I wonder why the heating and cooling load change as window location

I have a question regarding the heating load of a building

I know that heat transmittance, thickness, area, and temperature difference are required to calculate the heat gain and loss of a building.
If so, shouldn’t the cooling and heating loads be the same when the window position changes as shown in the picture below?

Hi @imj06050215,

The main thing I can think of here is that the solar radiation through the window would fall differently on the internal surfaces, E.g for the opening higher up the space a larger quantity of solar gain would hit the walls rather than the floor.

The walls and floor having different solar absorptance, thermal mass, and boundary conditions could then result in the heat balance changing marginally and result in the minor change in cooling energy you’re showing.

There could be other factors involved I’ve overlooked.

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