Air Change Cfm Calculator

The rate at which air is exchanged (in the premises) represents another method of measuring ventilation capacity & effectiveness. Air exchange rate is typically expressed in Air Changes per Hour – “ACH”. Air changes per hour can be estimated by determining the total air supplied to, and removed from, the premises “total air exchange” or the outdoor (fresh) air supplied to, and removed from, the premises “outdoor air exchange”.

Esta tabela fornece sugestões de trocas de ar por hora (ACH) em condições normais com base em uma boa experiência.

Salas de montagem	4 - 8	Salões de cabeleireiro	10-15
padarias	20 - 30	Hospitais – esterilização	15 a 25
Bancos/Sociedades de Construção	4 - 8	Hospitais – enfermarias	6 - 8
Banheiros	6 - 10	Cozinhas – domésticas	15-20
Quartos	2 - 4	Cozinhas# – comercial	30 minimo
Salas de bilhar*	6 - 8	Laboratórios	6 a 15
Salas de caldeiras	15-30	Lavanderias/lavanderias	10-15
Cafés e cafeterias	10-12	Lavanderias	10 - 30
Cantinas	8-12	Lavatórios	6 a 15
Caves	3 - 10	Salas de aula	5 - 8
Vestiários Área principal	6 - 10	bibliotecas	3 - 5
Vestiários Zona de duche	15-20	Salas de estar	3 - 6
Igrejas	1 - 3	Casas de cogumelos	6 - 10
Cinemas e teatros*	10-15	Escritórios	6 - 10
Quartos do clube	12 mínimo	Oficinas de pintura (não celulose)	10-20
Salas de compressores	10-20	Câmaras escuras de foto e raio-X	10-15
Salas de conferencia	8-12	Bares públicos	12 mínimo
Laticínios	8-10	Salas de controle de gravação	15 a 25
Salões de dança	12 mínimo	Estúdios de gravação	10-12
Cirurgias dentárias	12-15	restaurantes	8-12
Dye funciona	20 - 30	Salas de aula	5 - 7
Lojas de galvanoplastia	10-12	Lojas e supermercados	8-15
Salas de máquinas	15-30	Banhos de chuveiro	15-20
Halls de entrada e corredores	3 - 5	Lojas e armazéns	3 - 6
Fábricas e oficinas	8-10	Quadras de squash	4 mínimo
Fundições	15-30	Banhos de natação	10-15
Garagens	6 - 8	Sanitários	6 - 10
Casas de vidro	25 - 60	Despensas	15-20
ginásios	6 mínimo	Oficinas de soldagem	15-30

*Aumente em 50% onde houver fumo intenso ou se a sala for subterrânea.

#Algumas cozinhas comerciais podem exigir taxas de ventilação mais elevadas, com base no equipamento de cozinha em uso.

FREQUENTLY ASKED QUESTIONS

What is the significance of air changes per hour (ACH) in ventilation systems?

Air changes per hour (ACH) is a crucial parameter in ventilation systems as it directly affects indoor air quality, occupant comfort, and energy consumption. ACH measures the rate at which air is exchanged in a premises, influencing the removal of pollutants, moisture, and heat. Adequate ACH ensures a healthy and comfortable indoor environment, while insufficient ACH can lead to poor air quality, discomfort, and even health issues.

How do I calculate the total air exchange rate in a premises?

To calculate the total air exchange rate, you need to determine the total air supplied to and removed from the premises. This can be done by summing up the airflow rates of all supply and exhaust fans, as well as any natural ventilation sources. The total air exchange rate is then divided by the volume of the premises to obtain the air changes per hour (ACH). For example, if the total air supplied is 10,000 CFM and the premises has a volume of 50,000 cubic feet, the total air exchange rate would be 10,000 CFM / 50,000 cu.ft = 0.2 air changes per hour.

What is the difference between total air exchange and outdoor air exchange?

Total air exchange refers to the total amount of air supplied to and removed from a premises, including recirculated air. Outdoor air exchange, on the other hand, only considers the fresh air brought in from outside and exhausted to the outdoors. While total air exchange provides a broader picture of ventilation, outdoor air exchange is a more direct indicator of the premises’ ability to remove pollutants and provide fresh air to occupants.

How do I determine the required air changes per hour for a specific space?

The required air changes per hour (ACH) for a specific space depends on various factors, including occupancy, activity level, and desired indoor air quality. The table provided in the blog post offers suggested ACH values for different spaces under normal conditions. However, it’s essential to consult relevant standards, such as ASHRAE 62.1, and consider specific requirements for your project. Additionally, you may need to perform calculations based on the space’s volume, occupancy, and ventilation system design.

Can I use air changes per hour to estimate ventilation system sizing?

Air changes per hour (ACH) can be used as a rough estimate for ventilation system sizing, but it’s not a direct correlation. ACH provides a general indication of the required ventilation rate, but it doesn’t account for factors like duct losses, fan efficiency, and heat gain/loss. To accurately size a ventilation system, you should perform detailed calculations considering these factors, as well as the specific requirements of your project.

How does air changes per hour impact energy consumption in HVAC systems?

Air changes per hour (ACH) has a significant impact on energy consumption in HVAC systems. Higher ACH values require more energy to operate fans, heat, and cool the air. Conversely, lower ACH values can lead to reduced energy consumption. However, it’s essential to strike a balance between ACH and energy efficiency, as inadequate ventilation can lead to poor indoor air quality and occupant discomfort. Optimizing ACH based on the specific needs of your project can help minimize energy consumption while maintaining a healthy and comfortable indoor environment.