Solar-Optimised Facade Engineering

Solar- and thermal-optimised façade engineering for the tropics — low-E / solar-control glass, solar-heat-gain-coefficient (SHGC), external shading and brise-soleil, orientation and glazing ratio engineered to cut cooling load across Ghana. Facade Ghana, since 1982.

A solar-optimised façade is a building envelope engineered to keep the sun’s heat out while keeping its light in. Near the equator — Accra and Tema — the sun on the glass becomes heat inside the building, and that heat is paid for every single day by the air-conditioning. Facade Ghana has engineered performance façades across Ghana since 1982, and on this discipline our job is to cut the cooling load at the wall, not leave it for the chillers to fight.

Why Solar Performance Is a Façade Decision, Not an HVAC One

It is tempting to treat overheating as a mechanical problem — buy a bigger chiller. But the heat enters through the envelope, and the cheapest watt to remove is the one you never let in. The glass coating, how much of the wall is glazed, and whether the sun is shaded before it reaches the glass are all decided at façade-design stage. Get them right and the building is cooler, the running cost is lower, and the plant is sized sensibly. Get them wrong and no amount of air-conditioning fully recovers the loss.

Choosing the Solar Strategy for Your Building

The right strategy depends on orientation, glazing ratio and how the building is used. A north-and-south-facing tower behaves very differently from one with large east and west glass walls. The decision is a balance: enough glass for daylight and view, a coating that rejects heat without darkening the space, and external shading exactly where the low sun defeats the glass. We engineer that balance per elevation rather than applying one glass type to the whole building.

Solar-Optimised Façade Systems

Solar-Control & Low-E Glazing

The first line of defence is the glass itself. Solar-control and low-emissivity (low-E) coatings reflect and re-radiate a large share of the sun’s heat while letting daylight through. We specify the unit by its solar-heat-gain-coefficient (SHGC) and its light transmission together, so heat is rejected without turning the interior dark and driving lighting load back up.

External Shading & Brise-Soleil

Where the sun is low — east and west elevations especially — coatings alone struggle, because the light strikes the glass almost head-on. External brise-soleil fins, horizontal sunshades and projecting reveals cast a shadow on the glass before the heat arrives. Sized to the sun path, external shading is the most effective single move on a hot elevation.

Orientation & Glazing-Ratio Engineering

Before any glass is chosen, the cheapest gains come from how the building meets the sun: which elevations carry the glass, how much of each wall is glazed, and how deep the reveals are. We tune the glazing ratio elevation-by-elevation so daylight and view are kept where they are wanted and solar gain is contained where it hurts.

Solar Strategies Compared

(Strategy is engineered to the building’s orientation and use; the right mix is set at design stage, not bought off a shelf.)

How We Engineer a Solar-Optimised Façade

1. Read the climate and orientation — map the elevations that take low morning and afternoon sun before any glass is chosen.
2. Set the glazing ratio and select the glass — size the glazed area, then specify the glass by SHGC and light transmission.
3. Engineer external shading where the sun demands it — brise-soleil, fins and reveals sized to the sun path on the worst elevations.
4. Verify, install and document the build-up — confirm glass make-up and shading geometry, install to detail, hand over the glazing data and shading drawings.

Materials & Real Standards

• Solar-control & low-E glass — specified by its solar-heat-gain-coefficient (SHGC) and light transmission; SHGC is the fraction of solar heat passing through the unit, and a lower SHGC means less heat in
• Brise-soleil & sun-shading geometry — external fins, horizontal sunshades and projecting reveals sized to the local sun path so the shadow falls on the glass when the sun is strongest
• Glazing ratio & orientation — the proportion of glazed wall per elevation, tuned to balance daylight, view and solar gain
• AAMA 501 — the recognised methods for testing the glazed assembly’s performance, including AAMA 501.1 dynamic water penetration, so the solar-tuned façade is still verified as a weathertight envelope
• We describe solar control by glass coating, SHGC and shading geometry — qualitatively and honestly — and never quote a fabricated solar “rating” number.

What Affects the Cost

• The glass specified — solar-control/low-E units, coating, and whether double-glazed
• The amount and type of external shading (brise-soleil, fins, reveals) and its structure
• The glazing ratio and the number of elevations needing treatment
• Building height, access, and whether the work is new-build or retrofit

Solar-optimised façade work is quoted on survey — orientation, glass make-up, shading and access decide the figure. The honest answer in this market is that the cost follows the engineering, not a per-square-metre sticker.

Applications Across Ghana

• Corporate HQ and bank towers in Airport City and the CBD with large glazed elevations
• Institutional and government buildings where running cost and comfort are scrutinised
• Hotels and hospitality buildings on exposed east and west elevations
• Office re-glazing and external shading retrofits cutting cooling load on existing stock
• Commercial projects in Kumasi and Takoradi, on the same equatorial sun path

Areas We Serve

Facade Ghana engineers solar-optimised façades across Greater Accra — Ridge, Airport City, Cantonments, the CBD, Tema, East Legon and Spintex — plus Kumasi and Takoradi.

Related Services

• Wind-Load & Pressure Testing — façade performance verification
• Stick-Built Curtain Wall — site-assembled glazed envelopes
• Unitised Curtain Wall — factory-built façade units
• Structural Glazing — flush, frameless glazed elevations
• Ventilated Rainscreen — drained, back-ventilated façades
• Façade BIM Coordination — modelled, clash-free façades
• Heritage Façade Restoration — restoring existing envelopes
• Façade Systems Compared — choosing between systems
• Curtain Wall Cost — Ghana — the cost picture

Frequently Asked Questions

What is a solar-optimised façade and why does it matter in Ghana? It is an envelope engineered to reject solar heat while keeping daylight and view, through the glass coating, the glazing ratio and external shading. It matters because Accra and Tema sit close to the equator — sun on the glass becomes heat inside, paid for daily by the air-conditioning. Getting the façade right cuts the cooling load at source.

What is solar-heat-gain-coefficient (SHGC) and is a lower number always better? SHGC is the fraction of solar heat that passes through the glazing, so a lower number means less heat in. In a hot climate a low SHGC is generally wanted, but it is balanced against light transmission, because over-blocking glass darkens the interior and raises lighting load. We specify both numbers together.

Is solar-control glass enough, or do you need external shading too? On east and west elevations the sun is low and strikes the glass almost head-on, where coatings are least effective. That is where external shading — brise-soleil, fins, reveals — earns its place, stopping the heat outside the glass. We engineer glass and shading together to the orientation.

Can you improve the solar performance of an existing building façade? Often, yes — retrofitting external shading or re-glazing with a higher-performance solar-control unit can cut solar gain without rebuilding the envelope. We survey orientation, existing glass and structure first, then specify what actually moves the cooling load, and quote it on survey.