How is a Ahu calculated?
Typical AHU requires a flow rate of 2.4 gallons/ton. So, the flow rate should be 24 gpm for the AHU capacity of 10 TR. A typical AHU will have a Δt of 10° F, hence we assumed the AHU coil outlet temperature as 54° F. Refer water system cooling load calculations for formulae and derivations.
How do I calculate my Ahu capacity?
- Step 1: Calculate Square Footage. Determine the square footage of the area to be cooled.
- Step 2: Multiply to Get BTU Value. Multiply the square footage by 25 to obtain the base BTU value.
- Step 3: Divide by 12,000. Determine the estimated tonnage by dividing the total BTUs by 12,000.
What size HVAC Do I need calculator?
There are online calculators that can help you determine what size HVAC system you need based on what you input into them as well….Using Square Footage to Determine What Size HVAC System is Necessary.
| House Square Footage | BTUs Needed |
|---|---|
| 1,400 – 1,500 | 24,000 |
| 1,500 – 2,000 | 30,000 |
| 2,000 – 2,500 | 34,000 |
How do I calculate my Ahu energy consumption?
Example 2: Calculate the annual energy savings associated with 1% AHU leakage compared to 5%. Annual HVAC Energy Use (AHEU) = 0.88 kW/Ton · 600 Tons · 3,120 hrs. = 1,647,360 kW-hrs. Annual HVAC Energy Cost (AHEC) = $0.08/kW-hr · 1,647,360 kW-hrs.
How CFM is calculated for AHU?
The calculation for CFM involves dividing the total volume of the space by the air exchange interval. To calculate room volume, you measure its length, width and height in feet and multiply these. Dividing this number by the change rate gives the required airflow in CFM.
How do you calculate CFM tonnage?
Thus, if the airflow is 550 cfm for both rooms, the first room will be 225 cfm/ton and the second room will be 550 cfm/ton. 12000 btuh = 1.085 x 550 cfm x (75-55°F). 2.
How do you calculate Ahu CFM?
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.
How CFM is calculated for Ahu?
How do I calculate my HVAC power consumption?
The energy consumption characteristics of two different air conditioners can be compared by dividing the difference between the SEER ratings by the larger SEER number. For example: 16 (SEER) – 10 (SEER) = 6 / 16 = 37.5. Therefore, a 16 SEER air conditioner is 37.5 percent more efficient than a 10 SEER unit.
How many CFM is 1 ton?
400 CFM
How Many CFM For 1 – 6 Ton Units? (Chart)
| Unit Tonnage: | CFMs Required: |
|---|---|
| 1 Ton Unit | 400 CFM |
| 1.5 Ton Unit | 600 CFM |
| 2 Ton Unit | 800 CFM |
| 2.5 Ton Unit | 1,000 CFM |
How many CFM is a 4 ton unit?
Commerical systems go much larger. 1 ton of cooling is equal to 400 cubic feet of air per minute. 2 ton of cooling is 800 cfm and so on. So a 4 ton unit will have 1600 cubic feet of air passing through the system every minute.
How many square feet can a 4 ton AC unit cool?
Step 5: Match your square footage to an HVAC size chart
| Home Sq Footage | Air Conditioner Size (tons) |
|---|---|
| 600 – 1,000 square feet | 1.5 tons |
| 1,000 – 1,500 square feet | 2 tons |
| 1,500 – 2,000 square feet | 3 tons |
| 2,000 – 2,500 square feet | 4 tons |
What is the Air Handling Unit Design Excel calculator?
The Air Handling Unit Design Excel Calculator uses parameters such as sensible load, latent load, and total load to provide the remaining variables needed to select and specify air handling units. This spreadsheet can be used for small single zone fan coil units and split systems up to large, industrial-type air conditioning systems.
What is an air handling unit (AHU)?
Air handling units (AHU) are the lungs of any HVAC system. An air handling unit is a device used to regulate and circulate air as part of the heating, ventilation and air conditioning system. The AHU takes in outside air, filtered and either heated or cooled and supplies it as fresh air to the air conditioned room.
How do you calculate cop in HVAC?
COP = Q (useful heat)/W (input work) ACH = CFM x 60/Area x Heightceiling Total Heat (BTU/hr.) = 4.5 x CFM x Δh (std. air) Sensible Heat (BTU/hr) = 1.1 x CFM x Δt (std. air)
How do you calculate AC tonnage?
Before buying an air conditioner, you have to make the AC tonnage calculation. Not sizing an AC unit properly can cause $1,000s in wasted AC costs or future electricity costs. According to the DOE, “…an air conditioner generally needs 20 BTU for each square foot of living space.” We need to convert BTU to tonnage. 1 ton equals 12,000 BTU.