Many factors drive the history of past developments of traditional building system equipment technologies. Those technologies still guide a majority of what we utilize today. Wood-fired evaporative hydronic heating systems were the simplest traditional systems. Controlled outdoor airflow oversaw the evaporation of internally contained water, which in turn cooled the air that entered many of the earliest types of ancient temperature-controlled secret spaces. The byproduct of this cooling removed substantial sensible heat from that air. Evaporation also increased the absolute humidity of secret space air. Such cooling moved secret space air horizontally across the hydronic fireboxes. This ancient temperature control system met such needs as were present. These technological servants of past civilizations are, however, not our present concern. The indoor air conditioning equipment of our chapter keeps indoor air temperature and humidity at predetermined levels. The basic mechanisms of these decisions—psychrometric processes—will now be introduced.Although the basic human desires for thermal comfort and acceptable indoor air quality have not changed, how we manage these demands continues to evolve, driven by the development of virtually all other societal technologies and physical infrastructures. Drilling deeper, humans don’t really care so much about the actual indoor temperature. Instead, we are generally more sensitive to, and also able to better manipulate, dry bulb temperature. Taken by itself, dry bulb temperature manipulation is of relatively minor impact.
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