Supermarket Ventilation System Basics
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- Опубликовано: 8 дек 2022
- HVAC systems used in supermarkets & food retailers. In this video we look at different HVACR systems used in supermarkets & food retail outlets to understand the basics of how they work.
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I work for a company specialized in supermarket HVACR in Canada and I do mostly the HVAC side. What we often have is a large RTU (50-70 tons) coupled with a couple medium sized units, depending on the area of the store. 40% of the time it’ll be a/many air handlers instead of a large RTU.
Most of the heating comes from the refrigeration racks, we call them heat reclaims, some are piped in the ducts while some in the rtus directly, AAON for example has units designed to accommodate a reclaim coil. There’s either a heat exchanger at the rack with a glycol loop or sometimes refrigerant is sent directly to the reclaim coils before going to the condenser. The back stores and the entrance have reclaim fan coils to heat. Most rtus and air handlers hold a secondary heat source to compensate for very cold days.
The big interior air handlers have a condensing unit on the roof to feed the evap coil, in rare occasions I’ve seen a small dedicated parallel rack just for the air handlers. The amount of fresh air brought in depends on a lot of factors, sometimes if there’s a lot of exhaust fans we’ll use specialized rtus like AAONS to compensate for the loss, but in other cases, with kitchens for example, there’s a dedicated make up air. In winter we definitely let more air through since it’s already cooled and the RH is more easily controllable.
One of our main goal with the ventilation in a supermarket is to dehumidify, maintaining a low RH alleviates many problems on the refrigeration side. In my area, we mostly worry about that in summer. Oftentimes the air will be passed through the evaporator coil which removes latent heat,then since that air is cold, we heat it with the reclaim coil to make it expand and lower the RH. It might sound energy inefficient but the difference that it makes to the refrigeration side outweigh that cost.
It’s probably different in other countries but this is what I’ve seen so far in my career.
Not true. Maybe that’s why the air feels so much dryer in a supermarket… like you said the cooling condenses a lot. It’s so interesting
Hi
Thanks for the videos
Thanks !!!
Thanks for sharing your knowledge
I often look up at ventilation for air pollution can i pull my mask down im also interested in the changing of filters for PM 2.5 and thank you for the information.🇬🇧.
Please do a series in radios
That "dirty used air" doesn't leave the air system, it goes back through the return air system passes through the filter and back to the space. What you're showing is a dedicated outdoor air system with an exhaust fan. Which for super markets, is not needed. Also, why pay the cost to condition the outside air from 80, 90, or 100F temp, to 55 - 60 F only just to through that air outside? You pull that now 75-85 deg air back through the system so it doesn't have as great or a delta...
He's referring to a DOAS incorrectly. That's what he actually means.
That explains why Walmart air system smells like old dirty socks. And why in the summer I feel like I'm suffocating inside those places.
They never reuse 100% of the dirty used air, because that would be so unhealthy. Some only reuse a small percentage. Even when reusing a small amount it would be better for energy efficiency but way worse for ventilation and air quality to reuse air. They did an experiment a few months ago and they found out how dirty and unhealthy reusing air is. So he’s correct an you’re incorrect.
I don't understand why the title mentions supermarkets. All the same things apply at any big box retail store and most office buildings. The HVAC engineer in me wonders if the condenser coils for the refrigerated/frozen section could be used as a heat/reheat source in an air handling unit.
I do m&e maintenance in a large distribution centre and we have pretty much this setup. Having worked in supermarkets in the uk, they are also the same, however they are more focused around the fridge/freezer sections, probably more for energy conservation. In a humid climate I could see issues with condensation, hence the need for more dehumidification. Just a though, I am sure someone will know the answer.
Is electricity was only the flow of electrons???
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This video has no subtitles. This is really difficult for me. but the video is great. thanks
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Thirst
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typo at 0:41 haha