What is refrigeration capacity? Calculation, conversions

Post date: 10:06:00, 15/07/2020 GMT +7


1 1– What is cooling capacity?
    1.1 Cooling capacity:
        1.1.1 Unit of measure
    1.2 Electrical capacity of air conditioners and air-conditioners
    1.3 What is the BTU index in air conditioner?
        1.3.1 Important note:
2 2 - Formula to calculate and convert powers
3 3 - How to calculate air conditioner / air conditioner capacity
    3.1 Why do we need to know how to calculate the capacity of air conditioners?
    3.2 Formula for calculating harmonic power
4 4 - Calculate the air conditioner capacity in m3
5 5 - How much is 1 horsepower (1HP) in air conditioner?
6 6. How to calculate power consumption of air conditioner
    6.1 The formula for calculation is as follows:
    6.2 Note that:
1– What is cooling capacity?
It seems that cooling capacity is very common and often hears a lot when you shop for air conditioners and refrigerators. However, in reality a lot of people can not distinguish which is the capacity of the cylinder and the power capacity. And here we will introduce to you specific each type of power offline

Refrigeration capacity: Refrigeration capacity is an index to measure the cooling capacity of air-conditioners or air conditioners. An air conditioner with a larger capacity index will be capable of large, high chillers and vice versa, this low index will have low cooling capacity.
 
Unit of measure: Unit of cooling capacity: BTU / h
Currently on the market of selling air conditioners, air conditioners have cold capacity such as: 9000 BTU, 12000BTU, 18000BTU, 24000BTU, 28000BTU, etc.
So we can see that the greater the cooling capacity, the faster the cooling capacity and the selection of a cooling capacity that is suitable for the needs is essential every time you plan to shop for yourself. an air conditioner, air conditioner

Electric power of air conditioners and air-conditioners: Electric power is the power consumption of air conditioners. Electrical horsepower only tells us how much our air conditioner / air consumes. This shows us how much this air conditioner consumes less electricity.
So this capacity can not tell us whether this air conditioner has good cooling, not fast cooling? The determination of fast cold, much cold depends on the cooling capacity as above.
The unit of measurement of electrical power is Kw

What is the BTU index in air conditioner?
The BTU index is interpreted as the amount of energy required for 1 pound (454gram) of water to rise by 1 degree Fahrenheit
BTU is an English term - short for British thermal unit - British thermal unit
Is an energy unit used in the United States. BTU or BTU / h is simply understood as the amount of energy required for 1 pound (454gram) of water to rise by 1 degree F (Fahrenheit) and 143 BTU can melt 1 pound of ice.

Important note:
 BTU is an indicator that reflects the cooling capacity of the air conditioner, rather than the power consumption that many users misunderstand.

2 - Formula to calculate and convert powers
In the process of business and consulting support for many customers we receive thousands of questions related to the problem between cooling capacity, electrical capacity. Many people could not distinguish and did not know how to calculate. In this article we will help people answer questions like:
1 HP is equal to how many W?
1 How many BTU is a horse?
What is the refrigeration capacity of the refrigeration compressor?
1 BTU = Kw
And the most important capacity is:
1 HP = 2545 BTU / hour
1 kW = 3412 BTU / hour
1 kW = 1.34 HP
1BTU ≈ 1055 J = 0.293 Wh
Note is:
No problem 9000BTU / h = 1HP
This is a mistake that many people make!
Correct physical unit, 9000BTU / h = 3.5HP

3 - How to calculate air conditioner / air conditioner capacity:
Why do we need to know how to calculate the capacity of air conditioners?
Many of us who go to buy air conditioners do not know which option to choose. To be able to use air conditioning, a reasonable way, economical, avoiding wasting for each family.
Choose the air conditioning quickly cooling (help us not have to wait long when you want to use the cold room - avoiding waiting hours and hours to use the room, office)
    Know the funding to invest in shopping
    Choose an air conditioner with minimum monthly electricity bill
    Choose a product that best suits the needs of family members
Formula to calculate the harmonic power
Formula: Capacity = (x) m2 x 600BTU (x room area index)
Typically this capacity is usually applied only in accordance with room size, room volume. However, people still rely mainly on room area.
Some examples of choosing air conditioning according to room size
Applying the above formula we can choose the air conditioner based on the room size as follows:
 
Room with an area of 15 m2 Select AC with capacity of 9000 BTU =1HP.
Room with an area of 16 m2 – 22 m2 Select AC with capacity of 12000 BTU = 1,5HP.
Room with an area of ​​ 22 m2 – 30 m2 Select AC with capacity of 18000 BTU = 2HP.
Room with an area of ​​ 30 m2 – 35 m2 Select AC with capacity of 21000 BTU = 2,5HP.
Important notice:
We should note that the cooling capacity of the air conditioner will be affected by other objective factors in your room such as:
    Direct heat source (Our room is close to other big heat sources)
    Number of people present in the room (The heat from the body is very large from 37 ~ 38o C so the number of people in the room will directly affect the room temperature)
    Room building materials (If the room is made of steel such as containner, styrofoam, cement wall, the room also has very different temperatures)
    Number of windows and window tightness (Each room will have different design and tightness is also different)
Knowing these objective factors gives us a thorough solution to the problem of cooling capacity loss, has a fix and helps us to use the air conditioner much more effectively and safely.

