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Midea conference highlights its V8 VRF system

DUBAI, UAE, 1 June 2022: Midea launched the VRF V8 series as a major global initiative, citing Dubai as the best place to demonstrate the toughness and reliability of the system in facing up to sandy and dusty conditions and to high relative humidity and high temperatures. It said the V8 can work in temperatures ranging from 55 degrees C to minus 30 degrees C, making it ideal for operations in the UAE and Saudi Arabia, characterised by high temperatures, including higher ground temperatures.

Henry Cheng, General Manager, Midea Building Technologies, said the V8, which will go into production this month, is about reliability. “We want the product to be more reliable, so there is no need to repair it or spend that much time on maintenance,” he said. He spoke of the V8 having innovative features, including its shield box, which protects the incorporated printer circuit board (PCB) from getting affected by the outside environment, including sand, dust and moisture. “Water will damage the PCB, if it touches,” he said. “The PCB is in an isolated space, and no water will touch it. So, it can work safely for a longer time.”

Speaking on the other features, Cheng highlighted the V8’s hyperlink approach to connecting the wires. Elaborating on how in the past, installers had to connect the wires in series, he highlighted the inherent disadvantage of that approach, where if one unit stopped working, the entire system would stop working. The V8, he said, allows for the wires to be connected with greater flexibility, which improves reliability, eases the installation process and helps installers save time. A third feature of the V8, he said, is the high degree of comfort it allows through its constant airflow. “No matter where you are in the building, the airflow is constant,” he said.


Cheng also spoke of the V8 having 19 sensors and a visual sensor technology. If the real sensors stop working, the machine will duplicate to give virtual sensors – digital twin – which will continue the sensing process and simultaneously send a message to the maintenance personnel informing them of a problem with the real sensors for them to rectify. “This way, the system is able to work 24×7, so there is no shut down problem,” he said. He also spoke of the V8 featuring the ‘Midea Doctor 2.0, which would allow for using cloud for self-diagnosis. “So, with the V8, we have many leading technologies in the industry,” he said. “With the V8, we are the leader in the product.”


Addressing the issue of aftersales service, Cheng said Midea works closely with its partners, including Taqeef, which he added has a strong aftersales capability, including training and service centres.

“We also support our partners in increasing their aftersales service,” he said. “We have our technical engineers to support Taqeef, and we provide funds to partners to improve their service capability. As Midea we also have the TSP feature, and so partners can place orders for spare parts through the TSP and also through the cloud. So, we are enhancing our capabilities on aftersales. But, if we have a highly reliable product, you don’t need as much aftersales. We use high-end components, so we have fewer problems, and we would need less aftersales service.”


Cheng said Midea would continue to invest in the GCC region. But when asked if the company has plans to open a factory in the Middle East, he said it does not have any at the moment. “We have to look at the right partners and at the policies from the government,” he said. “We have had a discussion on this with the Abu Dhabi Investment Office.


Tariq Al Ghussein, CEO, Taqeef, speaking on Midea’s global growth, said that the very fact that the company has changed its name from Midea CAC to Midea Building Technologies reflects its ambition to provide comprehensive solutions to the building construction industry, including HVAC and elevators, to name two. “They want to supply all the components and software,” he said. “They continue to surprise us with how fast they are moving.”


The V8 features the refrigerant, R-410a, whereas it has R-32 for mini VRF systems. To a question about the possible use of refrigerants other than the two, considering that R-410a has a GWP of 2,088 and is facing calls from certain quarters for its phaseout and that R32 is classified as an A2L refrigerant, owing to its mildly flammable nature, requiring safety in handling, Cheng said Midea is one of the biggest manufacturers in the world and that the company is looking at all possibilities and will need to see the trend. “Different manufacturers are promoting different gases, and there are debates on regulation,” he said. “We will be ready once there is clarity.”


