NRD-HT Series (25-127 CFM)
Refrigerated Compressed Air Dryers
The NEXT Pure-Stream NRD-HT high temp refrigerated dryer has been designed specifically for use with smaller air compressors that typically do not incorporate aftercooler. The NRD-HT dryer can accept compressed air up to a temperature of 250° F / 121° C and provides clean dry air at the outlet.
Although some liquid water is removed from the air as it gets compressed, the resulting hot compressed air is saturated with water vapor. This air cools as it flows through the plant air system. As it cools, water vapor condenses into liquid which will corrode system components and degrade the process or product using the compressed air.
The performance and capacity of a standard compressed air dryer can be significantly reduced with rising inlet air temperatures.
The NRD-HT high inlet temperature refrigerated air dryer addresses this problem by incorporating, into a highly compact frame, an air-cooled heat exchanger which cools the inlet air before it enters the drying circuit. In the drying circuit, the air is cooled further to condense additional vapor into liquid, reducing the pressure dew point of the outlet air to 50° F /10 ° C or lower. The liquid is drained and the air pre-warmed as it passes through the final stages of the dryer circuit.
Through Optimization of the critical dryer elements heat exchanger, separator and condensate removal the Next engineers developed a system that ensures highest performance at full and partial speed conditions to always protect your application.
NRD-HT Series Features
- Economical design
- Energy Savings
- Dual Sensor System
- Dew Point stability at 40° F / C
- Programmable Electronic Condensate drain
- Eco-friendly gasses and recyclable material
- Thermal Protection Switch
- Green sustainability focused R134a refrigerant
- Low pressure drops and energy efficient.
- Easy installation and start up.
- Fully adjustable and extremely durable timer drain as standard.
- Hermetically sealed compressors
- Flat plate Aluminum Heat exchangers
Controller Features
- User Friendly
- Dew point monitoring
- Drain Management
- Alarm Management
Standard Operating Voltage
- 115V / 1 PH / 60 HZ – Standard (15 to 175 CFM)
Electrical Certification
- UL, CUL
Dew point Class:
- Class 5 (ISO 8573-1:2010)
Refrigerant
- R134a
Max Operating Pressure
- 200 psig
- 14 bar
Min/Max Design Pressure
- 100-232 psig
- 7-16 bar
Inlet Air Temperature
- 140° F
- 60° C
Max Operating Temperature
- 250° F
- 121° C
Max Ambient air Temperature
- 100°F
- 38° C
Standard Outlet Pressure Dew Point
- 36 to 39° F /C
- 2 to 4° C
Connection Type
- NPT
Standard Reference Conditions
- ISO 7183
NRD-HT Series Range
Sizing:
Air flow capacity = Operating Pressure x Inlet air Temperature
NRD-HT Series Options
Condensate Management
All refrigerated dryers come standard with a durable timer drain. A truly unique Electronic “NBM” and manual “NFD” zero loss drain is offered as an option. With the zero-loss drain, condensate is collected in a chamber, segregated from the air flow. As condensate builds, it activates a drain level sensor / float within its chamber. This opens an external solenoid / float drain to evacuate the condensate, closing the valve again before any air escapes. The drain cycle continually adjusts itself to working conditions.
Electronic Zero Loss Drain
NBM-SERIES
Manual Zero Loss Float Drain
NFD-SERIES
Filtration+
NFA-SERIES
- Pre-filtration grade μm 0.01
- Post-filtration grade μm 1.0
Next’s NFA Compressed Air Filters with High Performance Elements option is critical for optimum performance and efficiency
Construction+
- TWO VALVE BY-PASS
- three valve by-pass
- rugged enclosed Skid
Region Specific Specifications
(EmEA, Latin AMERICA, Asia, Austrialla)
- Alternate Voltages :
- 230/1/50-60
- Alternate Connections
- : 2” Bsp-f TO DN200
- Region Certification
- ce, eac, ukca, csa,
Your next step toward working with NEXT Air & Gas is to contact us for a Quote. Fill out the information below and give us the appropriate information needed to get started. Be sure to fill out all the contact information and our team will reach out with any questions or concerns.
If you’d rather speak to Sales Engineering, feel free to contact us at (865) 635-8178.
Below are links to product information and brochures. Please click and download at your convenience. If you have any questions or suggestions on materials you think would be helpful, please call us at (865) 635-8178.
