Custom Defense HVAC, Dust and CBRN Filtration Systems
SPECIALIST MECHANICAL ENGINEERS
TURNKEY MECHANICAL SYSTEMS/ ENGINEERING HVAC EXCELLENCE/ LIFE-SUPPORT SYSTEMS/
Specialist Mechanical Engineers (SME) is a South African company specialising in custom defense, rail and industrial heat transfer, ventilation, and air conditioning, as well as high-efficiency dust and chemical, biological, radiological, or nuclear (CBRN) filtration systems for use in adverse environmental conditions. SME additionally offers auxiliary power units/systems (APU) for specialised direct current and alternating current requirements.
SME prides itself on providing an array of qualified defense HVAC and APU systems for over three decades in numerous designs for a wide range of customers within the defense industry.
Designs include standalone/bolt-on modular or integrated systems for tanks, armoured personnel/troop carriers, and mobile and stationary support systems. Applications are extended to environmental control systems (ECS) for Unmanned aerial vehicle (UAV) ground control shelters and panel mount coolers for sensitive electronic racks and power panels.
Vehicle-Integrated Custom Air Conditioners
Systems are custom-designed with the client, considering each vehicle's specific purpose. Cabin evaporator designs include fitment options for under seats, against side walls, recessed in floor, roof-mounted and integrated into the driver's console. Form and fitment are adapted to interface with ducting, diesel burner air heaters and CBRN filtration modules. Condensers can be combined with engine cooling packs or packaged as bolt-on modules. Typical standard capacities are up to 20kW to achieve 22℃ cabin temperature in a 55℃ ambient.
Modular bolt-on APU and HVAC Systems
Many vehicles can accommodate bolt-on HVAC systems, which may require an auxiliary power unit. The APUs can be used with water or air-cooled engines, with standard or custom IP44 alternators. Service exchange of units can be within 30 minutes, while armoured steel enclosures are offered as an option and capacity designed to the requirement.
Special fresh-air filtration modules can be added for heavy-duty and dusty environments, where self-cleaning cyclone cartridges ensure 95% (or more) clean air to occupants. Similar cyclones are also used on all APUs where the dust is scavenged through a venturi on the engine exhaust system.
CBRN filtration is offered as an option with cabin overpressure control and active monitoring by the control system.
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Thermal Insulation For Vehicle Cabins and Crew Compartments
SME can offer thermal insulation for vehicle cabins and crew compartments. The closed-cell product is laminated with steam-cleanable woven skin and silicone impregnated. It is self-extinguishing with less than 1% water absorption. A reduction of 40% in heat load is achieved with 12mm thick material. It is available in white, grey and light brown/sand.
High-Efficiency Scroll Compressors
The latest technology, high-efficiency scroll compressors, and effective capacity control per load are used for HVAC systems. Evaporator integrated elements, separate heating or reverse cycle heat pump design, can supply heating. All units for defense applications are developed to operate reliably under extreme temperatures, humidity, shock and vibration and dusty environments. All units are performance tested in our climate-control room and vibration to live up to this standard. EMC is tested where necessary to ensure optimum performance and compliance with the relevant specifications and procedures.
Efficient Power Management and Communication Interface
Intelligent control allows for efficient power management and communication interface options, such as CANbus or custom protocol, to the vehicle central management system. Bluetooth and USB links enable the download of system history and error logging to reduce fault-finding time and potential downtime. The units are also electrically fully protected as per Mil-Std requirements.
Product Support, Training and Spare Parts
SME offers comprehensive product support with detailed documentation, training at the client's premises, and reliable spare parts availability for up to 15 years if required.
SME strives to deliver HVAC and APU products which are: