Features: 

Space saving Low humidity control (Below 35%RH or Lower 6C Dew-point) Double skin casing cabinet None combustion casing insulation Controller system complete set from factory Energy recovery regeneration

We reserve the right to amend in whole or in part on this marke ng brochure as per con nuous development policy without wri en expression.

Air Handling Unit

The Dehumidifica on Control Unit

Desiccant Packaged Technology: BENDIG Desiccant Packaged Air Handling Unit (DP-AHU) are intended for mass transfer of water vapor for use in desiccant dehumidi-fication and desiccant cooling equipment. For use in this broad range of applications, BENDIG has been engineered for maximum durability under operating condition serve.

BENDIG DP-AHU is particularly suited to provide independently humidity control for anywhere needed to control %RH at lower than 35%. DP –AHU is able to maintain in-door air conditions a dry and cool comfort zone suitable to the patrons of the establish-ment while avoiding the “cold and clammy” feel associated with traditional humidity con-trol via overcooling with both DX and/or CWC

Smart Energy Consumption:

When the latent load has been removed from the system and reach the control

condition, our smart SCR controller will re-duce the percentage of Electric Heater operat-ing for preserving energy consumption and maintaining occupy zone condition effectively.

Longevity:

Properly used and maintained, BENDIG DP-AHU is designed for 87,600 hours (appx. 10 years) of continuous use. This longevity sta-tistic is based on maintaining 90% minimum of full rated performance.

Desiccant Packaged Air Handling Unit from BENDIG are single sta on where provide dry‐cooling condi‐

on in occupy space. This help reduce installa on area, easy to maintenance in single source sta on, lower risk of leakage where difficult to control the dew point temperature.

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INDEPENDENT HUMIDITY CONTROL

LOW HUMIDITY CONTROL (From 35%RH to lower)

ENERGY SAVING WITH SCR CONTROLLER

DEHUMIDIFY WITHOUT RAISING SUPPLY TEMP.

2

Independent Humidity Control:

Low humidity control: (Below 35% RH)

BENDIG DP-AHU is suitable for low humidity control condition (Espectially below 35%RH). The low dew-point temperature shall be managed and removed latent heat from air steam by Desiccant wheel. AHRI-Certified Desiccant wheel consumes low energy consumption and performs precisely relative hu-midity control for the room condition. Above 35%, we are also recommend to use desiccant wheel as dry-cooling process to reduce latent heat and raise up a little bit sensible temperature to preserve energy consumption.

BENDIG DP-AHU optionally can provide direct expansion for cooling process in DP-AHU. This can help the unit eliminates limitation of cooling source from existing plant. DP-AHU can operate stand-alone with combine CDU as an optional, or chilled water coil for standard unit.

As see in the right photo the DP‐AHU com‐bine with conven on al DX system from other CDU manufacturers. Our engineers can provide stabilized controller to ensure the remains of room condi on.

Two kinds of desiccant rotors available in BENDIG DP‐AHU.

First, wound silica gel, as high performance silicagel and sec‐ond one is low‐dewpoint tem‐perature molecular sieve desic‐cant rotor.

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Energy Saving with SCR controller:

Dehumidifying without raising supply temp.

BENDIG DP-AHU standard controller combine with Smart-SCR controller, where helps reactivation side preserve energy con-sumption after air steam reach the dew-point temperature. Percentage of current supply shall be reduced dramatically until supply air dewpoint temperature is maintained. Therefore, the energy consumption shall be lower than conventional step con-troller.

BENDIG DP-AHU maintains the supply temperature by recool-ing coil. This can reduce sensible heat from desiccant rotor and make the supply air in comfort condition.

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Cooled and dry

Hot and dry air

Hot and humid

Process and standard equipment in DP-AHU

Sequence of component in BENDIG DP-AHU typically ensures easy maintenance and access to component. Every com-ponents installed follow as engineering requirement from original manufacturer. We ensure the dew point temperature in each air stage where guarantee the supply air condition to occupy zone.

The delineation show photo shown above is a configuration provide for domestic market while for the covered version is use for international market.

