Apassive solar home has energy stored in a concrete floor of 1000 square feet. how thick should this floor be to store 15 btu with a temperature swing of 20 degrees f? (compute the answer in feet. if the floor should be one tenth of a foot thick, enter 0.1) (note: you'll need to find a value in your textbook for the energy storage capacity of concrete)

Thickness is 0.086 ft

Solution:

iAs per the question:

Temperature, T =

Energy to be stored, E = 150000 Btu

Area of the concrete floor, A =

Density of concrete,

The heat energy is given by:

        (1)

Also, we know that:

1 Btu = 1055 J

where

= density

m = Mass

V = Volume

A = Area

t = thickness

s = 750 Jk/kg

Now, eqn (1) can be written as:

Thickness can be written as:

t = 0.02625 m

t =

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.