Hi, I am confused with the difference between ventilation ACH, minimum ACH and recirculated ACH. Does that mean for the last example in hospital recovery room, we total need intake of 6 ACH, where 2 ACH is exhausted to the outside each time and 4 ACH is recirculated back to the HVAC equipment?
Yes, the minimum total ACH is the amount of times the air in the room has to be turned over in an hour, which is composed of the minimum ventilation ACH and either recirculated ACH within the space or through the Air Handler.
Hello, and CFM cooling is Q/1.1*ACF*DT ? CFM cooling from Sensible Load, CFM from occupied zone ASHRAE 62.1, and CFM from INFILTRATI could explain the relation between ALL CFM.
CFM represents a certain volume of air. This air can be part of the air change calculation. Air changes and that volume of air used in the calculation can come from ventilation CFM (ASHRAE 62.1), or from air Recirculated within the space through the AC system. Infiltration is air that makes it way into a space through cracks or openings in the buildings structure.
Thanks for watching. We'll be adding more video's on cleanrooms and operating rooms. Our next video is on Cleanroom Fan Filter Units, be sure to watch that one later this week when its released.
I don't understand how separate rooms under the same air system need different ACH. Are they programmable to distribute air differently to each room individually as needed?
The amount of air changes required for a particular room can be dictated by code or by a Standard like ASHRAE 62.1. In critical spaces where controlling the volume of air is important to the process or procedure, like laboratories or operating rooms in a Hospital, there will often be some form of volume control. This can be done with a VAV, CAV or automated damper of some form. In other non-critical spaces the rooms can be served without any form of volume control, but can be air balanced using manual dampers by a trained technician to provide the design CFM. See our other video on Hospital Isolation rooms work to give you a better idea on how air is controlled in critical spaces. ruclips.net/video/9MXBpQGDu9k/видео.html
Pressure control is important in Hospitals and Cleanrooms as you Know. Its basically providing more CFM then you return or exhaust if you want positive pressure , and providing less CFM than you return or exhaust if you want negative pressure. We'll take your idea for a video into consideration.
The amount of ventilation air is based on the type of space and the code required minimums for that space. A crowed assembly hall will need more outside air (Ventilation Air) per area, then a standard office space. See ASHRAE 62.1 for ventilation air requirements.
Hi, I am confused with the difference between ventilation ACH, minimum ACH and recirculated ACH. Does that mean for the last example in hospital recovery room, we total need intake of 6 ACH, where 2 ACH is exhausted to the outside each time and 4 ACH is recirculated back to the HVAC equipment?
Yes, the minimum total ACH is the amount of times the air in the room has to be turned over in an hour, which is composed of the minimum ventilation ACH and either recirculated ACH within the space or through the Air Handler.
Is the ventilation ACH exhaust air or fresh air? Or both
Hello, and CFM cooling is Q/1.1*ACF*DT ? CFM cooling from Sensible Load, CFM from occupied zone ASHRAE 62.1, and CFM from INFILTRATI could explain the relation between ALL CFM.
CFM represents a certain volume of air. This air can be part of the air change calculation. Air changes and that volume of air used in the calculation can come from ventilation CFM (ASHRAE 62.1), or from air Recirculated within the space through the AC system. Infiltration is air that makes it way into a space through cracks or openings in the buildings structure.
Very useful video ,I hope you take again about cleaning room , operation room and how to control their pressure according to AShRae standard ❤❤❤❤❤❤❤❤
Thanks for watching. We'll be adding more video's on cleanrooms and operating rooms. Our next video is on Cleanroom Fan Filter Units, be sure to watch that one later this week when its released.
I don't understand how separate rooms under the same air system need different ACH. Are they programmable to distribute air differently to each room individually as needed?
The amount of air changes required for a particular room can be dictated by code or by a Standard like ASHRAE 62.1. In critical spaces where controlling the volume of air is important to the process or procedure, like laboratories or operating rooms in a Hospital, there will often be some form of volume control. This can be done with a VAV, CAV or automated damper of some form. In other non-critical spaces the rooms can be served without any form of volume control, but can be air balanced using manual dampers by a trained technician to provide the design CFM. See our other video on Hospital Isolation rooms work to give you a better idea on how air is controlled in critical spaces. ruclips.net/video/9MXBpQGDu9k/видео.html
@@MEPAcademy thanks for the reply. I'll likely be a regular on your channel.
Thanks for your Time, i need a vidéo explain how to control the pression in the opération room
Pressure control is important in Hospitals and Cleanrooms as you Know. Its basically providing more CFM then you return or exhaust if you want positive pressure , and providing less CFM than you return or exhaust if you want negative pressure. We'll take your idea for a video into consideration.
What outside minimum temperature 2 use a/c?
The amount of ventilation air is based on the type of space and the code required minimums for that space. A crowed assembly hall will need more outside air (Ventilation Air) per area, then a standard office space. See ASHRAE 62.1 for ventilation air requirements.
Do like to share this very informative video please.
Thank you, I will