Thread: Corona Virus

Originally Posted by 4bee

Yep this does keep on bobbing up it seems. Maybe I have a Crystal Ball as I have seen this raising it's ugly head from Day 1 or 2.

Also what must be considered is the amount of AC Systems that do not even have fresh air Makeup. ie. Bad design, laziness on site, Cost cutting, Under design ie "Can,t introduce too much ambient air, our system is on borderline capacity now."

All that sort of ****. We have all seen it Rick.

It is then 100% recirc air. Trouble is you never know which premises are substandard. & put you at risk. Princess rings a bell. No not eight bells, a final bell.

My opinion is still a bank of UV lamps in the return air Path. Time will tell, eh?

All the big systems I look after only introduce fresh air when a pre-determined CO threshold is reached, (usually 900ppm, but I can adjust that on the BMS) so until that point it's 100% recycled air.

Four more cases linked to the Crossroads Hotel brings the number of cases to nine. In Victoria;

According to today's coronavirus update, Victorian health officials have identified the following outbreaks:

• Four cases have been linked to LaManna Supermarket Essendon
• Two cases have been linked to Linfox Distribution Centre Truganina
• Six cases have been linked to Cenvic Construction Riverina Apartments in Footscray
• 11 cases have been linked to Somerville Meats
• Four cases have been linked to JBS Abattoir in Brooklyn
• Two cases have been linked to Box Hill Hospital
• 11 cases have been linked to Brunswick Private Hospital
• Eight cases have been linked to the Alfred Hospital
• 11 cases have been linked to Menarock Life Aged Care Facility
• 12 cases have been linked to Glendale Aged Care Facility in Werribee

Queensland ready to test a virus vaccine on humans. 273 new cases in Victoria.

Death toll rises to 108 as Australians told to learn to live with virus

The relentless torrent of bad news in Victoria has added an extra urgency to the University of Queensland vaccine, which is now ready to be tested on humans.
The human testing of the “molecular clamp” vaccine candidate, to start on Monday, follows encouraging results from animal testing trials conducted in the Netherlands, the Sunday Mail in Brisbane reports.
Professor Robert Booy, head of Clinical Research at the National Centre for Immunisation Research and Surveillance, said the animal trials would have “ticked all the boxes”, allowing the human testing to go ahead.
“There is no way the research team would be able to progress from animals to humans without a complete guarantee of safety and they would likely have a confidence in its effectiveness,”

There are are around 200 vaccines being fast-tracked around the world, but UQ’s work is believed to have shown great success in the pre-clinical stage of development.
“We invested millions into this research because we know a vaccine is crucial to defeating COVID-19,” Queensland Innovation Minister Kate Jones told the Sunday Mail.

Heard a NSW medical officer saying the Crossroads Hotel at Casula on the Hume is popular with freight drivers, so now they're trying to track 600+ people, who could be anywhere.

Originally Posted by rick130

All the big systems I look after only introduce fresh air when a pre-determined CO threshold is reached, (usually 900ppm, but I can adjust that on the BMS) so until that point it's 100% recycled air.

Bwhahaha. If the CO levels were 900 ppm everyone would be long dead.

You mean CO2.

Originally Posted by Red90

Bwhahaha. If the CO levels were 900 ppm everyone would be long dead.

You mean CO2.

Yep. My bad.
Our CO trip points in the carparks are 5ppm. I tested 9 Carpark sensors last week.

So we arrived at the border of Qld/NSW last night,heading north,M1, around 8.30pm.

Exactly 1 hour,20 minutes later we got through.

All they did is see the 'G' pass on the windscreen,then waved us on.

The issue is reducing two lanes to one,causing congestion.The line up of vehicles was 3.6Km long,going off google maps.

It would be pretty simple to have the two lanes going through,one officer for each lane,but i suppose,that would be to difficult for them to organise

Cost cutting measures no doubt.They would rather inconvenience everyone.

Might have been quicker to go through Tweed,and Coolangatta,but who knows.

Originally Posted by rick130

All the big systems I look after only introduce fresh air when a pre-determined CO threshold is reached, (usually 900ppm, but I can adjust that on the BMS) so until that point it's 100% recycled air.

Quite a few ducted systems we run across have the fresh air shut off as the systems are undersized

Most of the older large systems have a fixed fresh air quantity,with the addition of full or modulated fresh air quantity, depending on outside air temperature,space temp, and cooling call %.Some also have a purge system,that will start the AHU's early in the morning,before the building is occupied,usually around 4.00am,for 30 minutes,to purge all the stale and hot air out of the space,using full fresh air and on some sites, utilising smoke exhaust/spill air fans as well.This cycle is also dependant on space temperature at the time.

Using actual CO2 readings is better,as long as its all working OK.