Fastlane | Products | Heat Recovery Units

Nevada
0. - 1.4 m³/s

The Nevada range of direct drive heat recovery units provide a solution for most applications which require a small unit and low air volumes and are also suitable for cooling recovery. Units are manufactured with a rigid pentapost construction and are suitable for either internal or external mounting dependant upon application. Units are available in two standard arrangements; Side by Side or Double Deck to suit space available with a selection of five standard models and a duty range of up to 1.0 m3/s.

Each standard Nevada HRU comprises of direct driven centrifugal fans for supply and extract, plate to plate recuperator, Electric Heater Battery or L.P.H.W. Coil, and G4 pleated panel filter in both airways.

The Nevada HRU range can be enhanced through a wide variety of optionalequipment to cater for customer applications including standby fans onextract, bypass dampers, silencers, control panels, washable filters andvolume control dampers.

Construction

The Nevada range offers a flexible modular construction which provides an easier on site building option. All units can also be supplied in flat-pack form where access to plant room or site location is restricted. The frame structure enables added versatility by providing hanging, stacking or joining configuration variations.

The unit has a rigid aluminium framework, with purpose built corners for added strength. Double skinned panels offer a smooth clean line with the outer panel available in Galvanised Sheet Steel or Plastisol coated steel. For ease of installation and maintenance each unit comprises slide rails and either top, bottom or side entry points offering easy access to components with minimal effort.

Performance

Flexibility in performance is achieved by the use of fully speed controllable fans which lead to added efficiency and excellent performance characteristics for air volumes of up to 1.0 m3/s.

Design

The range offers two standard arrangements; Side by Side and Double Deck and incorporate forward curved single or double inlet centrifugal fans, plate to plate recuperator, electric or hot water heating coils and pleated panel filters within both air streams. Backward curved centrifugal fans with energy efficient EC/DC motors are available. Condensation drain trays are fitted in all units and a wide range of heater output options are available. Units are acoustically and thermally lined with additional acoustic treatment available on request. Flexible in design with internal or external mounting units the Nevada range also boasts a comprehensive range of accessories including matching silencers and summer bypass dampers suitable for motorised operation.

The NEVADA units are suitable for either internal or external mounting arrangements. Although all units have pre-galvanised casings as standard, they can be supplied with plastisol coated steel outer skins upon request. Panels are flush mounted into the unit framework rebates on a crush resistant closed cell neoprene sealing gasket, which provides an air seal between the panel and the component section. Gaskets are chemically and biologically inert and meet all requirements of DW 144.

Internal Units

The standard NEVADA Air Handling units have an AA25 anodised finish extruded aluminium section, constructed from a 30mm framework with a wall thickness of 1.5mm. The mullion section is used between access panels and where panels are joined as part of the pentapost framework and is constructed to the same specification. The specially designed durable corner sections for the 30mm framework are manufactured from black high density glass reinforced nylon, providing a framework of strength and rigidity, onto which all internal components and casing panels are mounted. All access panels are held firmly in place on the framework by means of fasteners, which exert pressure evenly between the panels and sealing gasket. Access panels are lift off type with Allen key operated 'quick release' fasteners, while all other fixed panels are retained with roofing bolts, sealed using a high modulus acetoxy cure silicone sealant to BS 5889 Type B. Access panels can be hinged if required, enabling servicing of the unit without completely removing the panel. Handles are fitted to access panels for ease of handling and removal from the unit framework, which facilitates access to components for regular maintenance. N.B. Fan access and filter removal can be from top, bottom or both sides. Infill panels are double skinned, constructed from 1.0mm thick pre galvanised sheet steel to BS 2989 Z2 inner and outer skins, using a sandwich construction enclosing 25mm of 65kg/m3 mineral wool insulation, which is completely encapsulated between the steel sheets to provide acoustic and thermal insulation.

External Units

Infill panels are double skinned, the inner skin constructed from 1.0mm thick pre galvanised sheet steel to BS 2989 Z2. Outer skins, weather caps and external louvres are manufactured from 0.9mm Colorcoat HP200 material, British Steels roofing and cladding steel with 200 micrometre high performance plastisol coating, on a Galvatite hot dip zinc coated substrate to BS EN 10 147. All units are fitted with a weather guard and intake or discharge louvres incorporating bird mesh screens to protect the air inlet and discharge openings.

The fans mounted onto a diaphragm plate are double inlet double width forward curved centrifugal and housed in a purpose designed scroll with integral deep drawn inlet rings to facilitate maximum efficiency. All fans are suitable for 230V/1Ph/50Hz electrical supply. For 230V/1Ph/60Hz please enquire. The motors are isolated from the unit case via anti-vibration mounts fitted between the motor mounting arm and the fan scroll. Panel filters are 50 or 100mm deep disposable type to Grade G4, in accordance with BS EN 779 1993 (EU4). They are for side withdrawal, mounted into the unit on slide rails, which are manufactured from pre-galvanised sheet steel to enable filter replacement. Filters are manufactured from pleated media consisting of reinforced non-woven fibres, with expanded diamond grid to provide maximum support. Pleating the media increases the filtration area to more than three times that of the face area, providing high dust holding capacity and low pressure loss. The pleat pack is encased in a water resistant lattice cardboard frame.

Electric Heater Batteries (E.H.B.)

Elements are constructed from Nichrome 5 spiral resistance wire surrounded by magnesium oxide powder and sheathed in stainless steel. The elements are mounted on a galvanized sheet steel terminal housing. All electric heaters are fitted with high temperature thermal cut out protection for wiring into the control circuit. A control system must be provided to ensure the heater is not activated when there is no airflow and the fan runs on after the heater has been switched off, dissipating any residual heat. It is recommended that a fan run on timer be incorporated within the controls to prevent possible heat damage, as well as an airflow switch. Hot Water Heating

Coils (L.P.H.W.)

Coils are constructed from seamless drawn copper tube to BS 2871 mechanically expanded into aluminium fins with die formed self spacing collars. The coil casing is formed from heavy gauge galvanised sheet to BS 2989 to make a rigid assembly, with BSP(M) pipe fittings on coil flow and return connections. Tube end plates have die formed collared holes to allow expansion and contraction of the tubes without damage Coil sections are fitted into the units on pre-galvanised slide rails for ease of assembly and withdrawal. All coils are subjected to an air under water test to 17 bar during manufacture.

Plate heat exchangers are important elements in saving energy and are used in Fastlane air handling units to lower energy consumption and minimise damage to the environment. Efficiencies between 40% and 75% can be achieved depending on air temperatures and volumes through the exchanger. In the plate heat exchanger warm extract air and the cool fresh air, separated by thin aluminium plates, pass each other in cross-flow. No mixing of the two air streams occurs, preventing the transmission of dirt, odours and moisture. Heat is transmitted from extract air to fresh air by conduction as a result of the temperature difference between the two air streams. Warm extract air is cooled down, cool fresh air is heated. Plate heat exchangers can be supplied with a summer by pass damper to prevent incoming fresh air being heated by the extract air. For special applications the exchanger and casing can be corrosion protection coated or the entire unit supplied manufactured from high grade stainless steel. The plate heat exchangers have no moving parts and operation is 100% reliable.