Trane Voyager 12 5 To 25 Tons Brochure CDQ SLB001 EN 10/07/2010 Dehumidification Cool, Dry, Quiet With Rooftop Units

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CDQ™ dehumidification

Cool, dry, quiet with Trane rooftop units

The Trane CDQ™ desiccant wheel is used to

enhance the dehumidification performance of a

traditional cooling coil. The wheel is configured

in series with the coil (see RTU Airflow Path

illustration) such that the “regeneration” side

of the wheel is located upstream of the coil

and the “process” side of the wheel is located

downstream of the cooling coil. The wheel

recirculates the water vapor trapped

downstream of the cooling coil back into

the air upstream of the coil where the coil

removes it through condensation.

This process is accomplished without the

need for a second regeneration air stream.

The addition of the CDQ desiccant wheel to

the system enhances the dehumidification

performance of the traditional cooling coil.

For units with less that 40 percent outside air,

CDQ can greatly improve the latent capacity of

the unit. This results in a lower sensible heat ratio

(SHR) without the addition of reheat.

Developed in collaboration with the U.S.

Department of Energy through Oak Ridge

National Laboratory.

Trane CDQ™ removes more water

per ton of cooling with no field

modifications.

Outside air

Mixed

air

Return air Supply air

LVG regen LVG RTU

Curb with Trane CDQ

Rooop unit

Water removed

1.8 GPH

Heat removed

46 MBH

Standard 5 ton RTU

SHR = 0.74

Water removed

2.9 GPH

Heat removed

37 MBH

Standard 5 ton RTU + CDQ

SHR = 0.74

55% more dehumidification at ARI conditions

200%

150%

100%

50%

0%

35% 45% 55% 65%

Latent capacity increase

Return air relative humidity

Latent Capacity

Benefits

• No Reheat

• Ecient, All Electric

• Cool But Drier

• Lower Dew Points

• Lower Sensible Heat Ratios

• Higher Latent Capacity

• 10 - 15dB Discharge Sound Attenuation

Part load energy savings

Adding part load humidity control will add

more energy no matter how it is done. Trane

CDQ™ diers from hot gas reheat because it

will increase the latent capacity. Reheat does

not eect the latent capacity of a unit, it simply

makes the unit run longer. Thus CDQ will run

less than hot gas reheat and produce drier air.

RTU psychrometric conditions

Water Sensible

heat

Water

removed

Standard 3-ton unit with CDQ

Sensible

heat

Water

removed

Sensible

heat

Run time

removed

40 min.

Unit SHR

.80

5.0 lbs

60 min. Unit SHR

0.73

7.5 lbs

50 min.

Unit SHR

0.66 10.3 lbs

Standard 3-ton unit with reheat

Standard 3-ton unit

Improving part-load dehumidification RTU DX unit

Run time Run time

Remove up to 200% more water vapor and drop dew points below 48°F.

Max

Min

Savings

Energy improvement

Trane RTU with CDQ vs standard RTU with reheat

Mixed air unit

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

35% 50%

Space relative humidity

Improvement @ equal

total capacity

Humidity-sensitive application

For applications requiring humidity control

24/7 and 35-55 percent RH, a Trane high-

eciency rooop unit (RTU ) with CDQ

dehumidification will:

• Allow downsizing 15-33 percent

• Improve latent capacity 40-160 percent

• Lower dew points 2-5° F

• Reduce cooling energy 10-30 percent

• Reduce reheat and total energy 30-90 percent

CDQ curbs for rooop units

To achieve these performance levels, a

high-eciency Trane rooop unit must be

used with a CDQ curb section. The CDQ curb

section is manufactured by our partner, Thybar

Corporation. The two components are designed

to go together with no field modifications

required. Together, they comprise a CDQ

system that can be used for new installations

and retrofit applications.

Ingersoll Rand (NYSE:IR) is a world leader in creating and sustaining safe, comfortable and ecient environments in commercial, residential and

industrial markets. Our people and our family of brands—including Club Car®, Hussmann®, Ingersoll Rand®, Schlage®, Thermo King® and Trane®—

work together to enhance the quality and comfort of air in homes and buildings, transport and protect food and perishables, secure homes and

commercial properties, and increase industrial productivity and eciency. We are a $13 billion global business committed to sustainable business

practices within our company and for our customers.

© 2010 Trane All rights reserved

CDQ-SLB001-EN October 07, 2010 ingersollrand.com

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