Double Skin Air Handling Units
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- Roderick Lyons
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1 Double Skin Air Handling Units With Screwless Cabinets Engineered to Deliver High Indoor Air Quality
2 Double Skin Air Handling Units from the Experts Blue Star has over six decades of experience in offering Expert cooling solutions for a wide range of corporate and commercial applications. With this expertise and following the success of standard series of screwless air handling units, Blue Star introduces Engineered Double Skin Air Handling Units in screwless construction. These units are designed to offer customised solutions to suit individual requirements. The units are reliable, long-lasting and assure high indoor air quality. Features such as screwless and sturdy construction, low noise and compact size make these units an ideal choice for a large number of applications. DIDW Centrifugal Forward Curved Fan Copper Tubes Flexible Canvas Connection Base Frame Ultraviolet Light
3 Bag Filter Sandtrap Louvers Aluminium Anodized Frame Pre Filter Anti-Corrosive Hydrophilic Coated Fins
4 Enhancing Indoor Air Quality Blue Star has incorporated several advanced features in these air handling units. These features are optional and contribute to a great extent in enhancing the indoor air quality. Screwless Construction: Screwless design allows easy inspection, cleaning and maintenance of the smooth inner surface, thereby reducing the risk of dirt and bacteria accumulation. Moreover, there is no erosion of internal insulation material that contaminates the air stream. Horizontal DSAHU Ceiling Suspended DSAHU Vertical DSAHU The panel frame arrangement has been improved by overlapping the wedge and the special gasket. This arrangement, along with the modified filter frame design minimises the chance of air leakage. It also makes the air handling units ideal for clean room and pharmaceutical applications. Internal sheet metal, filter and coil frame can also be offered in optional Stainless Steel construction for these applications. Efficient Filters: Apart from standard EU-3 type pre-filter, various types of filters such as bag and fine HEPA Filters with different levels of filtration can be selected. These filters are of progressive density type with high dust holding capacity and with lesser pressure drop, ensuring high energy efficiency. UVC Emitters: The option of UVC Emitters inside the units is available to combat the growth of microorganisms. UVC Emitters ensure clean and sterile air at all times. Moreover, the system functions efficiently, resulting in optimum power consumption. Low Leak Dampers: Powder-coated galvanized or aluminium volume control dampers of opposed blades and in aerofoil design are provided to maintain the fresh-air to return-air ratio. A wide range of control options are available that include motorised and manual operation of the damper. The option of sandtrap louvers is also available for outdoor applications preventing sand or dust particles from entering the air handling unit.
5 Maximising Energy Efficiency With rising costs of electricity, it has become imperative to opt for additional components which keep operation costs under control. The following components also qualify the AHUs for green building applications: Heat Recovery Wheels: Current energy performance guidelines emphasise the usage of heat recovery wheels. These units utilise the energy from stale air to pre-cool the air entering the AHU. Heat recovery wheels used in air handling units recover up to 80% energy, thereby substantially reducing the operating costs. Heat Pipes: Heat pipes are used to transfer the available heat thereby reducing energy consumption and moisture content. Wrap-around heat pipes are used for pre-cooling and reheating the air, whereas heat recovery heat pipes are used for recovering the energy from exhaust air. Variable Frequency Drives: Blue Star offers Variable Frequency Drives specially customised for HVAC applications. These drives offer advanced variable speed technology which helps reduce energy consumption substantially. In new installations, a payback time of less than a year can be achieved when compared to constant volume systems. Energy Efficient Motors: Motors account for nearly two thirds of the power consumption in an HVAC application. Even the smallest improvement in motor efficiency can significantly reduce energy consumption. Blue Star offers EEF1 motors meant for continuous operation. These motors make the AHUs highly energy efficient. Energy Efficient Blowers: Energy efficient DIDW blowers have been incorporated. These are available in three types: centrifugal forward curved, backward curved or backward with aerofoil design. The option of plug fan without the belt and pulleys makes it suitable for clean room and pharmaceutical applications.
6 A Wide Range of Air Handling Units to Choose From Blue Star offers a wide range of AHUs to suit individual requirements. Standard Air Handling Units Ceiling suspended ranging from 1670 to CMH (available in 3 direct-driven and 15 belt-driven models) Vertical floor mounted ranging from 3500 to CMH (available in 10 models) Horizontal floor mounted ranging from 3500 to CMH (available in 37 models) Engineered Air Handling Units Available from 3500 to CMH Optimum Selection Blue Star has designed its own AHU selection software which is used by field engineers and is integrated in the manufacturing process. This helps in addressing customer requirements effectively.
