Clean Resources - NEXT Air & Gas - CHD Series heatless regenerative desiccant dryers - product sheet
CHD Series HEATLESS REGENERATIVE DRYERS
40 – 5,000 CFM
Invest in Productivity and Peace of Mind In today’s demanding industrial environments, where moisture in compressed air can wreak havoc on equipment and processes, it is crucial to invest in cutting-edge technology that safeguards your operations. That’s where Next Air’s CHD Series Heatless dryers come in.
Next Air & Gas regenerative dryers are the ultimate solution for moisture control in compressed air systems. Whether you operate in manufacturing, food processing, pharmaceuticals, or any other industry relying on compressed air, our dryers provide a vital shield against the damaging effects of moisture. Our dryer series uses fully pneumatic stainless steel actuator valves rather than dated shuttle valves, allowing for flow and pressure independence. With some dryers being only region-specific, we ensured that all dryers produced by Next Air were certified with ASME, CRN, UL, and CUL certification. With industry standards of design pressure being up to 150 psig, we thought it best to invest in the technical advantages and manufacture our pressure vessels to run at 200 psig (80–1,600 CFM) as standard. Investing in our desiccant regenerative dryers means investing in reliability, productivity, and peace of mind. With our expertise and commitment to excellence, we provide you with the tools to achieve superior air quality and protect your valuable equipment and processes.
Why Dry Air?
To be used in industrial processes, compressed air must be clean and dry. Atmospheric air contains many contaminants such as dust particles, water vapor, oil, and other impurities. As air is compressed, these contaminants become more concentrated, causing a variety of problems, including equipment wear, increased maintenance, lower production
In some industries, even the smallest contaminants in compressed air can cause production problems or errors that cost thousands of dollars to correct. So dry air is absolutely critical in a modern factory. Next Air & Gas is dedicated to creating the systems needed to dry air so that your production is maximized and your costs are dramatically reduced.
efficiency, pipe and line corrosion, and other expensive headaches.
HEATLESS REGENERATIVE DRYERS | CHD SERIES | 40–5,000 CFM
Principle of Desiccant Operation The Next Air & Gas twin tower design allows for continuous adsorption of water vapor from compressed air by using our high-quality, domestically made desiccant with high crush strength and a high surface/volume ratio. Drying is accomplished by passing compressed air through one desiccant bed adsorbing moisture while the other is being simultaneously regenerated with the expanded purge air. Regeneration of desiccant is accomplished without the use of heat. The wet bed is dried by diverting a small portion of the dry air from the outlet at near atmospheric pressure. The purge flow rate is adjustable to suit the specific outlet conditions (desired dewpoint). The dry air flows in a counter direction through the wet bed, sweeping all the water vapor previously adsorbed by the desiccant. The digital controller monitors the automatic operation of the dryer and provides options for load management, fixed cycle and dewpoint-based control. Next Air & Gas ensures pressure equalization in the twin towers prior to switching. This prevents line surge and minimizes desiccant attrition. The tower being reactivated will be gradually re-pressurized at the end of its reactivation cycle before switchover takes place. Purge flow and de- pressurization are in downward direction, counter flow to the drying air flow.
