RenewAire DN Series DOAS: Energy Recovery Ventilation

SÉRIE DN DOAS

DEDICATED OUTDOOR AIR SYSTEMS AVAILABLE WITH REFRIGERATION AND PACKAGED ENERGY RECOVERY

Key Features:

• Total energy recovery units via static plate
• 375-4,950 CFM
• Single point connection, direct drive EC fans, injected foam panels
• Modular design
• Low dew point air supply
• Ventilation solutions

Image: A large, multi-sectioned outdoor air handling unit.

Image: Exterior view of a modern medical facility with "OUTPATIENT" and "SURGERY" signs.

VENTILATION SOLUTIONS FOR EVERY APPLICATION

Understanding Indoor Air Quality (IAQ)

Poor indoor air quality is a significant threat, as buildings become more airtight, trapping contaminants like furniture emissions, excess humidity, odors, cooking fumes, CO2, and more. Insufficient IAQ can lead to health issues, impaired cognitive function, structural damage, and reduced productivity. People spend approximately 90% of their time indoors, where indoor air can be two to five times, and up to 100 times, more polluted than outdoor air. The EPA ranks indoor air pollution among the top five health risks.

Benefits of High-Quality Indoor Air:

• Health: Reduces allergies, headaches, asthma, respiratory issues, and more serious conditions.
• Cognitive Impairment: Lowers CO2 levels, improving thinking and decision-making.
• Disease Transmission: Dilutes airborne contaminants, reducing the spread of illnesses.
• Productivity: Enhances worker performance and reduces sick days.

Ventilation can improve IAQ and reduce the transmission of airborne infectious diseases, including COVID-19. [Link: BIT.LY/COVID19WP_22]

Diagram: Illustrates how fresh air enters and stale room air exits without mixing through a separation plate.

ASHRAE Building Codes and Standards

RenewAire technologies help meet and exceed ASHRAE standards for IAQ and energy savings, promoting healthier buildings and occupants.

• ASHRAE Standard 62.1: "Ventilation for Acceptable Indoor Air Quality" - ERVs play a key role in creating cleaner indoor air while optimizing energy efficiency.
• ASHRAE Standard 90.1: "Energy Standard for Buildings Except Low-Rise Residential Buildings" - ERVs are often required based on climate zone and outdoor air percentage.

RenewAire Ventilation Solutions Enhance Health and Well-being

RenewAire ERV Technology

Core Technology:

• Certification: AHRI certified for low to zero exhaust air transfer ratio. Meets UL-723 and UL-1812 flammability standards.
• Maintenance: Cores are easy to clean without removal and never require washing.
• Innovative Construction: Cellulose-based core material, no halogenated flame retardants or PVC. Galvanized steel frame.
• Reliability: 10-year structural and performance warranty on static plate core; 2-year commercial, 5-year residential product warranty.
• Exceptional Performance: Moderates heat and humidity via total energy recovery. No frost protection or condensate pans needed. Laminar airflow prevents particle buildup.
• Reduced Costs: Optimized energy efficiency lowers ventilation energy needs, reducing heating and cooling demands.

RenewAire ERVs Temper Air:

Our ERVs moderate outdoor air temperature and humidity extremes year-round, providing a sustainable ventilation solution for any climate.

SUMMER: Warm, humid outdoor air is pre-cooled and dehumidified by exhaust air.

WINTER: Cold, dry outdoor air is preheated and humidified by exhaust air.

DN Series: Dedicated Outdoor Air Systems with Energy Recovery

DOAS: Decoupling Outdoor and Indoor Air Loads

Commercial buildings require outdoor air for ventilation and IAQ. Incoming ventilation and makeup air typically represent over 80% of a building's dehumidification load (ASHRAE). Decoupling outdoor and indoor air demand allows each system to operate independently, reducing ventilation energy consumption. Dedicated Outdoor Air Systems (DOAS) efficiently bring dehumidified outdoor air indoors to improve IAQ and thermal comfort.

A DOAS uses separate equipment to condition the outdoor air brought indoors for ventilation, distributing it to each occupied space. This can be done directly or in conjunction with HVAC units serving those zones, optimizing operational efficiency.

Diagram: Shows the flow of outdoor air, return air, and supply air in a Dedicated Outdoor Air System.

DOAS Advantages:

• Improved humidity control
• Simplified ventilation design and control
• Reduced energy consumption
• Lower installation and energy costs
• Optimized operational efficiency
• Enables use of heating and cooling systems that do not provide ventilation/dehumidification (e.g., radiant panels, chilled beams, VRF).

Traditional Design Problems & Solutions:

• Terminal Systems (VRF, Chilled Beams): Cannot handle outdoor air humidity load. DOAS manages this load, allowing terminal systems to handle internal loads.
• VAV Systems: Modulate airflow. Mixed air in central systems may not guarantee outdoor air supply. DOAS provides a dedicated 100% outdoor air supply.
• Outdoor Air: Modern designs require variable outdoor air, which central systems may not accommodate. DOAS can manage this variability.
• Conventional Systems: Do not decouple sensible and latent loads. High indoor humidity can result. DOAS can handle 100% of the latent load and part of the sensible load.
• On-Site Installation (Split Systems): Require certified technicians, risk leaks, need considerable maintenance, and have high upfront costs. Integrated DOAS with built-in refrigeration avoids these issues.

Diagram: Compares a conventional HVAC system with a DOAS, showing airflows.

