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Field Validation of the ASHRAI Transfer Function Method for Calculating Cooling Load
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Date
1988
Authors
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Journal ISSN
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Publisher
Energy Systems Laboratory (http://esl.tamu.edu)
Texas A&M University (http://www.tamu.edu)
Texas A&M University (http://www.tamu.edu)
Abstract
The American Society of Heating, Refrigerating
and Air Conditioning Engineers (ASHRAE) Transfer
Function Method (TFM) was validated using two
identical wood frame residential-type structures,
each containing an east and west-facing room. Each
room had a calibrated, thermostatically controlled
window air conditioning unit and two south-facing
windows. The study included a parametric analysis
of the thermostat setpoint and fenestration load
effect on space heat extraction rate and cooling
energy consumption. Some discrepancies
withstanding, the transfer function method predicted
the hourly heat extraction rates quite well. The
principal discrepancies appeared to be the
difference in daily curve amplitude and a phase-like
shift of one to two hours. The heat storage
capacity of the unoccupied test buildings was less
than predicted by the TFM model. Accuracy of the
transfer function coefficients to model the
roof-ceiling combination was questionable due to the
small attic air space which was not accurately
described in the ASHRAE table of coefficients.