7 Standard Superior Features of the Unit Casing The AHU is constructed on a thick fabricated GSS channel Fan and motor is mounted on a fabricated slide rail. A specially designed motor mounting base plate allows adjustment of the belt tension without disturbing motor alignment. Flexible fire retardant canvas connection is provided at the fan outlet. The coil is placed on sliding channels for ease of service and maintenance The drain pan is made up of Stainless Steel and insulated with a closed cell elastomeric insulation to avoid surface condensation Hinges and Handles The fan section is provided with an access door for ease of serviceability of the fan and motor User-friendly nylon handles can be operated from both inside and outside the casing View Port and Marine Lamp View port is provided on the fan door panel to enable monitoring the fan and motor status Marine lamp provides easy visibility Fans Centrifugal fans are of double inlet, double width type with forward curved impeller. Fans are AMCA certified for sound and air performance, and are statically and dynamically balanced. The whole fan assembly is trim balanced to match ISO 1940 & AMCA 204.G 2.5 standards. The motor is of TEFC squirrel cage induction type with IP55 protection and Class F insulation. Limit Switch Door limit switch automatically trips the motor/fan when the door is opened.
8 Double Skin Air Handling Units INTL-31-OCT 06-R0 CI For assured Indoor Air Quality. For more information, please contact BLUE STAR LIMITED, International Division, Band Box House, 4th Floor, Dr. Annie Besant Road, Worli, Mumbai India. Tel: Fax: Visit us at: or exports@bluestarindia.com 12 1
9 Blue Star is India s leading airconditioning Company, with over 6 decades of experience in providing expert cooling solutions. On offer are Double Skin Air Handling Cu Tubes Units that are developed and powered with innovative technology to provide end customers with excellent and optimized solutions. DIDW Centrifugal Following are some of the options that you can Forward Curved Fan Sandtrap choose from: Louvers Bag Filter Horizontal Floor Mounted Vertical Floor Mounted Ceiling Suspended Certificates Flexible Canvas Connection Base Frame Ultraviolet Light Aluminium Anodized Frame Anti-Corrosive Hydrophilic Coated Fins 2 Pre Filter 3
10 Product Specifications Coils Quality Assurance Primarily coils are designed for chilled water and direct expansion applications, manufactured AHUs comply with the standards mentioned below: The panel is made of Sandwich construction of 25 mm or 46 mm, injected with CFC free, from ½ OD copper tubes of staggered configuration and counter flow design. Drain Pan ISO on Quality Management System. EN 1886, EN on Mechanical and Performance characteristics. i. Casing Strength: Class 2A ii. Casing Air Leakage: Class A iii. Thermal Transmittance: Class T2 iv. Thermal Bridging Factor: Class TB2 AMCA 210 on Fans Air Flow performance and AMCA 300 Sound performance Casing Rigid frame work construction made of extruded hollow aluminium anodized profile with nylon fiber glass corner joints and reinforced internally. Optional thermal bridge frame work for fresh air application and outdoor installation ensures elimination of condensation phenomenon on frame work. R141b blended, polyurethane foam insulation having density of 40 Kg / m³ and thermal conductivity of W/m K. This provides excellent thermal insulation and sound attenuation properties. The casing panels (Inner and Outer) are constructed of zinc coated steel sheets. Options available on sheet specifications are: 0.6/0.8/1.0/1.2 mm steel sheet coated with 220 g/m² galvanized zinc (Zn) and 3% chromate. 0.6/0.8/1.0/1.2 mm steel sheet coated with 120 g/m² galvanized zinc (Zn) and pure polyester pre-painted of coating thickness 25 µm for corrosion protection. 0.8/1.0/1.2 mm aluminium sheet. 0.6/0.8 mm stainless steel sheet of grade SS-304/SS-316. The panels are removable and are fixed to the frame with self-tapping screws. Labyrinth type gasket sealing between frame and panel eliminates possibility of any air leakage. The entire unit is supported on full perimeter base frame constructed from heavy duty galvanized steel sheet. The Free Flow Fins configuration combines a mild ripple with die formed directional guide channels. These create a turbulent wiping action in the normally dead area behind the tubes. And thereby prolong the contact with cooling surface. Such advance engineering techniques allow AHUs to improve the heat transfer capability and ensure the optimum balance between a high heat transfer coefficient and a minimum pressure drop. Various circuiting methods provide more flexibility, wider selection, and unexcelled performance optimization. Mechanical expansion of tubes assure tight bonding between tubes and fins for better heat transfer. The full channel galvanized steel frame and intermediate support provides rigid frame structure. The headers are heavy section with seamless copper tubing. The end connection is made in steel pipe for a welded joint. One drain