Code Requirements for Energy Recovery in DOAS:

Specific codes require DOAS products to provide 100% outdoor air. Integrating energy recovery is often mandatory. ASHRAE 90.1 and IECC mandate a minimum of 50% total efficiency for the energy recovery component. Energy recovery is one of the best ways to improve building energy efficiency.

[Link: DOAS: HTTPS://BIT.LY/3ZTJGFN]

Green Building Trends:

High-performance green building standards aim to reduce energy consumption and increase ventilation for better health, IAQ, and indoor environmental quality (IEQ). Sustainable design initiatives like ASHRAE 189.1, LEED, and WELL Building Standard are gaining popularity. RenewAire's technologies create healthier, more comfortable indoor environments while optimizing energy efficiency by reusing exhaust air energy to condition incoming outdoor air, resulting in exceptional IAQ, IEQ, energy reductions, and cost savings.

Image: A diagram showing different application strategies for DOAS units, including direct-to-zone with terminal units, rooftop units, and air supplied to terminal unit air intakes. It also shows various configurations of ERV units with optional heating/cooling modules.

DN Models at a Glance

Application Strategies:

• DOAS Direct to Zone with Terminal Units: Variable refrigerant flow, fan coils, heat pumps.
• DOAS Direct to Zone with Rooftop/Central AHU: Rooftop/Air Handling Unit.
• DOAS Air Supplied to Terminal Unit Air Intakes: Variable refrigerant flow, fan coils, active chilled beam.

Unit Specifications:

• Cooling Section: Direct expansion (DX R410a, R454b or R32), chilled water, heat pump (optional).
• Heating Section: Electric (SCR), indirect gas-fired (5:1, 10:1 modulation), hot water, heat pump, steam (optional).
• Hot Gas Reheat: Modulating (optional).
• Economizer/Defrost Capability: Modulating.
• Controller: Integrated programmable controller (Carel c.pCO mini).
• Optional Control Communications: BACnet MS/TP or IP, Modbus RTU or TCP.
• Airflow Monitoring: Yes.
• Recirculation Mode: Yes (optional).
• Power Outlet with GFCI: 120 VAC, 20A (field wired).
• Roof Curbs: 14" height.
• Seismic & Wind Baffles: Yes.
• Filters: MERV 8 (2" only), 13 and 14.

Fan Motor HP (kW):

Unit ESP:

• 2" WC at 1,500 CFM
• 2.5" WC at 3,000 CFM
• 3" WC at 4,500 CFM

Modular Design Options:

ERV Only, ERV + EH, ERV + GH, ERV + CC/HC (BT), ERV + CC, ERV + CC/HC (DT), HGRH+, ERV + CC + EH (BT), ERV + CC + GH (BT), ERV + CC + HC (BT), ERV + CC + HGRH+ EH (BT), ERV + CC + HGRH + GH (BT), ERV + CC + HGRH+ HC (DT), ERV + CC + EH (DT), ERV + CC + GH (DT), ERV + CC + HC (DT)

Key: ERV - Energy Recovery Ventilator, EH - Electric Heat, GH - Gas Heat, CC - Cooling Coil, HC - Heating Coil, BT - Blow Through, DT - Draw Through, HGRH - Hot Gas Reheat

Design Benefits:

• Designed for high-performance buildings
• DOAS manages external and internal loads with low dew point supply air conditions
• Reduced investment, installation, and operating costs

Image: A series of diagrams illustrating different modular configurations of RenewAire ERV units with various heating and cooling components.

Maintenance is Simple:

Disposable filters should be checked and replaced as needed. Annually, vacuum the four faces of the core with a soft brush. The RenewAire core does not require washing as particles do not accumulate within the core.

Why Energy Recovery is Essential

Decarbonization and Energy Efficiency Requirements

The primary responsibility of a 100% outdoor air unit is to dehumidify incoming air. This process inherently manages significant heating and cooling loads. Adding energy recovery significantly reduces these loads and the HVAC equipment needed to condition the air.

ASHRAE Standard 90.1-2010 requires the use of energy recovery based on unit airflow, outdoor air percentage, geographic location, and operating hours. The standard mandates a total efficiency (sensible and latent) of at least 50% where necessary. Energy recovery device efficiency varies by type, material, and airflow balance.

Diagram: A map of the United States showing different climate zones (1-8) relevant to energy efficiency standards.

Outdoor Air Percentage at Full Load Airflow (CFM) by Zone:

RenewAire Ventilation Solutions Increase Monetary Benefits

Accessories

Heaters:

• EK Series Electric Duct Heater (for indoor units only)

Borders & Clips:

• Border Clip Kit
• Roof Border

Filters:

• 2" or 4" MERV 13, 14 Filters

Controls:

• Wall-mount CO2 Sensor
• Wall-mount IAQ Sensor
• Duct-mount CO2 Sensor
• In-duct Temperature Sensor
• Ambient Temperature and Humidity Sensor
• Ceiling-mount Occupancy Sensor
• Wall-mount Occupancy Sensor
• In-duct Static Pressure Sensor (Wall/Duct Mount, Screenless)
• Wall or Duct Mount Static Pressure Sensor with Display
• Duct Mount Smoke Detector
• Remote Display (Portable or Wall Mount)

Coil Accessories:

• Negative Pressure Waterless Purge
• Positive Pressure Waterless Purge

Image: Various accessories including heaters, border clips, filters, sensors, and controllers.

RenewAire: Energy Recovery Ventilation

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