1 2 4 5

6 7 3

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1. Filtration section:

The following sections of filters are included in the DP-AHU standardize range:

Preliminary filters, in which the fil-tering mat is mounted in zigzag fashion. As a result, the filtering area is larger, the air flow rate is low, and the service interval for re-placement or cleaning is longer.

Medium filter optionally can be V-shape as shown in picture-1 and or

Bag-filter. They all have their individual frame and air tight seal. They are particularly recommended for installations requiring extra-pure air.

Absolute filters, with an efficiency of almost 100% as indicated by the name.

Filter bypass leakage of DP-AHU follow as EN1886: F9 class where maximize low-leakage rate of filter bypass be-tween air filter and AHU frame.

Low leak filter holding from for Single header filter with knop compression is

o p t i o n a l l y available.

2. Fan Section:

Standard fan in DP-AHU is open-wheel type AKA Plug-Fan. As shown in pic-ture-2, fan is direct-driven, easy to maintenance and High—efficiency.

3. Cooling Battery (Pre-Cooling):

Cooling coil where remove sensible load and moisture content in air steam., we can supply in 2 options, Chilled water coil and Direct-Expansion coil. We can offer copper-fin and copper tube as optional and increase special fin-coating for preventing high corro-sive condition. (see below photo).

4. Desiccant Section:

This section removes latent heat from air steam. We can provide 2 kinds of desiccant media, Wound-Silica-Gel and Molecular-Sieve desiccant. Wound silica gefl is appropriate for high temperature regeneration while Molecular sieve is suitable for low-temperature and rapid ROI.

5. Post Cooling coil:

Material and function are slightly the same as Pre cooling section but Post cooling section main function always plays as sensible load and control sup-ply air as occupy zone request.

Compression

Latch– for com‐

bine filter installa‐

on in AHU

6. Heating battery:

DP-AHU provides Electric Heater as standard product but in case of cus-tomer have another heating source such as Hot-water, Steam, Gas Turbine, it can be customized design as per your request.

7. Regeneration Fan:

DP-AHU uses Flange type motor as our standard product for Regen Fan. This help fan motor keeps away from heat load from Desiccant. then motor life time shall be longer. We can also pro-vide explosion proof fan for special use and high explosive zone follow as ATEX or IEC-EX directive (see photo below).

Smart‐SCR controller for regenera on side.

Direct‐Expansion also can be pro‐vided as cooling source for cooling rocess in DP‐AHU

6

Perfection on basis:

Unit Frame-Works:

BENDIG DP-AHU standard frame works are made SS400 grade steel profile which are in the same specification of High-rise building structure. To ensure maximum quality and last longer life-span unit operation, every BENDIG AHU also use this standard steel for unit frame-works and intermediated profile.

Controller:

Controller for DP-AHU is standard set from factory. BENDIG provide 4 safety functions to minimize heat-source risk of flammable (Heating element). Low flow, No flow, High temp cut and High temp (Heating element) cut also be provided within standard controller system in BENDIG DP-AHU.

None Combustion panel:

BENDIG DP-AHU panel thickness standard is non-combustion and asbestos free to ensure healthy and safety of everyone who involve with occupy zone. Even insulation burn, no any harmful contamination in the air steam.

Heat Source:

Standard reactivated using electric resistance(indirect), steam, (indirect) hot water coil. Additionally, waste heat may be utilized for instance condenser coil. Heating element shall be equipped with safety device as our control standard for preventing exceeding temperature limitation.

Cooling Source:

BENDIG DP-AHU is available for both Direct Expansion and Chilled water coil as cooling battery for sensible cooling only and/or cool-ing and dehumidifying process.

Desiccant wheel:

BENDIG DP-AHU is available with 3 kinds of desiccant wheel follow as below.

1. High performance silica-gel

2. Molecular-sieve desiccant rotor

3. Low temperature regeneration

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Plug and Play:

DP-AHU by BENDIG are produced as com-plete set packaged and factory tested for certi-fied performance before delivery to customer.

Both sensible and latent heat shall be tested to ensure the output of unit will meet the customer requirement.

Easily to access and maintenance:

DP-AHU provides access panel as per our standard for reducing maintenance hour where enhance any action performance relat-ing to the unit . This helps a lot for technician and staff down-time reduction.

