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AHRI MENA, ASHRAE RAL Energy Efficiency Webinar recording now available

DUBAI, UAE, 3 June 2022: AHRI MENA said a recording of the May 18 AHRI MENA, ASHRAE RAL Energy Efficiency Webinar is available for public viewing. AHRI (The Air-conditioning, Heating, and Refrigeration Institute) and the ASHRAE Region-At-Large (RAL) Chapter conducted the webinar, titled Raising the Bar of Energy Efficiency in High Ambient Temperature Regions.

With more countries in the Middle East and North Africa (MENA) region facing mounting environmental challenges, the webinar provided attendees with insight into regulations, energy performance standards, and building codes aimed at improving energy efficiency and supporting ambitious green targets, AHRI MENA said.

Khalil Issa, AHRI MENA Executive Director and Nabil Shahin, Technical Director, discussed key drivers for facilitating compliance with minimum energy performance standards (MEPS) and green building codes, principally the AHRI Performance Certification Program, which uses independent, third-party testing to accomplish that goal.

ASHRAE representatives, Richie Mittal and Dr Samir Traboulsi discussed global and regional regulatory and energy efficiency issues and introduced ANSI/ASHRAE/IES Standard 90.1. Considered the gold standard for energy efficiency, Standard 90.1 was examined in terms of its structure and compliance mechanisms in the context of ASHRAE 189.1 and the International Green Construction Code standards.

“With AHRI’s product performance and rating standards being intrinsically referenced in green building codes and ASHRAE 90.1, only AHRI certification allows the proper verification of equipment efficiency and serves as the best path for regulatory code and MEPS compliance,” Issa said.

AHRI MENA said a recording of the webinar is available here. It suggested to visit the website to learn more about AHRI MENA.

ASHRAE Epidemic Task Force releases updated Building Readiness Guide

ATLANTA, Georgia, 02 February 2021: With the performance of many HVAC systems in buildings still being evaluated, the ASHRAE Epidemic Task Force has updated its reopening guidance for HVAC systems to help mitigate the transmission of SARS-CoV-2, ASHRAE said through a Press release.

“The Building Readiness Guide includes additional information and clarifications to assist designers and commissioning providers in performing pre- or post-occupancy flush calculations to reduce the time and energy to clear spaces of contaminants between occupancy periods,” said Wade Conlan, Lead, ASHRAE Epidemic Task Force Building Readiness team. “New information includes the theory behind the use of equivalent outdoor air supply, method for calculating the performance of filters and air cleaners in series, and filter droplet nuclei efficiency that help evaluate the systems’ ability to flush the building.”

According to ASHRAE, major updates to the building readiness guidance include the following:

  • Pre- or post-flushing strategy methodology: The strategy has been updated to include the use of filter droplet nuclei efficiency, which is the overall efficiency of filter, based on viable virus particle sizes in the air, to assist in determining the impact of the filter on the recirculated air on the equivalent outdoor air. This allows the filter efficiency as a function of particle size, using ASHRAE Standard 52.2 test results, to be estimated based on the expected size distribution of virus-containing particles in the air. This calculation is currently based on Influenza A data and will be updated as peer-reviewed research becomes available for the distribution of particle sizes that contain a viable SARS-CoV-2 virus. Additionally, a chart has been added to help determine the time to achieve 90%, 95% or 99% contaminant reduction, if the equivalent outdoor air changes per hour is known.
  • Flushing time calculator: There is now a link to a view-only Google Sheet that can be downloaded for use, to help determine the available equivalent outdoor air changes and time to perform the flush. This sheet is based on a typical mixed AHU with filters, cooling coil, with potential for in-AHU air cleaner (UVC is noted in the example), and in-room air cleaning devices. Provided efficiencies of MERV-rated filters are based on the performance of over 200 actual filters from MERV 4 through 16, but the tool also allows users to enter custom characteristics for specific filters.
  • The sheet also calculates the filter droplet nuclei efficiency, based on the cited research but allows a user to adjust the anticipated distribution of virus, as desired. It also allows specification of the zone (room) air distribution effectiveness from ASHRAE Standard 62.1 to account for the impact of the HVAC system air delivery method on the degree of mixing. Default calculations assume perfect mixing. Finally, the tool allows for the target air changes to be adjusted if an owner wants to achieve a different per cent removal in lieu of the recommended 95%. 
  • Heating season guidance: The guide now includes data to consider for heating of outdoor air and the potential impact on pre-heat coils in systems.
  • Adjustments to align with Core Recommendations: The Core Recommendations were released in January 2021, and this guidance document needed to be updated to ensure that the information provided aligned with the intent of those recommendations. This included minimum outdoor air supply and filter efficiency requirements and their role in an equivalent outdoor air supply-based risk mitigation strategy.

According to ASHRAE, the guidance still addresses the tactical commissioning and systems analysis needed to develop a Building Readiness Plan, increased filtration, air cleaning strategies, domestic and plumbing water systems, and overall improvements to a system’s ability to mitigate virus transmission.

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