Not following; wouldn't you just look up the numbers?

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You look up the thermal conductivity by Google search, then you calculate the R-factor for each case.

I did some search on K values and made a file. Attached here. Could please evaluate.

Basically I would like to know what is the net heat gain inside the room in a day.

• https://files.engineering.com/getfile.aspx?folder=a4b7656b-b5f9-405b-bfe0-6

Your math, while correct is for conduction, and not for convection.

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This comparison requirement is for selecting either glass wall or brick wall for living rooms.

Should i check for convection also ? But convection involves liquids and gases ...

And your living room and exterior is a vacuum environment?

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Dear sir,
I could not understand your comment "vacuum environment "

Could you please elaborate ...

Your wall, glass or otherwise, is surrounded by what?

Moreover,
> units in row 7 are incorrect, should be W/mm^2-K
> row 12 is nonsensical, because you used mm^2 as the area unit. The temperature for conduction is the delta temperature, not the absolute. Absolute temperature only shows up in radiated heat and heat transfer coefficient calculations.
> mm^2 for area is a nonsensical
> row 16 is nonsensical, since that's per mm^2 of area.

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Your living room and outside environment is filled with air, which is a gas. Therefore, you should consider convection.

You have an HVAC problem here. There are a lot of HVAC knowledge in books, for example ASHRAE Handbook, that can aid you in solving your problems.

If you want a glass wall then choose glass.

If you want a concrete wall then choose concrete.

Design the HVAC accordingly.

@MintJulip - best advise!
@vij36: text book suff - heat transfer has 3 elements, conduction, convection and radiation. Each element has constant for specific maerials that are easy to find. If you are really considering building a room, then for HVAC design you will be able to find table/graphs that will tell you the amount of heat influx based on temperature difference. The tables etc ha solved the problem for you in a standard way that will be valid for most cases.

Best regards, Morten

Here is a third option. Instead of concrete or glass panes, consider glass blocks, then contact the manufacturer for the K or R value. For regular glass panes, concrete blocks or plain concrete walls CE or ME handbooks will have those values.

Aren't glass blocks a bit 1960s?

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Quote (MortenA)

text book suff - heat transfer has 3 elements, conduction, convection and radiation. ...

my doubt is whether it is glass or brick wall the surrounding media such as air remains the same. Or if I am wrong will the surrounding area's medium such as air will have separate effects on glass and brick ?

You need to explain the problem, in MORE DETAIL, rather than just tossing out random disjoint questions.

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Quote (IRStuff)

You need to explain the problem, in MORE DETAIL, rather than just tossing out random disjoint questions.

Apologize for the inconvenience.

Am relatively new to hvac material selection.

Basically the task in my hand is to choose between 10 mm glass or porotherm brick.

Glass U value is ranging from 1.67 to 5.88. W/ m k
Link

Porotherm thermobrick U value is 0.6 W/ m k
Link

So for less heat gain inside should we need to choose less U vale material ?

Spare me if I am awfully wrong .

That's pretty clear from the units, isn't it? Something that conducts less power per degreeC temperature difference must be insulating better.

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Quote (IRStuff)

Aren't glass blocks a bit 1960s?

Are the double glazing units are better than glass blocks ? Will the spacer can improve the hvac performance ?

Glass blocks are thick, so should be less conductive than double pane, but double pane is more modern and you can see through it. This is all pretty common knowledge.

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Double pane windows with warm edge spacer a) basically eliminate thermal bridging from the inside to the outside (i.e. there is NO CONDUCTION to speak of) and also minimize convection by reducing the space between the glass sheets to the optimum (the spacing that results in the lowest heat transfer from one glass sheet to the other) and, generally, filling that space between the glass sheets with another gas (argon) to further reduce convection. They usually also add a low emissivity coating to reduce radiant heat transfer.

In typical building construction for a cold climate, glazing (windows and doors) represent a greatly higher rate of heat loss than properly constructed walls. But we're not talking about bare concrete extending from the outside to the inside of the structure in that case- there's an insulating material designed into the wall somewhere.

Dear All,

This website says awnings are effective to block only 50% of solar radiation (location specific) south facing. Any calculations exists.

Link

Per IRstuff "Aren't glass blocks a bit 1960s?" nothing is wrong with the 1960's appearance but one thing that glass bocks offer is better security than glass panes and I have seen several structures over the years with glass block walls and even now.