Project
Mechanical and Building Services Delivery
Key Challenges
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Delivering highly complex mechanical systems in a remote and climatically harsh environment
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Coordinating across multiple stakeholders and JV builders within a multi-year program
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Meeting stringent hospital HVAC, BMS, and medical gas compliance across diverse clinical zones
Outcomes
Delivered full HVAC & BMS for a remote 24/7 clinical facility
Enhanced infection control with HEPA, isolation rooms & laminar flow OTs
Optimised energy use via zoned VAV, heat recovery & smart BMS
The Client
Western Australian Country Health Service (WACHS) is one of the largest country health systems in the world, providing comprehensive health services to regional and remote communities across Western Australia.
The Karratha Health Campus serves as the flagship facility for the Pilbara region, designed to consolidate health services and reduce reliance on metropolitan hospitals. The campus includes emergency, surgical, inpatient, maternity, and outpatient care, with a focus on 24/7 operation and clinical resilience.
This project was a significant investment in regional health infrastructure by the WA Government, aiming to improve healthcare access, clinical outcomes, and long-term sustainability in one of Australia’s most challenging climates.
What we achieved with our customer
The Karratha Health Campus required a high-performance mechanical services installation capable of operating continuously in the extreme conditions of the Pilbara region. Envar Engineers & Contractors delivered a full central energy plant and building-wide HVAC solution, working closely with the design and construction team to ensure compliance with strict healthcare specifications.
Delivered in partnership with builder Multiplex and Cooper & Oxley Joint Venture, the project featured a remote Central Energy Plant equipped with four 840kW air-cooled Trane chillers and dual-fuel Bosch boilers, supporting a chilled and heating water reticulation system. This system serviced the entire hospital complex, including operating theatres, isolation rooms, ICU spaces, and support areas. More than 30 AHUs, 218 VAV boxes, CRAC units, fan coil units, and 92 exhaust fans ensured zoned climate control across all departments.
Envar implemented infection-control critical systems such as laminar flow hoods in the operating theatres, HEPA filtration modules, and containment systems in isolation rooms. Additionally, the team integrated medical gases, pneumatic tube systems, and sterile services infrastructure in compliance with hospital standards.
The Building Management and Control System (BMCS) was a key success factor. Envar designed and delivered a robust system that ensured smart integration of all mechanical systems, with energy efficiency optimised via run-around coil heat recovery systems and automated environmental control across patient care zones. The outcome was a resilient, energy-efficient, and clinically compliant healthcare facility delivered in full scope and on schedule.
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