Air Handling Units Catalogue

  • View
    183

  • Download
    13

Embed Size (px)

DESCRIPTION

ahu

Text of Air Handling Units Catalogue

ContentsIntroduction ..................................... 2 Legend ............................................ 2 Nomenclature .................................. 2 General Features ............................ 3 Component Features ...................... 3 Sections & Sub Assemblies ............. 4 Units for Outdoor Installation ........... 8 Accessories & Options .................... 8 Quick Selection ............................... 9 Motor Data ...................................... 9 Capacity Ratings ........................ 10,11 Air Pressure Drop ....................... 12 Fan Performance ....................... 13 Dimensional Data ....................... 14,15 Base Frame Details .................... 16 Coil Connection Sizes ................ 16 Coil Connection Locations ......... 17 Weights ...................................... 18,19 Guide Specifications ................... 20

IntroductionSKM Modular Air Handling (MAH) Units are designed to a high engineering standard to provide the requirements of ventilation, heating, cooling, dehumidification and air distribution to a conditioned space. MAH Units are available in 16 sizes to deliver from 1200 cfm (566 l/s) to 45,000 cfm (21240 l/s) nominal air flow rate against total static pressure upto 8.0 inwg. (2000 Pa). MAH units are applicable for indoor and outdoor installation and they are ideal for large halls, schools, offices, banks, workshops, laboratories, restaurants, cinemas, hospitals, departmental stores, mosques and super markets, etc. SKM double skin air handling units are designed to meet the Indoor Air Quality requirements as per ARI standard 62/89. SKM Modular Air Handling Units, are another premium international quality product from SKM, rated in accordance with ARI standard 430 and fully justifying our slogan :

LegendThe following legends are used throughout this manual : Amp ............. Amperes cfm .............. Cubic feet per minute DBT ............. Dry Bulb Temperature EAT ............. Entering Air Tempeature ESP ............. External Static Pressure EWT ............ Entering Water Temp. FPI ............... Fins per inch fpm .............. Feet per minute gpm ............. Gallons per minute inwg ............. inches of Water Gauge Hz ................ Hertz KW .............. Kilowatts Kg ................ Kilgrams KPa ............. Kilo Pascals lbs ................ Pounds weight l/s ................. Litres per second LWT ............ Leaving Water Temp. MBH ............ 1000 Btuh m/s .............. Meters per second OD ............... Outside Diameter Pa ................ Pascals Ph ................ Phase psig .............. pounds per sq.inch rpm .............. revolutions per minute SST ............. Saturated Suction Temp. V .................. Volts WBT ............ Wet Bulb Temperature

Built in the Gulf...for the World

NomenclatureMAH Modular Air Handling Unit 12 Nominal Air Flow Rate (cfm) / 100

MAH - SeriesPage 2

GENERAL FEATURES COMPONENT FEATURESGeneral FeaturesSKM MAH units are manufactured in modular sections. Units can be shipped fully or partially assembled to facilitate handling and lifting in case of limited access. All components of MAH are easily accessible. Different sectional arrangements & fan discharge positions are possible depending on the site constraints and requirements. MAH units are suitable both for duct connection or free discharge applications. A typical MAH Unit consists of a wide choice of a combination but not limited to the following sections, fan, cooling coil, heating coil, humidifier, filter section, heat recovery system, by-pass section, multi-zone, mixing box dampers, return air fan, plenums etc.

Internal skinInner panel skin, so called double skin [DSU] to retain the insulation, is made of galvanized steel, is easy to clean and has smooth surface. This eliminates any chance of dirt and bacteria accumulation, making SKM double skin units ideally suitable for hygienic applications, such as, pharmaceutical industries, hospitals, operation theatres and food processing industries, etc. Stainless steel inner skin [SIS] or perforated inner skin [PIS] or Aluminium inner skin [AIS] for better sound absorption characteristics are available as an option.

PaintingMAH units are supplied unpainted in a galvanized finish. Units are painted only when specified. Painted MAH units are made out of a zinc coated galvanized steel thoroughly de-greased and then phosphated before application of an average 60 micron backed electrostatic polyester dry powder coating in RAL 7032 color scheme. This finish and coating can pass a 1000 hour, 5% salt spray testing at 95F (35C) and 95% relative humidity as per ASTM B 117-95. Specify option [BEP] for painted units.

Component FeaturesCasing & ConstructionPenta-Post FrameMAH series section casings are constructed of framed modules for maximum rigidity and strength. Structure frame is made of hot dip coated galvanized steel profile so called Penta-Post which has excellent mechanical characteristics. The cross section of this profile is specially designed for this type of applications. PentaPost profiles are connected by means of special corner pieces. This frame construction gives the possibility of completely dismantling the unit sections and re-assembly at site in case of difficult access.

