz Safari Abyazani contributed specifically to the energy-analysis package, while the wider group developed the architectural, material, environmental, and technical components. This Appropedia page is a focused technical summary and does not claim that the original shared drawings, models, or datasets are open-source.

The project followed a demand-first sequence:

• compare alternative building forms and orientations;
• reduce conductive losses through a high-performance envelope;
• balance useful daylight against excessive annual solar exposure;
• add fixed, framed, and movable solar-control systems according to orientation;
• use natural ventilation and controlled infiltration assumptions to reduce mechanical demand;
• compare active systems for the ground-floor and residential functions;
• integrate photovoltaic panels and evaluate water and material impacts.

This sequence is useful for open sustainable-design work because each decision can be documented as an input, a set of comparable alternatives, and a measurable output.

Seasonal sections were used to coordinate photovoltaic panels, a super-insulated envelope, low-emissivity glazing, external shading, south-facing solar gains, natural ventilation, radiant-floor systems, and ground heat exchange.

The envelope study tested progressively lower thermal transmittance values. Window alternatives ranged from a baseline U-value of 1.41 W/m²K to 0.80 W/m²K. The selected wall and roof target was approximately 0.18 W/m²K, identified as a practical balance between heating and cooling performance in the project model.

Nine massing alternatives were also compared. The study showed that geometry and exposed surface area affected energy-use intensity, and that increasing height or creating a highly permeable base could increase demand if the resulting external surface was not controlled.

Window configurations were assessed by orientation and room function using spatial daylight autonomy (sDA) and annual sunlight exposure (ASE). The analysis covered bedrooms, common rooms, meeting spaces, and study/co-working areas.

The shading study compared:

• fixed vertical and horizontal louvres;
• shading produced by projecting window frames;
• combined frame and perforated panels;
• movable vertical or horizontal systems.

The hybrid movable system was preferred in several cases because it lowered excessive solar exposure while retaining user flexibility. The project therefore treated shading as an adjustable performance component rather than a purely visual facade element.

Natural ventilation was tested together with mechanical-system schedules rather than as an isolated strategy. In the reported sequence, mechanical ventilation was reduced or turned off when window ventilation was available, while infiltration and operating assumptions were refined separately.

The active-system comparison included fan coils, variable refrigerant flow, active and passive chilled beams, packaged terminal or split systems, variable-air-volume and constant-air-volume configurations, and radiant floors. Different systems were selected for the public ground floor and the residential blocks because their loads and operating patterns differed.

Elnaz's contribution focused on the comparative energy-analysis workflow documented in the project archive. Within the collaborative process, she worked on evaluating envelope and system alternatives, including window, wall, and roof thermal transmittance; active-system options; and the combined effect of shading, natural ventilation, infiltration control, and efficient equipment. The analysis compared heating, cooling, fan and pump loads, and energy-use intensity across the ground-floor and residential functions.

The final comparison combined shading, natural ventilation, infiltration control, and efficient equipment. Relative to each baseline model, the reported reductions in energy-use intensity were approximately 42% for the ground floor and 50-54% for residential Blocks A-F.

These percentages represent the results of the original project models and their stated assumptions; they are not presented as measured post-occupancy savings.

Photovoltaic panels were integrated into the seasonal design concept after the project had reduced demand through form, envelope, shading, and ventilation decisions. This order is significant: renewable generation complements efficiency measures rather than compensating for an inefficient base design.

The available project archive illustrates the intended location of photovoltaic panels, but it does not provide enough openly documented information to reproduce a complete PV yield calculation. A reproducible extension should therefore publish the array area, module characteristics, tilt and azimuth, shading assumptions, weather file, system losses, and hourly or monthly generation results.

A cradle-to-gate life-cycle assessment compared the proposed material strategy with a concrete-based alternative. The project reported approximately 154 kg CO2e/m² for the proposed design and 416 kg CO2e/m² for the concrete-based comparison, with total values of about 592 t CO2e and 1,330 t CO2e respectively.

The exercise used building-element breakdowns to identify high-impact components and connect carbon reduction with material efficiency. These results should be interpreted as an academic comparative assessment rather than a verified environmental product declaration for a constructed building.

The water strategy combined roof-water collection, storage, irrigation, permeable paving, green roofs and terraces, and grey-water treatment concepts. The indoor water-use comparison reported monthly baseline use of 489,114 litres and design use of 354,438 litres, corresponding to a stated saving of 134,676 litres or 27%.

The original proprietary models and shared group files are not released through this page. A responsible open extension could reproduce the logic with independently created or permission-cleared data:

1. define climate, occupancy, geometry, and baseline-system assumptions;
2. establish common indicators for heating, cooling, fans, pumps, equipment, sDA, ASE, embodied carbon, and water;
3. change one design variable at a time before combining measures;
4. publish the assumptions and results for every alternative, including unsuccessful options;
5. add PV only after demand-reduction steps and document the full generation model;
6. package neutral input and result tables with scripts for comparison and visualisation;
7. state clearly which outputs are simulated, calculated, or measured.

This workflow could be implemented with open building-energy and solar tools and linked to neutral BIM/IFC data, making the comparison easier to reproduce and audit.

• The work is an academic design study, not a constructed-building validation.
• This page documents only the building-energy and sustainability components relevant to its stated scope.
• Reported savings depend on simulation assumptions and are not post-occupancy measurements.
• Original drawings, models, and datasets remain collaborative course material and are not represented as openly licensed resources.
• The PV concept requires additional inputs before energy yield can be reproduced.

This student-housing proposal was developed as a collaborative academic project for the Sustainable Building Technologies course at Politecnico di Milano. Elnaz Safari Abyazani contributed specifically to the comparative energy-analysis work, including the assessment of envelope and system alternatives and the interpretation of heating, cooling, auxiliary-load, and energy-use-intensity results.

This focused Appropedia documentation and the two new summary graphics were also prepared by Elnaz Safari Abyazani. The graphics restate project concepts and reported results; they do not reproduce figures from a commercial publication.