Accuracy dew point temperature

As per packaged unit, thanks for EN1886 AHU casing leakaged rate certified from Eurovent. This helps BENDIG DP-AHU to minimize air leakaged rate where direct effected to dew-point temperature of the unit. This can ensure customer that the DP-AHU provided by BEN-DIG will perform accuracy dew point tempera-ture.

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Air Flow Heaiting Capacity Moisture Remove(CMH) Pre cooled(kW) Post cooled(kW) (kW) (kg/H) Db(Co) %RH Db(Co) %RH

1620 36.1 4 20 38.9 35 65 20 252200 49 5.4 27 52.9 35 65 20 253160 70.3 7.7 39 75.9 35 65 20 253750 83.5 9.2 46 90.9 35 65 20 255000 111.3 12.2 61.5 120.2 35 65 20 256250 140 15.3 76.8 150 35 65 20 256800 152 16.8 83.6 163 35 65 20 257250 161.4 17.8 90 175 35 65 20 257600 170 18.6 93.4 182.6 35 65 20 258500 189.2 21.7 104.5 204.2 35 65 20 259800 218.1 25 120.5 235.5 35 65 20 2511500 256 29.3 141.4 276.4 35 65 20 25

Supply airCooling Capacity Entering air

Standard Specification

Please contact your sale‐person for more customiza on or larger unit.

Informa on can be adjusted without prior no ce.

Air Flow Heaiting Capacity Weight(CMH) Pre cooled(kW) Post cooled(kW) CDU CDU (kW) mm. kg.

Pre-cooled Post cooled W H L1620 36.1 4 CDU-X-72(x2) CDU-X-16 20 800 1600 3600 8502200 49 5.4 CDU-X-94(x2) CDU-X-20 27 800 1600 3600 9863160 70.3 7.7 CDU-X-117(x2) CDU-X-28 39 1100 1600 3600 13453750 83.5 9.2 CDU-X-307 CDU-X-36 46 1100 1600 3600 14865000 111.3 12.2 CDU-X-199(x2) CDU-X-45 61.5 1400 1600 3800 19806250 140 15.3 CDU-X-250(x2) CDU-X-52 76.8 1400 1600 3800 20686800 152 16.8 CDU-X-182(x3) CDU-X-28(x2) 83.6 1400 2200 4200 24607250 161.4 17.8 CDU-X-182(x3) CDU-X-36(x2) 90 1400 2200 4200 25587600 170 18.6 CDU-X-307(x2) CDU-X-36(x2) 93.4 1800 2200 4500 29808500 189.2 21.7 CDU-X-307(x2) CDU-X-72 104.5 1800 2200 4500 31689800 218.1 25 CDU-X-250(x3) CDU-X-94 120.5 2030 2200 4800 356011500 256 29.3 CDU-X-250(x3) CDU-X-108 141.4 2030 2200 4800 3680

Cooling Capacity Matching CDU Dimension(Nominal)

BENDIG can provide air cooled condensing unit to

combine with DP‐AHU as packaged in case of chilled

water insufficient in the main system.

R‐22, R‐14a and R‐407c are available for DP‐AHU.

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1) Cooling and Dehumidifying process by cooling coil: 2) Heating and De-

humidifying process by Desiccant Rotor:

3) Sensible only Cooling

BENDIG DP-AHU reduces sensible heat and some of moisture content removed by evaporator coil in 1st stage. Next, the air shall be removed latent heat by Des-iccant Rotor(2). The final stage (3), hot and dry air shall be re-cooled again before distribute into the occupy area.

Air Side process

100% air pass Desiccant Rotor

ADP

MC

Db T.

Preserve energy consumption by portion air steam ADP

MC

Db T.

After moisture content are continuous removet from the system, the air steam shall be divided into 2 portion. Most of air still be active heating and dehumidifying process from Desiccant wheel but some of them pass through and mix the most air portion (4). Finally, air will re-cooled again and supply into the system.

4) Mixing Point:

Preserve energy consumption by Smart SCR controller ADP

MC

Db T.

Another way to preserve energy consumption for desiccant process is to reduce power consumption in regeneration side and maintain dew point temperature of process side.