InsulationFor best thermal and acoustical performance, all panels and PentaPost frames are internally insulated with fiberglass having black glass tissue facing. The fiber glass insulation conforms to HH-1-545B Type 1, SMACNA standard for duct liners and ASTM-C-423 and NFPA90A and 90B standards for fire resistance. Sound absorption coefficients tested in accordance with ASTMC423 on F25 mounting are as follows :Octave Band (Hz) Coefficient 125 0.23 250 0.47 500 0.57 1000 2000 4000 NRC 0.74 0.85 0.86 0.6

Special gaskets are provided for thermal bridge protection to avoid condensation. MAH comes standard with 1 (25mm) insulation for sizes 12-150 and with 1.5 (38mm) for sizes 200-450. The density and thermal conductivity of standard insulation is 2 lb/ft (32kg/m) and 0.23 BTU.in/ft.F.h, (0.033 W/mK) respectively. The following are the optional insulation materials available in MAH units : 2 (50mm) fiber glass insulation, [2SG] with the same zspecifications as standard. 1 (25mm) or 2 (50mm) polyisocynurate board, [1SB] or [2SB] with density in the range of 2 to 3 lb/ft (32 to 48 kg/ m) and thermal conductivity of 0.16 BTU.in /ft.F.h (0.023 W/mK). 1 (25mm) or 2 (50mm) polyurethane foam injection or board, [1SF] or [2SF] with density in the range of 2 to 3 lb/ft (32 to 48 kg/m) and thermal conductivity of 0.16 BTU.in/ft.F.h (0.023 W/mK). The injection is only possible for double skin units.

PanelsAccess and fixed panels are constructed of hot dip galvanized steel conforming to JIS-G 3302 and ASTM-A-653. Access panels are provided with quick release fasteners to facilitate access to all internal components for maintenance and service. Suitable handles are provided for ease of handling. All fixed panels are bolted to the frame and provided with special gasket between panels and frames to ensure air tightness. This bolted construction makes all sections accessible from both sides.

MAH - SeriesPage 3

SECTIONS & SUB ASSEMBLIESBase FrameSince MAH is constructed from Pentapost profile, which has inherent rigidity and stability. Most sizes of MAH series (up to size 100) do not require structure steel base frame. Sheet metal frame with holes for vibration mounts are provided on each side of the unit. For larger MAH units (sizes 120 - 450), a steel structure is provided coated with galvanized primer and black enamel finish. Structural steel base frame, [SBF] for sizes 12 - 100 is available as an option. See page 16 for details. floating sub base. In order to limit transmission of noise and vibration the complete fan motor sub-base assembly is mounted on anti-vibration mounts and, therefore, it is not necessary to install external vibration mounts. Flexible connection is provided between fan discharge and casing panel to avoid transmission of vibration to the connecting duct. Motors can be provided on either right or left hand side facing the unit from return air side (see figure). Section is sized to accommodate different motor sizes depending on the actual requirement of airflow and static pressure.

Major Sections & Sub AssembliesMAH series is constructed of suitable sized casing module and following sub-assemblies:

Fan SectionFanDouble inlet double width centrifugal fans are standard supply in SKM MAH. The impellers can have forward curved [FAT] or [FADH], backward inclined [FRDH] or airfoil profile [FTZAF] depending on the requirements. [FRDH] is available for sizes 32 to 450 and [FTZAF] is available for sizes 50 to 450. All fans are belt-driven by motors with adjustable pitch motor pulleys and fixed drive blower pulleys. The impellers are keyed to the shafts. All fans are statically and dynamically balanced. SKM fans uses self-aligned ball or pillow block bearings that are greased for life. Pillow block bearings are provided with re-greasing fittings. Shafts are made of C-40 steel turned by an automatic process. Fans are selected for best sound characteristics based on maximum fan efficiency. Fans used in SKM MAH units are tested in a registered laboratory in accordance with AMCA Standard 210. Different fan positions are available depending on the requirement. Refer to dimensional data for details. Motor Handing

Options Non-standard fan size. [NSF] Spark proof fans. [SPF] Explosion proof motor. [EXM] Variable speed drive (Frequency Inverter). [VSD] Standby motor (additional) with manual change over. [MMC] Stainless steel shaft. [SSS] Extended lubrication fittings. [LFE] Polyglycoat coating on fans. [PGF] Spring vibration isolators for f