and one vent fitting are conveniently located on inlet and outlet connection. Complete coils are factory pressure tested at 325 psig compressed air under water. Coils are Drain pan with wider width and differential slope ensures complete drainage of condensate. Typically the drain pan is fabricated from 0.8 mm thick stainless steel grade SS-304 insulated with 10.0 mm close cell, cross linked, irradiated, fire retardant grade polyethylene material. Intermediate tray is provided for stacked coils to collect the condensate from the top coil. Coils with hydrophilic coating are available as an option. Pre-coated fins have distinct advantage over conventional fins because of its water shedding properties, corrosion resistance and excellent UV resistance. These properties increase coil efficiency and enhance cooling capacity. For clear room application, the optional full channel frame constructed of stainless steel SS 304 grade is available. designed for operation up to 250 psig design working pressure at 300 F. 4 5
11 Fans Filters Fans used are Kruger make, AMCA certified, The filter comprises of high quality synthetic filter energy efficient. media from FilterAir. The media is thermally All wheels are statically, dynamically and trim balanced to ISO 1940 and AMCA 204/3 G2.5 standard. The operating limit of each fan type is designed to meet the requirement of class I, II and III limit as defined in AMCA standard Bearings used are either deep groove ball bearing type with an adaptor sleeve, or spherical roller bearing type at both sides for different duty applications. Housings are fabricated from galvanized sheet steel and shaft from C45 carbon steel. Various options available on types of fans used in the air handling unit are: Fire retardant, Flexible connectors are provided between the fan discharge and main casing. Motor and Drive Package Motors used are energy efficient, totally enclosed fan cooled (TEFC) type, with IP 55 protection, Class F insulation, three phase, 50 Hz, 415 V, Squirrel cage induction motor. Dual duty, Taper lock, Split bush, are used to eliminate the re-boring and keyway problems and convenience in maintenance. Matching Wedge V belts are used for high power transmission. Various options are made available to meet the specific, customized requirements: bonded with progressive density to have high dust holding capacity and low initial pressure drop. The media is certified as self extinguishing class 2 as per UL 900. The filters efficiency is tested in accordance with ASHRAE standards. Filter media is stamped with filter class as a proof of originality. Pre-Filters The media in pleated construction is housed in galvanized/aluminium cassette type frame supported with aluminium mesh on air leaving side. Filters efficiency conforms to G3 grade, 90% down to 10 micron as per EN-779 standard. Secondary Bag Filters The synthetic media consists of strategically layered and blended melt-blown polypropylene fibers fastened to a non-shed, high density polypropylene backing. Vertical separators are incorporated into each pocket to effectively channel air throughout the media to prevent excessive turbulence and maintaining low pressure drop. F7 & F9 Filters efficiency conforms to 98% down to 3 micron and 99.9% down to 3 micron respectively as per EN-779 standard. HEPA Filters Ideal design to be used in hospitals, pharmaceutical, electronics and clean room applications. DIDW, Centrifugal Fan with Forward Curve Wheel. DIDW, Centrifugal Fan with Backward Curve Wheel. DIDW, Centrifugal Fan with Backward Curve Air Foil Wheel. Plenum (Plug) Fan with Backward Curve Wheel. Dual Speed Flame Proof Construction Variable Pitch Pulley The complete fan and motor assembly is placed on separate aluminium extruded base frame, isolated from the main unit with rubber mounts / spring isolators. Preliminary Bag Filters The pockets are housed in galvanized/aluminium flange type frame. These pockets are welded at edges into a rigid and aerodynamic shape to reduce the pressure drop. Special welded spacers ensure full media utilization. Filters efficiency conforms to F5 grade, 99% down to 5 micron as per EN-779 standard. The filter features high efficiency micro-glass paper pleated to form compact media pack. Filters are scanned for leak-free construction. The filter utilizes a continuous sheet of wet-laid micro-fiber media that is deep pleated and can operate in applications with 100% humidity. Super Flow, H13 Filters efficiency conforms to % down to 0.3 micron particle size at rated flow as per EN 1822 standard. 6 7
