How to calculate the btu of an existing radiator?

To calculate the BTU of an existing radiator, you will need to know the dimensions of the radiator, as well as the water temperature and the room temperature. Once you have these measurements, you can use a BTU calculator to determine the BTU of the radiator.

You will need to know the dimensions of the radiator in order to calculate the BTU.

How do you calculate the output of an existing radiator?

If you are looking to heat your home with cast iron radiators, it is important to know that you will need to multiply the square footage of the one section by the number of sections in order to determine the total square footage of radiation. Additionally, please note that a house heated with all cast iron radiators will generally not have a supply temperature that exceeds 140 degrees Fahrenheit or 90 BTUs per square foot of output.

1 Watt of energy is equivalent to 341 BTU’s. So if you have a BTU measurement, you can divide it by 341 to find out the heat output of your radiator in Watts.

How do you calculate radiator capacity

In order to calculate the volume of a room in cubic metres, you will need to multiply the height of the room by the surface area. Once you have done this, you will need to multiply the result with the required wattage per cubic metre. This will give you an estimate of the radiator output that you need.

The heat transfer formula for water is: Btu/hr = GPM x 500 x ΔT. ΔT is the temperature difference between entering and leaving fluid (°F).

How do you calculate heat load on a radiator?

This equation is used to determine the heat load, or the amount of heat that needs to be removed from a space in order to maintain a comfortable temperature. The variables in the equation are as follows: Q = heat load, m = mass of air, Cp = specific heat of air, and ΔT = temperature difference.

As a general rule of thumb, you’ll need to work out how big your space is by multiplying the length, width and height of its walls Once you know how big the room is, you should install one radiator for every 5m³ of space you need to heat.

What is the heat output of a standard radiator?

Radiant heaters are powered by electricity, and their power output is measured in watts. The most common radiant heater power outputs are 1,000 watts (3,412 BTU/hour) and 1,500 watts (5,118 BTU/hour).

When looking for radiators or heated towel racks, always go for something with a high BTU output. This will ensure that your room is evenly heated and that you won’t have to worry about cold spots.

How do you calculate cooling capacity of a radiator

The equation Q = ṁ x Cp x ΔT can be used to calculate the cooling capacity of a substance. The value for Cp should be in units of kJ per kg per Kelvin. In order to convert the Celsius temperature to Kelvin, we add 273.15 to the Celsius temperature.

This radiator is a double panel, type 20 central heating radiator with a 4312 BTU / 1264 Watt output at Delta T50. It has a white finish.

How many BTU per square foot?

This means that if you have a home that is 1,000 square feet, you will need an air conditioner that is rated for at least 20,000 Btu. If you have a home that is 2,000 square feet, you will need an air conditioner that is rated for at least 40,000 Btu.

To accurately measure the square footage of your home, room, or space you intend to cool, multiply the length of the room by its width. This will give you the room’s square footage, or area, in square feet (ft2). To estimate the proper air conditioner size in British Thermal Units (BTUs), multiply the square footage by 25.

What is the formula for BTU in HVAC

Total BTU equals delivered airflow (cfm) times the change in temperature and moisture content of the air through the system (Delta-T), times the constant of 45.

As a rule of thumb, you should allow for 10 litres of water per standard radiator, and an additional 10 litres for the boiler. This means that for a system with 10 radiators and a modern boiler, you should allow for an approximate system volume of 110 litres.

How do you calculate heat output?

In order to determine the value of Q, we would use the equation Q = m•C•ΔT. The m and the C are known; the ΔT can be determined from the initial and final temperature. With three of the four quantities of the relevant equation known, we can substitute and solve for Q.

For a given heat load, the required flow rate can be determined by using the equation:

Heat (kWatts) = Flowrate (Litres/sec) x 42 (Specific heat of water) x temperature rise (Δt or dt)


Heat is the heat load in kW

Flowrate is the required flow rate in litres per second

Specific heat is the specific heat of water (42 MJ/kg/K)

Temperature rise is the desired temperature increase in the water

Warp Up

There is no definitive answer to this question as there are a number of variables that need to be considered, such as the size and type of radiator, the level of insulation, the type of fuel being used, and the climate. However, there are some general steps that can be followed to calculate the BTU of an existing radiator. First, the radiator should be measured to determine its height, width, and depth. Next, the insulation level should be determined, as this will affect the heat loss. The type of fuel being used should also be considered, as this will affect the efficiency of the radiator. Finally, the climate should be taken into consideration, as this will also impact the heat loss. By taking all of these factors into account, it is possible to calculate the BTU of an existing radiator.

After reading this article, you now know how to calculate the btu of an existing radiator. To do so, you need to know the radiator’s height, width, and weight. With this information, you can use a simple formula to calculate the btu of your radiator.

Clara is a radiator heating technician. She's been working in the heating and cooling industry for over 20 years, and she loves helping fix people's heating/cooling problems. In her spare time, Clara spends time writing articles!

Leave a Comment