How to Heat Bricks
in the form of masonry fireplaces. These structures used a fire to warm the brick structure allowing the brick to release the absorbed heat for 12 or more hours. Currently masonry stoves and heated bricks are used in areas where electrical and gas heating are either impractical or unavailable. These systems are easy green solutions to off grid heating. The method for heating bricks in an off grid situation can be either passive or active depending on the availability of sunlight, electrical ovens or open fire.
Use the following equations to figure out how many bricks you need to use to heat your room to the temperature you want.
The average heat output of a masonry brick is 150 BTU per square foot of surface area per hour, so 1 square foot of brick surface area heated to 350 degrees = 150 BTU for 12 hours.
One BTU will heat about 55 cubic foot of air by one degree F which means 1 BTU = +1 degree per 55 cubic feet.
Knowing these two equations will allow you to compute the number of bricks needed to heat any size room. To find the size of the room you want to heat,
cards against humanity sale, multiply the height of the room by the length and width (assuming your room is rectangular).
So the equation you need is as follows: Size of the room in cubic feet divided by 55, multiplied by the amount of temperature change needed, divided by 150,
card for humanity, equals the square feet of surface area of brick needed.
For example: a 20 feet by 15 feet by 10 feet room that needs to be warmed from 35 degrees to 70 degrees would need almost 13 square feet of brick surface area.
A standard masonry brick is 3 5/8 inches by 2 1/4 inches by 8 inches. You would need about two bricks to get one square foot of surface area. For the hypothetical room it would take 26 heated bricks to do the job.