12 Dampers VFD Variable Frequency Drive The volume control dampers have been Fully dedicated to HVAC applications, advanced designed to provide positive control of air within the airconditioning system. Dampers are constructed from high quality aerofoil design aluminium / galvanized extrusion and suitable for flanged Heat Recovery Wheel Current ASHRAE standard recommends the 20 ~ 30 CFM per person in a conditioned room to avoid Sick Building Syndrome and maintain the High Indoor Air Quality. variable speed technology is used to bring down energy and maintenance cost. Drive includes an RFI filter, DC link coils and an in-built 2 zone PID controller. The detachable Local Control Panel makes it easy to copy programming instructions. It Following are the various parameters which can be controlled efficiently: Outside air & air mixture damper, with free cooling, free heating and enthalpy control Intake & supply fan, with two steps or inverter connection within square or rectangular shape. Blades are mainly pivoted on PVC bushes and operate through PVC gear system which is fully enclosed with the damper frame. A wide range of control options are available and include motorized and manual operation Electric Heater U shaped tubular finned heaters are used to increase surface area for effective heating. These heaters come with mounting clamp and insulated with heat shrinkable sleeve for electrical connections. Watt density of heaters is maintained at 5 watts / cm². Stale air from the airconditioned space is exhausted through one half of the heat wheel while fresh air is drawn through the other half of the wheel in a counter flow pattern thereby achieving energy recovery. Also managing savings in operation cost. Heat recovery wheels use custom made metallic honey comb matrix coated with Molecular Sieve dessicant. The heat recovery wheels used are suitable at 80% equal and both Sensible and Latent heat recovery at 700 FPM face air velocity. The rotary heat exchangers are provided with purge section to reduce the penetration of exhaust air to supply air. Non contact labyrinth seals are placed on the rotors perimeter and dividing line to provide additional protection against air leakages. has several read outs to choose from with crystal sharp display. It also has a true Hand-Off-Auto function with local and remote control. In new installation, a payback time of less than one year can be achieved when compared to constant volume systems. Intelligent Controller The Intelligent controller is a highly advanced, user friendly controller with a micro processor based program which comes with an in-built display. The Blue Star solutions for Air Handling Unit market completes the range by offering all the components like electrical panel, pressure, temperature, humidity, air quality probes, differential pressure switch, flow switch, actuators, etc required for the control system and application to meet varied customer requirements. control Water heating coil and electric heaters, with preheating management Water cooling coil Direct expansion with condenser control Direct expansion with three On/Off steps Cross-flow, rotary and double coil heat recovery unit Supply & return air filter Adiabatic/Steam humidification with On/Off or modulating control Built-in daily/weekly timer All models are network connection enabled, using RS 485 port & MODBUS protocol Heat wheels used are certified under ARI 1060 certification program. A total of 24 different pre-configured systems are available and can be selected by setting just one parameter. 8 9
13 Technical Specifications Fresh Air Intake Section with Sand Trap Louver & Pre-Filters Mixing Box Section with Pre-Filters & RA / FA Dampers Mixing Box Section with Pre-Filters & RA / EA / BD Dampers Filters Pre-Filter Section Combination Filter Section - Pre + Fine / Bag 300 mm Deep Combination Filter Section - Pre + Bag 600 mm Deep Fine / Bag Filter Section mm Deep (with Access Door) Bag Filter Section mm Deep (with Access Door) HEPA Filter Section mm Thk. (with Access Door) Cooling Coil Coil Section (1-6 Rows) Coil Section (8 Rows) Coil Section (2 - RD - Heating & 6 - RD - Cooling) Coil Section (2 - RD - Heating & 8 RD - Cooling) Electric Heater Section Droplet Eliminators (4 Pass) Heat Recovery Wheel Section Supply Air Plenum Section Fan Section - Horizontal & Vertical Discharge Fan Model (Kruger) Width Height Width Height Air Quantity AHU 2.54 m/s AHU Dimensions with 25 AHU Dimensions with 46 Section Length Filter Area Section Length Coil Area Section Length Fan Dia. mm thk. PUF Panels mm thk. PUF Panels CMH mm mm mm mm mm mm mm Sq. mtr. mm mm mm mm mm mm Sq. mtr. mm mm mm mm mm mm mm mm mm mm E E E E E E E E E E E Notes: 1. AHU with single Modular unit. 2. Please add 100 mm of extrusion length in each module. 3. Add 100 mm in the AHU height for Base channel. 4. Standard empty sections are available in sizes : 180, 319, 458, 597, 736, 875, 1014 & 1153 mm. * Specifications are subject to change due to continuous product development
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17 Length Width Height 12mm ESP 20mm ESP With 4-row Coil With 6-row Coil mm mm mm sq. m. CFM CFM KW KW Kg Kg DVW DVW DVW DVW DVW DVW DVW DVW
Indoor Air Quality. For assured. Double Skin Air Handling Units
Double Skin Air Handling Units INTL-31-OCT 06-R0 CI680512 For assured Indoor Air Quality. For more information, please contact BLUE STAR LIMITED, International Division, Band Box House, 4th Floor, Dr.
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