Complying with ASHRAE Guidelines for Indoor Air Quality during COVID-19
HVAC systems’ operation is a critical requirement for reopening and maintaining adequate safe indoor air quality (IAQ). The ASHRAE Epidemic Task Force developed guidance to help facility managers improve indoor air quality to slow the transmission of viruses via the HVAC system. Belimo has reviewed the ASHRAE Epidemic Task Force recommendations and developed a checklist to evaluate field devices’ operation. Non-functioning devices can be retrofitted to meet the indoor air quality requirements of the ASHRAE reopening guidelines.
|Improve Occupant Safety||Increase Ventilation||Ensure Proper Flow|
Verify Indoor Air Quality
Sensors that are faulty or out of calibration affect the ability to control temperature, humidity, air quality, and building pressure. Sensors must be verified for operation and accuracy to improve system performance and ensure occupant safety, comfort, and productivity.
Inspect and confirm the operation of the BAS humidity sensors. If using resistive type humidity and dew point sensors, consider changing to capacitive technology (CMOS) sensors, which are more accurate and not susceptible to drift. The updated ASHRAE 62.1 standard also requires systems to limit the indoor humidity to a maximum dew point of 60°F (15°C) during both occupied and unoccupied hours, whenever the outdoor air dew point is above 60°F (15°C). Belimo’s field selectable multi-sensors measure: temperature, RH, dew point, enthalpy, and absolute humidity.
Belimo sensors offer superior reliability, easy installation, and seamless integration with major Building Automation Systems (BAS). We offer a complete range of sensors to measure temperature, humidity (relative humidity, absolute humidity, enthalpy, and dew point), pressure, CO2, and volatile organic compounds (VOCs).
Improve Occupant Safety
Facility operators and building owners need to evaluate their building systems to ensure they meet ASHRAE guidelines. Strategies such as improve occupant safety, comfort, and productivity. Every HVAC system needs to be analyzed to ensure appropriate measures are taken to enhance the ventilation and reduce virus transmission in the building.
If any of the above cannot be met – retrofit the damper with properly sized actuator and linkage solutions. The Belimo Retrofit App or SelectPro are quick and simple tools for accurately sizing and selecting valves, actuators, sensors, and replacement solutions. Belimo offers a full range of damper actuators, sensors, and economizer solutions along with standard or custom linkages. With a wide variety of controls signals and torque ranges, we can ensure your control dampers will operate with maximum reliability and high performance.
Studies have shown, up to 70% of economizers are not functioning correctly. Many times economizer systems are not set up correctly or are left to operate in factory default mode. Economizer failures generally do not result in comfort problems; many failures go undetected. These problems persist, causing poor filtration, ventilation, and inefficient air exchange resulting in poor indoor air quality. Meanwhile, energy standards and building IAQ requirements are not being met.
If an economizer is not functioning properly or capable of meeting ASHRAE recommendations, replace it with the Belimo ZIP Economizer - the fast track to better IAQ. The ZIP Economizer is the most technologically advanced airside economizer solution on the market. The ZIP Economizer provides the highest energy savings through advanced economizer logic strategies and is compliant with the current energy codes and standards (ASHRAE 90.1, IECC, California Title 24, ASHRAE 189.1).
Ensure Proper Flow
Belimo valve assemblies and valve actuators are recommended replacements for failed or damaged components to improve occupant safety, comfort, and productivity. A poorly functioning HVAC system can be transformed into a safer system while minimizing operation costs.
Verify control valves operate correctly by checking the valve stokes and ensure the selected signal, whether on/off, floating, or modulating, is working accurately.
Verify the design flow requirement with a strap-on ultrasonic meter or with another measurement device.
Override the valve position with the DDC system and verify that the feedback is tracking the signal.
Change setpoint through the BMS or the thermostat to verify proper operation.
Inspect the valve stem for leakage.
Close the valve, and confirm no fluid is passing through the valve seat by using a measurement device.
Make sure the direction of the flow is correct and not reversed.
Ensure that you have enough pressure drop across the valve using differential pressure sensors or other measuring devices.
Verify water quality and remove any air bubbles from the installation.
If a replacement is needed, Belimo offers a full range of valve actuators, valve assemblies, piping packages, and pipe sensors to meet your needs. If you need technical expertise, contact a Belimo Regional Application Consultant.
Webinar: Belimo Solutions to ASHRAE’s 62.1 Update: Dew Point vs. Relative Humidity
ASHRAE recently updated the 62.1 guidelines, now recommending controlling humidity based on dew point instead of relative humidity. Join us as we speak about the differences between relative humidity and dew point, and how these values affect your facility’s overall humidity levels.
Reopening Facilities & Maintaining Proper IAQ Levels to Minimize Airborne
ASHRAE recently released guidelines on how to reopen facilities while maintaining proper IAQ (Indoor Air Quality). Recorded webinar on the importance of IAQ and how it relates to occupancy health and safety. In this webinar will explained how to utilize Belimo’s ZIP Economizer and Belimo’s Sensors to ensure that occupants are being protected while trying to minimize airborne virus exposure.
Influence of Indoor Air Quality on Our Health
People spend approximately 90 percent of their time indoors and breathe 12,000 liters of air per day. Therefore, it is crucial to understand the powerful influence that indoor air quality has on our well-being, especially during this extraordinary time of the coronavirus pandemic.