4 - Calculate the air conditioner capacity in m3
The calculation method in m2 is the most accurate, but in reality there are some air-conditioned installation locations with large spaces (cafes, restaurants, hotels, offices, etc.). In other words, the height is large and not square like in the bedroom, living room, dining room, meeting room, etc.
In this practical case we call and classify it as a general type of cooling capacity loss. Then we add 0.3 ~ 0.5 HP to each option in m2 above. Thus, we will get the cooling capacity of the air conditioner in m3 volume as follows:
Capacity Family / Restaurant / Cafe / Hotel / Office

 
Capacity Family Restaurant / Cafe Hotel Office
9000btu 45 m3 30 m3 35 m3 30 m3
12000btu 60 m3 45 m3 55 m3 45 m3
18000btu 80 m3 60 m3 70 m3 60 m3
24000btu 120 m3 80 m3 100 m3 80 m3

5 - How much is 1 Horse (1HP) air conditioner?
Perhaps, the above explanations have not satisfied some of you. You still need to know exactly how much power does 9000 BTU Air Conditioner?
Normally 1HP = 9,000 BTU = 0,7456 kW. 1-horse air conditioner is often used for family and office rooms with an area of ​​less than 45m2, coffee restaurant about 30m2 and 35m2 hotel.
1.5 horse air conditioner = 13,000 BTU = 1,13185 kW. This air conditioner is usually used in the family room or office with an area of ​​60m2, coffee restaurant 45m2 and 55m2 hotel room.

6. How to calculate the power consumption of the air conditioner
Above we only calculate examples for you in some specific cases. But in order to have the system and how to calculate it correctly, in this section, we will show you clearly:
The energy consumption of the air conditioner is announced by the manufacturers on the nominal capacity listed on the energy label. When this parameter is available, we will know how much power is consumed in 1 hour. Almost all air conditioners specify this indicator, we can look at this index to know exactly how much electricity your home air conditioner consumes, how much kw it is in 1 hour.
See the example below:


Power consumption of air conditioners on Daikin 9000 air conditioners
Power consumption depends on the type of air conditioner of different brands.
The calculation formula is as follows:
A = P.t
In which A: power consumption in time t
 P: power (unit KW);
 t: time of use (hour unit)
From this formula we calculate will be
1 air conditioner 9000 BTU with power ranging from 800 - 850 W.
The 12000 BTU machines have a capacity of 1500W.
Thus, if an air conditioner 9000BTU runs within an hour will consume 0.85KWh (nearly 1 number of electricity). And a 12000BTU air conditioner will cost your family 1.5 electricity after 1 hour of use.

Note: As above we see that if an air conditioner has a capacity of 9000BTU, it will consume 0.85KW if using 1 hour. However, when we pay for electricity, the consumption may be less, because manufacturers calculate this is the largest capacity when used at full capacity, but in reality we do not always use use all that power. Therefore our electricity bills are usually less than the original calculation.
In addition, if you want to save, you should also note that using inverter air conditioners can save up to 30 ~ 40% of the monthly electricity bill. And choose the air conditioner which saves the most power, please note your energy efficiency index. For example in the example below energy efficiency 4.5 can save up to 45% of your energy consumption

So in this article we have shared with you what is cooling capacity, what is the power consumption and how to calculate the capacity of each type, the formula for calculating the power consumption of air conditioners.

Practical experience
Estimate in the range of 1 HP for 35 - 45 m3 room (or calculated according to the above formula). For example:
The room has dimensions: 3 x 4 x 3.5m = 42 m3. Choose 1 HP air conditioner
The room has dimensions: 4 x 5 x 3.5m = 70 m3. Choose 1.5 HP or 2 HP air conditioner
The room has dimensions: 5 x 6 x 3.5m = 105 m3. Choose 2.5 HP air conditioner
Note: Air conditioning capacity is also affected by other factors such as construction materials, heat sources affecting the room and the number of people who regularly use the room. So not all rooms have the same standards, so we can add or subtract about 5 - 10 cubic meters depending on the case ...

In case of using a room with direct sunlight, connecting to another room, having exhaust fans, .. we add from 0.3 ~ 0.5 Hp depending on the degree of heat and loss of cooling capacity.

Air conditioner for family room
If the common space as the Living Room, Kitchen add 0.5 Hp
The volume of about 40 m3 (cubic) = 1.0 Hp
The volume of about 60 m3 (cubic) = 1.5 Hp
Volume of about 80 m3 (cubic) = 2.0 Hp

 

Air-conditioner for cafes, restaurants
Due to the fact that sometimes there are a lot of people, there are exhaust fans, so the capacity must be selected for the highest load density (heat generated by people, ventilated outside)
The volume of about 30 m3 (blocks) = 1.0 Hp
The volume of about 45 m3 (cubic) = 1.5 Hp
The volume of about 60 m3 (cubic) = 2.0 Hp

Air conditioner for Hotels:  Due to the characteristics of short-term hotel guests or foreign guests, they often require the machine to cool quickly after entering the ventilated room, which we calculate is higher capacity than the family bedroom.
The volume of about 35 m3 (cubic) = 1.0 Hp
The volume of about 55 m3 (cubic) = 1.5 Hp
The volume of about 70 m3 (cubic) = 2.0 Hp
 
Air conditioner for Office work
Here we choose the standard is the office of the stable number of people equipped with computers for each person, copiers, fax machines, printers, ... if there are few people and the number of devices is not Many can count as air conditioner for family living room.
The volume of about 35 m3 (cubic) = 1.0 Hp
The volume of about 55 m3 (cubic) = 1.5 Hp
The volume of about 70 m3 (cubic) = 2.0 Hp
 

With the above formula, you can calculate the necessary air-conditioning capacity for your room depending on the height, area, volume and direction of the house. Thus, when buying air conditioning to consider, calculate all the factors that can affect the operation of the machine to be able to choose for themselves an air conditioner with the most suitable capacity. and want to be there you need expert consultants with expertise as well as market prices to advise you most clearly.

Choose the capacity of air conditioning for the office
Wish you better understand to be able to choose the air conditioner that best suits the needs of use that save most shopping costs, save the most electricity.