Guidelines on how to calculate air conditioner, suitable for each room.

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1. Guidelines on how to calculate air conditioner, suitable for each room.

Various methods for calculating air conditioner capacity.

A few tips for installing air conditioners in various room spaces

Air conditioners for cafes, restaurants

Air conditioners for hotels

Air conditioners for office workplaces

When purchasing an air conditioner for the first time, many are puzzled about choosing the right capacity for the room. Here's a simple way to calculate capacity!

1. Guidelines on how to calculate air conditioner, suitable for each room.

Various methods for calculating air conditioner capacity.

The formula for calculating air conditioner capacity mainly depends on the area or volume of the space to be cooled. Accordingly, we have the following calculation methods:

Calculating air conditioner capacity based on room area.

This formula can be applied to normal rooms with average ceiling conditions of 3m or less (typical ceiling height in Vietnam).

Required capacity for the room = Room area * 600 BTU (equivalent to 600 BTU/ m2)

BTU is a British thermal unit, used to measure the power of heating or cooling devices.
9,000 BTU = 1 HP (1 horsepower).

Example: For a room with an area of 15 m2, you will calculate: 15 m2 x 600 BTU = 9,000 BTU, equivalent to a 1 HP capacity air conditioner.

Calculating air conditioner capacity based on room volume

The advantage of calculating based on volume is that it provides more accurate results compared to calculating based on area. This method should be applied to cases with high ceilings, loft rooms, etc.

Required capacity for the room = Room volume * 200 BTU (equivalent to 200 BTU/ m3)

Room volume = room area x height

Example: For a room with a volume of 50 m3, you will calculate: 50 m3 x 200 BTU = 10,000 BTU => it is advisable to choose a 1.5 HP capacity air conditioner for sufficient cooling.

Calculating capacity based on external conditions

The calculation methods mentioned above have simplified external factors to provide relatively acceptable accuracy. However, if specific parameters are available, you can also calculate the air conditioner capacity based on external conditions using the formula below:

The cooling capacity of an air conditioner can be affected by various factors such as:

Building materials.
Direct heat sources.
Number of people in the room.
Presence of electronic devices in the room.
Windows in the room…

In summary, depending on the actual conditions, it may be necessary to choose a higher capacity unit. For instance, if the room is exposed to direct sunlight, is connected to other rooms, typically has a large number of occupants, etc., it's advisable to add an extra 0.5 HP (~4500 BTU) to the intended capacity of the unit to compensate for additional heat loss.

Some suggestions for selecting air conditioner capacity based on area and volume

Phòng 15 m2 trở xuống (dưới 45 m3)	1 HP (9000 BTU)
Phòng 15 m2 đến 20 m2 (dưới 60 m3)	1.5 HP (12000 BTU)
Phòng trên 20 m2 đến 30 m2 (dưới 80 m3)	2 HP (18000 BTU)
Phòng trên 30 m2 tới 40 m2 (dưới 120 m3)	2.5 HP (24000 BTU)

Choosing the right capacity unit can lead to significant cost savings.

A few tips for installing air conditioners in various room spaces

Air conditioning for family rooms

Air conditioners for households usually have small capacities because they don't need to cool too much. However, if the space where you place the air conditioner is a living room or kitchen, you should add an extra 0.5 HP. Because those areas often accommodate many people and have relatively large heat emissions.

Living rooms, being often crowded, should add an extra 0.5 HP.

Air conditioners for cafes, restaurants

If you're choosing an air conditioner for a cafe or restaurant, due to the crowded nature and frequent opening and closing of doors, you need to select a unit with a relatively large capacity.

Cafes should choose air conditioners with large capacities

Air conditioners for hotels

Most hotels usually rent rooms for short periods of time, so upon entering the room, users often want the room to cool down quickly.

Hotels should choose air conditioners with fast cooling speeds

Air conditioners for office workplaces

Most office workplaces typically have a stable number of employees who remain seated for long periods. Therefore, we can calculate the air conditioner capacity similar to the type used for family living rooms.

Office workplaces usually have a certain number of people

>> Below is a table for selecting air conditioner capacity based on usage needs and the maximum room volume for your reference:

Công suất	Gia đình	Café/Nhà hàng	Khách sạn	Văn phòng
1 HP	45 m3	30 m3	35 m3	45 m3
1.5 HP	60 m3	45 m3	55 m3	60 m3
2 HP	80 m3	60 m3	70 m3	80 m3
2.5 HP	120 m3	80 m3	100 m3	120 m3

Frequently Asked Questions

What is the best way to calculate air conditioner capacity for a room?

To calculate the best air conditioner capacity for a room, you can use the formula based on room area or volume. For area, multiply the room's square meters by 600 BTU. For volume, multiply the room's cubic meters by 200 BTU. These calculations help ensure effective cooling based on your specific room conditions.

How does ceiling height affect air conditioner capacity calculations?

Ceiling height significantly influences air conditioner capacity calculations. For rooms with standard ceilings of 3 meters or less, calculating based on area is suitable. However, for high ceilings or loft spaces, using the room volume is more accurate, as it considers the total air space that needs cooling.

Should I choose a larger capacity air conditioner for sunny rooms?

Yes, if your room is exposed to direct sunlight or has numerous occupants, you should choose a larger capacity air conditioner. It's advisable to add an extra 0.5 HP to account for additional heat from sunlight and people, ensuring the unit can maintain a comfortable temperature.

What factors should I consider when selecting air conditioner capacity for cafes?

When selecting air conditioner capacity for cafes, consider factors such as the high number of patrons, frequent door openings, and overall heat emissions. Choosing a unit with a larger capacity ensures that it can effectively cool the space, providing comfort to customers despite constant changes in the environment.

What capacity air conditioner do I need for a 20 m2 room?

For a 20 m2 room, you would typically need a 1.5 HP air conditioner, which is equivalent to 12,000 BTU. This capacity is suitable for rooms up to 60 m3, ensuring adequate cooling while maintaining energy efficiency.

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