GMW GMW16767 PDF

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose. The purpose of this analysis procedure is to provide an analytical method for determining the performance attributes of a Heating, Ventilation and Air Conditioning (HVAC) system. 

Foreword. This test procedure should be used to evaluate an HVAC system's sensitivity to its Bill of Material (BOM) components as well as to vehicle specific attributes. Historically, air conditioning components were selected based on a steady state operation in fresh air mode. This was done to both minimize the assumptions required to perform the analysis and reduce the variation inherent to transient analysis. Similarly, this procedure uses steady state points to select components for the HVAC system for the same reason. 

Applicability. This procedure is applicable for both single evaporator and dual evaporator air conditioning systems used in passenger vehicles. A single evaporator and chiller system can also use this procedure by simply exchanging the rear evaporator for a chiller. Usage of an Internal Heat Exchanger (IHX) involves pressure drop and capacity balance, and is a tuning element beyond the scope of this sizing activity.