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I have a naturally ventilated office and am using the
Sherman Grimsrud method. Even when I specify a Vent Area Fraction of 0.01 and
a max ACH of 0.01 still get enough air flow such that during the hottest hour
of the year in Seattle which is 98°F, the inside temperature only peaks at 99°F
which is impossible since there is considerable amounts of glass and internal
heat gain. With these inputs there should be no ventilation and I should be
getting extremely hot temperatures. Then again, looking at the summer design day which is
specified as a 82°F and 18°F range and the indoor conditions are shown below. Why
is the design day which has a relative low max temperature predicting so much
hotter indoor temperatures that make sense compared to those from the annual simulation.
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