hvac boundry conditions

vinerm · March 17, 2020, 05:13

By surroundings of the room, I suppose you mean the flow and thermal field within the room. In literal sense, surroundings of the room mean everything outside the room and not inside.

This is scenario 1 and my recommendation would be to follow the approach outlined for this scenario in my previous post.

mtalha976 · March 18, 2020, 05:39

vinerm,
i Want to ask in outlet conditions what i have to enter the backflow temperature?
and second Ambient temperature is enough or heat flux should be given also at the walls of empty room?

vinerm · March 18, 2020, 05:55

At outlet you can specify 300. This number matters only if there is any flow reversal. Otherwise, this is not important. On the walls, you can use surrounding temperature or convection condition with surrounding temperature and 5-10 as convection coefficient, assuming outside the room there is no strong wind flow.

mtalha976 · March 18, 2020, 07:20

Thank you Vinerm.
How can i change the material of wall from aluminum to Solid bricks. It does not have any option available for that.

vinerm · March 18, 2020, 07:25

That material is not important until and unless you provide some thickness for the wall. If you want to model the wall thickness, then you have to create a material under Materials > Solid or modify the properties of Aluminum to those of brick and mortar.

mtalha976 · March 18, 2020, 08:22

Do i have too provide any material to AC WALLS? because it is also treating as aluminium?

vinerm · March 18, 2020, 12:08

Materials for the walls are not relevant until and unless some thickness is provided. You can neglect these.

March 17, 2020, 05:13	Objective	#21
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	By surroundings of the room, I suppose you mean the flow and thermal field within the room. In literal sense, surroundings of the room mean everything outside the room and not inside. This is scenario 1 and my recommendation would be to follow the approach outlined for this scenario in my previous post. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

March 18, 2020, 05:55	Boundary Condition	#23
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	At outlet you can specify 300. This number matters only if there is any flow reversal. Otherwise, this is not important. On the walls, you can use surrounding temperature or convection condition with surrounding temperature and 5-10 as convection coefficient, assuming outside the room there is no strong wind flow. mtalha976 likes this. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

March 18, 2020, 07:25	Wall Material	#25
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	That material is not important until and unless you provide some thickness for the wall. If you want to model the wall thickness, then you have to create a material under Materials > Solid or modify the properties of Aluminum to those of brick and mortar. mtalha976 likes this. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

March 18, 2020, 12:08	Wall Material	#27
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	Materials for the walls are not relevant until and unless some thickness is provided. You can neglect these. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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March 18, 2020, 05:39		#22
mtalha976 Member Muhammad Talha Join Date: Feb 2020 Posts: 32 Rep Power: 6	vinerm, i Want to ask in outlet conditions what i have to enter the backflow temperature? and second Ambient temperature is enough or heat flux should be given also at the walls of empty room?

March 18, 2020, 07:20		#24
mtalha976 Member Muhammad Talha Join Date: Feb 2020 Posts: 32 Rep Power: 6	Thank you Vinerm. How can i change the material of wall from aluminum to Solid bricks. It does not have any option available for that.

March 18, 2020, 08:22		#26
mtalha976 Member Muhammad Talha Join Date: Feb 2020 Posts: 32 Rep Power: 6	Do i have too provide any material to AC WALLS? because it is also treating as aluminium?