Rethinking DOAS: Strategies to Increase Energy Efficiency [Product Showcase]

Jul 27, 2021 | Blog Posts, Insights

Product showcase: innovative DOAS units from Petra and RenewAire optimize energy efficiency, cut carbon emissions and reduce costs. The results are a more sustainable future and a better bottom line.

PETRA

OVERVIEW

Innovative DOAS Units From Petra and RenewAire

Dedicated Outdoor Air Systems (DOAS) consist of two parallel systems:

A dedicated system for delivering outdoor air ventilation handling both latent and sensible loads for conditioning the air
A parallel system to handle the loads generated by indoor/process sources that are mostly sensible heat

DOAS units maximize energy efficiency and cost savings, particularly in the form of innovative Petra and RenewAire systems. Here we’ll take a look at each one and explain the best strategies and approaches.

Petra and RenewAire DOAS units optimize energy efficiency and cost savings

PRODUCT SHOWCASE: PETRA

About Petra

Petra was founded in 1987 with a broad vision to produce a wide variety of HVAC equipment for the global market. By 1994, Petra expanded its line of HVAC equipment utilizing some of the industries most advanced machinery, components and raw materials to achieve the highest quality and efficiency standards.

Petra offers a wide range of products, such as DOAS Units, Custom & Semicustom AHUs, Energy Recovery Units, Custom Chillers, CRAH/CRAC Units and more. Consequently, Petra established itself as a trusted manufacturer with an impressive list of clients worldwide, including within the U.S.

Petra is a global HVAC manufacturing leader

Petra Heat Recovery Dedicated Outdoor Air System (DOAS) PPH

Standard features:

3,000 to 20,000 CFM
Dedicated outdoor air
Delivers neutral air to space for ventilation year-round
Cooling efficiency up to 19 EER
Heating efficiency up to 6.5 COP
Outdoor or indoor installation
Integrated microprocessor controller for stand-alone or BMS operation
Capacities ranging from 7.5-50 tons
Refrigeration cycle changes direction depending on heating or cooling mode
Able to accommodate unbalanced airflows

Petra Heat Recovery Dedicated Outdoor Air System (DOAS) PPH

Series heat pipe optional feature:

Heat pipe absorbs energy from warm humid outdoor air
Pre-cooled air exits the first heat pipe reducing the load on the cooling coils
Over-cooled air exits the coil and is reheated to dry comfortable air from the energy recovered by the heat pipe

Optional feature: series heat pipe

On-Demand Webinar: Rethinking DOAS

Learn about the creative ways Petra is reimagining DOAS units to reduce energy use, carbon emissions and costs. This presentation will include a quick intro to Petra and their product uses, followed by an extensive dive into the ways Petra is improving DOAS design.

View Webinar

Contact Us for More Information

PRODUCT SHOWCASE: RENEWAIRE

About RenewAire

RenewAire has been a pioneer in Energy Recovery Ventilation technologies for over 35 years. Their Energy Recovery Ventilators (ERVs) improve people’s health, cognitive function, productivity and wellbeing by enhancing indoor air quality (IAQ) in homes and buildings of every type. This is done energy-efficiently, cost-effectively and sustainably via fifth-generation, static-plate, enthalpy-core ERVs and Dedicated Outdoor Air Systems (DOAS) that reuse otherwise-wasted energy to condition incoming outdoor air.

RenewAire headquarters in Waunakee, WI

RenewAire DN Series DOAS

Split DOAS units with static-plate, total energy recovery
375-4,950 CFM
Single-point connection, direct-drive EC fans, injected foam panels
Modular design

RenewAire DN Series DOAS with Integrated Refrigeration

Split DOAS units with static-plate, total energy recovery
Integrated refrigeration
375-4,950 CFM
Brushless DC compressors
EC motors on all fans
Modular design

RenewAire-DN-Series-DOAS-Integrated-Refrigeration

RenewAire RD Series DOAS

Commercial DOAS units with static-plate, total energy recovery
Bypass
Optional coils
500-4,250 CFM

View DOAS Technologies

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DOAS POWER RANKINGS

Power Rankings: DOAS Units

Below are HIGHMARK’s top five power rankings for DOAS designs. More than just efficiency, the rankings also consider maintenance, indoor air quality and controllability. They’re organized into three categories:

DOAS Design: We start with number five and work our way up to the top DOAS design
Features: We list out what’s included, and what’s not, in each design
Benefits: We explain what the benefits are of each design using this key: 1) $ = cost savings, 2) Lightning bolt: energy savings, 3) Sprout: support for the environment

DOAS Design #5

Features

100% outdoor air
No heat recovery
Hot gas reheat
Auxiliary heat in winter conditions

Benefits

DOAS Design #4

Features

100% outdoor air
Energy recovery unit with energy wheel
Return air pre-treats incoming outdoor air
Reduces size of cooling coil
Hot gas reheat
Auxiliary heat in winter conditions

Benefits

DOAS Design #3

Features

100% outdoor air
Energy recovery unit with enthalpy core
No cross-contamination
No moving parts/less maintenance
Return air pre-treats incoming outdoor air
Reduces size of cooling coil
Hot gas reheat
Auxiliary heat in winter conditions

Benefits

DOAS Design #2

Did you know? Adding a second layer of energy recovery reduces required mechanical tonnage by 17%.

Features

100% outdoor air
Energy recovery unit with two layers of heat recovery
Enthalpy core and heat pipe
No cross-contamination
No moving parts/less maintenance
Return air pre-treats incoming outdoor air
Heat pipe reduces size of cooling coil and cuts energy use for hot gas reheat
Auxiliary heat in winter conditions

Benefits

DOAS Design #1

Features

100% outdoor air
Energy recovery unit with two layers of heat recovery
Enthalpy core and heat pipe
No cross-contamination
No moving parts/less maintenance
Return air pre-treats incoming outdoor air
Heat pipe reduces size of cooling coil and cuts energy use for hot gas reheat
Condenser coil located inside the unit that releases heat into the exhaust airstream and removes the need for an additional auxiliary heat source in winter

Benefits