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ASHRAE , 2022
Publisher: ASHRAE
File Format: PDF
$8.00$16.00
To ensure HVAC equipment meets space conditioning loads during peak conditions, systems that serve those loads are significantly oversized. In fact, the Air Conditioning Contractors of America (ACCA) guidelines in Manual S recommend equipment be sized 15% to 40% greater than the expected peak loads depending on equipment type. Therefore, HVAC equipment capacities are typically much larger than the loads they serve most of the time. As such, they operate at low part-loads (the ratio of space conditioning load to equipment capacity). When systems serve part-load conditions, cycling and other factors negatively impact performance; typically, the lower the part-load, the shorter the heating cycles, and the lower the efficiency. Systems that operate efficiently at low part-load conditions improve comfort and cost-effectiveness. Therefore, it is imperative the industry understands how well systems perform in part-load conditions.
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