5) Dewpoint control

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Energy Saving from waste energy regeneration

Comparison:

Energy Consumption

Save 25%

The comparison between low temperature regeneration (40-50C)

this energy from air cooled condenser to help system regeneration-

instead of electric heater. The energy for regeneration of this system

is waste energy from air cooled condenser. Thank for Hot-Gas re-

heat know-how to increase efficiency for DP-AHU and lower COP of

compressor in evaporator side.

Total energy consumption of DP-AHU + Energy recovery is 64.2 kW. For Standard AHU+Electric Heater is 85.2 kW. The energy saving from total energy consumption is more than 25%.

35C/65%RH 12C/98%RH

20C/48.9%RH

ADP

MC

Db T.

Dp 9C 

Psychometric Chart for DP‐AHU with energy recovery

35C/65%RH

9C/100%RH

20C/49.0%RH

ADP

MC

Db T.

Dp 9C 

Psychometric Chart for Standard AHU+Electric Heater

11

Desiccant Packaged with Energy Recovery Concept:

Reheat Coil

Energy Saving:

When Desiccant Packaged AHU corporate with condensing unit, BENDIG can manage waste energy (Heat source) from condensing unit bring back to regenerated desiccant rotor. Thanks for Hot-Gas reheating technology to reduce Electric Heater energy consumption. Normally, the regeneration tem-perature should be at least 65C. With heat-source from CDU, we can manage almost 100% of waste energy to save energy consumption from electricity.

This not only saves energy consumption from regeneration side only but also raises up COP of compressor from Evap side.

Desiccant Packaged test appa‐

ratus and corporate with hot‐

gas rehea ng CDU in Factory

Samutprakarn Thailand.

This concept reduce energy

consump on from electricity

more than 70% from total of

regenera ng consump on.

Not only save energy from

electric heater but also in‐

crease COP of CDU compres‐

sor.

CDU‐1 for precooling coil

CDU‐2 for post cooling coil

And Hot gas rehea ng.

12

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BENDIG control systems, in line with the requirements of peo‐

ple and products, provides en re so ware, hardware, engi‐

neering and solu on services including turnkey installa on of

the air condi oning systems, cabling, produc on and assem‐

bly of MCC + DDC panels and programming in hospitals, shop‐

ping centers, factories, energy plants and anyplace where

people live in. Given today's condi ons, a building automa on

system is a must in modern facili es to create a safe and com‐

fortable environment using less labour and less energy. Tem‐

perature, pressure, flow, humidity and air quality controls are

performed easily through automa on systems. This also al‐

lows the crea on of desired produc on and comfort condi‐

ons. BENDIG automa c control systems include so ware

and hardware solu ons for automa on of the ven la on sys‐

tems that are applied in new and modern as well as current

buildings.

The purpose of the automa c control systems is automa ng the

monitoring, opera on and control processes regarding the ven ‐

la on devices in the building for energy savings. It also becomes

easy for the system to integrate with the current BMS systems

through open protocols such s KNX, Lon, Bacnet, Modbus. Given

today's condi ons, an automa c control system is a must in

buildings and produc on areas to create a safe and comfortable

environment using less labour and less energy. Through Flexline

and Quickline air handling units as BENDIG, we provide advanced

technology and turnkey automa c control system solu ons. We

provide wide range of solu ons in the systems we install from the

most extreme field equipments to so ware.

Automatic controller

Quick Monitoring 

Temperature and humidity values

that are desired to reach through

redundant air handling units in your

system will be constantly monitored

therefore the new desired set val‐

ues can be provided quickly.

Product Range:

Low‐Height double skin FCU Low‐Height double skin FCU Commercial AHU

Maximum unit height 400  mm. 

Desiccant Packaged‐AHU Energy recovery ‐AHU

Integra on Air Handling Unit 

Marine Off‐shore‐AHU : M‐PTP

Packaged‐Air Cooled‐AHU Packaged Water cooled ‐AHU

Run‐Around Coil Unit

Fan coil water cooled

Roof‐Top Packaged

Explosion‐proof AHU

Quality Customs Air Handling Unit

14

Metadec Ltd.  2230 soi waddansamrong samrong nua muang samutprakarn 10270

T: 662 3941662, 7573080—2 url: www.metadec‐ahu.com

Quality Customs Air Handling Unit