TY - JOUR
AU - Iain S Walker
AU - David J Wilson
AB - Explicit algebraic equations for calculation of wind and stack driven ventilation were developed by  parametrically matching exact solutions to the flow equations for building envelopes.  These separate wind  and stack effect flow calculation procedures were incorporated in a simple natural ventilation model, AIM- 2, with empirical functions for superposition of wind and stack effect and for estimating wind shelter.  The  major improvements over previous simplified ventilation calculations are: a power law pressure-flow  relationship is used to develop the flow equations form first principles, the furnace or fireplace flue is  included as a separate leakage site and the model differentiates between houses with basements (or slab-on- grade) and crawlspaces.  Over 3400 hours of measured ventilation rates from the test houses at the Alberta  Home Heating Research Facility were used to validate the predictions of ventilation rates and to compare  the AIM-2 predictions to those of other ventilation models.  The AIM-2 model had bias and scatter errors  of less than 15% for wind-dominated ventilation, and less than 7% for buoyancy ("stack-effect") dominated  cases.
BT - HVAC&R Research
C1 - 2.3
C2 - LBNL-42361
LA - eng
N2 - Explicit algebraic equations for calculation of wind and stack driven ventilation were developed by  parametrically matching exact solutions to the flow equations for building envelopes.  These separate wind  and stack effect flow calculation procedures were incorporated in a simple natural ventilation model, AIM- 2, with empirical functions for superposition of wind and stack effect and for estimating wind shelter.  The  major improvements over previous simplified ventilation calculations are: a power law pressure-flow  relationship is used to develop the flow equations form first principles, the furnace or fireplace flue is  included as a separate leakage site and the model differentiates between houses with basements (or slab-on- grade) and crawlspaces.  Over 3400 hours of measured ventilation rates from the test houses at the Alberta  Home Heating Research Facility were used to validate the predictions of ventilation rates and to compare  the AIM-2 predictions to those of other ventilation models.  The AIM-2 model had bias and scatter errors  of less than 15% for wind-dominated ventilation, and less than 7% for buoyancy ("stack-effect") dominated  cases.
PY - 1998
SP - 119
EP - 139
T2 - HVAC&R Research
TI - Field Validation of Algebraic Equations for Stack and Wind Driven Air Infiltration Calculations
VL - 4
ER -