ASHRAE Design Guide For Dedicated Outdoor Air Systems (DOAS) 2017

ASHRAE Design Guide For Dedicated Outdoor Air Systems A DOAS uses separate equipment to condition all of the outdoor air brought into a building for ventilation and delivers it to each occupied space, either directly or in conjunction with local or central HVAC units serving those same spaces.

A DOAS system (1) improves humidity control, (2) reduces energy use, (3) simplifies ventilation design and control, (4) uses heating and cooling equipment that doesn’t provide ventilation and/or dehumidification (e.g., radiant panels or passive chilled beams), and (5) reduces installation cost.

You can also Read ASHRAE Design Guide for Cleanrooms: Fundamentals, Systems, and Performance

Comprehensive guidance from industry experts can simplify DOAS design, installation, operation, and management.

DOAS is growing in popularity, but is still a relatively new technology. The lack of DOAS exposure and experience means many systems designed and installed today don’t take full advantage of all the benefits DOAS can offer. consolidates existing material to focus on the major issues while referring to supplemental sources for more specialized or in-depth information.

ASHRAE Design Guide For Dedicated Outdoor Air Systems -DOAS 2017 Content

• Chapter 1: Introduction 

Definition
Reasons for Using DOAS
Applications
Role of the Designer

• Chapter 2: Outdoor Air and Load Requirements

Introduction
Outdoor Air Requirements
The Outdoor Air Design Conditions
Outdoor Air Loads
Summary

• Chapter 3: System Selection

Introduction
Common Approaches to Air Distribution
DOAS Equipment Configurations
System Selection Considerations

• Chapter 4: Detailed Design Considerations

Introduction
Codes and Standards
Air Distribution
Dampers
Dehumidification and Cooling
Heating
Air-to-Air Energy Recovery
Energy Recovery Effectiveness
Humidification
Filtration/Air Cleaning
Summary

• Chapter 5: Controls

Introduction
Control of the DOAS Unit
Humidity Control
Temperature Control
Energy Recovery Control
Frost Control
Outdoor Airflow Control
Building Pressurization Control
Sensors and Instrumentation
Building Automation
Sequence of Operations
Summary

• Chapter 6: Construction

Introduction
Construction Phase Process
Summary

• Chapter 7: Operation and Maintenance

Introduction
Documentation
Operation and Maintenance of DOAS Equipment
Case Study
Summary

•  A:Sample DOAS Installation Checklist
•  B:Sample DOAS Operational Checklist
• References

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