AHU
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The ultimate in air handling units: directly and indirectly fired Mark has developed a range of air handling units with several options for a wide variety of applications. From a simple air intake unit to a fully automatically-controlled air handling unit suitable for both indoor or outdoor use. There is a wide selection of heating systems, such as hot water batteries, gas or oil-fired modules, gas-fired make-up air systems or high performance gas-fired heating systems. Heat recovery and cooling are of course also possible. The air handling units can be for internal and external use. Mark air handling units are made from seawater-resistant aluminium panels with double-walled insulation as standard. This means lower weight and a longer lifespan. The Mark air handling unit is a highly developed, premium quality product that can be adjusted to the customer’s requirements. Features –  Air displacements up to 150,000 m3/h –  Very economical to buy and use –  Integration of high-efficiency heating m odules is possible –  Modular construction –  Easy to maintain –  Long life –  Flexible and variable – 

Construction - The air handling unit is of modular construction. - The frame construction consists of profiled closed aluminium tube profiles. - The individual cabinet modules can be installed in different ways, either in line, next to each other or on top of each other. - The tube profiles are attached to each other using plastic angled profides to create a stable frame construction. Modular construction - The individual parts of the air handling unit are quick and easy to install due to a well thought out system. - In almost every case, the modules are supplied pre-assembled. - The...

Sound and thermal insulation Sound insulation of a dividing panel (ISO 717-1:1996) Noise reduction is an important point for consideration in the design of an air handling unit. For this reason, we have opted to use a doublewalled seawater-resistant aluminium panel with 25 or 40 mm mineral wool insulation. This also results in excellent thermal insulation. A lot of attention is paid to the smooth finishing on the inside of the unit, which makes it easy to clean. See table for sound insulation values. Optimal fan power –  The heart of the air handling unit is the fan. –  Mark selects the...

Filter section To guarantee the right air quality, Mark offers a wide selection of filters. All necessary care is taken in the sealing of the filter frames and filters. Filters should be changed from the inside on the dirty side. The filter options are: – Panel filter – Bag filter short – Bag filter long – High temperature filter Special filters are available on request. Delta P filter monitoring is possible. Heating systems Mark air handling units can be equipped with various heat generators. A  Hot water battery B  Gas-fired condensing modulating high-efficiency air heater (> 106%...

Type Nominal load (upper value) Maximal power Minimal load (upper value) Minimal power Efficiency at 100% load Efficiency at min. load Burner turndown ratio Air volume, min. Air volume, max.* Hot water batteries are designed as standard in copper-aluminium. The heat exchanger connections can be fitted internally or externally. Optional: - Hot-dip galvanised - Anti-corrosion coating - Steam, thermal oil - Frost protection thermostat Gas-fired condensing modulating air heater - Modulation range 4:l/7:l - Efficiency >106% - Closed design. - Electronic ignition of the main burner. - Control:...

Burner - Gas or oil Combustion chamber - Stainless steel AISI 321 - Chrome steel (AISI 409) for the sizes 335/400 Heat exchanger - Stainless steel AISI 304 Type Nominal load (lower value) Nominal power Air volume, min. Air volume, max.* * Larger air volumes using a bypass. Direct gas-fired make-up air burner Direct gas-fired air make-up air heaters are integrated into the air handling unit. This type of air heater is suitable only if the heated air is extracted mechanically. Adjustment: modulating 20:1. MONO Type Nominal load kW (upper value) Nominal load kW (lower value) Minimum load kW...

Heat recovery Operating costs can be reduced and the environment protected by the use of heat recovery. Heat can be recovered using the following systems: Cross-flow plate heat exchanger Twin-coil heat exchanger Benefits: –  Durable, no mechanical moving parts – Reliable – Simple installation –  Separate air flows –  flow via a by-pass is possible Air –  Very economical solution for heat recovery –  Efficiency > 50% Benefits: –  Fresh air and return air can be separated spatially –  Short installation length –  Suitable for installation in existing units –  an also be used at higher...

Mixing boxes The air handling unit can be equipped with a mixing box. This box is placed between the air extraction s ection and the air inlet section. The mixing box can be fitted with servomotor- controlled dampers. Optional: – Modulating - or open/closed control –  24 V or 230 V. Cooling Direct cooling (air cooling), “DX system” Indirect cooling (water cooling), “Chiller” Adiabatic cooling, “soft cool” (optional) Indirect cooling Direct cooling Water is cooled in the cooling unit. Cold water is pumped into a cold water battery in the air handling unit. This will cool the air flow. The...