How do I calculate my AHU room size?

How do I calculate my AHU room size?

6 Steps to Properly Size Your HVAC Unit

1. Step 1: Calculate the square footage of the area to be cooled.
2. Step 2: Next, multiply the square footage obtained for each area by 25.
3. Step 3: Then, add 400 for each person who works in that particular area.
4. Step 4: Finally, for each window, add 1,000.

How do you calculate AHU cfm?

To calculate Air Flow in Cubic Feet per Minute (CFM), determine the Flow Velocity in feet per minute, then multiply this figure by the Duct Cross Sectional Area.

What is thumb rule in HVAC?

Rule of thumb. Rules of thumb have be used for decades when sizing HVAC systems. For example, one commonly used rule of thumb for general office areas is that the cooling load is 200-300 square feet of floor area per ton of cooling. For data centers, the cooling load is 150-300 square feet per ton of cooling.

Where should AHU be placed in building?

They are usually located in the basement, on the roof or on the floors of a building. AHU’s will serve a specified area or zone within a building such as the east side, or floors 1 – 10 or perhaps a single purpose such as just the buildings toilets. Therefore, it’s very common to find multiple AHU’s around a building.

What is the CFM formula?

CFM = (fpm * area), where fpm is the feet per minute. To find the cubic feet per minute, substitute the FPM value with the area after the area is squared.

What is the size of AHU?

The AHU panels are manufactured in nominal thickness of 25mm & 50mm which are mounted on a frame composed of an aluminium profile, which outlines the equipment edges precisely.

What size CFM do I need for my room?

One cfm is needed per square foot (1 cfm/sq ft) of floor area. This is the average air quantity required for a room or an entire building.

Can you convert psi to CFM?

The relationship between CFM and PSI is just linear. if you get 8 CFM at 120 psi, you will get 4 CFM at 60 PSI. The pressure just “pushes” the air out, and with half the “push” you get half the air flow.

How do you calculate chilled water tonnage?

Calculate BTU/hr. = Gallons per hr x 8.33 x ΔT°F. Calculate tons of cooling capacity Tons = BTU/hr. ÷ 12,000. Oversize the chiller by 20% Ideal Size in Tons = Tons x 1.2.

What is the typical basic design of an AHU?

These are the basic components in an AHU: Fans, Coils, Filters, Heaters, Humidifiers, Dampers, Mixers, and Enthalpy/Desiccant Wheels. There are other fixtures in an AHU for controls purposes, but basically these are the components you will see on most AHUs.

What is difference between AHU and HVAC?

AHU, which is Air Handling Unit is an appliance used to circulate air. HVAC is Heating, Ventilating and Air Conditioning system. HVAC is the central unit to which AHU is connected. AHU is only a part of HVAC and as such there is hardly any difference between then two.

How tall is a custom air handling unit?

Generally 6″ (150mm) height concrete pad or steel stand. Custom made air handling units: To obtain design requirements, air handling unit may be built to fit the exact requirements of the building. Custom unit is more expensive, but it has many advantages make it more efficient.

What should be the design of an ahu roof?

– Insolated double skin body is recommended even if AHU is placed in mechanical room inside the building. Provide more insulation for outdoor unit. – For outdoor units slope the roof to prevent rain water. In cold weather where snow may accumulate, AHU roof shall be designed to bear snow accumulation.

How to select the correct ahu for a project?

Our AHU selection guide enables you to rapidly select the appropriate unit size for a specific project requirement. Simply, select the velocity and volume (or next highest value) required from the table. Then, locate the unit size, external width and external height from the left hand column.

How to calculate the cooling capacity of an ahu?

Coil ADP is based on Coil bypass Factor. Normal Standard coil bypass factor is 0.1. From Psychrometric Chart , g2 is 0.0108 kg/kg (10.8 g/kg). Δg = 0.0186 – 0.0108 = 0.0078 kg/kg. Total Cooling Capacity for AHU is Sensible Load + Latent Load.