PPD Demo Question



  • Avatar
    Michael Ermann

    This is from a diagram in the book, Sun Wind and Light, that suggests architects locate buildings on a hilltop in hot humid climates for access to cross ventilation; 3/4 of the way up in mixed (temperate) climates (some cross ventilation breezes in summer but not too much heat-sapping wind in winter); 1/3 of the way up in cold climates for protection from wind; and (counterintuitively) at the bottom of the hill in hot-arid climates because cool air pools in the valleys at night…You are right about the confusing answer explanation: the volunteer who wrote this question seems to not know that being on the top of the hill doesn’t really allow the hill to protect you from the sun and certainly not too much of the west sun, And the question never specifies that the hill is south facing, so that was a goof (but the diagram in the book does)…..worth noting for your practice (NCARB volunteers don’t seem to know this) that (1) cool air in hot arid climates air only pools at the bottom of the valley on still nights with no breeze, and only then in steep narrow valleys, and (2) both the wind and shade issues and opportunities are complicated once you add trees to the hill…and the volunteer test writers did get right that, like so much of that book, and passive heating and cooling all over these exams, this rule only applies to very small buildings like single family houses (and only then to houses whose occupants, in perpetuity, will open the windows when most people rely on air conditioning),

    Michael Ermann, Amber Book creator

    Comment actions Permalink
  • Avatar
    Talia Li

    Thank you for your detailed answer!

    Comment actions Permalink

Please sign in to leave a comment.

Powered by Zendesk