question in Building Construction Illustrated

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lotus0418

February 03, 2021 01:03

Hi Guys, I'm studying Building Construction Illustrated and cannot understand a sentence in page 11.04. The sentence is "The higher the MRT of the surrounding surfaces, the cooler the air temperature should be". I don't know why. I hope some one can tell me the reason. Many thanks in advance!

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  Ryan Gallegos February 03, 2021 06:32

  I will say, the higher the temperature of the surfaces in the space require the air temperature to be cooler to have an overall comfortable space. Balancing the MRT with the air temperature.

  MRT = Mean Radiant Temperature.

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  rebekkak February 04, 2021 14:36

  So the MRT = mean radiant temperature.  If air conditioning hasn't been used and the outside air is 90°, eventually the building and everything inside it will be 90°.  All the furnishings (desks, chairs, books, floorings, EVERYTHING) inside the building will be 90°.  Once everything has heated up to that extent, the furnishings are radiating heat into the space as you are trying to cool the air.  It takes a long time for the a/c to cool it down 70° let's say.  So it makes sense to say that setting the a/c to 60° would cool the furnishings (and the air) faster than setting it 70°. 

  Hope that helps. 

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  lotus0418 February 07, 2021 23:27

  Hi Ryan,

  Thanks for your answers.

  Hi Rebekka,

  I cannot understand what's the example's meaning and relationship with my question. Sorry!

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