BASICS OF AIR MANUALS & SOFTWARE
Basics of Air Manual
This manual was designed for use with TECA's Quality First™ Basics of Air course.
After years of offering training for airside heating, cooling and ventilation contractors, it became very clear to the association that the basic properties of air and how to move it effectively and efficiently are not well understood.
High efficiency gas furnaces circulate twice the volume of air as older, 70°–90°F temperature rise equipment. Also, for the same output, high efficiency heat pumps circulate three times more air than these older gas furnaces. Yet the higher circulation demands of this efficient equipment is not necessarily being accommodated with adequate duct system design.
This is problem further compounded by the fact that designing adequate systems runs at odds with the shrinking space of modern mechanical rooms (no drop ceilings permitted) and flush beam framing in dwellings.
For the last 40 years, we have limped along by consuming cheap electricity and installing forgiving (low cfm, high temperature rise) heating equipment. Further, with the trend to air conditioning-ready furnaces with more powerful motors/blower and induced draft fans, sound levels have risen and the reputation of forced air heating as a quality choice has suffered.
With Basics of Air, TECA presents knowledge lost by most industry practitioners since the demise of gravity air heating systems. The material in this manual explains how to efficiently and quietly move high volumes of air required by modern HVAC equipment. It explains terms like duct velocity, air flow rate, duct aspect ratio, and pressures. Basics of Air also discusses the power requirements (transport energy) of pushing and pulling air through duct systems and presents fan laws and other useful tools for sizing and installing duct fittings and systems. It also teaches how to measure pressures and cfm's All this . information and the associated skills are required to design free flowing duct systems.
Basics of Air uses plain language, practical math and a fully instrumented one-tenth size scale model of a forced air furnace to demonstrate important air handling principals.
This training course and manual provide the HVAC designer and installer with convincing reasons, to size duct adequately and to sell to the consumer and related construction industry members the higher cost of making proper fittings and making available the space required to install them.
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DISCLAIMER: This Manual was developed in consultation with, and using information obtained from manufacturers, suppliers, contractors and others with specialized experience. It is subject to revision as further use and investigation may show such revision necessary or desirable. Installations and designs that comply with this manual will not necessarily be acceptable if, when examined and tested, they are found to have features that impair the result contemplated by these requirements. The authors and editors assume no responsibility and accept no liability for the application of the principles or techniques contained in this manual or for errors or omissions and expressly disclaim any such responsibility.