To a question about the global semiconductor crisis, and Midea’s response to dealing with the problem, Cheng said the shortage of chips is a global problem and one that affects all sectors and not just the HVACR sector. “From our perspective, we have learnt that we have to develop strategic partners on key components and to also strengthen our own capability,” he said. “And in China, we have set up our own chip factories in a small scale, and now we are accelerating to a big scale. We will enhance our capability in this area. There are many newcomers, who are planning to manufacture chips, and I think the problem will be solved very soon.”

DriSteem introduces Buyer’s Guide

EDEN PRAIRIE, Minnesota, 17 August 2021: DRI-STEEM Corporation, manufacturer of humidification, evaporative cooling and water treatment products, announced the  introduction of a new buyer’s guide focused on humidification for electronics manufacturing.

DriSteem said it knows the importance of maintaining the appropriate humidity level within electronics manufacturing facilities, as proper relative humidity (RH) levels between 30% and 70% can significantly help decrease damage and stress to electronic components. When humidity levels are greater than 70%, corrosion can become an issue, the company said. In a controlled environment, manufacturers experience a reduction of electrostatic discharge, fewer brittle components, and fewer issues with soldering and de-soldering; they as well are able to create a safe environment for staff, the company added.

“This specific buyer’s guide is positioned to educate facility directors at electronics manufacturing plants about the importance of maintaining proper humidity to not only protect the products they are developing but to also keep workers safe and healthy,” said Randall Potter, Business Development Leader, DriSteem. “Many facility directors have expressed a need for educational materials and meetings. This buyers guide is an easily accessible way to help educate building management about the importance of humidity and how best to manage it throughout a facility.”

GrayWolf announces introducing smart IAQ and toxic gas probes

SHELTON, Connecticut, 12 July 2021: GrayWolf’s DirectSense II probes will now connect via Bluetooth LE wireless to Apple and Android devices, the company announced through a Press release.

GrayWolf said it DSII probes for Indoor Air Quality (IAQ) and toxic gas testing and monitoring will imminently have Apps for iOS and Android operating systems available free on the Apple and Google App stores. It added that it is possible to use a smartphone or tablet as a multi-parameter display or data-logger.

The company said that users can choose from over 25 smart IAQ, green building, industrial hygiene and HVAC sensors, including TVOCs (PID), Carbon Dioxide (NDIR), Ozone (electrochemical), CO, NO2, NH3, SO2, NO, Cl2, H2S, HCN, HCl, O2, H2, %RH and °C/°F. Each probe, the company said, accommodates from two up to eight true plug-and-play sensors into a single handheld, desktop or wall-mounted housing. The sensors offer low limits of detection and exceptional accuracy, the company claimed, adding that the CO2 sensor, for example, leads the IAQ industry at +/-35ppm over the key range, starting from 350ppm to 2000ppm (while +/-3% of reading above that up to 10,000ppm for CO2 toxic exposure use).

As monitoring IAQ parameters is a core application for GrayWolf, extensive development effort was put into assuring that the sensor smartboards would not introduce noise or degrade accuracy, stability or limits of detection (LODs) for the convenience of end-user swappable sensors, the company said. Other manufacturers, it pointed out, have prioritized convenience over performance.

DriSteem releases Buyer’s Guide

EDEN PRAIRIE, Minnesota, 16 May 2021: Dri-Steem, manufacturer of humidification, evaporative cooling and water treatment products, released a buyer’s guide that focuses on humidification for laboratories, the company said through a Press release.

“This new buyer’s guide is written specifically for laboratory facilities personnel,” said Jennifer Montville, Director of Marketing, DriSteem. “Careful control of relative humidity levels in labs generates more accurate test results, prevents contamination, and promotes a healthier work environment. DriSteem has been designing and building world-class humidification equipment for more than 50 years and is committed to helping facilities use those products to optimize their businesses.”

According to the company, its humidification systems are made to fit each unique application, whether it is ensuring the success of critical research, preserving fragile and valuable materials and instrumentation, or protecting the health and wellbeing of building occupants. DriSteem said its mission is to support healthy environments – studies show that ideal room relative humidity (RH) is 40-60%.

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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