Dimensions of a room to be electrically heated

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In summary, to maintain a room with dimensions 7m x 6m x 3m at a temperature of 20 C when the outside temperature is 0 C, an electric heater is required. The floor has a transmission coefficient of 11.5 W/m^2/C, the walls have a coefficient of 2.0 W/m^2/C, and the windows and door have a coefficient of 5.8 W/m^2/C. The ceiling has a coefficient of 1.0 W/m^2/C. The total heat loss should be calculated by multiplying the area of each structure by its corresponding coefficient. The total heat loss is the sum of all these calculations, and this value can be used to determine the
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jase03
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A room 7m x 6m x 3m high is to be electically heated to maintain the inside temperature at 20 C, when it is 0 C outside. The room has 2 windows each 1.2m x 1.8m and a sliding glass door 2.4m x 2.1m. The transmission coefficients u in Wm^2/C are given below.

Floor: concrete slab (100mm thick) : 11.5 W/m^2/C

Walls: Cavity Brick (280mm thick) : 2.0 W/m^2/C

Windows and door (Single glazed) : 5.8 W/m^2/C

Ceiling: (do not consider a roof) : 1.0 W/m^2/C

Ignore the effects of furnishings, presence of humans, orientation to sun or any wind exposure

Assume:

There is no requirement to heat the air in the room

Calculate the power rating of the electric heater required to maintain the required temperature.
You are required to tabulate your calculations providing one row for each part of the buildings structure and column headings of area, u and heat loss. The total heat loss should be provided at the bottom of the table. Provide a table number and a suitable caption for your table.


-------------------------------

I've pretty much worked out the table.

However except for the area of the walls. The answer is coming to 68.64 m^2

I just don't know how they got that answer. Any light.

Cheers
 
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jase03 said:
A room 7m x 6m x 3m high is to be electically heated to maintain the inside temperature at 20 C, when it is 0 C outside. The room has 2 windows each 1.2m x 1.8m and a sliding glass door 2.4m x 2.1m. The transmission coefficients u in Wm^2/C are given below.

Floor: concrete slab (100mm thick) : 11.5 W/m^2/C

Walls: Cavity Brick (280mm thick) : 2.0 W/m^2/C

Windows and door (Single glazed) : 5.8 W/m^2/C

Ceiling: (do not consider a roof) : 1.0 W/m^2/C

Ignore the effects of furnishings, presence of humans, orientation to sun or any wind exposure

Assume:

There is no requirement to heat the air in the room

Calculate the power rating of the electric heater required to maintain the required temperature.
You are required to tabulate your calculations providing one row for each part of the buildings structure and column headings of area, u and heat loss. The total heat loss should be provided at the bottom of the table. Provide a table number and a suitable caption for your table.


-------------------------------

I've pretty much worked out the table.

However except for the area of the walls. The answer is coming to 68.64 m^2

I just don't know how they got that answer. Any light.
What's your method of calculating the area of the walls? Did you forget to subtract out the areas of the windows and door?
 

Related to Dimensions of a room to be electrically heated

1. What are the standard dimensions for a room to be electrically heated?

The standard dimensions for a room to be electrically heated vary based on the type of heating system being used. However, a general rule of thumb is that for every 10 square feet of room, you will need approximately 1,000 watts of heating power. This means that a 100 square foot room would require a 1,000 watt heater.

2. How does the size of a room affect the heating requirements?

The size of a room directly affects the heating requirements because a larger room will require more heating power to reach and maintain a comfortable temperature. Additionally, the height of the room can also impact heating needs as taller ceilings may require more energy to heat the air effectively.

3. Can you use a heater that is too big for a room?

It is not recommended to use a heater that is too big for a room. This can lead to excessive energy consumption and potentially create a fire hazard. It is important to choose a heater that is appropriately sized for the room to ensure efficient and safe heating.

4. What is the ideal room size for a specific type of heater?

The ideal room size for a specific type of heater can vary. For example, a radiant heater is best suited for smaller rooms while a convection heater may be more effective in larger rooms. It is important to consult the manufacturer's recommendations for the specific heater being used.

5. Are there any safety considerations when determining the dimensions of a room to be electrically heated?

Yes, there are several safety considerations to keep in mind when determining the dimensions of a room to be electrically heated. It is important to ensure that there is adequate space around the heater for proper ventilation and that the heater is not placed near any flammable materials. Additionally, the wattage and voltage requirements of the heater should be taken into consideration to prevent overloading the electrical system.

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