Energy performance is decided long before mechanical systems are selected — in massing, orientation, and glazing decisions made at concept design. As an energy-modeling consultant based in Jakarta, ALTA Integra models building energy performance early to test strategies, reduce demand, and target net-zero-ready outcomes before those early decisions are locked in.
Our scope covers whole-building energy simulation in EnergyPlus and IES-VE, parametric testing of orientation, glazing ratio, and shading options, load-reduction strategy comparison before HVAC sizing, and energy-use-intensity benchmarking against comparable buildings and certification targets. Modelling early means design teams can compare real trade-offs — a slightly smaller window here against a slightly larger one there — before construction documents fix those choices in place.
We validate models against measured performance where post-occupancy data exists, and align every model with the standards a project needs to meet — ASHRAE 90.1, LEED, or Greenship energy credits — so simulation results translate directly into certifiable, real-world savings.
Thermal comfort with minimal mechanical load starts with the building envelope, not the air-conditioning system. As a building-thermal-performance consultant based in Jakarta, ALTA Integra optimises massing, envelope, and orientation to control heat gain and deliver thermal comfort while shrinking the mechanical system a building actually needs.
Our scope covers solar heat-gain analysis through glazing and opaque envelope, insulation and thermal-mass strategy tuned to Jakarta's tropical climate, shading-device design (overhangs, louvres, vertical fins) sized to actual sun-path data, and envelope airtightness detailing to prevent uncontrolled heat and moisture infiltration. We test strategies against ASHRAE 55 and ISO 7730 comfort criteria, not just energy-code minimums.
Because envelope decisions are expensive to reverse after construction, we work early with architects on massing and material choices, and verify outcomes with thermal imaging and comfort measurement on completed buildings — confirming the envelope performs as modelled, not just as drawn.
Good daylighting reduces artificial-lighting energy while measurably improving occupant mood and productivity — but uncontrolled daylight brings glare and unwanted heat. As a daylight-optimisation consultant based in Jakarta, ALTA Integra balances daylight access with glare and heat control across offices, education, healthcare, and residential spaces.
Our scope covers daylight-autonomy and useful-daylight-illuminance (sDA/UDI) simulation, window-to-wall-ratio and glazing-selection studies, shading and light-shelf design to push daylight deeper into a floor plate without glare at the perimeter, and integration with electric-lighting controls so daylight-harvesting sensors dim fixtures automatically as natural light contributes. We model in Radiance, Ladybug Tools, and DIALux Evo to quantify these trade-offs before construction, not after occupants complain.
We align every strategy with LEED and WELL daylight credit requirements, and verify outcomes with on-site illuminance and glare measurement post-occupancy — confirming the daylight strategy delivers comfort and savings simultaneously, not one at the expense of the other.
Natural ventilation can deliver fresh, comfortable interiors at a fraction of the energy cost of mechanical cooling — when the airflow physics are actually modelled, not assumed from an architectural sketch. As a natural-ventilation consultant based in Jakarta, ALTA Integra designs airflow strategies that harness cross-ventilation, stack effect, and wind-driven flow for fresher interiors and lower cooling demand.
Our scope covers computational fluid dynamics (CFD) simulation of airflow patterns, opening sizing and placement studies for cross-ventilation and stack effect, hybrid mixed-mode strategies that combine natural ventilation with mechanical backup for extreme weather, and courtyard or atrium design tuned to actual wind-rose data for the site. We test strategies against ASHRAE 62.1 ventilation-rate requirements, not just qualitative airflow diagrams.
Because natural ventilation performance depends heavily on site-specific wind conditions, we validate designs against local climate data and, where a project's scale warrants it, wind-tunnel or CFD studies — confirming the strategy performs across the seasons a building will actually experience, not just an average day.
Ground temperature stays remarkably stable year-round, and geothermal systems exploit that stability to cut the energy a building spends on heating and cooling. As a geothermal-HVAC consultant based in Jakarta, ALTA Integra integrates geothermal and other low-energy HVAC strategies that use stable ground or water temperatures to reduce operational energy.
Our scope covers ground-source heat-pump feasibility and sizing, borehole-field or horizontal-loop layout coordinated with site geotechnical conditions, integration with building automation so the geothermal system works alongside conventional backup rather than in isolation, and life-cycle cost comparison against conventional HVAC to confirm the payback makes sense for a specific project. We follow IGSHPA (International Ground Source Heat Pump Association) design practice for loop sizing and thermal-response testing.
Because ground-loop performance depends on accurate soil thermal-conductivity data, we coordinate thermal-response testing before finalising loop-field size, and commission the integrated system with performance monitoring — confirming the geothermal system delivers the modelled energy savings once occupied, not just on paper.
Naturally ventilated buildings trade sealed, mechanically-controlled quiet for open connections to the outside — and without deliberate design, that openness can let in traffic noise, wind buzz, or an acoustically harsh interior. As a passive-design acoustics consultant based in Jakarta, ALTA Integra shapes the acoustic character of passive environments so naturally ventilated spaces feel calm and balanced, not merely open.
Our scope covers external noise-intrusion assessment for naturally ventilated façades, acoustic treatment strategies compatible with open ventilation paths (baffled openings, acoustic louvres, planted buffers), and interior soundscape tuning — reverberation and background-noise control — so a breeze-cooled space doesn't feel acoustically raw. We coordinate closely with our own acoustic-engineering practice so passive design and noise control are solved together, not traded off against each other.
We measure outcomes against real occupant experience — background noise levels, speech privacy, and perceived comfort — rather than relying purely on calculated predictions, because a soundscape that measures well on paper can still feel wrong in a naturally ventilated space if it isn't verified on site.
Net-zero energy isn't a single technology — it's the disciplined combination of reduced demand, efficient systems, and on-site renewables adding up to a building that generates as much energy as it consumes. As a net-zero-energy consultant based in Jakarta, ALTA Integra guides projects toward net-zero energy by combining passive design, efficiency, and renewables into one balanced performance target.
Our scope covers energy-use-intensity target-setting aligned with net-zero pathways, passive-design-first load reduction before any renewable is sized, on-site solar PV feasibility and yield modelling, and battery-storage or grid-interactive strategy where relevant. We sequence decisions deliberately — reduce demand first, then optimise systems, and only then size renewables — because oversizing solar to compensate for an inefficient building wastes capital that better envelope design would have saved.
We track progress against recognised net-zero frameworks (ASHRAE Net Zero Energy Building, WELL, and Greenship pathways) and verify actual energy performance against modelled targets post-occupancy — because net-zero is a claim that has to be proven with a full year of real utility data, not just a modelling result.