Principle of Operation
Moisture jeopardizes everything you want your compressed air system to do. Failure to remove this water ruins the product and fouls process. That’s why it is vital to have a reliable air treatment system in place to help protect your equipment and your operations.
Next Refrigerated Air Dryers reliably remove harmful moisture and contaminants from compressed air, helping protect your compressed air system, machinery and downstream tools.
- Saturated compressed air enters the system and is precooled in the air/air heat exchanger.
- Then, precooled air moves downstream through the air/refrigerant heat exchanger. The heat exchanger’s vertical profile design reduces condensed moisture by nearly 99% using gravitational force.
- To reliably prevent separated droplets from reentering the airstream, condensate collects in a large reservoir with subsequent recirculation where flow velocity is significantly reduced.
- Accumulated condensate is then discharged from the dryer via drain. The dried, cold process air passes back through the heat exchanger to be reheated — reducing relative air humidity and recovering up to 60% cooling capacity.
Non-Cycling dryers are ideal for running at full load because they maintain a constant energy consumption no matter the flow and air demand. Next’s NRD-HT High Temp dryers use a hot gas bypass to maintain a stable dew point in varying operating conditions and control the amount of refrigerant circulating through the dryer.
Refrigeration Circuit
- Compressor
- Fan Motor
- Air To Air Heat Exchanger
- Evaporator
- Condensate Discharge Valve
- Capilary Tube
- Dryer Filter
- Demister
- Ultra Cmpact Heat Exchanger
- Hot Gas By-Pass Valve
Open View
Reliable Design and Components
The Next NRD-HT stands for reliability for and performance. Air-cooled and water-cooled designs are available, along with a number of customization options to exactly match the application requirements. Being the most efficient system in today market, these dryers are the preferred design in the highly competitive automotive and industrial paint industry.
Vertical Heat Exchanger Design
The patented aluminum heat exchanger has been designed to offer maximum performance and minimum pressure drop. The unique heat exchanger is both an air-to-air heat exchanger as well as an air to refrigeration heat exchanger. The warm and humid air is pre-cooled by the cool dry air that is leaving the dryer, which increases efficiency.
The air-to-air and the air-to-refrigerant heat exchangers plus the demister type condensate separator are housed in a unique module. The module has a vertical flow layout ensuring a natural facilitated down flow of the wet compressed air to the condensate drain. The counter flows of compressed air ensure maximum heat transfer
Digital Controller
All models have a digital controller, with a double sensor system that keeps the dew point and condensing pressure within ideal operating parameters.
Featuring a 3-digit display for the visualization of the Dew Point temperature (in °C or °F).
Cooling
Generous sizing of the condenser unit ensures maximum performance of the refrigerant circuit and the ability to operate with changes in ambient conditions quickly. Access to the condenser for cleaning and maintenance is simple. The generous sizing of the condenser ensures maximum performance of the refrigerant circuit and the ability to operate with changes in ambient conditions.
Refrigeration Compressor
Circulation of the refrigerant in the cooling system is achieved through a variety highly efficient types of compressors; piston (reciprocating), Rotary, and Scroll type.
Hermetic Reciprocating
Hermetic compressors are dependable, cost-effective, and incredibly versatile. An ideal choice for various air conditioning applications, these compressors can withstand harsh environments and have extended operating life cycles. Whether you’re looking for a dependable unit that saves on costs or a versatile option to meet your needs.
Hot Gas bypass valve
The precise and accurate hot gas bypass valve prevents the formation of ice inside the evaporator at any load condition. The valve is set during the final test and no further adjustments are required.
Condensate Drain Controls
NRD-HT dryers are equipped with a timed solenoid condensate drain. The timed condensate drain is the most economic and efficient method of discharging unwanted condensate from compressed air systems.
Removal of condensate from compressed air systems is a critical maintenance requirement. Failure to carry out regular draining results in serious disruption to production schedules, deterioration in product quality, damage to sensitive pneumatic equipment, etc. The auto drain eliminates the risk of human error and possible costly aftermath by providing regular system drainage.
- Adjustable time scales to suit any condensate discharge times:
- ON Time: 0.5 – 10Sec
- OFF Time: 0.5 – 45Min
- Drain test switch to check functionality of unit.
- Yellow LED’s to indicate status