Standard Features • UL and CUL electrical certifications • ASME, CRN code welded pressure vessel certification • Stainless steel angle body valves/butterfly valves • Optimal tower size for low velocities, high contact time and minimal desiccant fluidization • Tower pressure relief valves • Purge adjustment valve to control purge flow • Purge flow indicator indicates rate
• Purge exhaust mufflers with built-in safety valve • Tower pressure gauges • Stainless steel desiccant strainers, supports air diffusers to prevent channeling • Counter-current repressurization • Nema 12 electrical enclosure • Separate drain and fill port • Separate safety pressure relief valve for each tank • Fail-safe design in case of power failure • Common alarm contact
• Filtration Package • Mounted Pre & After Filter • Mounted Pre & After Filter with 3-valve Bypass • Mounted Dual Pre & After Filters with 9-valve Bypass • Touchscreen HMI 4” Controller Optional Features
• High Pressure (200 – 300 PSI) • NEMA 4, 4X, or 7 • Failure to Switch Alarm • Stainless Steel Tubing • Demand Cycle Control with Dewpoint Display • Low Ambient Package
Consult factory for additional options
HEATLESS REGENERATIVE DRYERS CHD SERIES | 40–5,000 CFM
Product Specifications
CHD Series Specifications
Technical Overview
Inlet Flow Capacity (cfm @100 psig)
Dimensions (in) (W x D x H)
–40° F
Standard outlet dewpoint: Standard operating voltage:
Model
Port Size
Weight (lbs)
120V/1PH/60Hz
0.01µm
Pre-filtration grade: Post-filtration grade:
CHD-40
40
.75” NPT
300
30x26x63
1µm
CHD-60
60
.75” NPT
360
30x26x67
Standard Standard Standard Optional Standard Optional
Nema 12:
ASME certified vessels:
CHD-80
80
.75” NPT
450
30x26x84
CRN Certified Vessels (80–3000cfm): CRN Certified Vessels (>3000cfm)*:
CHD-100
100
1” NPT
450
30x26x84
cUL & UL control panel:
CHD-125
125
1” NPT
450
30x26x84
CSA control panel:
CHD-150
150
1” NPT
650
34x26x85
40° F/120° F
Min/max inlet air temperature: Min/max operating pressure:
CHD-200
200
1” NPT
650
34x26x85
80 psig/150 psig 15% * Selected provinces only
Average purge air:
CHD-250
250
1.5” NPT
675
39x26x86
CHD-300
300
1.5” NPT
1,250
39x26x86
CHD-400
400
2” NPT
1,250
44x26x87
CHD-500
500
2” NPT
1,250
47x26x88
How to Find Air Flow Capacity
CHD-600
600
2” NPT
2,900
47x26x88
Air flow capacity = Nominal capacity of dryer x Factor F1 x Factor F2 Example: A CHD-500 has a nominal capacity of 500 SCFM. What is the maximum allowable flow through the dryer at following operating conditions? Air Inlet Pressure: 110 PSIG (7.6 BARG) F1 = 1.04 Air Inlet Temperature: 105° F (40.50° C) F2 = 0.93 Air flow capacity = 500 x F1 x F2 Air flow capacity = 500 x 1.04 x 0.93 = 483.6 SCFM This is the maximum air flow rate that dryer can accept under those operating conditions. How to Select a Suitable Dryer for a Given Capacity Minimum Std. Air Flow = Design Air Flow / Factor F1 / Factor F2 Example: Given the operating parameters below, find a suitable dryer.
CHD-800
800
3” FLG
2,900
66x40x97
CHD-1000
1,000
3” FLG
3,900
66x40x97
CHD-1250
1,250
3” FLG
3,900
66x40x97
CHD-1500
1,500
3” FLG
4,985
66x40x97
CHD-2000
2,000
4” FLG
4,985
84x59x115
CHD-2500
2,500
4” FLG
7,900
84x59x115
CHD-3000
3,000
6” FLG
7,900
103x70x137
CHD-3500
3,500
6” FLG
9,500
Contact Factory
CHD-4000
4,000
6” FLG
9,500
Contact Factory
CHD-4500
4,500
6” FLG
12,500
Contact Factory
CHD-5000
5,000
6” FLG
12,500
Contact Factory
Capacity Correction Factors for Differing Operating Pressure
Operating Pressure
PSIG 50 60 70 80 90 100 110 120 130 140 150 175 200 225 250
Design Flow Rate: 950 SCFM Inlet Air Pressure: 110 PSIG Inlet Air Temperature:105° F
Factor
0.56 0.65 0.74 0.83 0.91 1.00 1.04 1.08 1.12 1.16 1.20 1.29 1.37 1.45 1.52
F1 = 1.04
F2 = 0.93 Minimum Std. Air Flow = 950/1.04/0.93 = 982.22 Therefore the model suitable for the conditions above is CHD-1000.
Capacity Correction Factors for Differing Inlet Air Temperatures
°F
70
80
90
100
105
110
115
120
Factor
1.12
1.10
1.06
1.00
0.93
0.86
0.80
0.75
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v1.6 8-17-2023
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