Two specific areas are addressed: (1) The necessity for effective estimates of infiltration rates in buildings; and (2) The dependence of vapor compression air conditioning systems on refrigerant charge. It is shown that the estimate of air infiltration rates through simple tests such as "blower-tests" are not applicable. In addition, there may be measurable drops in the capacity of air conditioning systems (on the order of up to 10%) for noni significant variations in the refrigerant charge from the optimum value.
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