Heat Transfer - The rate of heat transfer through the wall

Consider a 5-m-high, 8-m-long, and 0.22-m-thick wall whose representative cross section is as given in the following figure. The thermal conductivities of various materials used, in W/m·K, are kA = kF =2, kB =8, kC =20, kD =15, and kE =35. The left and right surfaces of the wall are maintained at uniform temperature of 300°C and 100°C, respectively. Assuming heat transfer through the wall to be one-dimensional, determine (a) the rate of heat transfer

[@TheMrElklawy]

Porf, why you take the long only 1m
Not 8m as is it?

[@youssefashraf1970]

Bro the area will be 40m square cuz you work on the normal area which will be 5 as given * 8

[@zhipingchai5786]

Why did u take 1m depth to calculate the area?

[@bugrademir95]

Why did you take 1m the long of the wall?

[@ThilebanTheEngineer]

first we take unit length with 0.12 height and at the end we calculate for whole length and height. it's at 14:35

[@huseyintutuncu9795]

Area of the wall is 8mx5m=40m^2, isnt it ? why didn't you use at the beginning of the problem ?

[@ThilebanTheEngineer]

if we use in the beginning, we should divide the area accordingly to calculate R values. it's a difficult thing to do.

[@huseyintutuncu9795]

Thank you

[@huseyintutuncu9795]

Do you have any video about plate exchangers ?

[@letyoursixofmerainonfire7696]

thanks so much❤. I want you to know you save my life in midterm exam😭

[@asithasn8840]

Superd😍 well explain. Thank you❤️

[@diomidistsou5896]

From which book is this?

[@oan7390]

🎉

[@whodaheck]

Great explanation!! thanks so much. I was confused about why the answer to part B was the temperature between A and B. Is it because the T2 will be the same on the right side of B so there is no need to calculate anything for D and E?

[@vyphanngoctruc2834]

what is 5m high of thick wall? if we use the above method, the height of wall is just 0.12 m, isn't it ?