Clean Room Air Handling Unit

This clean air handling unit is a terminal part of the air conditioning system, it mainly consists of supply air fan section, cooling coil (heating coil) section, different class of filter section and other functional section. It is mainly for purification, or clean room application. If there is any different requirement other than the standard product, please inform, will have customization upon request.

1 The frame & PanelsThe frame , extruded aluminum alloy or plastic-steel, gives high strength and stability, corrosion resistant coated, excellent insulation values. High density rigid CFC was pressure injected between two sheets to give high strength insulated double skin panels.  Standard panel thickness are 50~90mm with insulation density of 45kg/m3,  the interior sheet can be colored steel or stainless steel according to client’s requirement.
2  Fan & motorAll wheels are statically and dynamically balanced to ISO1940 and AMCA 204-G2.5 Standards. All fans after assembly are trim-balanced to ISO1940 and AMCA 204-G2.5 Standards. All bearings are either deep groove ball type with an adaptor sleeve or spherical roller bearings type sealed at both sides. Motors are totally enclosed fan cooled type with class F insulation to IP55 protection, standard motor is Siemens, ABB or any other appointed brand is optional.
3 Cooling & heating coil Standard coils are constructed from copper tubes mechanically bonded to aluminum fins, with threaded copper headers, all contained in a galvanized steel frame. Coil options are: 1. Anti-corrosion coated coil, 2. Steam distributor heating coils, 3. Evaporator coils, 4. Copper fins, 5. Tinned copper fins adjustment.

3 Cooling & heating coil Standard coils are constructed from copper tubes mechanically bonded to aluminum fins, with threaded copper headers, all contained in a galvanized steel frame. Coil options are: 1. Anti-corrosion coated coil, 2. Steam distributor heating coils, 3. Evaporator coils, 4. Copper fins, 5. Tinned copper fins adjustment.
4.2  Electrode humidifierConsists of electrodes, steam cylinder, stainless steel distribution pipe and electronic controls for water regulation and automatic flushing
4.3 Evaporative humidifier4.4 Air washer4. 5 Other humidifier5 Dehumidification and reheating deviceIt’s has dehumidification and reheating function in one unit, lower dew point control is realized with the support of chilled water coil and intelligent control system.
6  Heat recoveryThe following forms of heat recovery equipment can be supplied:6. 1 Plate heat exchanger6. 2 Thermal wheel recovery6. 3 Heat pipe recovery 6. 4 Coil heat recovery

7 Filters

The following forms of filter can be supplied:

7.1 Prefilters

7.2 Final filters

High efficiency compact cell filters, class H10 to H13, fixed with brackets, nuts and bolts or clamps to a heavy galvanized steel gasketed structure.

7.3  Filter option

Carbon & glass-fiber combined bag filter Camcard, chemical filter cylinders ambient filter.

8 Ultraviolet lampUltraviolet lamp only effective on the bacteria on object surface, it can be used to eliminate the bacteria on the surface of filter, coil and drain pan. C wave band 265nm ultraviolet lamp with quartz glass lamp tube of long lifetime. There is one protection switch on the access door of ultraviolet lamp, the lamp will be switched off when the door is open for safety.

9 Dampers

Damper shall have high strength extruded aluminum blade, ABS drive-gear, and shall be mounted internally / externally. The blades shall be fitted with “O”-type sealing gasket.

10 Control systemThe control system offers suitable controller as per the operation requirement with friendly operation interface, famous control components.10.1 Positive pressure ControlA. Centralized fresh air system, with air flow rate fixing deviceB. Distributed fresh air system, with inverter measurement, the air pressure is constant and air flow rate is fixed. C. Exhaust air control, interlock with the door of surgery room. 10.2  Energy saving operation A. Adopts secondary return air system, saves energy. B. Adopts VFD motor to control the air flow rate, saves energy. C.  Set the operation condition with the VFD system Control system customization is available.

AHU combination models

1 Model A

Characteristic:
The fan postposition, that all of the handling equipment are in the negative pressure section. The unit’s length is short, and convenient for installation. This scheme is applicable for the general systems which have no cleanliness request or the clean systems that the unit’s length is limited.  
As the figure shown, it is the basic model of the A combination scheme, basic function section includes: mixing box, pre-filter, main filter, cooling coil, heater, humidifier, fan and motor, etc. On this basis, users can also increase or decrease other function sections according to need.

2 Model B

Characteristic:

The fan preposition, that the main filter and other main parts are in the positive pressure section, this is advantageous to shelter the coil and drain off the condensed water. This scheme is broadly applicable for the clean air conditioning system.
As the figure shown, it is the basic model of the B combination scheme, basic function section include: mixing box, fan and motor, diffuser, pre-filter, main filter, cooling coil, heater, humidifier, etc. On this basis, users can also increase or decrease other function sections according to need.

3 Model C

Characteristic:
The fan placed in middle position, that the main filter is in the positive pressure section and other parts are in the negative pressure section. This scheme is extensively applicable for the clean air conditioning system.
As the figure shown, it is the basic model of the C combination scheme, basic function section includes: mixing box, pre-filter, cooling coil, heater, humidifier, fan and motor, diffuser, main filter and outlet section, etc. On this basis, users can also increase or decrease other function sections according to need.

4 Model D

Characteristic:
 Having supply fan and return fan, the system can realize variable fresh air flow running. This scheme is applicable for the general systems which have no cleanliness request or comfort air conditioning system.
As the figure shown, it is the basic model of the D combination scheme, basic function section include: return fan, combined mixing box, pre-filter, main filter, cooling coil, heater, humidifier, supply fan etc. On this basis, users can also increase or decrease other function sections according to need.

Table 1

Notes:  

1.  It is return air condition for the data mentioned above.
2.  Return air condition indicates: the entering air DB 27 ℃, WB 19.5 ℃ for cooling, and it is DB21 ℃ for heating.

3.  Fresh air condition (100% fresh air) indicates: the entering air DB 35 ℃, WB 28 ℃ for cooling, and it is DB-5 ℃ for heating.

4. Heating standard condition: entering air temp.: 21 ℃ DB, hot water entering temp.:60 ℃.